A sodium-ion battery production process

Abstract

The application relates to the technical field of sodium ion battery production processes, in particular to a sodium ion battery production process, which comprises the following steps: Step one, positive and negative electrode slurry preparation: first, electrolyte and modified PVDF are mixed together and stirred, SP conductive agent and KS-6 conductive agent are added after stirring for a period of time, then manganese-based high-manganese prussian white is vacuum-stirred for a period of time, positive electrode slurry is obtained through vacuum defoaming treatment, then electrolyte and modified PVDF are mixed together and vacuum-stirred to form a stable and uniform colloidal solution, then hard carbon and SP conductive agent are continuously vacuum-stirred for a period of time to obtain negative electrode slurry; when the rotating shaft continuously moves back and forth in the slurry, the main shaft drives two groups of gears to rotate along two groups of racks, the rotating shaft drives three groups of turning plates to rotate in the slurry, the turning plates continuously rotate to realize stirring of the slurry, and the turning plates rotate during movement, so that the stirring intensity of the slurry is further increased.

Description

Technical Field

[0001] This invention relates to the field of sodium-ion battery manufacturing technology, specifically to a sodium-ion battery manufacturing process. Background Technology

[0002] Sodium-ion batteries are a type of rechargeable battery. Among various energy storage battery technologies, sodium-ion batteries are widely used in power tools, low-speed electric vehicles, photovoltaic and wind power energy storage due to their advantages such as medium-to-high energy density, long cycle life, wide operating environment, and high safety performance. The conventional manufacturing process of sodium-ion batteries includes: stirring → coating → electrode baking → slitting → die cutting → stacking → electrode tab transfer, etc.

[0003] In the coating process, the positive and negative electrode slurries obtained by stirring are coated onto the current collector (aluminum foil) respectively, and then baked to form the positive and negative electrode coatings. The coating equipment in the existing production process all use roller coating. During the use of the coating equipment, the existing slurry is placed in the slurry tank for a long time. Due to the lack of a stirring device, the slurry is very prone to solidification. This not only affects the adhesion of the slurry to the coating roller, but also makes the slurry on the coating roller uneven, thus affecting the coating quality. Summary of the Invention

[0004] The purpose of this invention is to provide a sodium-ion battery manufacturing process to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a sodium-ion battery manufacturing process, comprising the following steps:

[0006] Step 1: Preparation of positive and negative electrode slurries: First, mix the electrolyte and modified PVDF together and stir. After stirring for a period of time, add SP conductive agent and KS-6 conductive agent and stir for a period of time. Then, add manganese-based high-manganese Prussian white and stir under vacuum for a period of time. After vacuum degassing, the positive electrode slurry is obtained. Then, mix the electrolyte and modified PVDF together and stir under vacuum to form a stable and uniform colloidal solution. Then, add hard carbon and SP conductive agent and continue to stir under vacuum for a period of time to obtain the negative electrode slurry.

[0007] Step 2: Coating: The positive electrode slurry and negative electrode slurry obtained by stirring are placed into the coating device respectively. The coating device coats the slurry onto the current collector belt. Then, the drying device dries the slurry on the current collector to form a solidified positive electrode coating and negative electrode coating.

[0008] Step 3: Die cutting: The current collector tape coated with positive electrode slurry and negative electrode slurry respectively is cut by a cutting device to form the corresponding positive electrode sheet and negative electrode sheet;

[0009] Step 4: Stacking: Stack the positive electrode, negative electrode, and separator together layer by layer in the order of positive electrode - separator - negative electrode;

[0010] Step 5: Transfer and solder the electrode tabs;

[0011] Step Six: Top and Side Sealing;

[0012] Step 7: Battery Parker.

[0013] Preferably, the coating device includes a slurry storage box, a coating roller is installed inside the slurry storage box, the coating roller is connected to a stirring mechanism with a flipping function, and the coating roller is rotatably connected to the aluminum foil.

[0014] Preferably, the stirring mechanism includes a horizontal plate, two sets of horizontal plates are provided, two sets of receiving plates are symmetrically connected to both ends of the horizontal plates, two sets of rotating shafts are symmetrically arranged between the two sets of horizontal plates, slide rods are slidably connected to the horizontal plates, an L-shaped rod is provided on one set of horizontal plates, and a drive rod is provided on one side of the L-shaped rod.

[0015] Preferably, the rotating shaft includes a main shaft, on which three sets of flaps are arranged at equal angles, and two sets of gears are symmetrically connected at both ends of the main shaft, with the gears meshing with a rack.

[0016] Preferably, the horizontal plate has a built-in through hole, and the through hole is slidably connected to a slide rod. Two sets of slide rods are symmetrically fixed on the upper end face of the slurry storage box. Two sets of bearings are symmetrically arranged at both ends of the coating roller, and the bearings are embedded in the inner wall of the slurry storage box.

[0017] Preferably, one end of the L-shaped rod is fixedly connected to the middle of a set of horizontal plates, and a rectangular hole is opened on the L-shaped rod.

[0018] Preferably, one end of the drive rod is fixedly connected to the end of the coating roller, and the other end of the drive rod is provided with a pin, which is located in a rectangular hole and is slidably connected to the rectangular hole.

[0019] Preferably, the main shaft and three sets of flaps are integrally formed, and the main shaft and three sets of flaps are located inside the slurry storage box. Two sets of receiving plates are symmetrically screwed to both ends of the main shaft, and the rack is fixed to the inner wall of the slurry storage box.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The motor drives the coating roller to rotate at a constant speed. The slurry adhering to the coating roller rotates with the coating roller, so that the slurry comes into contact with the moving aluminum foil, thereby adhering the slurry to the aluminum foil and achieving coating of the aluminum foil. At the same time, the coating roller drives the drive rod to rotate. The pin at the end of the drive rod slides along the rectangular hole. The pin drives the L-shaped rod through the rectangular hole. The L-shaped rod drives the horizontal plate to move back and forth continuously along the slide bar. The reciprocating horizontal plate drives two sets of rotating shafts to move back and forth continuously in the slurry through two sets of receiving plates. The continuously moving rotating shafts cause the slurry to be constantly turned over, thereby achieving the stirring of the slurry. The stirring keeps the slurry in a continuous flow state, thereby preventing the slurry from solidifying.

[0022] 2. As the rotating shaft moves back and forth continuously within the slurry, the main shaft drives two sets of gears to rotate along two sets of racks, causing the rotating shaft to drive three sets of flaps to rotate within the slurry. The continuously rotating flaps agitate the slurry. The flaps rotate during their movement, thereby further increasing the agitation force on the slurry and making it less prone to solidification. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the coating device and aluminum foil combination of the present invention;

[0024] Figure 2 This is a schematic diagram of the coating apparatus of the present invention;

[0025] Figure 3 This is a schematic diagram of the coating device assembly of the present invention.

[0026] Figure 4 This is a schematic diagram of the coating roller, drive rod, L-shaped rod, receiving plate, and cross plate assembly of the present invention.

[0027] In the diagram: 1. Slurry storage box; 2. Coating roller; 3. Mixing mechanism; 4. Aluminum foil; 301. Horizontal plate; 302. Receiving plate; 303. Rotating shaft; 304. Slide rod; 305. L-shaped rod; 3051. Rectangular hole; 306. Drive rod; 3061. Pin; 3031. Main shaft; 3032. Flip plate; 3033. Gear; 3034. Rack. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1 to 4 This invention provides a technical solution: a sodium-ion battery manufacturing process, comprising the following steps:

[0030] Step 1: Preparation of positive and negative electrode slurries: First, mix the electrolyte and modified PVDF together and stir. After stirring for a period of time, add SP conductive agent and KS-6 conductive agent and stir for a period of time. Then, add manganese-based high-manganese Prussian white and stir under vacuum for a period of time. After vacuum degassing, the positive electrode slurry is obtained. Then, mix the electrolyte and modified PVDF together and stir under vacuum to form a stable and uniform colloidal solution. Then, add hard carbon and SP conductive agent and continue to stir under vacuum for a period of time to obtain the negative electrode slurry.

[0031] Step 2: Coating: The positive electrode slurry and negative electrode slurry obtained by stirring are placed into the coating device respectively. The coating device coats the slurry onto the current collector belt. Then, the drying device dries the slurry on the current collector to form a solidified positive electrode coating and negative electrode coating.

[0032] Step 3: Die cutting: The current collector tape coated with positive electrode slurry and negative electrode slurry respectively is cut by a cutting device to form the corresponding positive electrode sheet and negative electrode sheet;

[0033] Step 4: Stacking: Stack the positive electrode, negative electrode, and separator together layer by layer in the order of positive electrode - separator - negative electrode;

[0034] Step 5: Transfer and solder the electrode tabs;

[0035] Step Six: Top and Side Sealing;

[0036] Step 7: Battery Parker.

[0037] The coating device includes a slurry storage box 1, a coating roller 2 inside the slurry storage box 1, a stirring mechanism 3 with a flipping function connected to the coating roller 2, and an aluminum foil 4 rotatably connected to the coating roller 2. The stirring mechanism 3 includes a horizontal plate 301, with two sets of horizontal plates 301. Two sets of receiving plates 302 are symmetrically connected to both ends of the horizontal plates 301. Two sets of rotating shafts 303 are symmetrically arranged between the two sets of horizontal plates 301. A sliding rod 304 is slidably connected to the horizontal plate 301. An L-shaped rod 305 is arranged on one set of horizontal plates 301, and a drive rod 306 is arranged on one side of the L-shaped rod 305. The coating roller 2 has a built-in through hole, through which a sliding rod 304 is slidably connected. Two sets of sliding rods 304 are symmetrically fixed on the upper end face of the slurry storage box 1. Two sets of bearings are symmetrically arranged at both ends of the coating roller 2, and the bearings are embedded in the inner wall of the slurry storage box 1. One end of an L-shaped rod 305 is fixedly connected to the middle of a set of horizontal plates 301. A rectangular hole 3051 is opened on the L-shaped rod 305. One end of a drive rod 306 is fixedly connected to the end of the coating roller 2, and the other end of the drive rod 306 is provided with a pin 3061. The pin 3061 is located in the rectangular hole 3051, and the pin 3061 is slidably connected to the rectangular plate 3051. The aperture 3051 houses either the positive or negative electrode slurry within the slurry storage box 1. The coating roller 2 is mostly located within the slurry. Driven by a motor, the rotation of the coating roller 2 is synchronized with the movement of the aluminum foil 4. When slurry needs to be applied to the aluminum foil 4, the motor drives the coating roller 2 to rotate at a constant speed. The slurry adhering to the coating roller 2 rotates with it, bringing the slurry into contact with the moving aluminum foil 4, thus adhering the slurry to the aluminum foil 4 and achieving coating. Simultaneously, the coating roller 2 drives the drive rod 306 to rotate. The pin 3061 at the end will slide along the rectangular hole 3051. At the same time, the pin 3061 drives the L-shaped rod 305 through the rectangular hole 3051. The L-shaped rod 305 drives the horizontal plate 301 to move back and forth along the slide bar 304. The reciprocating horizontal plate 301 drives the two sets of rotating shafts 303 to move back and forth in the slurry through the two sets of receiving plates 302. The continuously moving rotating shafts 303 make the slurry constantly turn over, realizing the stirring of the slurry. The stirring keeps the slurry in a continuous flow state, thereby preventing the slurry from solidifying.

[0038] The rotating shaft 303 includes a main shaft 3031, on which three sets of flaps 3032 are arranged at equal angles. Two sets of gears 3033 are symmetrically connected to both ends of the main shaft 3031. The gears 3033 mesh with a rack 3034. The main shaft 3031 and the three sets of flaps 3032 are integrally formed and located inside the slurry storage box 1. Two sets of receiving plates 302 are symmetrically screwed to both ends of the main shaft 3031, and the rack 3034 is fixed to it. On the inner wall of the slurry storage box 1, when the rotating shaft 303 moves back and forth continuously in the slurry, the main shaft 3031 drives two sets of gears 3033 to rotate along two sets of racks 3034, so that the rotating shaft 303 drives three sets of flaps 3032 to rotate in the slurry. The continuously rotating flaps 3032 realize the stirring of the slurry. The flaps 3032 rotate during the movement, thereby further increasing the stirring force of the slurry and making the slurry less likely to solidify.

[0039] During operation, the motor drives the coating roller 2 to rotate at a constant speed. The slurry adhering to the coating roller 2 rotates with the coating roller 2, causing the slurry to come into contact with the moving aluminum foil 4, thereby adhering the slurry to the aluminum foil 4 and achieving coating of the aluminum foil 4. At the same time, the coating roller 2 drives the drive rod 306 to rotate, and the pin 3061 at the end of the drive rod 306 slides along the rectangular hole 3051. Simultaneously, the pin 3061 drives the L-shaped rod 305 through the rectangular hole 3051, and the L-shaped rod 305 drives the horizontal plate 30. 1. The slide bar 304 moves back and forth continuously. The reciprocating horizontal plate 301 drives two sets of rotating shafts 303 to move back and forth continuously in the slurry through two sets of receiving plates 302. The continuously moving rotating shafts 303 cause the slurry to be continuously turned over. At the same time, the main shaft 3031 drives two sets of gears 3033 to rotate along two sets of racks 3034, so that the rotating shafts 303 drive three sets of flip plates 3032 to rotate in the slurry. The continuously rotating flip plates 3032 realize the stirring of the slurry.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sodium-ion battery manufacturing process, comprising the following steps: Step 1: Preparation of positive and negative electrode slurries: First, mix the electrolyte and modified PVDF together and stir. After stirring for a period of time, add SP conductive agent and KS-6 conductive agent and stir for a period of time. Then, add manganese-based high-manganese Prussian white and stir under vacuum for a period of time. After vacuum degassing, the positive electrode slurry is obtained. Then, mix the electrolyte and modified PVDF together and stir under vacuum to form a stable and uniform colloidal solution. Then, add hard carbon and SP conductive agent and continue to stir under vacuum for a period of time to obtain the negative electrode slurry. Step 2: Coating: The positive electrode slurry and negative electrode slurry obtained by stirring are placed into the coating device respectively. The coating device coats the slurry onto the current collector belt. Then, the drying device dries the slurry on the current collector to form a solidified positive electrode coating and negative electrode coating. The coating device includes a slurry storage box (1), a coating roller (2) is provided inside the slurry storage box (1), the coating roller (2) is connected to a stirring mechanism (3) with a flipping function, and the coating roller (2) is rotatably connected to an aluminum foil (4). The stirring mechanism (3) includes a horizontal plate (301), two sets of the horizontal plate (301) are provided, two sets of receiving plates (302) are symmetrically connected at both ends of the horizontal plate (301), two sets of rotating shafts (303) are symmetrically arranged between the two sets of the horizontal plate (301), the horizontal plate (301) is slidably connected to the slide rod (304), an L-shaped rod (305) is provided on one set of the horizontal plate (301), and a drive rod (306) is provided on one side of the L-shaped rod (305). The horizontal plate (301) has a built-in through hole, and the through hole is slidably connected to the slide rod (304). The two sets of slide rods (304) are symmetrically fixed on the upper end face of the slurry storage box (1). The coating roller (2) has two sets of bearings symmetrically arranged at both ends, and the bearings are embedded in the inner wall of the slurry storage box (1). One end of the L-shaped rod (305) is fixedly connected to the middle of a set of horizontal plates (301), and a rectangular hole (3051) is opened on the L-shaped rod (305). One end of the drive rod (306) is fixedly connected to the end of the coating roller (2), and the other end of the drive rod (306) is provided with a pin (3061). The pin (3061) is located in the rectangular hole (3051), and the pin (3061) is slidably connected to the rectangular hole (3051). Step 3: Die cutting: The current collector tape coated with positive electrode slurry and negative electrode slurry respectively is cut by a cutting device to form the corresponding positive electrode sheet and negative electrode sheet; Step 4: Stacking: Stack the positive electrode, negative electrode, and separator together layer by layer in the order of positive electrode - separator - negative electrode; Step 5: Transfer and solder the electrode tabs; Step Six: Top and Side Sealing; Step 7: Battery Parker.

2. The sodium-ion battery production process of claim 1, wherein: The rotating shaft (303) includes a main shaft (3031), on which three sets of flaps (3032) are arranged at equal angles. Two sets of gears (3033) are symmetrically connected at both ends of the main shaft (3031), and the gears (3033) mesh with the rack (3034).

3. The sodium-ion battery manufacturing process according to claim 2, characterized in that: The main shaft (3031) and three sets of flaps (3032) are integrally formed. The main shaft (3031) and three sets of flaps (3032) are located inside the slurry storage box (1). Two sets of receiving plates (302) are symmetrically screwed to both ends of the main shaft (3031). The rack (3034) is fixed on the inner wall of the slurry storage box (1).

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