Strip oil removal device and lithium strip rolling system for lithium battery

Abstract

The application provides a strip oil removal device capable of removing oil during rolling and a lithium strip rolling system for lithium batteries. The strip oil removal device comprises a conveying roller, a wiping member and a liquid supply assembly. The conveying roller is used for conveying a to-be-wiped strip. The wiping member is arranged opposite to the conveying roller. The to-be-wiped strip passes between the wiping member and the conveying roller. The wiping member is made of a liquid-permeable material. The liquid supply assembly is connected with the wiping member and supplies oil removal liquid to the wiping member. The strip oil removal device and the lithium strip rolling system for lithium batteries can remove the oil film on the back of the protective film of the strip, thereby avoiding the slipping of the metal material during rolling, reducing the generation of a large number of defective products, saving manpower, material resources and time, and ensuring the qualified rate of the rolling production of the metal material.

Description

Technical Field

[0001] This invention relates to the field of strip degreasing devices, and particularly to a strip degreasing device and a lithium strip rolling system for lithium batteries. Background Technology

[0002] Lithium metal batteries are considered the most promising power battery system due to their significant advantages of high specific energy and high specific power. With technological advancements, especially the widespread adoption of wearable electronic devices and the rapid development of new energy vehicles, the demand for increasingly thinner batteries is increasing, while simultaneously requiring higher energy densities. Lithium metal anode materials possess extremely high theoretical capacity (3800 mAh / g), making them an ideal choice for improving battery energy density.

[0003] However, commercially available lithium strips for lithium batteries are generally quite thick, exceeding 150μm. This is mainly because lithium metal is soft, highly ductile, and has low specific strength, resulting in uneven thickness and large thickness tolerances, directly affecting the performance and energy density of lithium batteries. Therefore, with the increasing demands for energy density in lithium metal batteries, achieving ultra-thin lithium strips and uniform thickness has become crucial. For example, in the fabrication of solid-state lithium batteries, lithium strips are laminated onto both sides of a copper film as the production material, further emphasizing the need for ultra-thin lithium. Tianjin Zhongneng Lithium Industry uses vacuum extrusion molding to prepare lithium strips, improving the dimensional control precision of the manufacturing process. However, this method suffers from problems such as high mold losses due to reaction and difficulty in controlling thickness under ultra-thin requirements. Therefore, in existing technologies, obtaining ultra-thin lithium strips with a thickness ≤50μm is difficult through extrusion molding and requires rolling.

[0004] During the process of rolling lithium strip into thin material, PET protective film coated with oil needs to be introduced on both sides. At the same time, the surface of the rolling roll has been finely ground to achieve a near-mirror finish. When the material is fed from the back of the PET protective film coated with oil, a certain oil film will also form. When it comes into contact with the smooth rolling roll, it is very easy for slippage to occur, which seriously affects the quality of lithium strip rolling. Summary of the Invention

[0005] Therefore, it is necessary to provide a strip degreasing device and a lithium strip rolling system for lithium batteries that can degrease the strip during the rolling process.

[0006] To solve the above-mentioned technical problems, the present invention provides a strip degreasing device, including a conveyor roller, a wiping component, and a liquid supply assembly. The conveyor roller is used to convey the strip to be wiped. The wiping component is disposed opposite to the conveyor roller. The strip to be wiped passes between the wiping component and the conveyor roller. The wiping component is made of a liquid-permeable material. The liquid supply assembly is connected to the wiping component and supplies degreasing liquid to the wiping component.

[0007] Preferably, the strip degreasing device further includes a winding assembly and an unwinding assembly. The wiping element is made of a strip of flexible material and is connected to the winding assembly and the unwinding assembly. The winding assembly and the unwinding assembly are used to drive the wiping element to move.

[0008] Preferably, the strip degreasing device further includes a fixed bracket, the winding assembly includes a winding shaft and a winding drive device, the unwinding assembly includes an unwinding shaft and an unwinding drive device, the winding shaft, the unwinding shaft and the conveying roller are all installed in the fixed bracket, the axial directions of the winding shaft, the unwinding shaft and the conveying roller are parallel, and they are arranged in a triangular layout on a plane perpendicular to the axial direction, and the two ends of the wiping member are respectively wound on the winding shaft and the unwinding shaft.

[0009] Preferably, the liquid supply assembly includes a solution box and a liquid supply drive. The solution box is used to store degreasing liquid, and the wiping member covers the outside of the solution box. The solution box is provided with a permeation channel for the degreasing liquid to penetrate into the wiping member. The liquid supply drive is connected to the solution box and is used to apply pressure toward the conveying roller to the solution box and the wiping member.

[0010] Preferably, the liquid supply assembly further includes a solution supply pump, a distributor, and multiple distribution pipes. One end of the multiple distribution pipes is connected to the distributor, and the other end is connected to the solution box and distributed at intervals. The distributor is connected to the solution supply pump, and the solution supply pump supplies degreasing liquid to the solution box through the distributor and the distribution pipes.

[0011] Preferably, the strip degreasing device further includes an oil mist absorption hood and a sealing hood. The oil mist absorption hood is used to absorb the degreasing liquid volatiles released by the wiping element and / or solution box. The sealing hood is sealed to the outside of the solution supply pump and is connected to the oil mist absorption hood through a pipe. The sealing hood is used to allow the degreasing liquid volatiles generated by the solution supply pump to enter the oil mist absorption hood through the pipe. The liquid supply assembly also includes a liquid storage cotton, which is disposed in the solution box.

[0012] Preferably, the strip degreasing device further includes a strip conveying assembly and a controller. The strip conveying assembly includes multiple conveying rollers and a tension detector. The tension detector is used to detect the tension of the strip conveyed by the conveying rollers. The controller is electrically connected to the tension detector and the liquid supply drive, and is used to control the pressure applied to the solution box by the liquid supply drive according to the tension detected by the tension detector.

[0013] Preferably, the strip degreasing device further includes a winding assembly and an unwinding assembly. The wiping element is made of a strip of flexible material and is connected to the winding assembly and the unwinding assembly. The winding assembly and the unwinding assembly are used to drive the wiping element to move. The strip degreasing device further includes a fixed bracket. The winding assembly includes a winding shaft and a winding drive device. The unwinding assembly includes an unwinding shaft and an unwinding drive device. The winding shaft, the unwinding shaft, the wiping element, and the conveying roller are all installed in the fixed bracket. The axial directions of the winding shaft, the unwinding shaft, and the conveying roller are parallel and arranged in a triangular layout on a plane perpendicular to the axial direction. The two ends of the wiping element are respectively wound on the winding shaft and the unwinding shaft. The solution box is disposed between the winding shaft, the unwinding shaft, and the conveying roller. The winding drive device and the unwinding drive device are automatically driven at timed intervals or manually driven.

[0014] Preferably, an electrostatic eliminator is provided on the input side and / or output side of the conveyor roller.

[0015] The present invention also provides a lithium strip rolling system for lithium batteries, comprising a first strip conveying system, a second strip conveying system, and rolls, wherein the first strip conveying system and the second strip conveying system are respectively used to convey the first strip and the second strip to the rolls, and the rolls are used to press the first strip and the second strip together. The invention is characterized in that the first strip conveying system and / or the second strip conveying system are provided with the strip degreasing device for degreasing the first strip and / or the second strip.

[0016] The strip degreasing device and lithium strip rolling system for lithium batteries provided by this invention can remove the oil film on the back of the strip protective film, thereby avoiding slippage during metal rolling, preventing the generation of a large number of defective products, and avoiding the waste of manpower, material resources and time, thus ensuring the pass rate of metal rolling production. Attached Figure Description

[0017] The above and other objects, features, and advantages of the invention will become clearer through a more detailed description of the preferred embodiments illustrated in the accompanying drawings. The same reference numerals denote the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of the invention.

[0018] Figure 1 A schematic diagram of the strip degreasing device provided by the present invention for degreasing;

[0019] Figure 2 This is a schematic diagram of the first angle structure of the strip degreasing device provided by the present invention;

[0020] Figure 3 This is a schematic diagram of the second angle structure of the strip degreasing device provided by the present invention;

[0021] Figure 4 A schematic diagram of the sealing cover and solution supply pump in the strip degreasing device provided by the present invention;

[0022] Figure 5 A schematic diagram of the strip degreasing device (with an oil mist absorption hood and a sealing hood) provided by the present invention;

[0023] Figure 6 A schematic diagram of the strip degreasing device (with an oil mist absorption hood) provided by the present invention;

[0024] Figure 7 A schematic diagram of the strip degreasing device (with conveyor rollers and tension detector) provided by the present invention;

[0025] Figure 8 A schematic diagram of the lithium strip rolling system for lithium batteries provided by the present invention. Detailed Implementation

[0026] To facilitate understanding of the present invention, a more comprehensive description will be given below with reference to the accompanying drawings.

[0027] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to and integrated with the other component, or there may be an intervening component present. The terms "mounted," "one end," "the other end," and similar expressions used in this document are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] refer to Figure 1This invention provides a strip degreasing device comprising a conveyor roller 1, a wiping element 2, and a liquid supply assembly 3. The conveyor roller 1 conveys the strip 4 to be wiped. The wiping element 2 is positioned opposite to the conveyor roller 1 and is made of a liquid-permeable material, such as a lint-free cloth, enabling the degreasing liquid to penetrate and remove oil from the strip 4. The liquid supply assembly 3 is connected to the wiping element 2 and supplies the degreasing liquid to it. The protective film of the strip 4 to be wiped can be PET protective film or other strip materials. The strip 4 passes between the wiping element 2 and the conveyor roller 1. The liquid supply assembly 3 supplies the degreasing liquid to the wiping element 2, which then rubs and wipes the strip 4 to achieve the degreasing effect. The strip degreasing device provided in this embodiment can remove oil from the strip 4 to be wiped, thereby preventing slippage of the metal material during rolling, thus avoiding the generation of a large number of defective products during rolling, resulting in a waste of manpower, resources, and time, and ensuring the pass rate of metal material rolling production.

[0030] refer to Figure 1 and Figure 2 In a preferred embodiment, the wiping member 2 is a liquid-permeable tape made of liquid-permeable material. The tape degreasing device further includes a winding assembly 5 and an unwinding assembly 6. The wiping member 2 is connected to the winding assembly 5 and the unwinding assembly 5. The unwinding assembly 6 is used to unwind the liquid-permeable tape, and the winding assembly 5 is used to wind the liquid-permeable tape, so that the winding assembly 5 and the unwinding assembly 6 can drive the wiping member to move, thereby achieving a better degreasing effect on the protective film of the wiping tape 4.

[0031] refer to Figure 1 and Figure 2 In a preferred embodiment, the strip degreasing device further includes a fixed bracket 7, a winding assembly 5 including a winding shaft 51 and a winding drive device 52, and an unwinding assembly 6 including an unwinding shaft 61 and an unwinding drive device 62. The winding shaft 6, the unwinding shaft 5, the wiping element 2, and the conveyor roller 1 are all mounted in the fixed bracket 7. The axial directions of the winding shaft 6, the unwinding shaft 5, and the conveyor roller 1 are parallel, and they are arranged in a triangular layout on a plane perpendicular to the axial direction. The two ends of the wiping element 2 are respectively wound around the winding shaft 6 and the unwinding shaft 5, which are used to wind and unwind the wiping element 2. The position of the wiping element 2 can be adjusted by setting the timed rotation of the winding shaft 6 and the unwinding shaft 5 in conjunction with the operating speed of the equipment. This avoids oil accumulation on the wiping cloth and achieves a better degreasing effect.

[0032] refer to Figure 1-3In a preferred embodiment, the liquid supply assembly 3 includes a solution box 31 and a liquid supply drive component. The solution box 31 stores the degreasing liquid, and the wiping component 2 covers the outside of the solution box 31. The solution box 31 is provided with permeation channels for the degreasing liquid to penetrate into the wiping component 2. The degreasing liquid in the solution box 31 permeates into the wiping component 2 through the permeation channels. A liquid storage cotton (sponge) is provided inside the solution box 31, which can absorb approximately 1.9L of the solution, acting as a buffer. Before starting the equipment, the liquid storage cotton can be soaked in the degreasing liquid to reduce the amount of degreasing liquid supplied to the pump during initial use.

[0033] refer to Figure 1 The liquid supply drive unit is connected to the solution box 31 and is used to apply pressure towards the conveyor roller 1 to the solution box 31 and the wiping device 2. It can control the pressure of the solution box 31 and the wiping device 2 on the PET protective film, ensuring that the belt tension of the PET protective film is not affected. The liquid supply drive unit includes a pressure plate 36 and a cylinder 35. The pressure plate 36 is driven by the cylinder 35 and can provide closed-loop feedback with the tension detector 11 of the system. The pressure plate 36 can adjust the opening of the electro-proportional valve in real time according to the tension feedback of the system, thereby controlling the pressure of the cylinder 35. This controls the pressure of the solution box 31 in contact with the PET protective film material, so as not to affect the belt tension of the system.

[0034] refer to Figure 3-4 In a preferred embodiment, the liquid supply assembly 3 further includes a solution supply pump 81, a distributor 32, and multiple distribution pipes 33. One end of each distribution pipe 33 is connected to the distributor 32, and the other end is connected to the solution container 31. The solution supply pump 81 can be set independently and has a capacity of 400 ml. The open setting parameters of the solution supply pump include: single supply duration, supply interval time, and supply frequency. The supply pump 81 is connected to the distributor 32 through a pipeline. The supply pump 81 pumps the degreasing liquid to the distributor 32, and then the liquid flows into the solution container 31 through the multiple distribution pipes 33, so that the degreasing liquid enters the solution container 31 evenly.

[0035] refer to Figure 4-6 In a preferred embodiment, the strip degreasing device further includes an oil mist absorption hood 9 and a sealing hood 82. A solution supply pump 81 is placed inside the sealing hood 82. The sealing hood 82 allows the volatile degreasing liquid generated by the solution supply pump 81 to enter the oil mist absorption hood 9 through a pipe, thus maintaining a slight negative pressure inside the sealing hood 82 and preventing the gas emitted by the solution supply pump 81 from leaking out. The oil mist absorption hood 9 absorbs the volatile degreasing liquid released from the wiping component 2 and / or the solution box 31, preventing gas leakage. Therefore, the entire strip degreasing device provided in this embodiment will not leak gas, avoiding any impact on the workshop environment.

[0036] refer to Figure 7In a preferred embodiment, the strip degreasing device further includes a strip conveying assembly and a controller. The strip conveying assembly includes multiple conveying rollers 10, a tension detector 11, and a speed detector 12. The tension detector 11 is used to detect the tension of the strip conveyed by the conveying rollers 10, and the speed detector 12 is used to detect the conveying speed of the strip. The tension detector 11 and the speed detector 12 are connected to the controller, and the liquid supply drive is also connected to the controller. By adaptively adjusting the liquid supply drive through the tension detector 11 and the speed detector 12, the pressure of the solution box 31 and the wiping device 2 on the PET protective film can be controlled, forming a closed-loop tension control system.

[0037] refer to Figure 1 In a preferred embodiment, the solution box 31 is disposed between the take-up shaft 22, the unwind shaft 21 and the conveyor roller 1. The take-up drive device and the unwind drive device are automatically driven at regular intervals or manually driven to adjust and replace the position of the wiping component 2 in accordance with the operating speed of the equipment, so as to avoid the accumulation of the wiping component 2.

[0038] refer to Figure 7 In a preferred embodiment, an electrostatic eliminator 13 is provided on the input side and / or output side of the conveyor roller 1. The electrostatic eliminator 13 can effectively remove static electricity generated by the friction between the cleanroom cloth and the film material.

[0039] refer to Figure 7-8 This invention discloses a lithium strip rolling system for lithium batteries, comprising a first strip conveying system, a second strip conveying system 200, and rolls 102. The first strip conveying system conveys a PET protective film, and the second strip conveying system conveys the lithium strip (metal strip) to be rolled. The first and second strip conveying systems respectively feed the PET protective film and the lithium strip to the rolls. The first strip conveying system includes an unwinding mechanism 101 and a strip degreasing device for removing the oil film on the back of the PET protective film. The rolls are used to roll and press the strip 4 (PET protective film) to be wiped and the metal strip 201 (lithium strip). The strip degreasing device is located in the direction of material feeding to the rolls. The lithium strip rolling system for lithium batteries provided by this invention removes the oil film on the back of the PET protective film before it enters the rolls, which can effectively avoid slippage during lithium strip rolling and ensure the yield of lithium strip rolling.

[0040] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this specification, the references to terms such as "preferred embodiment," "another embodiment," "other embodiment," or "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0042] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A lithium strip rolling system for lithium batteries, characterized in that, It includes a first strip conveying system, a second strip conveying system, and rolls. The first strip conveying system and the second strip conveying system are respectively used to convey the first strip and the second strip to the rolls. The rolls are used to press the first strip and the second strip together. The first strip conveying system and / or the second strip conveying system are provided with strip degreasing devices for degreasing the first strip and / or the second strip. The strip degreasing device includes a conveyor roller, a wiping component, and a liquid supply assembly. The conveyor roller is used to convey the strip to be wiped. The wiping component is arranged opposite to the conveyor roller. The strip to be wiped passes between the wiping component and the conveyor roller. The wiping component is made of a liquid-permeable material. The liquid supply assembly is connected to the wiping component and supplies degreasing liquid to the wiping component. The liquid supply assembly includes a solution box and a liquid supply drive. The solution box is used to store degreasing liquid. The wiping member is covered on the outside of the solution box. The solution box is provided with a permeation channel for the degreasing liquid to penetrate into the wiping member. The liquid supply drive is connected to the solution box and is used to apply pressure toward the conveying roller to the solution box and the wiping member. The liquid supply assembly also includes a solution supply pump, a distributor, and multiple distribution pipes. One end of each distribution pipe is connected to the distributor, and the other end is connected to the solution box and they are spaced apart. The distributor is connected to the solution supply pump, and the solution supply pump supplies degreasing liquid to the solution box through the distributor and the distribution pipes.

2. The lithium strip rolling system as described in claim 1, characterized in that, The strip degreasing device further includes a winding assembly and an unwinding assembly. The wiping element is made of a strip of flexible material and is connected to the winding assembly and the unwinding assembly. The winding assembly and the unwinding assembly are used to drive the wiping element to move.

3. The lithium strip rolling system as described in claim 2, characterized in that, The strip degreasing device also includes a fixed bracket. The winding assembly includes a winding shaft and a winding drive device. The unwinding assembly includes an unwinding shaft and an unwinding drive device. The winding shaft, unwinding shaft, and conveyor roller are all installed in the fixed bracket. The axial directions of the winding shaft, unwinding shaft, and conveyor roller are parallel and arranged in a triangular pattern on a plane perpendicular to the axial direction. The two ends of the wiping member are respectively wound on the winding shaft and the unwinding shaft.

4. The lithium strip rolling system as claimed in claim 1, wherein the strip degreasing device further comprises an oil mist absorption hood and a sealing hood, the oil mist absorption hood being used to absorb the degreasing liquid volatiles released by the wiping component and / or the solution box, the sealing hood being sealed to the outside of the solution supply pump, and the sealing hood being connected to the oil mist absorption hood via a pipe, the sealing hood being used to allow the degreasing liquid volatiles generated by the solution supply pump to enter the oil mist absorption hood through the pipe, and the liquid supply assembly further comprises a liquid storage cotton, the liquid storage cotton being disposed in the solution box.

5. The lithium strip rolling system as described in claim 1, characterized in that, The strip degreasing device further includes a strip conveying assembly and a controller. The strip conveying assembly includes multiple conveying rollers and a tension detector. The tension detector is used to detect the tension of the strip conveyed by the conveying rollers. The controller is electrically connected to the tension detector and the liquid supply drive, and is used to control the pressure applied to the solution box by the liquid supply drive according to the tension detected by the tension detector.

6. The lithium strip rolling system as described in claim 1, characterized in that, The strip degreasing device further includes a winding assembly and an unwinding assembly. The wiping element is made of a strip of flexible material and is connected to the winding assembly and the unwinding assembly. The winding assembly and the unwinding assembly are used to drive the wiping element to move. The strip degreasing device also includes a fixed bracket. The winding assembly includes a winding shaft and a winding drive device. The unwinding assembly includes an unwinding shaft and an unwinding drive device. The winding shaft, the unwinding shaft, the wiping element, and the conveying roller are all installed in the fixed bracket. The axial directions of the winding shaft, the unwinding shaft, and the conveying roller are parallel and arranged in a triangular layout on a plane perpendicular to the axial direction. The two ends of the wiping element are respectively wound on the winding shaft and the unwinding shaft. The solution box is disposed between the winding shaft, the unwinding shaft, and the conveying roller. The winding drive device and the unwinding drive device are automatically driven at timed intervals or manually driven.

7. The lithium strip rolling system as described in claim 1, characterized in that, The input and / or output sides of the conveyor roller are equipped with static eliminators.

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