Composite conductive film

Abstract

The utility model relates to a composite conductive film which comprises a supporting layer and a metal layer loaded on the supporting layer, the composite conductive film comprises two main surfaces which are oppositely arranged, and at least one main surface of the composite conductive film is subjected to roughness treatment to form a high-roughness area. And the high-roughness area is arranged along the length direction of the composite conductive film. According to the utility model, the main surface is subjected to roughness treatment to form the high-roughness area, and the friction coefficient of the high-roughness area is increased, so that each section is prevented from displacement and misalignment due to the influence of the friction force of the high-roughness area in the transportation process after the composite conductive film is wound into a coil to form a columnar object, and the service life of the columnar object is prolonged. The technical problem that the composite conductive film is wrinkled in the transportation process is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a composite conductive film. Background Art

[0002] Composite conductive films are mainly used in secondary batteries. Their main function is to collect the current generated by the active materials in the battery in order to form a larger current for external output.

[0003] The composite conductive film needs to be transported after production, and the transportation of the composite conductive film is usually to roll the composite conductive film into a roll to form a column for transportation. However, during the transportation process, the various cross-sections of the composite conductive film rolled into a roll will be displaced due to transportation bumps and other reasons. After the displacement occurs, the rolled composite conductive film will have misaligned edges. Due to the misaligned edges, the composite conductive film will be wrinkled. When the composite conductive film is subsequently coated, it will cause uneven coating, affecting the coating effect and ultimately affecting the production quality of the product.

[0004] In summary, there is an urgent need to provide a composite conductive film that will not have misalignment during transportation. Utility Model Content

[0005] The utility model aims to provide a composite conductive film which will not have the phenomenon of misalignment during transportation.

[0006] The above-mentioned purpose is achieved through the following technical solution: a composite conductive film, comprising a support layer and a metal layer loaded on the support layer, the composite conductive film comprising two main surfaces arranged opposite to each other, at least one main surface of the composite conductive film being roughened to form a high roughness area, and the high roughness area being arranged along the length direction of the composite conductive film.

[0007] The main surface of the composite conductive film is the surface of the upper and lower outermost layers. When the metal layer is at the upper and lower outermost layers, the surface of the metal layer is the main surface of the composite conductive film. When other functional layers are added to the metal layer of the composite conductive film, the surfaces of the other functional layers are the main surface of the composite conductive film. The high roughness here refers to an area with a higher roughness than the area of ​​the main surface of the composite conductive film that has not been roughened. The ratio of the width of the high roughness to the overall width of the composite conductive film can be set according to the actual application situation, and is also related to the roughness (friction) of the high roughness area, which can ensure that the composite conductive film will not have misaligned edges after being rolled up.

[0008] A further technical solution is that the high roughness area is arranged on both sides of the main surface. In this way, the main surface of the composite conductive film is divided into a high roughness area, a low roughness area (without roughness treatment) and a high roughness area along the width direction, thereby increasing the roughness of both sides of the main surface of the composite conductive film and increasing the friction force.

[0009] A further technical solution is that the high roughness areas and the low roughness areas that have not been roughened on the main surface of the composite conductive film are alternately arranged along the width direction of the composite conductive film.

[0010] A further technical solution is that the roughness of the high roughness area is 0.07-0.15, and the roughness of the low roughness area is 0.04-0.07.

[0011] A further technical solution is that the sum of the widths of the high roughness areas is greater than the sum of the widths of the low roughness areas. It should be noted that the sum of the widths of the high roughness areas here refers to the sum of the widths of all roughness areas of the composite conductive film along its width direction, and similarly, the sum of the widths of the low roughness areas refers to the sum of the widths of all low roughness areas of the composite conductive film along its width direction.

[0012] A further technical solution is that a bonding layer for increasing the bonding force between the metal layer and the supporting layer is provided on the supporting layer. The bonding layer can be a nickel alloy, nickel metal, titanium alloy, titanium metal, copper alloy, aluminum alloy, or a non-metallic material such as aluminum oxide, silicon nitride or silicon carbide or polyethylene glycol. Of course, the supporting layer can also be surface treated to increase the surface tension of the supporting layer, and the surface treatment method can be corona treatment, plasma treatment, etc.

[0013] A further technical solution is that the support layer is a PP film, a PE film, a PET film, or a BOPP film. The support layer is preferably a PP film because the PP film (polypropylene) is a type of polyolefin, and there are only carbon-carbon bonds in its molecular chain. In addition to being corroded by concentrated sulfuric acid and concentrated nitric acid, it is relatively stable to various other chemical reagents, and it is also extremely difficult to break the chain and degrade, and has extremely strong chemical stability. Therefore, when used in a composite conductive film, it can extend the service life of the battery.

[0014] A further technical solution is that the metal layer is copper, aluminum, copper alloy or aluminum alloy.

[0015] Compared with the prior art, the composite conductive film of the utility model forms a high roughness area on the main surface through roughness treatment, thereby increasing the friction coefficient of this area. After the composite conductive film is rolled into a roll to form a column, the various cross sections are affected by the friction of the high roughness area during transportation, preventing them from shifting and misaligning, thereby solving the technical problem of wrinkles in the composite conductive film during transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings constituting a part of the present invention 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 improper limitation on the present invention.

[0017] Figure 1 This is a schematic structural diagram of a composite conductive film involved in one embodiment of the utility model;

[0018] Figure 2 and Figure 3 They are respectively schematic diagrams of the distribution of high roughness areas and low roughness areas on the main surface of a composite conductive film involved in one embodiment of the utility model;

[0019] Figure 4 It is a schematic structural diagram of a composite conductive film involved in another embodiment of the utility model.

[0020] In the figure:

[0021] 1 Support layer 2 Metal layer 3 Adhesive layer 4 High roughness area

[0022] 5 Low roughness area DETAILED DESCRIPTION

[0023] The present invention is described in detail below in conjunction with the accompanying drawings. The description in this section is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present invention. In addition, those skilled in the art can make corresponding combinations of the features in the embodiments and in different embodiments of the present invention according to the description of this document.

[0024] The utility model embodiments are as follows, referring to Figures 1 to 3 A composite conductive film comprises a support layer 1 and a metal layer 2 loaded on the support layer 1, wherein the composite conductive film comprises two main surfaces arranged opposite to each other, at least one main surface of the composite conductive film is roughened to form a high roughness area 4, and the high roughness area 4 is arranged along the length direction of the composite conductive film.

[0025] The main surface of the composite conductive film is the surface of the upper and lower outermost layers. When the metal layer 2 is at the upper and lower outermost layers, the surface of the metal layer 2 is the main surface of the composite conductive film. When other functional layers are added to the metal layer 2 of the composite conductive film, the surfaces of the other functional layers are the main surface of the composite conductive film. The high roughness here refers to an area with a higher roughness than the area of ​​the main surface of the composite conductive film that has not been roughened. The ratio of the width of the high roughness to the overall width of the composite conductive film can be set according to the actual application situation, and is also related to the roughness (friction) of the high roughness area 4, which can ensure that the composite conductive film will not have misaligned edges after being rolled up.

[0026] Based on the above embodiment, in another embodiment of the utility model, as Figure 2, the high roughness area 4 is arranged on both sides of the main surface. In this way, the main surface of the composite conductive film is divided into the high roughness area 4, the low roughness area 5 (without roughness treatment) and the high roughness area 4 along the width direction, increasing the roughness of both sides of the main surface of the composite conductive film and increasing the friction force.

[0027] Based on the above embodiment, in another embodiment of the utility model, as Figure 3 The high roughness areas 4 and the low roughness areas 5 that have not been roughened on the main surface of the composite conductive film are alternately arranged along the width direction of the composite conductive film.

[0028] On the basis of the above embodiment, in another embodiment of the present invention, the roughness of the high roughness area 4 is 0.07-0.15, and the roughness of the low roughness area is 0.04-0.07.

[0029] On the basis of the above embodiment, in another embodiment of the utility model, the sum of the widths of the high roughness regions 4 is greater than the sum of the widths of the low roughness regions. It should be noted that the sum of the widths of the high roughness regions 4 here refers to the sum of the widths of all roughness regions of the composite conductive film along its width direction, and similarly, the sum of the widths of the low roughness regions refers to the sum of the widths of all low roughness regions of the composite conductive film along its width direction.

[0030] Based on the above embodiment, in another embodiment of the utility model, as Figure 4 The support layer 1 is provided with a bonding layer 3 for increasing the bonding force between the metal layer 2 and the support layer 1. The bonding layer 3 can be a nickel alloy, nickel metal, titanium alloy, titanium metal, copper alloy, aluminum alloy, or a non-metallic material such as aluminum oxide, silicon nitride or silicon carbide or polyethylene glycol. Of course, the support layer 1 can also be surface treated to increase the surface tension of the support layer 1. The surface treatment method can be corona treatment, plasma treatment, etc.

[0031] Based on the above embodiment, in another embodiment of the utility model, the support layer 1 is a PP film, a PE film, a PET film, or a BOPP film. The support layer 1 is preferably a PP film because the PP film (polypropylene) is a kind of polyolefin, and there are only carbon-carbon bonds in its molecular chain. In addition to being corroded by concentrated sulfuric acid and concentrated nitric acid, it is relatively stable to various other chemical reagents, and it is also extremely difficult to break the chain and degrade, and the chemical stability is extremely strong. Therefore, when used in a composite conductive film, it can extend the service life of the battery.

[0032] Based on the above embodiment, in another embodiment of the present invention, the metal layer 2 is copper, aluminum, copper alloy or aluminum alloy.

[0033] In order to better understand the technical solution of the utility model, a method of the utility model is disclosed herein. Taking the high roughness setting on the metal layer 2 as an example, first take the support layer 1, unwind the support layer 1 into the vacuum coating equipment, such as the magnetron sputtering coating equipment or the vacuum evaporation coating equipment, and then turn on the power to coat a metal layer 2 on the upper and lower surfaces of the support layer 1. The vacuum coating equipment includes an unwinding device, a film walking device, a roughness treatment device and a winding device. The roughness treatment device can be a corona treatment device or an ion source treatment device. The roughness treatment device is set in front of the winding roller of the winding device to process the edges of both sides of the main surface of the metal-plated composite conductive film. In this way, high roughness areas 4 will be formed on the edges of both sides of the rolled composite conductive film.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A composite conductive film, comprising a support layer and a metal layer supported on the support layer, wherein the composite conductive film comprises two main surfaces arranged opposite to each other, characterized in that: At least one main surface of the composite conductive film is roughened to form a high roughness area, and the high roughness area is arranged along the length direction of the composite conductive film.

2. The composite conductive film according to claim 1, characterized in that: The high roughness areas are provided on both sides of the main surface.

3. The composite conductive film according to claim 2, characterized in that: The high roughness areas and the low roughness areas which have not been roughened on the main surface of the composite conductive film are alternately arranged along the width direction of the composite conductive film.

4. The composite conductive film according to claim 3, characterized in that: The roughness of the high roughness area is 0.07-0.15, and the roughness of the low roughness area is 0.04-0.

07.

5. The composite conductive film according to claim 3, characterized in that: The sum of the widths of the high roughness areas is greater than the sum of the widths of the low roughness areas.

6. The composite conductive film according to any one of claims 1 to 5, characterized in that: The support layer is provided with a bonding layer for increasing the bonding force between the metal layer and the support layer.

7. The composite conductive film according to claim 6, characterized in that: The support layer is a PP film, a PE film, a PET film, or a BOPP film.

8. The composite conductive film according to claim 6, characterized in that: The metal layer is copper, aluminum, copper alloy or aluminum alloy.

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