Peeling force testing device

Abstract

The utility model belongs to the technical field of battery stripping force testing, and mainly relates to a stripping force testing device which comprises a tensile machine for stripping a substrate layer and a stripping layer of a pole piece and a base for bearing the substrate layer, the upper tensile machine comprises a locking part and an adjusting screw rod for adjusting the locking width of the locking part; a guide rail is arranged at the top of the lower tensile machine, the base is movably arranged on the guide rail, and the extending direction of the guide rail is perpendicular to the height direction of the lower tensile machine. A guide plate is arranged on one side of the base, a fixing screw and an adjusting screw are arranged on the guide plate, the two sides of the fixing screw are of straight structures, and the stripping layer is attached to the two sides of the fixing screw in the stripping process; therefore, the technical defect that in the stripping process of the stripping layer by an existing stripping force testing device, the testing consistency is influenced by slight difference of stripping angles, so that the stripping force data deviation is large is overcome.

Description

Technical Field

[0001] This utility model belongs to the field of battery peel force testing technology, and specifically relates to a peel force testing device. Background Technology

[0002] Battery electrode peel force testing is an important method for evaluating the performance of adhesives and the structural integrity of battery electrodes during battery manufacturing. Battery electrodes typically consist of positive and negative electrode materials coated on a metal substrate, and in most cases, also contain a layer of adhesive for bonding. Peel force testing involves applying external force to separate the test material or the material from the substrate, measuring the force required for peeling, and thus evaluating the bonding performance.

[0003] A common peel strength test involves significantly bending one of the bonded or adhesive materials and applying external force to obtain the peel value. Currently, commonly used battery electrode peel force testing methods mainly include 90° and 180° bending peel tests. These methods typically use specific fixtures to fix the electrode and apply bending force. However, during the pulling process, the adhesive material may experience uneven stress, leading to jerking and momentary fluctuations in peel force. This inconsistent movement directly affects test accuracy and may distort the results. Furthermore, existing methods use round screws to support the electrode, but due to their shape limitations, it's impossible to guarantee that the angle remains precisely 90° throughout the peeling process. Even slight differences in this angle can affect test consistency, resulting in significant deviations in peel force data.

[0004] Therefore, it is urgent to improve the existing battery electrode peel force testing device to solve the defects of the aforementioned technology. Utility Model Content

[0005] The purpose of this utility model is to provide a peel force testing device for battery electrodes to address the shortcomings of existing technologies and solve the technical defect of large deviations in peel force data in existing peel force testing devices.

[0006] To achieve the above-mentioned objectives, this application implements the following technical solution:

[0007] A peel force testing device includes a tensile testing machine for peeling a substrate layer and a peeling layer from an electrode sheet, and a base for receiving the substrate layer. The tensile testing machine includes an upper tensile testing machine and a lower tensile testing machine. The upper tensile testing machine includes a locking part and an adjusting screw for adjusting the locking width of the locking part. A guide rail is provided on the top of the lower tensile testing machine, and the base is movably mounted on the guide rail. The extension direction of the guide rail is perpendicular to the height direction of the lower tensile testing machine. A guide plate is provided on one side of the base. The guide plate is provided with a fixing screw and an adjusting screw. The two sides of the fixing screw have a flat structure, and the peeling layer adheres to the two sides of the fixing screw during the peeling process.

[0008] The above technical solution produces the following technical effects:

[0009] This application's device employs a fixed screw design with flat structures on both sides. During the peeling process, the flat structures guide the electrode, ensuring the stability of the peeling angle. This effectively solves the problem of slight angle variations caused by the screw shape, improving the consistency and accuracy of the test. Furthermore, this application is equipped with an adjustable base and guide plate, which effectively reduces stress changes in the material during pulling, allowing the material to move more smoothly and eliminating jamming, thereby improving the stability of the test and the reliability of the results.

[0010] As a further improvement to the peel force testing device of this application, the adjusting screw is used to press the base layer and the width between the adjusting screw and the base is D1.

[0011] As a further improvement to the peel force testing device of this application, the width value D1 between the adjusting screw and the base satisfies 1cm≤D1≤2cm.

[0012] As a further improvement to the peel force testing device of this application, the fixing screw is provided with a bent part and a straight part, and there are two straight parts;

[0013] During the peeling process, the peeling layer moves along the surface of the straight section, and the bent section is used to connect the two bent sections.

[0014] As a further improvement to the peel force testing device of this application, the guide plate is provided with a first through groove and a second through groove;

[0015] The first through slot is used to receive the fixing screw, and the second through slot is used to receive the adjusting screw;

[0016] The height of the second through slot is greater than the height of the adjusting screw, and the adjusting screw can move along the thickness direction of the base within the second through slot.

[0017] As a further improvement to the peel force testing device of this application, the upper tensile testing machine is provided with a slot, and a first clamping piece is fixedly connected to one side of the slot;

[0018] A second clamping piece is also provided in the slot. The second clamping piece and the first clamping piece are used to clamp the peeling layer. The end of the second clamping piece away from the peeling layer is fixedly connected to the adjusting screw.

[0019] As a further improvement to the peel force testing device of this application, the upper tensile testing machine is provided with a first through hole, which is used for the adjustment screw to pass through and be installed in the slot.

[0020] As a further improvement to the peel force testing device of this application, at least two balance blocks are provided at the bottom of the guide rail.

[0021] As a further improvement to the peel force testing device of this application, the extension direction of the balance block is perpendicular to the extension direction of the guide rail.

[0022] As a further improvement to the peel force testing device of this application, both the upper tensile tester and the lower tensile tester are high-speed rail magnetic tensile testers. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention. In the drawings:

[0024] Figure 1 This is a schematic diagram of the existing electrode peeling force testing device according to Embodiment 1 of this utility model;

[0025] Figure 2 This is a schematic diagram of the peel force testing device of this application in Embodiment 1 of the present invention;

[0026] Figure 3 This is a front view of the peel force testing device of this application in Embodiment 1 of the present invention;

[0027] Figure 4 This is a schematic diagram of the tensile testing machine in the peel force testing device of this application in Embodiment 2 of this utility model;

[0028] Figure 5 In this utility model Figure 3 A magnified view of a portion at point A;

[0029] in:

[0030] 1'- Pull-up machine;

[0031] 2'-Round screw;

[0032] 3'-Base 3';

[0033] 4' - Pull-down machine 4';

[0034] 1-Electrode;

[0035] 11-Basal layer;

[0036] 12-Peeling layer;

[0037] 2-Tension testing machine;

[0038] 21-Use a tensile testing machine;

[0039] 211-Locking part;

[0040] 212 - Adjusting screw;

[0041] 213 - Slot;

[0042] 2131 - First clip;

[0043] 2132 - Second clip;

[0044] 22-Tightness testing machine;

[0045] 221-Guide rail;

[0046] 2211-Balance Block;

[0047] 3-Base;

[0048] 31-Guide plate;

[0049] 311 - Fixing screw;

[0050] 3111 - Bending section;

[0051] 3112 - Straight section;

[0052] 312 - Adjusting screw;

[0053] 313 - First through slot;

[0054] 314 - Second through slot. Detailed Implementation

[0055] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terminology used in the specification of this application is only for describing specific embodiments and is not intended to limit this application.

[0056] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0057] Although this application discloses preferred embodiments as described above, it is not intended to limit the claims. Any person skilled in the art can make several possible changes and modifications without departing from the concept of this application. Therefore, the scope of protection of this application should be determined by the scope defined in the claims of this application.

[0058] The present invention will be further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0059] Implementation Method 1

[0060] like Figure 1 As shown in the cross-sectional view of the existing battery electrode 1 peel force testing device, the current method for testing the peel force of the battery electrode 1 involves driving a pull-up machine 1' to pull the electrode 1 vertically. Under the action of the circular screw 2', the worktable can move at least horizontally away from the base, thus allowing the peeling layer 12 to maintain movement perpendicular to the base layer 11, and the angle between the peeling layer 12 and the base layer 11 to be maintained at 90°. However, the applicant of this application has found that the shape of the circular screw cannot completely maintain the peeling layer 12 at a 90° angle during testing. In practice, the pull-up machine 1' usually causes the peeling layer 12 to peel off from the surface of the base layer 11 at an angle slightly higher than 90°. This slight difference in angle affects the consistency of the peel force test, ultimately affecting the final test value of the peel force, thereby seriously affecting the evaluation of the adhesion performance of the battery electrode 1.

[0061] Based on this, such as Figure 2-3 As shown, this application improves upon the existing peel force testing device for battery electrode 1. Specifically, the peel force testing device for battery electrode 1 in this application includes a tensile testing machine 2 for peeling the base layer 11 and the peeling layer 12 of the electrode 1, and a base 3 for supporting the base layer 11. The tensile testing machine 2 includes an upper tensile testing machine 21 and a lower tensile testing machine 22. The upper tensile testing machine 21 includes a locking part 211 and an adjusting screw 212 for adjusting the locking width of the locking part 211. A guide plate 31 is provided on one side of the base 3. The guide plate 31 is provided with a fixing screw 311 and an adjusting screw 312. The two sides of the fixing screw 311 are flat structures. During the peeling process, the peeling layer 12 is attached to the two sides of the fixing screw 311. The electrode 1 is guided by the flat structure during the peeling process to ensure the stability of the peeling angle.

[0062] In specific implementation, the operation method of the device in this application is as follows: Figure 3As shown. At the start of the peel test, firstly, the base layer 11 of the battery electrode 1 is placed on the base 3 and tightened and fixed using the adjusting screw 312. At this time, the width between the adjusting screw 312 and the base 3 is set within a satisfactory range to ensure the stability of the base layer 11 during the test. Subsequently, the peel layer 12 is clamped by the locking part 211 of the upper tensile testing machine 21. The width of the locking part 211 can be adjusted using the adjusting screw 212 to accommodate peel layers 12 of different sizes.

[0063] It is worth noting that during the test, the upper tensile testing machine 21 starts and applies an upward pulling force to the peeling layer 12, achieved through the locking part 211. Simultaneously, the lower tensile testing machine 22 remains stable or works in conjunction with the upper tensile testing machine 21, applying a downward reaction force to stretch the base layer 11. Under the action of the pulling force, the peeling layer 12 begins to peel off from the base layer 11, guided by the straight portion 3112 of the fixing screw 311 on the guide plate 31. The straight structure of the fixing screw 311 ensures that the peeling layer 12 maintains a stable 90° peeling angle during the peeling process, thereby improving the accuracy and consistency of the test.

[0064] Furthermore, the fixing screw 311 is provided with a bent portion 3111 and a straight portion 3112, with two straight portions 3112. During the peeling process, the peeling layer 12 moves along the surface of the straight portion 3112, and the bent portion 3111 connects the two bent portions 3111. As the peeling process proceeds, the peeling layer 12 moves smoothly along the straight portion 3112 of the fixing screw 311, avoiding jamming caused by uneven stress. Simultaneously, the adjusting screw 312 can move along the thickness direction of the base 3 within the second through groove 314 (i.e., as shown in the image). Figure 3 Fine-tuning (in the two directions shown) is performed to accommodate substrate layers 11 of different thicknesses, further improving the flexibility of testing.

[0065] Finally, the test ends when the tensile testing machine 21 completely peels the release layer 12 from the substrate layer 11. At this point, the force required during the peeling process can be measured using relevant measuring equipment to evaluate the adhesion performance of the battery electrode 1.

[0066] Furthermore, a guide rail 211 is provided on the top of the pull-down machine 22, and the base 3 is movably mounted on the guide rail 211. The extension direction of the guide rail 211 (e.g., Figure 3 The left and right directions shown are perpendicular to the height direction of the tensile testing machine 22. Therefore, the base 3 can move stably in the vertical direction along the guide rail 211, ensuring that the relative position between the peeling layer 12 and the base layer 11 remains unchanged during the test, further improving the accuracy of the test.

[0067] Furthermore, at least two balance blocks 2211 are provided at the bottom of the guide rail 211, which not only enhances the stability of the guide rail 211, but also effectively prevents deviations caused by vibration or external force interference during testing. The extension direction of the balance blocks 2211 is perpendicular to the extension direction of the guide rail 211. This design allows the balance blocks 2211 to better support and stabilize the guide rail 211, maintaining excellent stability even under high-speed or high-load testing conditions.

[0068] Implementation Method 2

[0069] like Figure 1-4 As shown, unlike the embodiment, in order to further improve the accuracy of the peel force testing device for the battery electrode 1 of this application, the adjusting screw 312 is further used to press the substrate layer 11, and the width between the adjusting screw 312 and the base 3 is D1. Thus, the adjusting screw 312 can not only press and fix the substrate layer 11, but also the width value D1 between it and the base 3 is precisely controlled within a certain range.

[0070] In the specific implementation process, the width D1 between the adjusting screw 312 and the base 3 satisfies 1cm ≤ D1 ≤ 2cm. This design ensures that the substrate layer 11 is subjected to uniform and stable pressure during the test, thereby further improving the accuracy and reliability of the peel force test. In the specific implementation process, the position of the adjusting screw 312 can be finely adjusted according to actual needs to achieve precise control of the pressing degree of the substrate layer 11. This improvement enables the peel force testing device of this application to more accurately simulate the stress situation of the battery electrode 1 in actual use, providing more accurate data support for the evaluation of the adhesion performance of the battery electrode 1.

[0071] Other aspects that are the same as in Implementation Method 1 will not be described again in this implementation method.

[0072] Implementation Method 3

[0073] like Figure 1-5 As shown, unlike Embodiment 1, in order to further improve the fixation of the battery electrode 1 substrate layer 11 by the peel force testing device of this application, so that the electrode 1 will not experience large fluctuations in the peel force testing process due to the adhesive pulling between the substrate layer 11 and the peel layer 12, thereby affecting the performance evaluation of the corresponding battery electrode 1, the guide plate 31 of the peel force testing device of this application is provided with a first through groove 313 and a second through groove 314; the first through groove 313 is used to receive the fixing screw 311, and the second through groove 314 is used to receive the adjusting screw 312; the height of the second through groove 314 is greater than the height of the adjusting screw 312, and the adjusting screw 312 can move along the thickness direction of the base 3 within the second through groove 314.

[0074] Furthermore, the first through slot 313 and the second through slot 314 allow for precise adjustment of the positions of the fixing screw 311 and the adjusting screw 312. In practice, the fixing screw 311 is stably fixed to the guide plate 31 via the first through slot 313. The straight structure of the fixing screw 311 effectively guides the peeling layer 12, ensuring the stability of the peeling angle. Simultaneously, the adjusting screw 312 has a certain degree of freedom of movement within the second through slot 314, allowing for fine-tuning along the thickness direction of the base 3. This design not only ensures that the base layer 11 is firmly pressed onto the base 3 but also accommodates base layers 11 of varying thicknesses, further improving the flexibility and accuracy of the test.

[0075] Furthermore, the tensile testing machine 21 is provided with a slot 213, on one side of which a first clamping piece 2131 is fixedly connected, and a second clamping piece 2132 is also provided within the slot 213. The first clamping piece 2131 and the second clamping piece 2132 cooperate with each other to clamp the peeling layer 12. It is worth noting that the end of the second clamping piece 2132 away from the peeling layer 12 is fixedly connected to the adjusting screw 212. Therefore, by adjusting the position of the adjusting screw 212, precise control of the clamping force on the peeling layer 12 can be achieved. This design ensures that the peeling layer 12 remains stable during testing, avoiding testing errors caused by improper clamping.

[0076] Furthermore, the upper tensioning machine 21 is provided with a first through hole, which is used for the adjusting screw 212 to pass through and be disposed in the slot 213.

[0077] Furthermore, both the upper tensile testing machine 21 and the lower tensile testing machine 22 are high-speed magnetic tensile testing machines 2. The beneficial effects of the peel force testing device of this application also include: providing a peel force testing device for battery electrode 1 without replacing the high-speed magnetic tensile testing machine 2. The principle is that existing battery electrode 1 peel force testing fixtures typically require the use of a dedicated tensile testing machine 2, and different specifications of battery electrode 1 may require different models of tensile testing machines 2, which undoubtedly increases the cost and complexity of the test. This application, by adopting a high-speed magnetic tensile testing machine 2, not only has higher tensile stability and accuracy, but also can adapt to the testing needs of various specifications of battery electrode 1, reducing testing costs and improving the versatility and flexibility of the test.

[0078] Other aspects that are the same as in Implementation Method 1 will not be described again in this implementation method.

[0079] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A peel force testing apparatus comprising a tensile testing machine (2) for peeling a base layer (11) and a peel layer (12) of a tab (1) and a holder (3) for receiving the base layer (11), characterized in that The tension machine (2) comprises an upper tension machine (21) and a lower tension machine (22), the upper tension machine (21) comprises a locking part (211) and an adjusting screw (212) for adjusting the locking width of the locking part (211); The top of the lower tension machine (22) is provided with a guide rail (221), and the base (3) is movably arranged on the guide rail (221), and the extension direction of the guide rail (221) is perpendicular to the height direction of the lower tension machine (22); One side of the base (3) is provided with a guide plate (31), the guide plate (31) is provided with a fixing screw (311) and an adjusting screw (312), the two sides of the fixing screw (311) are flat structures, and the stripping layer (12) is attached to the two sides of the fixing screw (311) during stripping.

2. A peel force testing device according to claim 1, wherein, The adjusting screw (312) is used for pressing the base layer (11), and the width value between the adjusting screw (312) and the base (3) is D1.

3. A peel force testing device according to claim 2, wherein, The width value between the adjusting screw (312) and the base (3) is D1, which satisfies 1cm≤D1≤2cm.

4. The peel force testing apparatus of claim 1, wherein, The fixing screw (311) is provided with a bending part (3111) and a flat part (3112), and the flat part (3112) is provided with two; The stripping layer (12) moves on the surface of the flat part (3112) during stripping, and the bending part (3111) is used for connecting two bending parts (3111).

5. The peel force testing apparatus of claim 1, wherein, The guide plate (31) is provided with a first through groove (313) and a second through groove (314); The first through groove (313) is used for accommodating the fixing screw (311), and the second through groove (314) is used for accommodating the adjusting screw (312); The height value of the second through groove (314) is greater than the height value of the adjusting screw (312), and the adjusting screw (312) can move along the thickness direction of the base (3) in the second through groove (314).

6. The peel force testing apparatus of claim 1, wherein The upper tension machine (21) is provided with a slot (213), and one side of the slot (213) is fixedly connected with a first clamping piece (2131); The slot (213) is also provided with a second clamping piece (2132), the second clamping piece (2132) and the first clamping piece (2131) are used for clamping the stripping layer (12), and one end of the second clamping piece (2132) away from the stripping layer (12) is fixedly connected with the adjusting screw (212).

7. A peel force testing device according to claim 6, wherein, The upper tension machine (21) is provided with a first through hole, and the first through hole is used for penetrating the adjusting screw (212) and being arranged in the slot (213).

8. The peel force testing apparatus of claim 1, wherein, The bottom of the guide rail (221) is provided with at least two balance blocks (2211).

9. A peel force testing device according to claim 8, wherein, The extension direction of the balance block (2211) is perpendicular to the extension direction of the guide rail (221).

10. The peel force testing apparatus of claim 1, wherein, The upper tension machine (21) and the lower tension machine (22) are both high ferromagnetic tension machines.

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