Rolling punching device and conductive film

Abstract

The utility model discloses a roll-in punching device and a conductive film, and belongs to the technical field of current collectors, the roll-in punching device comprises a punching assembly used for punching a film material; the pressure bearing assembly is used for providing support for the membrane material during rolling and punching; the transmission roller set comprises a guide roller and a tension roller and is used for controlling the transmission direction and tension of the membrane material, and the position of a related roller body corresponds to the pressure-bearing roller, so that the membrane material is attached to the surface of the pressure-bearing roller at a certain wrap angle; and the cushion material assembly comprises a first cushion material which is attached to the surface of the pressure bearing assembly and is movably arranged. According to the roll-in punching device, micropores can be conveniently and quickly formed in the surface of a membrane material to be treated, so that pores distributed in a certain density are formed in at least one surface of a prepared conductive membrane and serve as accommodating cavities, and the vacuum hardening condition after subsequent rolling is relieved.

Description

Technical Field

[0001] The utility model relates to the technical field of thin films, in particular to a roller punching device and a conductive film. Background Art

[0002] The rechargeable nature of secondary batteries has made them a common energy storage device in modern society. Among all types of secondary batteries, lithium-ion batteries, with their higher energy density, are widely used in various fields, including consumer electronics, electric vehicles, and energy storage power stations. With the continuous development of mobile phones and electric vehicles, the demand for the energy density of lithium-ion batteries is also increasing.

[0003] As a current collector for carrying active materials, in order to reduce internal resistance, the surface of the current collector is roughened to form grooves or protrusions on the surface of the current collector, thereby increasing the surface area of ​​the current collector and increasing the contact between the current collector and the electrode active material.

[0004] In the prior art 1 The foil is roughened by opening holes on the surface of the metal foil.

[0005] When using metal foil as the current collector, its thickness is generally above 6μm, and 8-12μm is commonly used. Since the thickness of the foil is relatively thicker than that of the composite current collector, and the metal material is difficult to be compressed compared to the supporting layer substrate such as polymer and graphite, in the existing technology, the openings are mainly through holes, and the main purpose is to reduce the weight of the current collector.

[0006] Further improvement and optimization are needed.

[0007] Existing technology: 1.CN219610487U. Utility Model Content

[0008] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, one purpose of the present invention is to provide a roller punching device that can quickly and conveniently form micropores on the surface of a film to be processed.

[0009] This application also proposes a conductive film prepared based on a rolled film, which can form a conductive layer in the pores, thereby increasing the filling amount of active materials to a certain extent and increasing the energy density.

[0010] The technical solution of the utility model is as follows:

[0011] A roller punching device, comprising:

[0012] Punching component, used to perforate the membrane material;

[0013] The pressure-bearing component is used to provide support for the membrane material during roller punching;

[0014] The transmission roller group includes a guide roller and a tension roller, which is used to control the transmission direction and tension of the film material. The position of the relevant roller body corresponds to the setting of the pressure roller so that the film material is attached to the surface of the pressure roller at a certain wrap angle;

[0015] And, the cushion material assembly includes a first cushion material that is attached to the surface of the pressure-bearing assembly and is movably arranged.

[0016] Based on the above technical solution, by independently setting up a movable pad material, the puncture needle is isolated to protect the pressure-bearing component and the punching component, preventing the puncture needle from penetrating the film material and contacting the pressure roller, and at the same time, facilitating maintenance and replacement.

[0017] Furthermore, the punching assembly includes a rotatable needle roller, the outer periphery of which is provided with puncture needles, which are installed on the bracket through bearings.

[0018] Furthermore, the pressure-bearing component is configured as a pressure-bearing roller, which is correspondingly arranged in the space below the needle roller.

[0019] Based on the above technical solution, it is convenient to continuously punch holes in the membrane material.

[0020] Furthermore, the pressure roller is a driving roller or a driven roller.

[0021] Furthermore, the mat material assembly also includes a roller group for driving the mat material to move, including an unwinding roller and a winding roller for unwinding and winding the mat material, and a guide roller group for adjusting the transmission direction of the mat material.

[0022] Based on the above technical solution, it is convenient to replace the cushion material.

[0023] Furthermore, the first cushion material and the membrane material remain relatively still.

[0024] Based on the above technical solution, damage to the membrane material can be reduced.

[0025] Furthermore, the material of the protective film can be selected from conventional commercially available thin film materials, and its thickness is set to 10-1000 μm.

[0026] Furthermore, a heating component is provided corresponding to the needles of the needle roller.

[0027] Based on the above technical solution, it is convenient to punch holes in the polymer substrate.

[0028] Furthermore, the heating assembly includes a plurality of heat pipes arranged around the outer edge of the needle roller. The heat pipes can be arranged along the axial direction and fixed on the arc-shaped cover at intervals.

[0029] Based on the above technical solution, the annularly distributed heating components can ensure the heating effect.

[0030] Furthermore, the mat material assembly includes a second mat material movably arranged corresponding to the film material. The second mat material is arranged on a side of the film material close to the needle roller and maintains a certain contact angle with the pressure roller through a related guide roller group.

[0031] Based on the above technical solution, during acupuncture, the second pad material is penetrated in advance, and the second pad material plays a certain positioning role for the needle tip of the acupuncture, preventing the needle tip from shaking and aggravating the deformation of the needle tip during the puncture process. At the same time, foreign matter on the surface of the needle tip will also be partially removed during the puncture process.

[0032] Furthermore, the second cushion material is thicker than the first cushion material.

[0033] Furthermore, the thickness of the second pad material is 20-2000 μm.

[0034] Based on the above technical solution, the protection of the membrane surface and the further improvement of the puncture effect are taken into consideration.

[0035] A conductive film comprises a base film prepared based on the above-mentioned roller punching device, and a conductive layer is formed on the surface of the base film. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0037] Figure 1 It is a structural schematic diagram of a roller pressing device;

[0038] Figure 2 This is a structural schematic diagram of the improved roller pressing device.

[0039] In the picture:

[0040] 0-film material; 01-transmission roller group; 1-needle roller; 11-puncture needle; 2-pressure roller; 3-mat material assembly; 31-unwinding roller; 32-winding roller; 33-first mat material; 34-guide roller group; 35-second mat material; 4-heating assembly; 41-heat pipe. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0043] In the prior art, when punching holes, especially through holes, the punching die or the pressure roller is easily worn or damaged prematurely.

[0044] In order to solve the above technical problems, some embodiments of the present application provide a roller punching device, referring to Figure 1 , which includes:

[0045] The punching assembly is used to punch holes in the film material 0. In this embodiment, it is provided as a rotatable needle roller 1, and the outer periphery of the needle roller 11 is provided. The needle roller 11 is mounted on the bracket through a bearing and can be further driven by a driving mechanism. The driving mechanism can be a motor or a transmission member driven by the motor (such as a gear meshing with a gear on a shaft to drive the gear);

[0046] The pressure component is used to provide support force for the film material 0 during roller punching; in this embodiment, it is set as a pressure roller 2, which is correspondingly arranged in the space below the needle roller 1. The pressure roller 2 can rotate actively or be set as a driven roller;

[0047] The transmission roller group 01 is used to control the transmission direction and tension of the film material 0. It includes a guide roller and a tension roller. The positions of the relevant rollers are set corresponding to the pressure roller 2 so that the film material 0 is attached to the surface (surface layer) of the pressure roller 2 at a certain wrap angle;

[0048] Furthermore, the mat assembly 3 includes a first mat 33 that is attached to the surface of the pressure-bearing assembly and is movably arranged to fit the pressure-bearing assembly. This serves to isolate the needles and protect the pressure-bearing assembly and the punching assembly, preventing the needles from piercing the film 0 and contacting the pressure roller 2. In this embodiment, the mat assembly 3 also includes a roller assembly for driving the mat to move, including an unwinding roller 31 and a rewinding roller 32 for rewinding and unwinding the mat, and a guide roller assembly 34 for adjusting the direction of mat transport. The first mat is preferably kept relatively stationary relative to the film to reduce wear. The protective film can be made of commercially available conventional film materials, such as PET, PP, PS, PE, and the like, with a thickness of 10-1000 μm.

[0049] Independently set movable pads can provide better protection for punched components and facilitate maintenance and replacement.

[0050] In addition, the roller body such as the needle roller can be assembled on the roller spacing adjustment device to adjust the roller body height, thereby adjusting the gap between the needle rollers, and conveniently adjusting the puncture depth. The above-mentioned adjustment device belongs to the existing well-known structure and will not be described in detail. When the needle roller 1 punctures again, the thickness of the film material can be combined in advance, and the puncture depth can be further adjusted in conjunction with the feeler gauge.

[0051] In order to facilitate the punching of membrane materials, especially polymer substrates, a heating component 4 is provided corresponding to the needles of the needle roller 1 to increase the needle temperature, thereby softening the membrane material during puncture and facilitating penetration.

[0052] like Figure 1 The heating assembly 4 includes a plurality of heat pipes 41 arranged around the outer edge of the needle roller 1. The heat pipes 41 can be arranged axially and fixed at intervals on the arc-shaped cover.

[0053] Further references Figure 2 To protect the membrane surface and further improve the puncture effect, the mat assembly 3 also includes a second mat 35 that is movably arranged along with the membrane 0. This second mat 35 is positioned on the side of the membrane closest to the needle roller 1 and maintains a certain contact angle with the pressure roller 2 via a corresponding guide roller assembly, thereby maintaining contact. The thickness of the second mat 33 is preferably between 20 and 2000 μm. Due to the provision of the second mat 35, the second mat 35 is pre-pierced during acupuncture. This helps position the needle tip, preventing it from vibrating and further deforming during the puncture process. Furthermore, it partially removes foreign matter from the needle tip during the puncture process.

[0054] Some embodiments of the present application also disclose a conductive film prepared based on the film material after the above-mentioned roller punching device, such as a metal conductive layer coated on the surface based on evaporation as in the prior art; part of the metal material will be deposited on the wall of the formed micropores, and a local accommodating cavity can be formed as a space to accommodate air, thereby reducing the vacuum hardening situation.

[0055] The conductive layer material is selected from metal materials such as gold, silver, copper, aluminum, nickel, chromium, etc.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings or conventionally expressed in the prior art, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0057] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0058] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0059] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A roller punching device, characterized in that: include: Punching component, used to perforate the membrane material; The pressure-bearing component is used to provide support for the membrane material during roller punching; The transmission roller group includes a guide roller and a tension roller, which is used to control the transmission direction and tension of the film material. The position of the relevant roller body corresponds to the setting of the pressure roller so that the film material is attached to the surface of the pressure roller at a certain wrap angle; And, the cushion material assembly includes a first cushion material that is attached to the surface of the pressure-bearing assembly and is movably arranged.

2. The roller punching device according to claim 1, characterized in that: The punching assembly comprises a rotatable needle roller, the outer periphery of which is provided with pricking needles which are arranged on a bracket through bearings.

3. The roller punching device according to claim 1, wherein: The pressure-bearing component is configured as a pressure roller, which is correspondingly arranged in the space below the needle roller; the pressure roller is an active roller or a driven roller.

4. The roller punching device according to claim 1, wherein: The mat material assembly also includes a roller group for driving the mat material to move, including an unwinding roller and a winding roller for unwinding and winding the mat material, and a guide roller group for adjusting the transmission direction of the mat material.

5. The roller punching device according to claim 1, wherein: The first cushion material and the membrane material remain relatively still, and the thickness thereof is set to 10-1000 μm.

6. The roller punching device according to claim 1, wherein: A heating component is provided corresponding to the needles of the needle roller.

7. The roller punching device according to claim 6, wherein: The heating assembly comprises a plurality of heat pipes which are arranged around the outer edge of the needle roller. The heat pipes can be arranged along the axial direction and fixed on the arc-shaped cover at intervals.

8. The roller punching device according to any one of claims 1 to 7, characterized in that: The mat material assembly includes a second mat material movably arranged corresponding to the film material. The second mat material is arranged on the side of the film material close to the needle roller and maintains a certain contact angle with the pressure roller through the relevant guide roller group.

9. The roller punching device according to claim 8, characterized in that: The thickness of the second cushion material is greater than that of the first cushion material; the thickness of the second cushion material is 20-2000 μm.

10. A conductive film, characterized in that: The invention comprises a base film prepared based on the roller punching device as claimed in claim 9, and a conductive layer is formed on the surface of the base film.

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