Carbon slurry strip coating device for current collector

Abstract

The utility model discloses a current collector carbon slurry coating strip device which comprises a coating machine charging tray, a gravure roller and a slurry dispersing device, the gravure roller is rotatably arranged at an opening in the upper part of the coating machine charging tray, and the slurry dispersing device is arranged in the coating machine charging tray; the coating machine tray comprises an upper area and a lower area; the upper area is a strip area, and the gravure roller can extend into the strip area when rotating; the lower area is a dispersion isolation area, and the dispersion isolation area is provided with a strip device bottom with a V-shaped section; the slurry dispersing device is arranged in the dispersing isolation area and comprises a base and a stirring paddle, one end of the stirring paddle is mounted on the base and can rotate along the base, and the other end of the stirring paddle is a dispersing head. According to the utility model, the strip material work of the gravure roller is limited in the strip material area at the upper part. The dispersion isolation area disperses agglomerated slurry particles deposited at the bottom when the gravure roller above carries materials to work, the requirement for shutdown cleaning of a material tray of the coating machine can be reduced, and the working efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a current collector carbon coating slurry conveying device. Background Technology

[0002] Current collectors play a crucial role in lithium-ion batteries by collecting and transporting electrons. Commonly used current collectors include metal foil current collectors and composite current collectors. Composite current collectors have a central polymer interlayer and metal layers on both sides. When current collectors are used as carriers for loading battery active materials, the smoothness of the current collector metal material results in low adhesion between the battery active material and the current collector metal material. Therefore, the current solution is to first coat the surface of the current collector with a carbon-coated slurry to obtain a carbon-coated current collector, and then load the battery active material onto the carbon-coated current collector.

[0003] The preparation of carbon-coated current collectors typically involves using a gravure roller to coat the surface of the current collector. The carbon coating slurry is a mixed slurry formed by uniformly dispersing various substances, such as conductive powder, dispersant, resin, and solvent. The carbon coating slurry is generally placed in the tray of a coating machine, with a gravure roller positioned above it for carrying the slurry. During use, the carbon coating slurry may aggregate and re-adhere, depositing into larger slurry particles. If the gravure roller carries these larger particles onto the surface of the current collector, it will cause uneven carbon coating, resulting in electrode quality defects. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned problems by providing a current collector carbon coating slurry feeding device, thereby reducing electrode quality issues caused by carbon coating slurry feeding.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A current collector for conveying carbon coating slurry includes a coating machine tray, a gravure roller, and a slurry dispersing device; the gravure roller is rotatably disposed at the upper opening of the coating machine tray, and the slurry dispersing device is disposed inside the coating machine tray;

[0007] The coating machine tray includes an upper region and a lower region; the upper region is a material feeding area, into which the gravure roller can extend when rotating; the lower region is a dispersion and isolation area, which has a V-shaped bottom for the material feeding device.

[0008] The slurry dispersion device is located in the dispersion isolation zone. The slurry dispersion device includes a base and a stirring paddle. One end of the stirring paddle is mounted on the base and can rotate along the base. The other end of the stirring paddle is a dispersion head.

[0009] To optimize the above technical solution, the specific measures also include:

[0010] The gravure roller has a rotating shaft in the middle, which connects to fixed structures at both ends. The height of the rotating shaft and the fixed structures is adjustable to adjust the depth into the material zone when the gravure roller rotates.

[0011] The base of the slurry dispersion device is located on the side wall of the dispersion isolation zone. The base is provided with a rotating shaft and several stirring paddles. The stirring paddles are connected to the rotating shaft, and the rotating shaft is connected to a drive mechanism that enables the rotating shaft to rotate.

[0012] Furthermore, the dispersing head is connected to the end of the stirring paddle; the dispersing head includes a tree-shaped structure, which comprises a shaft and several branch-shaped dispersing ends, each branch-shaped dispersing end being distributed in an arc shape on the shaft of the dispersing head.

[0013] As a preferred embodiment, the dispersing head further includes a dispersing disk, the middle part of which is connected to the end of the shaft of the dispersing head, and the dispersing disk has a plurality of convex tooth structures.

[0014] Furthermore, the convex tooth structure includes a first convex tooth structure located on the side of the dispersion disk facing the tree structure and a second convex tooth structure located on the side away from the tree structure.

[0015] The bottom of the conveying device is a V-shaped trough, and the slurry dispersing devices are arranged in rows along the side wall of the V-shaped trough.

[0016] As a preferred embodiment, a preset safety distance is maintained between the lower edge of the material conveying area and the upper edge of the V-shaped cross-section of the dispersion isolation area, which is a V-shaped groove.

[0017] Furthermore, the inner wall of the coating machine's tray is marked with a level marking line for the carbon coating slurry holding volume.

[0018] Furthermore, the bottom side wall of the conveyor belt is provided with a slurry discharge valve.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] To prevent the gravure roller from carrying up larger slurry particles, this invention divides the coating machine's tray into an upper and lower area. The upper area is the material-carrying zone, into which the gravure roller extends during rotation. The lower area is a dispersion and isolation zone, featuring a V-shaped material-carrying device at the bottom that confines the gravure roller's material-carrying operation to the upper area. While the upper gravure roller is carrying material, the dispersion and isolation zone disperses any agglomerated slurry particles deposited at the bottom, preventing waste due to long-term accumulation. The evenly dispersed slurry can be returned to the upper area for reuse. This invention reduces the need for downtime for cleaning the coating machine's tray, improving work efficiency.

[0021] In this invention, a preset safety distance is maintained between the lower edge of the material carrying area and the upper edge of the V-shaped groove of the dispersion isolation area. By setting the preset safety distance H, the distance between the slurry range of the material carrying area of ​​the gravure roller and the bottom easily deposited area is increased, so as to avoid the larger agglomerated slurry particles at the bottom being carried out and coated onto the surface of the current collector when the gravure roller rotates, thus preventing electrode quality defects.

[0022] The slurry dispersion device of this invention can fully disperse the agglomerated slurry particles at the bottom. The rotation of the stirring paddle can drive the agglomerated slurry particles in the surrounding area to be stirred with a large amplitude and force. The dispersion head at the end of the stirring paddle can further disperse and break up the agglomerated slurry particles while the stirring paddle is rotating. The tree-shaped structure and the toothed structure can compress the agglomerated slurry particles, so as to obtain the uniformly dispersed slurry required for carbon coating of the current collector in terms of particle fineness. Attached Figure Description

[0023] Figure 1 : Schematic diagram of the coating machine's material tray.

[0024] Figure 2 : A schematic diagram of the structure of the current collector carbon coating slurry conveying device of this utility model.

[0025] Figure 3 Schematic diagram of the slurry dispersion device.

[0026] Figure 4 Schematic diagram of the distribution of slurry dispersion devices.

[0027] Figure 5 : Schematic diagram of the structure of the dispersion head.

[0028] In the diagram: 1-Coating machine tray, 2-Bottom of the V-shaped conveying device, 3-Slurry dispersion device, 4-Conveying zone, 5-Dispersion isolation zone, 6-Base, 7-Agitator, 8-Dispersion head, 9-Gravure roller, 10-Rotating shaft, 11-Shaft, 12-Denial dispersion end, 13-Dispersion disc, 14-First tooth structure, 15-Second tooth structure, 16-Preset safety distance, 17-Slurry discharge valve. Detailed Implementation

[0029] The present invention will be further described in detail below through embodiments, but it should not be construed as the scope of the present invention being limited to the following embodiments. All technologies implemented based on the present invention fall within the scope of the present invention.

[0030] In the description of this utility model, it should also be noted that:

[0031] The orientations or positional relationships described herein are based on the relationships shown in the accompanying drawings and are only for the purpose of facilitating the description of this utility model and simplifying the description. They are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] This utility model provides a current collector for conveying carbon-coated slurry, such as... Figure 1 , Figure 2 As shown, it includes a coating machine tray 1, a gravure roller 9, and a slurry dispersing device 3; the gravure roller 9 is rotatably disposed at the upper opening of the coating machine tray 1, and the slurry dispersing device 3 is disposed inside the coating machine tray 1.

[0034] The coating machine tray 1 includes an upper region and a lower region; the upper region is the material carrying area 4, which can be extended into when the gravure roller 9 rotates; the lower region is the dispersion isolation area 5, which has a V-shaped material carrying device bottom 2.

[0035] Figure 2The upper and lower regions are shown separately for illustrative purposes. In reality, the upper and lower regions are connected. After being evenly dispersed, the carbon coating slurry in the coating machine tray 1 tends to agglomerate and re-adhere, forming larger slurry particles that settle at the bottom. To prevent the gravure roller 9 from carrying up these larger slurry particles, this invention divides the coating machine tray 1 into an upper and lower region. The dispersion isolation zone 5 has a V-shaped bottom 2 for the material carrying device, which restricts the material carrying operation of the gravure roller 9 to the upper material carrying area 4.

[0036] Preferably, a preset safety distance of 16 is maintained in height between the lower edge of the material conveying zone 4 and the upper edge of the V-shaped groove of the dispersion isolation zone 5, as shown in the example. Figure 2 The H marked in the figure is the preset safety distance 16. By setting the preset safety distance 16H, the distance between the slurry range of the gravure roller 9 and the bottom easy deposition area is increased, so as to avoid the larger agglomerated slurry particles at the bottom being carried out and coated onto the surface of the current collector when the gravure roller 9 rotates, causing electrode quality defects.

[0037] The gravure roller 9 has a rotating shaft in the middle, which connects to the fixed structures at both ends. In some embodiments, the height of the rotating shaft and the fixed structure can be adjusted to adjust the depth to which the gravure roller 9 extends into the material zone 4 when it rotates.

[0038] The slurry dispersion device 3 is located in the dispersion isolation zone 5. While the upper gravure roller 9 is carrying the slurry, the dispersion isolation zone 5 disperses the agglomerated slurry particles deposited at the bottom, thus avoiding the waste of slurry caused by long-term deposition and accumulation, which would render the slurry unusable. The slurry that has been dispersed evenly can be turned over and returned to the upper area for reuse. This invention can reduce the need to stop and clean the coating machine tray 1, thereby improving work efficiency.

[0039] like Figure 3 As shown, the slurry dispersion device 3 includes a base 6 and a stirring paddle 7. One end of the stirring paddle 7 is mounted on the base 6 and can rotate along the base 6, while the other end of the stirring paddle 7 is a dispersion head 8.

[0040] The base 6 of the slurry dispersion device 3 is located on the side wall of the dispersion isolation zone 5. The base 6 is provided with a rotating shaft 10 and several stirring paddles 7. The stirring paddles 7 are connected to the rotating shaft 10, and the rotating shaft 10 is connected to a drive mechanism that enables the rotating shaft 10 to rotate.

[0041] like Figure 5 As shown, the dispersing head 8 is connected to the end of the stirring paddle 7; the dispersing head 8 includes a tree-shaped structure, which includes a shaft 11 and several tree-shaped dispersing ends 12, and each tree-shaped dispersing end 12 is distributed in an arc shape on the shaft 11 of the dispersing head 8.

[0042] The dispersing head 8 also includes a dispersing disk 13, the middle of which is connected to the end of the shaft 11 of the dispersing head 8, and the dispersing disk 13 has several convex tooth structures.

[0043] The tooth structure includes a first tooth structure 14 located on the side of the dispersion disk 13 facing the tree structure and a second tooth structure 15 located on the side away from the tree structure.

[0044] The slurry dispersion device 3 can fully disperse the agglomerated slurry particles at the bottom. As the stirring paddle 7 rotates, the agglomerated slurry particles in the area around the stirring paddle 7 can be driven as a whole and stirred with a large amplitude and force. The dispersion head 8 at the end of the stirring paddle 7 can further disperse and break up the agglomerated slurry particles while the stirring paddle 7 is rotating. The tree-shaped structure and the toothed structure can compress the agglomerated slurry particles to obtain a uniformly dispersed slurry required for carbon coating of the current collector in terms of particle fineness.

[0045] The bottom of the conveyor belt device is a V-shaped trough, such as... Figure 4 As shown, in some embodiments, the slurry dispersion device 3 is arranged in rows along the side wall of the tank with a V-shaped cross-section; this structure replaces the conventional rectangular tank structure, and the slurry dispersion device 3 arranged in rows along the side wall of the V-shaped tank ensures the dispersion of slurry in various regions of the tank.

[0046] In some embodiments, the inner wall of the coating machine tray 1 is provided with marking lines indicating the amount of carbon coating slurry, which facilitates the control of the amount of carbon coating slurry in the coating machine tray 1.

[0047] In some embodiments, a slurry discharge valve 17 is provided on the bottom side wall of the conveying device to facilitate thorough cleaning. The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Any simple modifications, equivalent substitutions, and improvements made by those skilled in the art to the above embodiments without departing from the scope of the technical solution of this utility model, based on its technical essence, shall still fall within the protection scope of this utility model.

Claims

1. A current collector for conveying carbon-coated slurry, characterized in that: It includes a coating machine tray, a gravure roller, and a slurry dispersing device; the gravure roller is rotatably mounted at the upper opening of the coating machine tray, and the slurry dispersing device is located inside the coating machine tray; The coating machine tray includes an upper region and a lower region; the upper region is a material feeding area, into which the gravure roller can extend when rotating; the lower region is a dispersion and isolation area, which has a V-shaped bottom for the material feeding device. The slurry dispersion device is located in the dispersion isolation zone. The slurry dispersion device includes a base and a stirring paddle. One end of the stirring paddle is mounted on the base and can rotate along the base. The other end of the stirring paddle is a dispersion head.

2. The current collector carbon coating slurry conveying device according to claim 1, characterized in that: The gravure roller has a rotating shaft in the middle, which connects to fixed structures at both ends. The height of the rotating shaft and the fixed structures is adjustable to adjust the depth into the material zone when the gravure roller rotates.

3. The current collector carbon coating slurry conveying device according to claim 1, characterized in that: The base of the slurry dispersion device is located on the side wall of the dispersion isolation zone. The base is provided with a rotating shaft and several stirring paddles. The stirring paddles are connected to the rotating shaft, and the rotating shaft is connected to a drive mechanism that enables the rotating shaft to rotate.

4. The current collector carbon coating slurry conveying device according to claim 1, characterized in that: The dispersing head is connected to the end of the stirring paddle; the dispersing head includes a tree-shaped structure, which includes a shaft and several tree-shaped dispersing ends, each tree-shaped dispersing end being distributed in an arc shape on the shaft of the dispersing head.

5. The current collector carbon coating slurry conveying device according to claim 4, characterized in that: The dispersing head also includes a dispersing disk, the middle part of which is connected to the end of the shaft of the dispersing head, and the dispersing disk has a plurality of convex tooth structures.

6. The current collector carbon coating slurry conveying device according to claim 5, characterized in that: The convex tooth structure includes a first convex tooth structure located on the side of the dispersion disk facing the tree structure and a second convex tooth structure located on the side away from the tree structure.

7. The current collector carbon coating slurry conveying device according to claim 1, characterized in that: The bottom of the conveying device is a V-shaped trough, and the slurry dispersing devices are arranged in rows along the side wall of the V-shaped trough.

8. The current collector carbon coating slurry conveying device according to claim 1, characterized in that: A preset safety distance is maintained between the lower edge of the material conveying area and the upper edge of the V-shaped groove of the dispersion isolation area.

9. The current collector carbon coating slurry conveying device according to claim 1, characterized in that: The inner wall of the coating machine's tray is marked with a level marking line for the carbon coating slurry holding volume.

10. The current collector carbon coating slurry conveying device according to claim 1, characterized in that: The bottom side wall of the conveyor belt device is equipped with a slurry discharge outlet valve.

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