Composite foil shaping device

Abstract

The invention provides a composite foil shaping device which comprises an unwinding device, a shaping device, a shaping device and a shaping device. The winding device is used for winding the foil material; the conveying device is arranged between the unwinding device and the winding device, and the conveying device is used for conveying the foil; the two sets of shaping devices are arranged on the upper side and the lower side of the foil correspondingly and used for shaping the upper surface and the lower surface of the foil; the dust collecting devices are divided into two groups, and the two groups of dust collecting devices are separately arranged on the left side of the shaping device and are used for collecting dust generated during shaping of the shaping device; by introducing the constant-gap cutting knife and the metal powder collecting system in the preparation process of the composite current collector, the flattening treatment of the surface of the foil is realized, so that the performance of the composite current collector and the yield of the battery preparation process are improved.

Description

Technical Field

[0001] The invention relates to the field of lithium ion batteries, and in particular to a composite foil shaping device. Background Art

[0002] The preparation process of the composite current collector adopts an efficient roll-to-roll process. First, a polymer film such as polyethylene terephthalate (PET) or polypropylene (PP) is selected as the substrate. Then, the surface of the substrate is treated by plasma treatment technology to increase the surface roughness and surface energy, thereby improving the bonding with the metal layer. Then, nano-aluminum oxide (AlOx) or nano-silicon oxide (SiOx) is deposited on the surface of the substrate as an intermediate strengthening layer using physical vapor deposition technology. This step significantly enhances the bonding between the substrate and the metal layer through mechanical interlocking and chemical bonding. After that, a metal aluminum layer is deposited on the intermediate layer by vacuum evaporation and other methods to form a conductive layer. Multiple depositions may be required to achieve the required thickness and conductivity. During the preparation process, the surface square resistance, mechanical properties, surface composition and micromorphology of the composite current collector are strictly controlled and characterized to ensure that it meets the requirements of battery manufacturing. Finally, electrolyte compatibility tests, electrochemical performance tests and safety performance tests are carried out to verify the performance of the composite current collector in actual battery applications to ensure its high efficiency, stability and safety. This continuous production method not only ensures the quality and performance of the composite current collector, but also achieves high efficiency and low cost for large-scale manufacturing.

[0003] However, in actual operation, it is difficult to avoid the deposition of large metal nodules on the surface of the prepared composite foil due to the splashing of large metal particles or the condensation of metal vapor, resulting in uneven foil surface. During the coating process, especially at a low surface load, the slit of the coating head is very likely to scratch the tape and break the tape, seriously affecting the preparation process and yield of the battery.

[0004] Therefore, we propose a composite foil shaping device to solve the problem of uneven foil surface. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings existing in the prior art. In order to achieve the above purpose, the present invention adopts the following technical solutions: A composite foil shaping device comprises: an unwinding device, the unwinding device is used for unwinding the foil; a winding device, the winding device is used for winding the foil; a conveying device, the conveying device is arranged between the unwinding device and the winding device, and the conveying device is used for conveying the foil; a shaping device, the shaping device comprises two groups, the two groups of shaping devices are arranged on the upper and lower sides of the foil, and are used for shaping the upper and lower surfaces of the foil; a dust collecting device, the dust collecting device comprises two groups, the two groups of dust collecting devices are arranged on the left side of the shaping device, and are used for collecting dust generated when the shaping device is shaping; the present invention realizes the flattening treatment of the foil surface by introducing a constant gap cutter and a metal powder collection system in the preparation process of the composite current collector, thereby improving the performance of the composite current collector and the yield of the battery preparation process.

[0006] Further preferably, the shaping device includes a drive controller, a shaping knife, an adjustment drive and a slide rail, the slide rail is fixedly mounted on a shaping device frame, the shaping knife is connected to the slide rail via a slider, and an adjustment drive is provided on both sides of the slide rail, the adjustment drive is used to adjust the height and angle of the shaping knife, and the adjustment drive is connected to the drive controller via a control line.

[0007] Further preferably, the conveying device includes an upper shaping back roller, a lower shaping back roller and a guide roller, the upper shaping back roller is located below the foil, the lower shaping back roller is located above the foil, and several guide rollers for adjustment are arranged between the unwinding device, the upper shaping back roller, the lower shaping back roller and the conveying device.

[0008] Further preferably, the shaping device includes a shaping device 1 and a shaping device 2, wherein the shaping device 1 is located above the foil and is used to shape the upper surface of the foil, and the shaping device 2 is located below the foil and is used to shape the lower surface of the foil.

[0009] Further preferably, the dust collecting device includes a dust collecting box, a dust collecting pipe and a dust collecting plate, one side of the dust collecting box is connected to the dust collecting pipe, the other end of the dust collecting pipe is connected to the dust collecting plate, and the dust collecting plate is located in the left front of the shaping knife.

[0010] Further preferably, the dust collecting device is fixedly mounted on a frame of the shaping device.

[0011] Further preferably, the distance between the shaping knife and the surface of the foil is 1-500 μm.

[0012] Further preferably, the adjustment angle of the shaping knife is 0-90°.

[0013] Further preferably, online detection devices are installed on both sides of the conveying device.

[0014] Further preferably, the online detection device is a laser scanner or a visual detection system.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention adopts an innovative flattening process, by adding a constant gap cutting knife during the roll-to-roll winding and unwinding process, the metal nodules on the surface of the composite foil are flattened and shaped to achieve flattening of the foil surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the process equipment of the present invention; Figure 2 is a schematic diagram of a shaping device of the present invention; Figure 3 It is a schematic diagram of the structure of the dust collecting device in the present invention.

[0017] In the figure: unwinding device 1, foil material 2, upper shaping back roller 3, dust collecting device 1 4, shaping device 1 5, lower shaping back roller 6, dust collecting device 2 7, shaping device 2 8, winding device 9, dust collecting box 41, dust collecting pipe 42, dust suction disc 43, drive controller 51, shaping knife 52, height adjustment drive 53, slide rail 54, angle adjustment drive 55. DETAILED DESCRIPTION

[0018] 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.

[0019] Reference Figure 1-Figure 3 , a composite foil shaping device, comprising: An unwinding device 1, wherein the unwinding device 1 is used for unwinding the foil material 2; a rewinding device 9, wherein the rewinding device 9 is used for rewinding the foil material 2; a conveying device, wherein the conveying device is arranged between the unwinding device 1 and the rewinding device 9, and wherein the conveying device is used for conveying the foil material 2; a shaping device, wherein the shaping device comprises two groups, wherein the two groups of shaping devices are respectively arranged on the upper and lower sides of the foil material 2, and are used for shaping the upper and lower surfaces of the foil material 2; a dust collecting device, wherein the dust collecting device comprises two groups, wherein the two groups of dust collecting devices are respectively arranged on the left side of the shaping device, and are used for collecting dust generated during shaping by the shaping device.

[0020] In the embodiment: the foil 2 is unwound by the unwinding device 1, and is reeled by the reeling device 9. The foil 2 is conveyed between the unwinding device 1 and the reeling device 9 by the conveying device. During the conveying process, the surface of the foil 2 is shaped by the shaping device (the protruding metal nodules are removed by the cutting knife), and the metal powder generated during the cutting process is collected by the dust collecting device. The present invention achieves a flattening treatment of the foil surface by introducing a constant gap cutting knife and a metal powder collection system in the preparation process of the composite current collector, thereby improving the performance of the composite current collector and the yield of the battery preparation process.

[0021] The shaping device includes a drive controller 51, a shaping knife 52, an adjustment drive 53 and a slide rail 54. The slide rail 54 is fixedly installed on the shaping device frame. The shaping knife 52 is connected to the slide rail 54 through a slider. Adjustment drives 53 are provided on both sides of the slide rail 54. The adjustment drive 53 is used to adjust the height and angle of the shaping knife 52. The adjustment drive 53 is connected to the drive controller 51 through a control line. The distance between the shaping knife 52 and the surface of the foil 2 is 1-500μm, and the adjustment angle of the shaping knife 52 is 0-90°.

[0022] The shaping device includes a shaping device 1 5 and a shaping device 2 8. The shaping device 1 5 is located above the foil 2 and is used to shape the upper surface of the foil 2. The shaping device 2 8 is located below the foil 2 and is used to shape the lower surface of the foil 2.

[0023] In the embodiment: the shaping knife 52 can slide up and down on the slide rail 54 through a slider, and the shaping knife 52 can be adjusted in a wide range in the height direction. There are two adjustment drives 53, which are distributed on both sides of the slide rail 54 and controlled by a drive controller 51. The height and angle of the shaping knife 52 can be adjusted by adjusting the drive 53. The height of the shaping knife 52 can be adjusted according to the thickness and surface condition of the foil material to ensure that the metal nodules can be effectively removed while avoiding excessive cutting; the angle of the shaping knife 52 can be set to 0-90 degrees, which is the angle relative to the roller cut surface. The adjustment of the angle can optimize the cutting effect and ensure the flatness of the foil surface.

[0024] The conveying device includes an upper shaping back roller 3, a lower shaping back roller 6 and a guide roller. The upper shaping back roller 3 is located below the foil 2, and the lower shaping back roller 6 is located above the foil 2. Several guide rollers for adjustment are arranged between the unwinding device 1, the upper shaping back roller 3, the lower shaping back roller 6 and the conveying device 9.

[0025] In the embodiment: the conveying device is composed of two shaping back rollers and several guide rollers; the two shaping back rollers are divided into an upper shaping back roller 3 and a lower shaping back roller 6, and the upper shaping back roller 3 and the lower shaping back roller 6 are respectively arranged on the upper and lower sides of the foil 2, and the upper end of the upper shaping back roller 3 and the lower end of the lower shaping back roller 6 are respectively provided with shaping devices, and the protruding metal nodules are removed by the cutting knife by adjusting the distance between the shaping knife 52 and the shaping back roller. The height of the shaping knife 52 can be adjusted according to the thickness and surface condition of the foil to ensure that the metal nodules can be effectively removed while avoiding excessive cutting.

[0026] In the embodiment, guide rollers are arranged between the unwinding device 1 and the upper shaping back roller 3, between the upper shaping back roller 3 and the lower shaping back roller 6, and between the lower shaping back roller 6 and the winding device 9, and the direction and tension of the foil 2 during the transmission process are adjusted by the guide rollers.

[0027] The dust collecting device includes a dust collecting box 41, a dust collecting pipe 42 and a dust collecting disc 43. One side of the dust collecting box 41 is connected to the dust collecting pipe 42, and the other end of the dust collecting pipe 42 is connected to the dust collecting disc 43. The dust collecting disc 43 is located in the left front of the shaping knife 52. The dust collecting device is fixedly mounted on the frame of the shaping device.

[0028] In the embodiment: a dust collecting component that generates negative pressure is installed in the dust collecting box 41, and the dust collecting component sucks metal powder into the dust collecting box 41 through the dust collecting disc 43. The dust collecting device is installed on the left side of the shaping device 1 5 and the shaping device 2 8. When the shaping device shapes the surface of the foil 2, the metal powder generated during the cutting process is collected by the dust collecting device, which effectively prevents the metal powder from polluting the environment.

[0029] On-line detection devices are installed on both sides of the conveying device, and the on-line detection devices are laser scanners or visual detection systems.

[0030] In the embodiment: during the entire shaping process, the surface condition of the foil needs to be monitored in real time to ensure that the shaping effect reaches the expected result; for example, the flatness of the foil surface is monitored by a laser scanner or a visual inspection system; the flattened foil needs to undergo a strict quality inspection to ensure that its surface flatness reaches the expected standard; this step is crucial to ensure the performance of the battery current collector.

[0031] In one embodiment: Threading of composite foil: First, the composite foil with a thickness of 3-20 microns is installed on the unwinding device and passes through a series of guide rollers in preparation for the shaping process. The width and tension of the composite foil need to be precisely controlled to ensure stability and consistency during the shaping process.

[0032] The shaping knife 52 on the shaping device 5: The composite foil first passes through the shaping knife 52 on the shaping device 5. The design of this shaping knife 52 allows precise cutting of one side of the foil. The knife gap can be set in the range of 1-500 microns. This range can be adjusted according to the thickness and surface condition of the foil to ensure that the metal nodules can be effectively removed while avoiding excessive cutting. The angle of the shaping knife 52 can be set to 0-90 degrees, which is the angle relative to the roller cut surface. The adjustment of the angle can optimize the cutting effect and ensure the flatness of the foil surface.

[0033] The shaping knife 52 on the shaping device 2 8: After being processed by the upper surface shaping knife, the composite foil then enters the lower surface shaping knife 52 to shape the lower surface; similar to the upper surface shaping knife, the knife gap of the lower surface shaping knife is also set to 1-500 microns to ensure effective removal of the metal tumor on the other side of the foil; the angle of the shaping knife can also be adjusted to 0-90 degrees to meet different shaping requirements.

[0034] Control of shaping effect: During the entire shaping process, the surface condition of the foil needs to be monitored in real time to ensure that the shaping effect meets the expectations. This may require the use of online inspection equipment, such as laser scanners or visual inspection systems, to monitor the flatness of the foil surface.

[0035] Collection of metal powder: The metal powder generated during the shaping process is collected by a dust collecting device. The dust collecting device can effectively prevent the metal powder from polluting the environment, and also provide the possibility for the recovery and reuse of metal powder.

[0036] Rewinding: After double-sided shaping, the composite foil is guided to the rewinding device and neatly rolled up. During the rewinding process, the foil tension and winding speed need to be well controlled to ensure that the rolled foil maintains good flatness and is convenient for subsequent use.

[0037] Through this fine shaping process, the surface flatness of the composite foil is significantly improved, thus providing high-quality current collector materials for the subsequent battery preparation process. This process not only improves the performance and safety of the battery, but also helps to improve the overall yield of battery manufacturing.

[0038] The invention realizes the flattening treatment of the foil surface by introducing a constant gap cutter and a metal powder collecting system in the preparation process of the composite current collector, thereby improving the performance of the composite current collector and the yield rate of the battery preparation process.

Claims

1. A composite foil shaping device, characterized in that: include: An unwinding device, the unwinding device is used to unwind the foil; A winding device, wherein the winding device is used to wind the foil; A conveying device, the conveying device is arranged between the unwinding device and the rewinding device, and the conveying device is used to convey the foil; A shaping device, wherein the shaping device comprises two groups, and the two groups of shaping devices are respectively arranged on the upper and lower sides of the foil material, and are used for shaping the upper and lower surfaces of the foil material; The dust collecting device comprises two groups, and the two groups of dust collecting devices are respectively arranged on the left side of the shaping device, and are used to collect dust generated by the shaping device during shaping.

2. A composite foil shaping device according to claim 1, characterized in that: The shaping device includes a drive controller, a shaping knife, an adjustment drive and a slide rail. The slide rail is fixedly installed on the shaping device frame. The shaping knife is connected to the slide rail through a slider. Adjustment drives are provided on both sides of the slide rail. The adjustment drive is used to adjust the height and angle of the shaping knife. The adjustment drive is connected to the drive controller through a control line.

3. A composite foil shaping device according to claim 1, characterized in that: The conveying device includes an upper shaping back roller, a lower shaping back roller and a guide roller. The upper shaping back roller is located below the foil, and the lower shaping back roller is located above the foil. Several guide rollers for adjustment are arranged between the unwinding device, the upper shaping back roller, the lower shaping back roller and the conveying device.

4. A composite foil shaping device according to claim 1, characterized in that: The shaping device comprises shaping device 1 and shaping device 2, wherein shaping device 1 is located above the foil material and is used to shape the upper surface of the foil material, and shaping device 2 is located below the foil material and is used to shape the lower surface of the foil material.

5. A composite foil shaping device according to claim 2, characterized in that: The dust collecting device comprises a dust collecting box, a dust collecting pipe and a dust collecting disc. One side of the dust collecting box is connected to the dust collecting pipe, and the other end of the dust collecting pipe is connected to the dust collecting disc. The dust collecting disc is located in the left front of the shaping knife.

6. A composite foil shaping device according to claim 1, characterized in that: The dust collecting device is fixedly mounted on the frame of the shaping device.

7. A composite foil shaping device according to claim 2, characterized in that: The distance between the shaping knife and the surface of the foil material is 1-500 μm.

8. A composite foil shaping device according to claim 2, characterized in that: The adjustment angle of the shaping knife is 0-90°.

9. A composite foil shaping device according to claim 1, characterized in that: Online detection devices are installed on both sides of the conveying device.

10. The composite foil shaping device according to claim 1, characterized in that: The online detection device is a laser scanner or a visual detection system.

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