Slurry defoaming device

Abstract

The utility model provides a kind of slurry defoaming device, belong to lithium / sodium ion battery technical field.The utility model discloses that the upper surface of stirring tank body is fixedly installed with A, B driving device, the output end of A, B driving device is respectively fixedly connected with the top end of A, B stirring paddle, the discharge port of stirring tank is connected with the import of coating die head by conveying pipeline, discharge valve, connecting screw pump and filter are sequentially installed on the conveying pipeline from the direction of feed end to discharge end, and coating die head is connected with the feed inlet of stirring tank by return pipeline.The utility model is simple in structure, easy to operate, can greatly improve the coating of battery negative slurry due to the problem of bubble and lead to poor coating, can improve coating yield.

Description

Technical Field

[0001] This utility model relates to a slurry defoaming device, belonging to the field of lithium / sodium ion battery technology. Background Technology

[0002] In existing technologies, air bubbles are generated during the preparation and transportation of battery negative electrode slurry. If these air bubbles are not eliminated in time, they will cause the electrode foil to be exposed after coating with the negative electrode slurry, which will greatly affect the pass rate of the coating process. During the slurry coating process, pits and foil leakage will occur, which will greatly affect the coating yield. In particular, foil leakage on the negative electrode will cause lithium dendrites to form on the surface of the negative electrode during battery cycling, which will then puncture the separator and cause a short circuit inside the battery.

[0003] Current technologies typically defoam the slurry by creating negative pressure through vacuuming the mixing machine and transfer tank. However, this method still results in air bubbles remaining in the negative electrode slurry, leading to poor defoaming and failing to solve the problem of air bubbles in the battery negative electrode slurry. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art and to provide a slurry defoaming device.

[0005] The objective of this utility model is achieved through the following technical solution: A slurry defoaming device includes: a mixing tank, an inlet for the mixing tank on the upper surface and an outlet for the mixing tank on the lower surface; an A motor drive device is fixedly installed on the upper surface of the mixing tank, the output end of the A motor drive device is fixedly connected to the top end of an A stirring paddle, and the A stirring paddle is disposed inside the mixing tank. The discharge port of the mixing tank is connected to the inlet of the coating die head through a conveying pipe. A discharge valve, a connecting screw pump, and a filter are installed sequentially on the conveying pipe from the inlet to the outlet. The coating die head is connected to the inlet of the mixing tank through a return pipe.

[0006] Preferably, a B motor drive device is also fixedly installed on the upper surface of the mixing tank; the A motor drive device and the B motor drive device are symmetrically arranged with respect to the center of the upper surface of the mixing tank, and the output end of the B motor drive device is fixedly connected to the top end of the B stirring paddle; the B stirring paddle is disposed inside the mixing tank.

[0007] Preferably, the rotation directions of the A motor drive device and the B motor drive device are opposite.

[0008] Preferably, the A stirring paddle includes a stirring rod and multiple sets of scrapers. Each set of scrapers includes two blades and a blade retaining sleeve. The two blades are symmetrically fixed on both sides of the blade retaining sleeve. The blade retaining sleeve is detachably fixed on the stirring rod. The top of the stirring rod is fixedly connected to the output end of the A motor drive device. The B stirring paddle includes a stirring rod 2 and multiple sets of scrapers 2. Each set of scrapers 2 includes two blades 2 and a blade fixing sleeve 2. The two blades 2 are symmetrically fixed on both sides of the blade fixing sleeve 2 with respect to the center of the blade fixing sleeve 2. The blade fixing sleeve 2 is detachably fixed on the stirring rod 2. The top end of the stirring rod 2 is fixedly connected to the output end of the B motor drive device.

[0009] Preferably, both blade one and blade two are inclined at an angle of 30°-45°.

[0010] Preferably, both the upper edge of the first blade and the lower edge of the second blade are provided with several serrations.

[0011] Preferably, the adjacent blade one and blade two are staggered with each other.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a slurry defoaming device with a simple structure and easy operation. The slurry enters the coating die head through a screw pump and a filter, avoiding the limitation of not being able to achieve vacuum defoaming caused by the slurry directly entering the coating die head. It can greatly improve the poor coating caused by the presence of air bubbles in the battery negative slurry and improve the coating yield.

[0013] This invention utilizes a dual-motor drive system to rotate the agitators in opposite directions simultaneously, generating opposing shear forces within the slurry. This effectively breaks down the surface tension of air bubbles within the slurry, achieving a defoaming effect. Simultaneously, the scraper blades on both agitators A and B are angled at 30°-45°. During rotation, these angled blades continuously tumble the slurry, preventing sedimentation. Furthermore, the upper and lower edges of the angled scrapers on agitators A and B are equipped with sharp serrations, which more quickly and effectively break down air bubbles within the slurry, achieving the defoaming effect. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a slurry defoaming device according to the present invention.

[0015] Figure 2 This is a schematic diagram of the A-type stirring paddle structure of this utility model.

[0016] Figure 3This is a schematic diagram of the B-type stirring paddle structure of this utility model.

[0017] The reference numerals in the diagram are as follows: 1 is the mixing tank body, 2 is the mixing tank inlet, 3 is motor A drive unit, 4 is motor B drive unit, 5 is agitator A, 5-1 is agitator rod one, 5-2 is blade one, 5-3 is blade retaining sleeve one, 6 is agitator B, 6-1 is agitator rod two, 6-2 is blade two, 6-3 is blade retaining sleeve two, 7 is the mixing tank outlet, 8 is the outlet valve, 9 is the screw pump, 10 is the filter, 11 is the feed pipe, 12 is the coating die head, and 13 is the return pipe. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings: This embodiment is implemented based on the technical solution of the present invention and provides detailed implementation methods, but the protection scope of the present invention is not limited to the following embodiments.

[0019] like Figure 1 As shown, a slurry defoaming device includes: a slurry defoaming device, comprising: a mixing tank 1, wherein the upper surface of the mixing tank 1 is provided with a mixing tank inlet 2, and the lower surface of the mixing tank 1 is provided with a mixing tank outlet 7; an A motor drive device 3 is fixedly installed on the upper surface of the mixing tank 1, the output end of the A motor drive device 3 is fixedly connected to the top end of an A stirring paddle 5, and the A stirring paddle 5 is disposed inside the mixing tank 1; The discharge port 7 of the mixing tank is connected to the inlet of the discharge valve 8 through a conveying pipe. The outlet of the discharge valve 8 is connected to the inlet of the screw pump 9 through a conveying pipe. The discharge port of the screw pump 9 is connected to the inlet of the filter 10 through a conveying pipe. The outlet of the filter 10 is connected to the coating die head 12 through the inlet pipe 11. The coating die head 12 is connected to the inlet 2 of the mixing tank through the return pipe 13.

[0020] A B motor drive device 4 is also fixedly installed on the upper surface of the mixing tank 1; the A motor drive device 3 and the B motor drive device 4 are symmetrically arranged with respect to the center of the upper surface of the mixing tank 1, and the output end of the B motor drive device 4 is fixedly connected to the top end of the B stirring paddle 6; the B stirring paddle 6 is disposed inside the mixing tank 1. The A motor drive device 3 and the B motor drive device 4 rotate in opposite directions. After rotation, they create opposing shear forces inside the slurry, which helps to break the surface tension of air bubbles inside the slurry and achieve a defoaming effect.

[0021] like Figure 2As shown, the A stirring paddle 5 includes a stirring rod 5-1 and multiple sets of scrapers. Each set of scrapers includes two blades 5-2 and a blade retaining sleeve 5-3. The two blades 5-2 are symmetrically fixed on both sides of the blade retaining sleeve 5-3. The blade retaining sleeve 5-3 is detachably fixed on the stirring rod 5-1. The top end of the stirring rod 5-1 is fixedly connected to the output end of the A motor drive device 3.

[0022] like Figure 3 As shown, the B stirring paddle 6 includes a stirring rod 6-1 and multiple sets of scrapers. Each set of scrapers includes two blades 6-2 and a blade fixing sleeve 6-3. The two blades 6-2 are symmetrically fixed on both sides of the blade fixing sleeve 6-3. The blade fixing sleeve 6-3 is detachably fixed on the stirring rod 6-1. The top end of the stirring rod 6-1 is fixedly connected to the output end of the B motor drive device 4.

[0023] Both blade 5-2 and blade 6-2 are inclined at an angle of 30°-45°. During rotation, the inclined blades continuously tumble the slurry, preventing sedimentation. Several serrations, preferably triangular in shape, are provided on the upper edge of blade 5-2 and the lower edge of blade 6-2 to more quickly and effectively break up air bubbles within the slurry, achieving a defoaming effect. Adjacent blades 5-2 and 6-2 are staggered.

[0024] Example 1: A slurry defoaming device, in this embodiment, uses dual motors to drive slurry mixing, and the working process includes the following steps: Step 1: Adjust the distance between impeller A (5) and impeller B (6) according to actual needs; Step Two: The slurry is conveyed into the mixing tank 1 through the inlet 2 or return pipe 13. Motor A drive 3 is activated to drive agitator 5 to rotate, while motor B drive 4 is activated to drive agitator 6. Motor A drive 3 and motor B drive 4 rotate in opposite directions, thus causing agitators 5 and 6 to rotate in opposite directions. The adjacent blades 5-2 and 6-2 of agitators 5 and 6 are staggered. The distances between blades 5-2, between blades 6-2, and between blades 5-2 and 6-2 can be adjusted by changing the position of blade fixing sleeve 5-3 on agitator rod 5-1 and the position of blade fixing sleeve 6-3 on agitator rod 6-1. When agitators 5 and 6 rotate relative to each other, opposing shear forces exist within the slurry, which helps to break the surface tension of air bubbles within the slurry, achieving a defoaming effect. Meanwhile, both A-paddle 5 and B-paddle 6 are equipped with blade 5-2 and blade 6-2 with an inclination angle of 30°-45°. During rotation, the blades 5-2 and 6-2 with an inclination angle of 30°-45° can continuously tumble the slurry, preventing sedimentation. Furthermore, the upper edge of blade 5-2 in A-paddle 5 is provided with sharp serrations; the lower edge of blade 6-2 in B-paddle 6 is provided with several serrations, preferably triangular in shape, which can more quickly and effectively break up air bubbles inside the slurry, achieving a defoaming effect. Step 3: Start the circulation mode of the mixing tank 1 and the coating die 12. The slurry in the mixing tank 1 enters the feed port of the screw pump 9 through the discharge port 7 and the discharge valve 8, then enters the inlet of the filter 10 through the discharge port of the screw pump 9, and then enters the coating die 12 through the outlet of the filter 10. The coating die 12 returns the slurry to the feed port 2 of the mixing tank through the return pipe 13. After the slurry circulates in this way for 10-15 minutes, close the discharge valve 8. Step 4: When the slurry has been defoamed and needs to be discharged, open the discharge valve 8 to allow the defoamed slurry to proceed to the next coating process.

[0025] Example 2: A slurry defoaming device, in this embodiment, can also be driven by a single motor for slurry mixing. The specific working process includes the following steps: Step 1: Select a suitable motor A drive device 3 according to the actual requirements of the site. The speed of motor A drive device 3 is 10-30 r / min. Step 2: Inject the slurry into the mixing tank 1 through the feed port 2 or return pipe 13, and at the same time turn on the A motor drive device 3, which drives the A mixing paddle 5 to rotate. Step 3: Start the circulation mode of the mixing tank 1 and the coating die 12. The slurry in the mixing tank 1 enters the feed port of the screw pump 9 through the discharge port 7 and discharge valve 8 of the mixing tank, then enters the inlet of the filter 10 through the discharge port of the screw pump 9, and then enters the coating die 12 through the outlet of the filter 10. The coating die 12 returns the slurry to the feed port 2 of the mixing tank through the return pipe 13. The slurry circulates in this way for 10-15 minutes. Step 4: After the slurry has finished circulating with the coating die head 12, open the discharge valve 8 to allow the defoamed slurry to proceed to the next coating process.

[0026] The above description is merely a preferred embodiment of this utility model. These specific embodiments are different implementations based on the overall concept of this utility model, and the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A slurry de-foaming device comprising: A mixing tank (1) is provided with a mixing tank inlet (2) on its upper surface and a mixing tank outlet (7) on its lower surface. The mixing tank (1) is characterized in that an A motor drive device (3) is fixedly installed on the upper surface of the mixing tank (1), and the output end of the A motor drive device (3) is fixedly connected to the top end of an A stirring paddle (5). The A stirring paddle (5) is located inside the mixing tank (1). The discharge port (7) of the mixing tank is connected to the inlet of the coating die head (12) through a conveying pipe. The conveying pipe is installed sequentially from the inlet end to the outlet end, including a discharge valve (8), a connecting screw pump (9) and a filter (10). The coating die head (12) is connected to the inlet port (2) of the mixing tank through a return pipe (13).

2. The slurry defoaming device according to claim 1, wherein, The upper surface of the mixing tank (1) is also fixedly installed with a B motor drive device (4); the A motor drive device (3) and the B motor drive device (4) are symmetrically arranged with respect to the upper surface of the mixing tank (1), and the output end of the B motor drive device (4) is fixedly connected to the top of the B stirring paddle (6); the B stirring paddle (6) is arranged inside the mixing tank (1).

3. A slurry defoaming device according to claim 2, wherein The rotation direction of the A motor drive device (3) is opposite to that of the B motor drive device (4).

4. The slurry defoaming device of claim 2, wherein, The A stirring paddle (5) includes a stirring rod (5-1) and multiple sets of scrapers. Each set of scrapers includes two blades (5-2) and a blade fixing sleeve (5-3). The two blades (5-2) are symmetrically fixed on both sides of the blade fixing sleeve (5-3) with respect to the center of the blade fixing sleeve (5-3). The blade fixing sleeve (5-3) is detachably fixed on the stirring rod (5-1). The top end of the stirring rod (5-1) is fixedly connected to the output end of the A motor drive device (3). The B stirring paddle (6) includes a stirring rod (6-1) and multiple sets of scrapers. Each set of scrapers includes two blades (6-2) and a blade fixing sleeve (6-3). The two blades (6-2) are symmetrically fixed on both sides of the blade fixing sleeve (6-3) with respect to the center. The blade fixing sleeve (6-3) is detachably fixed on the stirring rod (6-1). The top of the stirring rod (6-1) is fixedly connected to the output end of the B motor drive device (4).

5. A slurry defoaming device according to claim 4, wherein Both blade one (5-2) and blade two (6-2) are inclined, with an inclination angle of 30°-45°.

6. A slurry defoaming device according to claim 4, wherein Several serrations are provided on the upper edge of blade one (5-2) and the lower edge of blade two (6-2).

7. The slurry defoaming device of claim 4, wherein Adjacent blades 1 (5-2) and 2 (6-2) are interspersed.

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