Device for testing cohesion of pole piece

Abstract

The utility model relates to a pole piece cohesion testing device. The testing device comprises a base body and a lifting assembly. And the base body is provided with a fixing position for fixing the pole piece. The lifting assembly is arranged on the base body in a lifting mode and located over the fixing position, the lifting assembly comprises a lifting head capable of lifting and a plate body capable of lifting along with the lifting head, and the plate body can be fixed to a coating material on the pole piece; and the lifting head applies pulling force to the coating material through the plate body in the lifting process. The testing device can more directly and accurately measure the cohesion of the pole piece.

Description

Technical Field

[0001] This application relates to the field of testing technology, and more specifically, to a testing device for electrode cohesion. Background Technology

[0002] Cohesion refers to the adhesive force between the layers of material in an electrode. The magnitude of cohesion directly affects the cycle life and safety performance of the battery. If the cohesion cannot meet the battery's requirements, the electrode material will detach during battery use, causing a sharp reduction in lifespan or even safety issues.

[0003] The existing device for testing the cohesive force of an electrode involves pressing down on the electrode until the pressing head penetrates it, thereby measuring the cohesive force. However, the cohesive force measured by this device is not accurate enough. Summary of the Invention

[0004] This application provides a device for testing the cohesive force of an electrode, which can measure the cohesive force of the electrode more directly and accurately.

[0005] An apparatus for testing the cohesive force of an electrode includes:

[0006] The substrate is provided with fixing positions for fixing the electrode sheets;

[0007] A lifting assembly is movably disposed on the substrate and located directly above the fixed position. The lifting assembly includes a liftable lifting head and a plate that moves up and down with the lifting head. The plate can be fixed to the coating material on the electrode. During the lifting process, the lifting head applies tension to the coating material through the plate.

[0008] The electrode cohesion testing device provided in this application has a plate body for fixing the coating material on the electrode. During the upward movement of the lifting head, a tensile force is applied to the coating material through the plate body. This tensile force is opposite in direction to the adhesive force of the coating material being bonded to the current collector. If the coating material detaches from the current collector under a certain tensile force, the tensile force can more directly reflect the magnitude of the cohesion, and the measurement result is more accurate.

[0009] Optionally, the substrate is provided with an adhesive element for bonding and fixing the electrode to the substrate. The testing device further includes a pressure roller configured to roll over the adhesive element to apply pressure to the adhesive element bonded to the substrate. The pressure roller can more firmly bond the adhesive element to the fixing position, thereby more firmly fixing the electrode to the fixing position.

[0010] Optionally, the substrate further includes a groove, with the fixing position located within the groove. The pressure roller is also rotatably disposed within the groove, and the area of ​​the groove is larger than the area of ​​the fixing position. The rotatable mounting of the pressure roller within the groove prevents it from being lost.

[0011] Optionally, the plate has adhesive on the side facing the electrode, and the plate is used to bond and fix it to the coating material on the electrode. This fixing method is simple and easy to implement.

[0012] Optionally, the testing device further includes a vacuum assembly. The plate body has a cavity, and the surface of the plate facing the electrode has vents communicating with the cavity. The vacuum assembly communicates with the cavity, creating a negative pressure within the cavity and the vents. This facilitates cleaning of the adhered coating material after testing.

[0013] Optionally, the testing device further includes a safety component detachably mounted on the substrate, the safety component being located within the projection area of ​​the plate's orthographic projection in the lifting direction. The safety component serves to maintain a gap between the plate and the substrate, preventing injury to the operator from the lowering head during descent. The safety component can be removed after the electrode is positioned, at which point the lifting head can then drive the plate to move up and down normally.

[0014] Optionally, the area on the plate for fixed connection with the electrode is set to be equal to the area of ​​the coating material on the electrode. This setting ensures that all the coating material is fixedly connected to the plate, resulting in a more uniform tensile force on the coating material and more accurate measurement results.

[0015] Optionally, the testing device further includes a tension sensor disposed between the lifting head and the plate, and the base is also provided with a tension display instrument, which is electrically connected to the tension sensor and used to display the tension value. This allows the tension value to be obtained and observed more intuitively.

[0016] Optionally, the testing device further includes a drive assembly disposed on the base, the drive assembly being used to drive the lifting head to rise and fall. The drive assembly enables automatic upgrading of the lifting head, resulting in a higher degree of automation.

[0017] Optionally, the base includes a base and a support frame fixed to the base, the drive assembly is disposed on the base, and the lifting assembly is disposed on the support frame. This base has a simple structure and low manufacturing cost.

[0018] This application provides a device for testing the cohesive force of an electrode, wherein a plate is used to fix a coating material on the electrode, and a lifting head applies a tensile force to the coating material through the plate during its ascent. Since this tensile force is opposite in direction to the adhesive force that bonds the coating material to the current collector, if the coating material detaches from the current collector under a certain tensile force, this tensile force can more directly reflect the magnitude of the cohesive force, resulting in more accurate measurement results. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a testing apparatus shown in an exemplary embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the pressure roller rolling over the adhesive component;

[0021] Figure 3 This is a schematic diagram of the side surface of the plate facing the electrode.

[0022] Figure 4 This is another schematic diagram of the side surface of the plate facing the electrode.

[0023] Figure 5 This is a bottom view of the substrate. Detailed Implementation

[0024] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0025] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0026] Please refer to Figure 1 , Figure 1 This is a schematic diagram of an electrode cohesion testing apparatus 100 shown in an exemplary embodiment of this application.

[0027] This application provides a device 100 for testing the cohesive force of an electrode 200. The device 100 includes a substrate 10 and a lifting assembly 20. The substrate 10 has a fixing position 11 for fixing the electrode, and the electrode 200 can be adhered and fixed to the fixing position 11 using double-sided adhesive. The lifting assembly 20 is vertically and vertically disposed on the substrate 10 and located directly above the fixing position 11. The lifting direction of the lifting assembly 20 is consistent with the height direction of the substrate 10.

[0028] The lifting assembly 20 includes a liftable lifting head 21 and a plate 22 that moves up and down with the lifting head 21. The plate 22 is used to fix the coating material on the electrode sheet. During the lifting process, the lifting head applies tension to the coating material through the plate 22.

[0029] As described above, the plate 22 can apply a tensile force to the coating material under the action of the lifting head 21. This tensile force is opposite to the adhesive force of the coating material being bonded to the current collector. If the coating material detaches from the current collector under a certain tensile force, the tensile force can more directly reflect the magnitude of the cohesive force, and the measurement result is more accurate.

[0030] Please combine Figure 1 and Figure 2 , Figure 2 This is a schematic diagram of the pressure roller 30 rolling over the adhesive.

[0031] In one embodiment, the fixing position 11 is provided with an adhesive component 35, which includes, but is not limited to, double-sided adhesive. The adhesive component 35 is used to bond and fix the electrode 200 to the fixing position 11. The testing device 100 also includes a pressure roller 30, which is configured to roll over the adhesive component 35 along the S-direction to apply pressure to the adhesive component 35 within the fixing position 11. In this embodiment, applying pressure to the adhesive component 35 by the pressure roller 30 can more firmly bond the adhesive component 35 to the fixing position 11, thereby more firmly fixing the electrode within the fixing position 11. It should be noted that the adhesive force of the adhesive component 35 on the side of the electrode facing the fixing position 11 should be greater than the cohesive force of the electrode.

[0032] The pressure roller 30 can be set independently and is not connected to the base 10. In this embodiment, to avoid the loss of the pressure roller 30, the pressure roller 30 is installed on the base 10. Specifically, the base 10 is also provided with a groove 12, and the fixing position 11 is provided in the groove 12. The pressure roller 30 can also be rolled in the groove 12, and the area of ​​the groove 12 is larger than the area of ​​the fixing position 11.

[0033] exist Figure 1In the illustrated embodiment, the groove 12 is a square groove, and each of the two opposite sidewalls of the square groove may have a slotted groove (not shown in the figure). The two ends of the pressure roller 30 roll along the slotted groove, applying pressure to the bonded component during the rolling process. It should be noted that the pressure roller 30 can be tightly attached to the bottom surface of the groove 12 to ensure that the pressure roller 30 can apply pressure to the bonded component. The pressure roller 30 is located on one side of the fixing position 11, and it should also be ensured that the position of the pressure roller 30 does not interfere with the fixing of the plate 22 and the electrode sheet.

[0034] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the side surface of plate 22 facing the electrode.

[0035] The method of fixing the plate 22 to the coating material of the electrode is not limited. In one embodiment, the plate 22 has an adhesive 23 on its side facing the electrode, and the plate 22 is used to bond and fix it to the coating material on the electrode. This fixing method is simple and easy to implement. It should be noted that the adhesive force between the adhesive on the plate 22 and the coating material on the electrode should be greater than the cohesive force of the electrode. The adhesive includes, but is not limited to, double-sided tape.

[0036] Please refer to Figure 4 , Figure 4 This is another schematic diagram of the side surface of plate 22 facing the electrode.

[0037] In one embodiment, the testing device 100 further includes a vacuum assembly (not shown). The plate 22 has a cavity, and the surface of the plate 22 facing the electrode has vents 24 communicating with the cavity. The vacuum assembly can communicate with the cavity through an air pipe 25, creating a negative pressure within the cavity and the vents 24. In this design, creating a negative pressure by vacuuming keeps the plate 22 fixed to the coating material on the electrode, making it easier to clean the adhered coating material after testing. Figure 4 In the embodiment shown, there are multiple pores 24, which are evenly distributed to ensure the uniformity of the suction force on each part of the electrode.

[0038] Please refer to this again. Figure 1 In one embodiment, the testing device 100 further includes a safety component 40 detachably mounted on the base 10, the safety component 40 being located within the projection area of ​​the plate 22's orthographic projection in the lifting direction. The safety component 40 is used to maintain a gap between the plate 22 and the base 10, preventing the lifting head 21 from descent and injuring the operator. The safety component 40 can be removed after the electrode is positioned, at which point the lifting head 21 can drive the plate 22 to rise and fall normally. The specific implementation of the safety component 40 is not limited, and includes, but is not limited to, isolation blocks, inductive switches, etc.

[0039] In one embodiment, the area A on the plate 22 for fixed connection with the electrode is set to be equal to the area of ​​the coating material on the electrode. This setting allows all the coating material to be fixedly connected to the plate 22, resulting in a more uniform tensile force on the coating material and more accurate measurement results.

[0040] In one embodiment, the testing device 100 further includes a tension sensor 26 disposed between the lifting head 21 and the plate 22, and the base 10 is also provided with a tension display instrument 27, which is electrically connected to the tension sensor 26 and is used to display the tension value. This allows the tension value to be obtained and observed more intuitively.

[0041] Please refer to Figure 5 , Figure 5 This is a bottom view of the base 10. In one embodiment, the testing device 100 further includes a drive assembly 50 disposed on the base 10, the drive assembly 50 being used to drive the lifting head 21 to rise and fall. The drive assembly 50 may include a drive section and a transmission section. The drive section is energized to generate driving force, and the transmission section is used to transmit the driving force to the lifting head 21. The implementation of the transmission section is not limited, including but not limited to gear transmission and lead screw and nut transmission. The drive assembly 50 can realize automatic upgrading of the lifting head 21, achieving a higher degree of automation.

[0042] exist Figure 5 In the embodiment shown, the bottom surface of the base 10 is also provided with a support block 13. The bottom surface of the base 10 is square. Multiple support blocks 13 can be provided. Multiple support blocks 13 can be provided at the corners of the bottom surface of the base 10, but are not limited to this.

[0043] Please continue to refer to this. Figure 1 In one embodiment, the base 10 includes a base 10a and a support frame 10b fixed to the base 10a. The drive assembly 50 is mounted on the base 10a, and the lifting assembly 20 is mounted on the support frame 10b. The support frame 10b includes two side plates 14 erected on the base 10a and a top plate 15 connected to the two side plates 14. The lifting assembly 20 is mounted on the side of the top plate 15 facing the base 10a. This base 10 has a simple structure and low manufacturing cost.

[0044] When using the testing device 100, the operator can use the pressure roller 30 to evenly stick one side of the double-sided adhesive to the fixed position 11, and the other side of the double-sided adhesive to the electrode sheet. After the electrode sheet is bonded, the drive assembly 50 is activated, causing the lifting head 21 to move the plate 22 downward until it is bonded to the electrode sheet. For example, the plate 22 can be bonded and fixed to the coating material on the electrode sheet by using adhesive or a vacuum device. Then, the drive assembly 50 drives the lifting head 21 to move the plate 22 upward, and at the same time, the tension display instrument 27 starts to display data until the coating material on the electrode sheet is pulled apart. At this time, the maximum tension displayed by the tension display instrument 27 is the cohesive force of the electrode sheet.

[0045] It should be noted that when the plate 22 is bonded to the coating material on the electrode using an adhesive method, mechanical pressure needs to be applied downwards to the plate 22 for a period of time to ensure tight adhesion. It should also be noted that for electrodes with coating material on both sides of the current collector, the term "coating material being pulled apart" can refer to either the coating material on the upper surface of the current collector or the coating material on the lower surface of the current collector being pulled apart.

[0046] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A test device for testing the cohesion of an electrode tab, characterized by, The test device comprises: a base provided with a fixing position for fixing a pole piece; a lifting assembly provided on the base in a lifting manner and located directly above the fixing position, the lifting assembly comprising a lifting head capable of lifting and a plate body capable of lifting along with the lifting head, the plate body being capable of fixing a coating material on the pole piece, the lifting head applying a pulling force to the coating material through the plate body during lifting.

2. The test device of claim 1, wherein, The base is provided with an adhesive member for fixing the pole piece to the base, and the test device further comprises a compression roller arranged to roll over the adhesive member to apply pressure to the adhesive member fixed to the base.

3. The test device of claim 2, wherein, The base is further provided with a groove, the fixing position is arranged in the groove, and the compression roller is further arranged to roll in the groove, the area of the groove being greater than the area of the fixing position.

4. The test device according to any one of claims 1 to 3, characterized in that The plate body is provided with an adhesive on a side surface facing the pole piece, and the plate body is used to fix the pole piece by the adhesive.

5. The test device according to any one of claims 1 to 3, characterized in that The test device further comprises a vacuum extraction assembly, the plate body is provided with a cavity, and the plate body is further provided with an air hole communicating with the cavity on a side surface facing the pole piece, the vacuum extraction assembly communicating with the cavity to form negative pressure in the cavity and the air hole.

6. The test device according to any one of claims 1 to 3, wherein The test device further comprises a safety assembly detachably mounted on the base, the safety assembly being located in a projection area of a projection of the plate body in the lifting direction.

7. The test device according to any one of claims 1 to 3, wherein The area of the region of the plate body for fixing the pole piece is arranged to be equal to the area of the coating material on the pole piece.

8. The test device according to any one of claims 1 to 3, characterized in that The test device further comprises a pulling force sensor arranged between the lifting head and the plate body, and the base is further provided with a pulling force display instrument electrically connected with the pulling force sensor for displaying the pulling force value.

9. The test device according to any one of claims 1 to 3, characterized in that The test device further comprises a driving assembly arranged on the base, the driving assembly being used to drive the lifting head to lift.

10. The test device of claim 9, wherein, The base comprises a base and a support frame fixed to the base, the driving assembly is arranged on the base, and the lifting assembly is arranged on the support frame.

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