Pole piece embossing device

Abstract

This utility model provides an electrode embossing device, which includes: a first pressure roller with a first embossing portion; a second pressure roller with a second embossing portion offset from the first embossing portion; a first mating portion, the surface of the first pressure roller having a first groove, the first mating portion being embedded in the first groove, the first mating portion corresponding to the second embossing portion; and a second mating portion, the surface of the second pressure roller having a second groove, the second mating portion being embedded in the second groove, the second mating portion corresponding to the first embossing portion. When the electrode passes through the gap, the first embossing portion and the second mating portion press against the first surface of the electrode to form a first protrusion, and the second embossing portion and the first mating portion press against the second surface of the electrode to form a second protrusion. This electrode embossing device solves the technical problem of insufficient electrode deformation during roller pressing in related technologies.

Description

Technical Field

[0001] This utility model relates to the field of battery production technology, and more specifically, to an electrode embossing device. Background Technology

[0002] Because battery electrodes have a large coefficient of expansion during charging and discharging, sufficient space for cell expansion needs to be reserved inside the battery during production to ensure battery safety. Before winding the electrodes, they are usually rolled to deform them, thereby increasing the gap between adjacent electrode layers during winding and reserving space for cell expansion.

[0003] In related technologies, after the electrode is rolled, a protrusion is formed on one side of the electrode, causing deformation. When a large space is required for cell expansion, the height of these protrusions needs to be increased accordingly. However, this may cause the adhering substances on the electrode surface to fall off or even cause the electrode to break. Therefore, the height of these protrusions cannot be too high. Due to the limited protrusion height, the amount of electrode deformation during rolling in related technologies is insufficient, making it difficult to meet the cell's expansion space requirements in some cases.

[0004] It is evident that the relevant technologies suffer from insufficient electrode deformation during roll forming. Currently, no effective solution has been proposed to address this issue.

[0005] The information disclosed in the background section is only intended to enhance the understanding of the background art described herein. Therefore, the background art may contain information that would not be considered part of the prior art by those skilled in the art. Utility Model Content

[0006] The main purpose of this utility model is to provide an electrode embossing device to solve the technical problem of insufficient electrode deformation when rolling electrodes in related technologies.

[0007] To achieve the above objectives, embodiments of this utility model provide an electrode embossing device, which includes: a first pressure roller with a first embossing portion; a second pressure roller with a second embossing portion offset from the first embossing portion, the first and second pressure rollers being spaced apart, forming a gap between them for the electrode to pass through; a first mating portion with a first groove on the surface of the first pressure roller, the first mating portion being disposed in the first groove, and the first mating portion corresponding to the position of the second embossing portion; and a second mating portion with a second groove on the surface of the second pressure roller, the second mating portion being disposed in the second groove, and the second mating portion corresponding to the position of the first embossing portion. When the electrode passes through the gap, the first embossing portion and the second mating portion press against the first surface of the electrode to form a first protrusion, and the second embossing portion and the first mating portion press against the second surface of the electrode to form a second protrusion. The first and second surfaces are two opposing surfaces of the electrode.

[0008] Furthermore, the first embossed portion is a raised structure disposed on the surface of the first pressure roller, and the first surface is the surface of the electrode sheet near the second pressure roller; and / or, the second embossed portion is a raised structure disposed on the surface of the second pressure roller, and the second surface is the surface of the electrode sheet near the first pressure roller.

[0009] Further, the first mating part includes one of the following: a first recess, the shape of which matches at least a portion of the shape of the second embossed part; a first elastic material, which can undergo elastic deformation under the compression of the second embossed part; and / or, the second mating part is one of the following: a second recess, the shape of which matches at least a portion of the shape of the first embossed part; a second elastic material, which can undergo elastic deformation under the compression of the first embossed part.

[0010] Furthermore, the Shore hardness range of the first elastic material and / or the second elastic material is 40HA to 90HA.

[0011] Further, the first pressure roller includes multiple first embossing groups, which are arranged sequentially at intervals along the circumference of the first pressure roller; each first embossing group includes multiple first embossing parts, which are arranged sequentially at intervals along the axial direction of the first pressure roller; the second mating part is a strip structure extending along the axial direction of the second pressure roller, and there are multiple second mating parts, which are arranged sequentially at intervals along the circumference of the second pressure roller, with each second mating part corresponding to a position of a first embossing group; and / or, the second pressure roller includes multiple second embossing groups, which are arranged sequentially at intervals along the circumference of the second pressure roller; each second embossing group includes multiple second embossing parts, which are arranged sequentially at intervals along the axial direction of the second pressure roller; the first mating part is a strip structure extending along the axial direction of the first pressure roller, and there are multiple first mating parts, which are arranged sequentially at intervals along the circumference of the first pressure roller, with each first mating part corresponding to a position of a second embossing group.

[0012] Furthermore, the electrode embossing device also includes a transmission structure. The first pressure roller and the second pressure roller are both connected to the transmission structure. The transmission structure drives the first pressure roller and the second pressure roller to rotate at the same linear speed, and the rotation directions of the first pressure roller and the second pressure roller are opposite.

[0013] Furthermore, the transmission structure includes: a first gear, which is connected to the shaft of the first pressure roller; and a second gear, which is connected to the shaft of the second pressure roller, with the first gear meshing with the second gear.

[0014] Furthermore, the electrode embossing device includes a first gear and a second gear. The first gear is connected to the shaft of the first pressure roller, and the second gear is connected to the shaft of the second pressure roller. The first gear and the second gear mesh. The structure of the electrode embossing device satisfies: 1 < (R1 / R2) / (r1 / r2) ≤ 1.1 or 0.9 ≤ (R1 / R2) / (r1 / r2) < 1. The depth range of the first protrusion and the second protrusion formed by the electrode embossing device on the electrode surface is 0.4 mm to 1.2 mm. Wherein, R1 is the maximum distance from the first embossed part to the central axis of the first pressure roller, R2 is the maximum distance from the second embossed part to the central axis of the second pressure roller, r1 is the pitch circle radius of the first gear, and r2 is the pitch circle radius of the second gear.

[0015] Furthermore, the width of the first protrusion and the second protrusion ranges from 0.7 mm to 1.4 mm, the width being the dimension along the direction perpendicular to the depth, and / or, at least a portion of the surface of the first embossed portion is an arcuate surface; and / or, at least a portion of the surface of the second embossed portion is an arcuate surface.

[0016] Furthermore, the electrode embossing device satisfies at least one of the following: the first embossing part and the first pressure roller are an integral structure; the second embossing part and the second pressure roller are an integral structure; the first embossing part is a metal part, and the surface of the first embossing part is provided with a first wear-resistant coating; the second embossing part is a metal part, and the surface of the second embossing part is provided with a second wear-resistant coating.

[0017] The electrode embossing device applying the technical solution of this utility model includes: a first pressure roller, on which a first embossing portion is provided; a second pressure roller, on which a second embossing portion is provided, the second embossing portion being offset from the first embossing portion, the first pressure roller and the second pressure roller being spaced apart, forming a gap between the first pressure roller and the second pressure roller for the electrode to pass through; a first mating portion, on which a first groove is provided on the surface of the first pressure roller, the first mating portion being embedded in the first groove, the first mating portion being positioned corresponding to the second embossing portion; and a second mating portion, on which a second groove is provided on the surface of the second pressure roller, the second mating portion being embedded in the second groove, the second mating portion being positioned corresponding to the first embossing portion; wherein, when the electrode passes through the gap, the first embossing portion and the second mating portion are pressed on the first surface of the electrode to form a first protrusion, and the second embossing portion and the first mating portion are pressed on the second surface of the electrode to form a second protrusion, the first surface and the second surface being two opposing surfaces of the electrode. This electrode embossing device features a first embossing section on a first pressure roller and a second embossing section on a second pressure roller. The first and second embossing sections are offset to prevent interference. A first groove is formed on the surface of the first pressure roller, within which a first mating part is embedded. Similarly, a second groove is formed on the surface of the second pressure roller, within which a second mating part is embedded, ensuring the stability of the first and second mating parts and their accurate positioning during use. As the electrode passes through the gap between the first and second pressure rollers, when the first embossing section contacts the electrode, both the first and second mating parts apply pressure to both sides of the electrode. This causes a first protrusion on the first surface of the electrode under the action of the first embossing section. Similarly, when the second embossing section contacts the electrode, both the second and first mating parts apply pressure to both sides of the electrode, causing a second protrusion on the second surface of the electrode under the action of the second embossing section. Thus, since the first and second protrusions are located on different sides of the electrode sheet, the overall thickness of the electrode sheet after rolling is the thickness of the electrode sheet itself plus the heights of the first and second protrusions. Even if the height of the protrusion on one side of the electrode sheet is not high, the overall thickness of the electrode sheet will change significantly. The electrode sheet embossing device with the above-described structure can form protrusions on both sides of the electrode sheet, effectively increasing the deformation of the electrode sheet during rolling. It can meet the requirement of a large amount of electrode sheet deformation without making the height of a single protrusion too high. While avoiding significant damage to the electrode sheet, it solves the technical problem of insufficient electrode sheet deformation during rolling in related technologies. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 This is a schematic diagram from a first-view perspective of an embodiment of the electrode embossing device of the present invention during electrode embossing.

[0020] Figure 2 This is a schematic diagram from a second perspective of an embodiment of the electrode embossing device of the present invention, showing the electrode being embossed during the embossing process.

[0021] Figure 3 This is a schematic diagram of the electrode embossing device of this utility model from a third-person perspective.

[0022] Figure 4 This is a schematic diagram of the structure of the first pressure roller in an embodiment of the electrode embossing device of this utility model;

[0023] Figure 5 This is a cross-sectional view of the first pressure roller in an embodiment of the electrode embossing device of this utility model.

[0024] Figure 6 This is a schematic diagram of a portion of the structure of an embodiment of the electrode embossing device of this utility model.

[0025] The above figures include the following reference numerals:

[0026] 1. First pressure roller; 11. First embossing section; 12. First mating section;

[0027] 2. Second pressure roller; 21. Second embossing section; 22. Second mating section;

[0028] 3. Transmission structure; 31. First gear; 32. Second gear;

[0029] 10. Electrode film;

[0030] 20. Gap;

[0031] 30. First protrusion;

[0032] 40. Second protrusion. Detailed Implementation

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] Please refer to Figures 1 to 5To address the technical problems in the background section, embodiments of this utility model provide an electrode embossing device, comprising: a first pressure roller 1, on which a first embossing portion 11 is provided; a second pressure roller 2, on which a second embossing portion 21 is provided, the second embossing portion 21 being offset from the first embossing portion 11, the first pressure roller 1 and the second pressure roller 2 being spaced apart, a gap 20 being formed between the first pressure roller 1 and the second pressure roller 2 for the electrode 10 to pass through; and a first mating portion 12, on which a first groove is provided on the surface of the first pressure roller 1, the first mating portion 12 being disposed on the first pressure roller 1. The groove, the first mating part 12 and the second embossing part 21 are positioned correspondingly; the second mating part 22, the surface of the second pressure roller 2 is provided with a second groove, the second mating part 22 is provided in the second groove, the second mating part 22 is positioned corresponding to the first embossing part 11; wherein, when the electrode 10 passes through the gap 20, the first embossing part 11 and the second mating part 22 are pressed on the first surface of the electrode 10 to form a first protrusion 30, the second embossing part 21 and the first mating part 12 are pressed on the second surface of the electrode 10 to form a second protrusion 40, the first surface and the second surface are two opposing surfaces of the electrode 10.

[0035] The electrode embossing device with this structural design has a first embossing part 11 on the first pressure roller 1 and a second embossing part 21 on the second pressure roller 2. The first embossing part 11 and the second embossing part 21 are misaligned to avoid interference between them. A first groove is provided on the surface of the first pressure roller 1, and a first mating part 12 is embedded in the first groove. A second groove is provided on the surface of the second pressure roller 2, and a second mating part 22 is embedded in the second groove, ensuring the stability of the installation of the first mating part 12 and the accuracy of their positions during use. During the process of the electrode sheet 10 passing through the gap 20 between the first pressure roller 1 and the second pressure roller 2, when the first embossing part 11 contacts the electrode sheet 10, the first embossing part 11 and the second mating part 22 apply pressure to both sides of the electrode sheet 10 respectively. This causes a first protrusion 30 to form on the first surface of the electrode sheet 10 under the action of the first embossing part 11. When the second embossing part 21 contacts the electrode sheet 10, the second embossing part 21 and the first mating part 12 apply pressure to both sides of the electrode sheet 10 respectively. This causes a second protrusion 40 to form on the second surface of the electrode sheet 10 under the action of the second embossing part 21. Thus, since the first protrusion 30 and the second protrusion 40 are located on different sides of the electrode sheet 10, the overall thickness of the electrode sheet 10 after rolling is the thickness of the electrode sheet 10 itself plus the height of the first protrusion 30 and the height of the second protrusion 40. Even if the height of the protrusion on one side of the electrode sheet 10 is not high, the overall thickness of the electrode sheet 10 will change significantly. The electrode embossing device with the above-mentioned structure can form protrusions on both sides of the electrode 10, which effectively increases the deformation of the electrode 10 during rolling. It can meet the large electrode deformation requirements without making the height of a single protrusion too high. While avoiding causing significant damage to the electrode 10, it solves the technical problem of insufficient electrode deformation during rolling in related technologies.

[0036] In specific implementation, the first embossed portion 11 and the second embossed portion 21 can be any structure capable of forming a recessed or raised embossed pattern on the surface of the electrode sheet 10. For example, it can be a raised or recessed shape of various shapes.

[0037] For example, such as Figures 1 to 5As shown, in this embodiment, the first embossing portion 11 is a raised structure disposed on the roller surface of the first pressure roller 1, and the first surface is the surface of the electrode 10 near the second pressure roller 2; the second embossing portion 21 is a raised structure disposed on the roller surface of the second pressure roller 2, and the second surface is the surface of the electrode 10 near the first pressure roller 1. In this embodiment, the first embossing portion 11 can press a pit into the surface of the electrode 10 during rolling, and correspondingly, the aforementioned first protrusion 30 will be formed on the other side of the electrode 10. At this time, the side of the electrode 10 near the second pressure roller 2 is the first surface. The second embossing portion 21 can also press a pit into the surface of the electrode 10 during rolling, and correspondingly, the aforementioned second protrusion 40 will be formed on the other side of the electrode 10. At this time, the side of the electrode 10 near the first pressure roller 1 is the aforementioned second surface. As a preferred embodiment, the first embossing portion 11 is a spherical protrusion, and the second embossing portion 21 is a spherical protrusion, thereby reducing damage to the electrode 10.

[0038] In related technologies, electrode embossing devices can only emboss protrusions on one side of the electrode, while the electrode embossing device of this utility model can emboss protrusions on both sides of the electrode 10, such as... Figure 2 As shown, when the electrode 10 is in a flat state, its material thickness is h. After being embossed by the electrode embossing device, a first protrusion 30 and a second protrusion 40 are formed on both sides of the electrode 10. At this time, the overall thickness of the electrode 10 becomes H, which is greater than h by the height of the two protrusions. The electrode 10 has greater deformation, which allows for more space for cell expansion during winding, ensuring the safety of the battery during charging. Figures 1 to 5 As shown, it is important to emphasize that the first mating part 12 and the second mating part 22 of the electrode embossing device in this embodiment of the present invention are installed in an embedded manner. Specifically, a first groove is provided on the first pressure roller 1, and the first mating part 12 is embedded in the first groove; similarly, a second groove is provided on the second pressure roller 2, and the second mating part 22 is embedded in the second groove. This method of pre-setting grooves and embedding installation can ensure the installation reliability of the first mating part 12 and the second mating part 22, reduce the risk of the first mating part 12 and the second mating part 22 falling off, and ensure that the positions of the first mating part 12 and the second mating part 22 are stable after installation and not easily moved. This ensures that the first mating part 12 accurately mates with the second embossing part 21, and the second mating part 22 accurately mates with the first embossing part 11, thereby ensuring the embossing effect.

[0039] In specific implementations, the first mating part 12 and the second mating part 22 can have different specific forms, as long as they can cooperate with the first embossed part 11 and the second embossed part 21 to better shape the first protrusion 30 and the second protrusion 40. For example, in this embodiment, the first mating part 12 includes one of the following: a first recess, the shape of which matches at least a portion of the shape of the second embossed part 21; a first elastic material, which can undergo elastic deformation under the compression of the second embossed part 21; the second mating part 22 includes one of the following: a second recess, the shape of which matches at least a portion of the shape of the first embossed part 11; a second elastic material, which can undergo elastic deformation under the compression of the first embossed part 11.

[0040] In a preferred embodiment, the Shore hardness of the first and / or second elastic materials ranges from 40 HA to 90 HA. By selecting materials within this hardness range, when the first embossed portion 11 presses against the second embossed portion 21, a suitable reaction force is provided while the elastic material deforms, thereby facilitating the shaping of the first protrusion 30 and the second protrusion 40. This avoids the situation where the elastic material is too hard, making it difficult to dent under compression, and also avoids the situation where the elastic material is too soft, resulting in insufficient support for the electrode 10 and poor shaping of the first protrusion 30 and the second protrusion 40.

[0041] In this embodiment, the first pressure roller 1 includes multiple first embossing groups, which are arranged sequentially and spaced apart along the circumference of the first pressure roller 1; each first embossing group includes multiple first embossing parts 11, which are arranged sequentially and spaced apart along the axial direction of the first pressure roller 1; the second mating part 22 is a strip-shaped structure extending along the axial direction of the second pressure roller 2, and there are multiple second mating parts 22, which are arranged sequentially and spaced apart along the circumference of the second pressure roller 2, with each second mating part 22 corresponding to a position of a first embossing group. ; and / or, the second pressure roller 2 includes a plurality of second embossing groups, which are arranged sequentially at intervals along the circumference of the second pressure roller 2; each second embossing group includes a plurality of second embossing parts 21, which are arranged sequentially at intervals along the axial direction of the second pressure roller 2; the first mating part 12 is a strip structure extending along the axial direction of the first pressure roller 1, and there are a plurality of first mating parts 12, which are arranged sequentially at intervals along the circumference of the first pressure roller 1, and any one of the first mating parts 12 corresponds to the position of a second embossing group. That is, there are multiple first embossing parts 11, which are divided into multiple groups, each group including multiple first embossing parts 11, and the multiple groups of first embossing parts 11 are arranged at intervals along the circumference of the first pressure roller 1; the second mating part 22 is a strip structure extending along the axial direction of the second pressure roller 2, and there are multiple second mating parts 22, which are arranged at intervals along the circumference of the second pressure roller 2, and any one of the second mating parts 22 corresponds to the position of a group of first embossing parts 11; and / or, there are multiple second embossing parts 21, which are divided into multiple groups, each group including multiple second embossing parts 21, and the multiple groups of second embossing parts 21 are arranged at intervals along the circumference of the second pressure roller 2; the first mating part 12 is a strip structure extending along the axial direction of the first pressure roller 1, and there are multiple first mating parts 12, which are arranged at intervals along the circumference of the first pressure roller 1, and any one of the first mating parts 12 corresponds to the position of a group of second embossing parts 21. In this way, the arrangement of the first embossing part 11 and the first mating part 12 can be realized more rationally, as can the arrangement of the second embossing part 21 and the second mating part 22, achieving more efficient space utilization. This allows for a more compact and orderly arrangement of the structure for forming protrusions on the first pressure roller 1 and the second pressure roller 2, and more efficient embossing of the electrode sheet 10.

[0042] like Figures 1 to 3 As shown, in some preferred embodiments, the electrode embossing device includes a transmission structure 3. The first pressure roller 1 and the second pressure roller 2 are both connected to the transmission structure 3. The transmission structure 3 drives the first pressure roller 1 and the second pressure roller 2 to rotate, and can constrain the rotation of the first pressure roller 1 and the second pressure roller 2 so that the first pressure roller 1 and the second pressure roller 2 always rotate in opposite directions and at the same linear velocity (e.g., ...). Figure 2(The rotation direction is shown). By setting the transmission structure 3, the first pressure roller 1 and the second pressure roller 2 can be kept rotating synchronously under the transmission action of the transmission structure 3. Specifically, the linear speed of their rotation can be kept the same, and their rotation directions are opposite. In this way, when the electrode sheet 10 is fed, the first pressure roller 1 and the second pressure roller 2 can roll the two sides of the electrode sheet 10 synchronously, which can avoid the scratching or tearing of the surface of the electrode sheet 10 caused by the asynchronous rotation of the two pressure rollers, thereby ensuring the embossing stability of the electrode sheet embossing device.

[0043] It should be noted that the linear velocity here refers to the linear velocity of the point on the first pressure roller 1 and the second pressure roller 2 that is furthest from its axis when rotating around its axis. When the first embossing part 11 is a raised structure provided on the roller surface of the first pressure roller 1 and the second embossing part 21 is a raised structure provided on the roller surface of the second pressure roller 2, the linear velocity mentioned here refers to the linear velocity of the highest point of the raised structure when rotating.

[0044] In specific implementation, the transmission structure 3 can be selected from various implementation schemes according to the actual situation. For example, the first pressure roller 1 and the second pressure roller 2 can be connected by gear transmission. Another example is that the first pressure roller 1 and the second pressure roller 2 can be connected by synchronous belt transmission. In order to ensure that the two rotate in opposite directions, the synchronous belt can be installed in a figure-eight shape.

[0045] For example, in this embodiment, the transmission structure 3 includes: a first gear 31 connected to the shaft of the first pressure roller 1; and a second gear 32 connected to the shaft of the second pressure roller 2, with the first gear 31 and the second gear 32 meshing. The rigid meshing of the first gear 31 and the second gear 32 ensures the synchronicity of the rotation of the first pressure roller 1 and the second pressure roller 2, thereby avoiding a speed difference between them. This structural design has advantages such as simple structure, high reliability, and smooth operation, avoiding the problem of scratching or tearing of the electrode sheet 10 surface due to asynchronous rotation of the two pressure rollers.

[0046] like Figure 6As shown, in some other preferred embodiments, the electrode embossing device includes a first gear 31 and a second gear 32. The first gear 31 is connected to the shaft of the first pressure roller 1, and the second gear 32 is connected to the shaft of the second pressure roller 2. The first gear 31 and the second gear 32 mesh. The structure of the electrode embossing device satisfies: 1 < (R1 / R2) / (r1 / r2) ≤ 1.1 or 0.9 ≤ (R1 / R2) / (r1 / r2) < 1. The electrode embossing device rolls the first protrusion 30 and the second protrusion 40 formed on the surface of the electrode 10. The depth range is 0.4mm to 1.2mm; where R1 is the maximum distance from the first embossing part 11 to the central axis of the first pressure roller 1, that is, the radius of the outer circle of the first pressure roller 1, which contacts the vertex of the first embossing part 11 on the first pressure roller 1; R2 is the maximum distance from the second embossing part 21 to the central axis of the second pressure roller 2, that is, the radius of the outer circle of the second pressure roller 2, which contacts the vertex of the second embossing part 21 on the second pressure roller 2; r1 is the pitch circle radius of the first gear 31; and r2 is the pitch circle radius of the second gear 32. In this embodiment, the first pressure roller 1 and the second pressure roller 2 are designed to rotate asynchronously, i.e., 1 < (R1 / R2) / (r1 / r2) ≤ 1.1 or 0.9 ≤ (R1 / R2) / (r1 / r2) < 1. When the first pressure roller 1 and the second pressure roller 2 rotate, there is a small difference in their linear velocities (the linear velocity of the point on the pressure roller furthest from its axis when rotating around its axis). Because the first embossing portion 11 and the second embossing portion 21 of the first pressure roller 1 and the second pressure roller 2 are misaligned, they will not simultaneously press the electrode sheet 10 towards each other. At any given time, only one of them will emboss the electrode sheet 10 and drive it to move. That is, the two alternately contact and emboss the electrode sheet 10 and drive it to move. When the difference in their linear velocities is small, the surface of the electrode sheet 10 will not be scratched or torn. When a certain embossed part mates with a corresponding mating part, the difference in linear velocity will enlarge the protrusion formed by rolling, thereby increasing the embossing size without changing the embossing part structure, and thus increasing the deformation of the electrode 10. Preferably, the width of the first protrusion 30 and the second protrusion 40 ranges from 0.7 mm to 1.4 mm. With protrusions designed within this width range, the reserved expansion space of the wound cell is more reasonable, which can improve the safety of the battery. At least a portion of the surfaces of the first embossed part 11 and the second embossed part 21 are arc-shaped, thereby reducing scratch damage to the surface of the electrode 10.

[0047] In this embodiment, the electrode embossing device satisfies at least one of the following: the first embossing part 11 and the first pressure roller 1 are integrally formed; the second embossing part 21 and the second pressure roller 2 are integrally formed; the first embossing part 11 is made of metal and has a first wear-resistant coating on its surface; the second embossing part 21 is made of metal and has a second wear-resistant coating on its surface.

[0048] By designing the first embossing part 11 and the first pressure roller 1 as an integral structure, or by designing the second embossing part 21 and the second pressure roller 2 as an integral structure, the connection reliability of the pressure roller structure and its corresponding embossing parts can be improved, avoiding the risk of embossing parts falling off. Furthermore, by designing a wear-resistant coating on the corresponding embossing parts, the wear of the embossing parts can be effectively reduced, the service life of the embossing parts can be increased, and the long-term operation of the electrode embossing device can be facilitated.

[0049] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0050] The electrode embossing device of this utility model includes: a first pressure roller 1, on which a first embossing portion 11 is provided; a second pressure roller 2, on which a second embossing portion 21 is provided, the second embossing portion 21 being offset from the first embossing portion 11, the first pressure roller 1 and the second pressure roller 2 being spaced apart, and a gap 20 being formed between the first pressure roller 1 and the second pressure roller 2 for the electrode 10 to pass through; and a first mating portion 12, on which a first groove is provided on the surface of the first pressure roller 1, the first mating portion 12 being embedded, and the first mating portion 12 being engaged with the second embossing portion 21. The position of part 21 corresponds to that of part 21; the second mating part 22 is provided on the surface of the second pressure roller 2 with a second groove, and the second mating part 22 is embedded in the second groove, the position of the second mating part 22 corresponds to that of the first embossing part 11; wherein, when the electrode 10 passes through the gap 20, the first embossing part 11 and the second mating part 22 are pressed on the first surface of the electrode 10 to form a first protrusion 30, and the second embossing part 21 and the first mating part 12 are pressed on the second surface of the electrode 10 to form a second protrusion 40, the first surface and the second surface are two opposing surfaces of the electrode 10. With this structure, the electrode embossing device has a first embossing part 11 on the first pressure roller 1 and a second embossing part 21 on the second pressure roller 2, the first embossing part 11 and the second embossing part 21 are misaligned, thereby avoiding mutual interference between the two. A first groove is provided on the surface of the first pressure roller 1, and a first mating part 12 is embedded in the first groove. A second groove is provided on the surface of the second pressure roller 2, and a second mating part 22 is embedded in the second groove, ensuring the stability of the installation of the first mating part 12 and the accuracy of their positions during use. During the process of the electrode sheet 10 passing through the gap 20 between the first pressure roller 1 and the second pressure roller 2, when the first embossing part 11 contacts the electrode sheet 10, the first embossing part 11 and the second mating part 22 apply pressure to both sides of the electrode sheet 10 respectively. Thus, under the action of the first embossing part 11, a first protrusion 30 is generated on the first surface of the electrode sheet 10. When the second embossing part 21 contacts the electrode sheet 10, the second embossing part 21 and the first mating part 12 apply pressure to both sides of the electrode sheet 10 respectively. Thus, under the action of the second embossing part 21, a second protrusion 40 is generated on the second surface of the electrode sheet 10. Thus, since the first protrusion 30 and the second protrusion 40 are located on different sides of the electrode 10, the overall thickness of the electrode 10 after rolling is the thickness of the electrode 10 itself plus the height of the first protrusion 30 and the height of the second protrusion 40. Even if the height of the protrusion on one side of the electrode 10 is not high, the overall thickness of the electrode 10 will change significantly. The electrode embossing device with the above-described structure can form protrusions on both sides of the electrode 10, effectively increasing the deformation of the electrode 10 during rolling. It can meet the requirement of a large electrode deformation without making the height of a single protrusion too high. While avoiding significant damage to the electrode 10, it solves the technical problem of insufficient electrode deformation during rolling in related technologies.

[0051] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0052] 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. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0053] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0054] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electrode embossing device, characterized in that, include: The first pressure roller (1) is provided with a first embossing part (11); The second pressure roller (2) is provided with a second embossing part (21), the second embossing part (21) is offset from the first embossing part (11), the first pressure roller (1) and the second pressure roller (2) are spaced apart, and a gap (20) is formed between the first pressure roller (1) and the second pressure roller (2) for the electrode sheet (10) to pass through. The first mating part (12) is provided with a first groove on the surface of the first pressure roller (1), and the first mating part (12) is provided in the first groove. The position of the first mating part (12) corresponds to that of the second embossing part (21). The second mating part (22) is provided on the surface of the second pressure roller (2) with a second groove, and the second mating part (22) is provided in the second groove. The position of the second mating part (22) corresponds to that of the first embossing part (11). When the electrode (10) passes through the gap (20), the first embossed part (11) and the second mating part (22) are pressed to form a first protrusion (30) on the first surface of the electrode (10), and the second embossed part (21) and the first mating part (12) are pressed to form a second protrusion (40) on the second surface of the electrode (10). The first surface and the second surface are two opposing surfaces of the electrode (10).

2. The electrode embossing device according to claim 1, characterized in that, The first embossed portion (11) is a raised structure disposed on the roller surface of the first pressure roller (1), and the first surface is the surface of the electrode sheet (10) near the second pressure roller (2); and / or, The second embossed part (21) is a raised structure provided on the roller surface of the second pressure roller (2), and the second surface is the surface of the electrode sheet (10) near the first pressure roller (1).

3. The electrode embossing device according to claim 2, characterized in that, The first mating part (12) includes one of the following: a first recess, the shape of which matches at least a portion of the shape of the second embossed part (21); a first elastic material, the first elastic material being elastically deformable under the compression of the second embossed part (21); and / or, The second mating part (22) includes one of the following: a second recess, the shape of which matches at least a portion of the shape of the first embossed part (11); and a second elastic material, which can be elastically deformed under the compression of the first embossed part (11).

4. The electrode embossing device according to claim 3, characterized in that, The Shore hardness range of the first elastic material and / or the second elastic material is 40HA to 90HA.

5. The electrode embossing device according to claim 2, characterized in that, The first pressure roller (1) includes a plurality of first embossing groups, which are arranged sequentially at intervals along the circumference of the first pressure roller (1); each first embossing group includes a plurality of first embossing parts (11), which are arranged sequentially at intervals along the axial direction of the first pressure roller (1); the second mating part (22) is a strip structure extending along the axial direction of the second pressure roller (2), and there are a plurality of second mating parts (22), which are arranged sequentially at intervals along the circumference of the second pressure roller (2), and any one of the second mating parts (22) corresponds to one of the first embossing groups; and / or, The second pressure roller (2) includes a plurality of second embossing groups, which are arranged sequentially at intervals along the circumference of the second pressure roller (2); each second embossing group includes a plurality of second embossing parts (21), which are arranged sequentially at intervals along the axial direction of the second pressure roller (2); the first mating part (12) is a strip structure extending along the axial direction of the first pressure roller (1), and there are a plurality of first mating parts (12), which are arranged sequentially at intervals along the circumference of the first pressure roller (1), and any one of the first mating parts (12) corresponds to the position of one of the second embossing groups.

6. The electrode embossing apparatus according to any one of claims 1 to 5, characterized in that, The electrode embossing device further includes a transmission structure (3), the first pressure roller (1) and the second pressure roller (2) are both connected to the transmission structure (3), the transmission structure (3) drives the first pressure roller (1) and the second pressure roller (2) to rotate at the same linear speed, and the rotation directions of the first pressure roller (1) and the second pressure roller (2) are opposite.

7. The electrode embossing device according to claim 6, characterized in that, The transmission structure (3) includes: The first gear (31) is connected to the shaft of the first pressure roller (1); The second gear (32) is connected to the shaft of the second pressure roller (2), and the first gear (31) meshes with the second gear (32).

8. The electrode embossing device according to claim 2, characterized in that, The electrode embossing device includes a first gear (31) and a second gear (32). The first gear (31) is connected to the shaft of the first pressure roller (1), and the second gear (32) is connected to the shaft of the second pressure roller (2). The first gear (31) and the second gear (32) mesh. The structure of the electrode embossing device satisfies the following: 1 < (R1 / R2) / (r1 / r2) ≤ 1.1 or 0.9 ≤ (R1 / R2) / (r1 / r2) < 1; The depth range of the first protrusion (30) and the second protrusion (40) formed by the electrode embossing device on the surface of the electrode (10) is 0.4 mm to 1.2 mm; Wherein, R1 is the maximum distance from the first embossing part (11) to the central axis of the first pressure roller (1), R2 is the maximum distance from the second embossing part (21) to the central axis of the second pressure roller (2), r1 is the pitch circle radius of the first gear (31), and r2 is the pitch circle radius of the second gear (32).

9. The electrode embossing device according to claim 8, characterized in that, The width of the first protrusion (30) and the second protrusion (40) ranges from 0.7 mm to 1.4 mm, the width being the dimension along the direction perpendicular to the depth, and / or, at least a portion of the surface of the first embossed portion (11) is an arcuate surface; and / or, at least a portion of the surface of the second embossed portion (21) is an arcuate surface.

10. The electrode embossing apparatus according to any one of claims 1 to 5, characterized in that, The electrode embossing device satisfies at least one of the following: The first embossing part (11) and the first pressure roller (1) are an integral structure; The second embossing part (21) and the second pressure roller (2) are an integral structure; The first embossed part (11) is a metal part, and the surface of the first embossed part (11) is provided with a first wear-resistant coating; The second embossed part (21) is a metal part, and the surface of the second embossed part (21) is provided with a second wear-resistant coating.

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