Die for blade coating and film making on surface of lithium strip

Abstract

A die for blade coating and film making on the surface of a lithium strip is characterized in that supports are fixed to the left side and the right side of a base respectively, a scraper assembly is fixed to the top of the base in a sliding mode, the scraper assembly adjusts a gap to a target value through a gap adjusting assembly, and slurry to be coated can be adjusted to the target thickness to be coated on the corresponding lithium strip in a blade coating mode. And a coating with a certain thickness is formed. When surface film making modification of air sensitive materials such as a lithium strip is carried out in inert atmosphere such as a glove box, aiming at the current situations that the operation space is limited and the thickness of blade coating film making needs to be adjusted and controlled, the die can be used in the limited space, convenient cutting of the lithium strip is achieved, the blade coating film making process of different thicknesses of the surface of the lithium strip is met, the structure is simple, and operation is convenient.

Description

Technical Field

[0001] The utility model relates to the field of film-making molds, in particular to a mold used for film-making by scraping and coating on the surface of a lithium strip. Background Art

[0002] With the continuous development of electric vehicles, drones, and portable electronic devices, the energy storage density of traditional lithium-ion batteries can no longer meet the growing practical needs. In recent years, lithium metal anodes have gradually become one of the most promising and most popular anode materials due to their high theoretical capacity and low electrode potential. However, lithium metal anodes are still facing the risk of uncontrollable growth of lithium dendrites, which seriously affects the cycle life and safety performance of lithium metal batteries, and hinders their development and application in actual production. At present, modifying the surface of lithium metal has become one of the effective strategies to improve the electrochemical properties of lithium metal anodes. Among them, the surface scraping film method is more feasible in small-scale laboratory scientific research.

[0003] Usually, the coating of traditional positive and negative electrode sheets is carried out in a flat-plate coating machine, and the commercial thickness adjustment scrapers configured therein mostly adopt a spiral transmission with a spring force reset structure at both ends, which has a backlash error, and the service life of the spring is very limited, and there is a hidden danger that the springs at both ends are not completely synchronized. In addition, due to the extremely active chemical properties of lithium metal materials, all operations related to surface film modification need to be carried out in the inert atmosphere of the glove box with a suitable coating mold. At present, there are still some problems when using general commercial flat-plate coating machines for scraping the surface of lithium strips, such as the obvious lack of space in the common laboratory glove box cavity, and the structure of the film scraper using spring force to achieve thickness adjustment needs to be further improved. There is still a lack of an integrated device for convenient access and cutting of coiled materials such as lithium strips.

[0004] Therefore, there is an urgent need to design a lithium metal surface scraping mold that is easy to cut and has adjustable film thickness to adapt to the scraping film forming process in limited spaces such as glove boxes. Utility Model Content

[0005] The utility model mainly proposes a mold for scraping and coating the surface of lithium ribbon to address the technical problems such as limited operating space and the need to control the thickness of the scraping film when modifying the surface of air-sensitive materials such as lithium ribbon in an inert atmosphere such as a glove box. The mold can be used in a limited space and can realize convenient cutting of lithium ribbon, meeting the scraping and coating process of different thicknesses on the surface of lithium ribbon. It has a simple structure and is easy to operate.

[0006] The utility model discloses a technical scheme is: a mould for lithium belt surface doctoring film preparation, characterized in that the left and right sides of base are fixed with support respectively, and the top of base is slidably fixed with scraper assembly, and the gap of scraper assembly is adjusted to target value through gap adjusting assembly, and the slurry to be coated can be scraped to the corresponding lithium belt, and the coating of certain thickness is formed.

[0007] Further improvement: the upper part of the support is provided with a material rotating shaft, the lithium belt passes through the material rotating shaft and is connected with the scraper assembly, and the stable transmission function is realized.

[0008] Further improvement: the gap adjusting assembly includes a screw transmission screw rod and a dial gauge, and the screw transmission screw rod and the dial gauge are fixed on the top of the scraper assembly respectively, the scraper assembly includes a scraper, a scraper seat, and a scraper support, wherein the scraper is mounted and fixed on the right side surface of the scraper seat, the scraper is fixed with the scraper support on the front and back sides, the top plates of the front and back scraper supports are connected, and the top plate of the scraper seat and the top plate of the scraper support are respectively provided with a screw hole and a dial gauge mounting hole, so that the screw transmission screw rod and the dial gauge can be installed.

[0009] Further improvement: the scraper assembly includes a scraper, and the scraper is fixed with a scraper support on the front and back sides, and the bottom of the scraper support is provided with an L-shaped clamping strip, correspondingly, the top of the base is provided with an L-shaped clamping groove, the L-shaped clamping strip is matched with the L-shaped clamping groove, and sliding fixation is realized.

[0010] Further improvement: the lower part of the scraper support is fixed with a sliding rod, a movable sleeve that can slide forward and backward is sleeved on the outer wall of the sliding rod, and a portable blade that can rotate is fixed outside the movable sleeve.

[0011] Finally: the left and right sides of the top of the base are provided with fixed clamps.

[0012] Compared with the prior art, the product has the advantages that: it is suitable for the doctoring process on the surface of active materials (lithium belt or lithium foil) that depend on inert atmosphere, the relatively small structure can meet the use in limited inert atmosphere space, the doctoring thickness can be adjusted by the differential screw transmission structure to realize the position adjustment of the scraper, the accuracy can reach 10 microns, the function of doctoring different thickness of slurry on the surface of materials is realized, meanwhile, the material rotating shaft structure can realize the storage and portable use of raw materials, the cutting function of the portable blade can effectively prevent the waste of materials and reduce the complexity of operation. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 It is a structural schematic view of the utility model,

[0014] Fig. 2 It is an explosion structural schematic view of the utility model,

[0015] Fig. 3This is a schematic diagram of the explosion structure of the utility model.

[0016] In the figure, 1. base, 2. bracket, 3. scraper assembly, 4. gap adjustment assembly, 5. material shaft, 6. fixing clip, 7. spiral drive screw, 8. dial indicator, 9. scraper, 10. scraper bracket, 11. L-shaped clip, 12. L-shaped slot, 13. slide rod, 14. movable sleeve, 15. portable blade, 16. scraper seat, 17. bolt. DETAILED DESCRIPTION

[0017] The following is a further detailed description of the implementation methods of the present utility model patent in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present utility model patent, but cannot be used to limit the scope of the present utility model patent. In the description of the present utility model patent, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model patent and simplifying the description, and does 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 cannot be understood as a limitation on the present utility model patent. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0018] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model in specific contexts.

[0019] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0020] according to Figs. 1 to 3 A mold for scraping and coating the surface of a lithium strip. The practical focus of the new model is that brackets 2 are fixed on the left and right sides of the base 1, which are usually connected and fixed with bolts 17. A scraper assembly 3 is slidably fixed on the top of the base 1. The scraper assembly 3 adjusts the gap to the target value through the gap adjustment assembly 4. The slurry to be coated can be adjusted to the target thickness and scraped onto the corresponding lithium strip to form a coating of a certain thickness.

[0021] The upper portion of the bracket 2 is equipped with a material shaft 5, through which the lithium ribbon passes before connecting to the scraper assembly 3, ensuring stable transport. Mounting clips 6 are located on the left and right sides of the top of the base 1 to secure the lithium ribbon to the base 1. The adjustment assembly 4 includes a helical drive screw 7 and a dial indicator 8, each secured to the top of the scraper assembly 3. The dial indicator 8 measures the height between the scraper assembly 3 and the lithium ribbon. Once the reading is obtained, the user adjusts the height between the scraper assembly 3 and the lithium ribbon using the helical drive screw 7. The scraper assembly 3 includes the following main components: a scraper 9, a scraper seat 16, and a scraper bracket 10. The scraper 9 is mounted and fixed on the right side of the scraper seat 16. There are scraper brackets 10 on the front and rear sides of the scraper 9. The front and rear scraper brackets 10 are connected by a top plate. The top plates of the scraper seat 16 and the scraper bracket 10 are respectively provided with screw holes and meter mounting holes, so that the spiral drive screw 7 and the dial indicator 8 can be installed. The bottom of the scraper bracket 10 is provided with an L-shaped card strip 11. Correspondingly, the top of the base 1 is provided with an L-shaped card slot 12. The L-shaped card strip 11 matches the L-shaped card slot 12, so that the scraper bracket 10 can slide left and right on the base 1 for easy user adjustment. A slide bar 13 is fixed to the lower part of the scraper bracket 10. The outer wall of the slide bar 13 is covered with a movable sleeve 14 that can slide back and forth. A rotatable portable blade 15 is fixed to the outside of the movable sleeve 14. When the portable blade 15 is not working, it can be fixed to the side of the movable sleeve 14 in a parallel direction.

[0022] To use this product, the user first unwinds the lithium foil to the desired length and lays it flat on the surface of the base 1, securing both ends with the fixing clips 6. From the left end, place the scraper assembly 3 into the slot. Adjust the scraper 9 so that it contacts the lithium foil and there is no gap between it and the bottom surface. The dial indicator reads zero. Based on the desired slurry thickness, adjust the gap between the scraper 9 and the base 1 using the screw adjustment screw 7 to the target thickness, determining the height of the scraper 9. Next, place the slurry to be applied parallel to the outside of the scraper assembly 3. Manually slide the scraper assembly 3 outward to apply the desired coating thickness. After the slurry film forms and dries, cut the applied material into the desired size using the sliding portable blade 15. If the thickness of the applied coating needs to be changed, adjust the gap between the scraper 9 and the base 1. The scraper assembly 3 can be removed via the L-shaped clip 11 and L-shaped slot 12 for easy cleaning. When not in use, the portable blade 15 can be fixed parallel to the side of the movable sleeve 14.

Claims

1. A mold for scraping and coating the surface of a lithium strip, characterized in that Brackets are fixed on the left and right sides of the base respectively. A scraper assembly is slidably fixed on the top of the base. The scraper assembly adjusts the gap to the target value through the gap adjustment assembly. The slurry to be coated can be adjusted to the target thickness and scraped onto the corresponding lithium strip to form a coating of a certain thickness. The gap adjustment assembly includes a spiral transmission screw and a dial indicator, which are respectively fixed on the top of the scraper assembly. The scraper assembly includes a scraper, a scraper seat, and a scraper bracket, wherein the scraper is installed and fixed on the right side of the scraper seat, and the scraper bracket is fixed on the front and rear sides of the scraper. The front and rear scraper brackets are connected by a top plate, and the top plates of the scraper seat and the scraper bracket are respectively provided with screw holes and meter mounting holes so that the spiral transmission screw and the dial indicator can be installed.

2. The mold for scraping and film-forming on the surface of a lithium strip according to claim 1, characterized in that A material rotating shaft is provided on the upper part of the bracket, and the lithium belt passes through the material rotating shaft and then cooperates with the scraper assembly to achieve a stable transmission function.

3. The mold for scraping and film-forming on the surface of a lithium strip according to claim 1, characterized in that The scraper assembly includes a scraper, and scraper brackets are fixed on the front and back sides of the scraper. The bottom of the scraper bracket is provided with an L-shaped card strip, and correspondingly, the top of the base is provided with an L-shaped card slot. The L-shaped card strip matches the L-shaped card slot to achieve sliding fixation.

4. The mold for scraping and film-forming on the surface of a lithium strip according to claim 3, characterized in that A slide bar is fixed on the lower part of the scraper bracket, a movable sleeve which can slide back and forth is sleeved on the outer wall of the slide bar, and a rotatable portable blade is fixed on the outer side of the movable sleeve.

5. The mold for scraping and film-forming on the surface of a lithium strip according to claim 1, characterized in that Fixed clips are provided on the left and right sides of the top of the base.

Images