Battery slurry continuous feeding and mixing system

Abstract

The utility model relates to the field of batteries, in particular to a battery slurry continuous feeding and mixing system. The utility model provides a continuous feeding and mixing system for battery slurry. The system comprises a powder buffer tank, an auger conveying pipe, a high-speed stirring tank and a defoaming tank, wherein a discharging opening in the bottom end of the powder buffer tank is connected with a feeding opening pipeline of the auger conveying pipe, a discharging opening of the auger conveying pipe is connected with a feeding opening pipeline in the top end of the high-speed stirring tank, and a discharging opening in the bottom end of the high-speed stirring tank is connected with a feeding opening pipeline in the top end of the defoaming tank; by arranging the auger conveying pipe, materials can be kneaded in the conveying process, and long-time stagnation of the materials in the conveying process is avoided; the first valve is arranged between the high-speed stirring tank and the defoaming tank, the feeding amount of the high-speed stirring tank to the defoaming tank is controlled only through the first valve, operation of the powder buffer tank, the auger conveying pipe and the high-speed stirring tank does not need to be paused, and feeding can be continuously conducted into the powder buffer tank.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a battery slurry continuous feeding and mixing system. Background Art

[0002] Rechargeable battery, also known as rechargeable battery or storage battery, refers to a battery that can be recharged to activate the active material and continue to be used after the battery is discharged. The main rechargeable batteries on the market are nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid (or lead storage) batteries, lithium-ion batteries, polymer lithium-ion batteries, sodium-ion batteries, etc. The production capacity of the secondary battery mixing stage is related to the volume of the mixing tank equipped. The mixing process of the existing process can only continue to feed after the slurry is discharged. Not only is the cycle long, but it also consumes a lot of energy. When there is a demand for increasing production and efficiency, production is easily restricted.

[0003] Therefore, there is an urgent need for a system that can continuously feed and mix materials. Utility Model Content

[0004] The utility model aims to provide a battery slurry continuous feeding and mixing system in view of the deficiencies in the prior art.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] Provided is a battery slurry continuous feeding and mixing system, including: a powder buffer tank, a Jiaolong transport pipe, a high-speed stirring tank and a defoaming tank;

[0007] Among them, the discharge port at the bottom end of the powder buffer tank is connected to the feed port pipeline of the Jiaolong transport pipe, the discharge port of the Jiaolong transport pipe is connected to the feed port pipeline at the top end of the high-speed stirring tank, and the discharge port at the bottom end of the high-speed stirring tank is connected to the feed port pipeline at the top end of the defoaming tank; the top pipeline of the defoaming tank is connected to the vacuum system, and the discharge port pipeline at the bottom end of the defoaming tank is connected to the coating machine head buffer tank.

[0008] Preferably, a feeding port is provided at the top of the powder buffer tank, and a first stirring component is provided in the powder buffer tank.

[0009] Preferably, a plurality of first solvent spray openings are provided on the side wall of the Jiaolong transport pipe, and the plurality of first solvent spray openings are arranged along the axial direction of the Jiaolong transport pipe.

[0010] Preferably, a second solvent spray port is provided at the top of the high-speed stirring tank; and a second stirring component is provided in the high-speed stirring tank.

[0011] Preferably, a third solvent spray port is provided at the top of the defoaming tank; and a third stirring component is provided in the defoaming tank.

[0012] Preferably, a first valve is connected to the pipeline between the discharge port of the high-speed stirring tank and the feed port of the defoaming tank.

[0013] Preferably, a second valve is connected to the pipeline between the discharge port of the defoaming tank and the coating machine head buffer tank.

[0014] The utility model adopts the above technical solution, and compared with the prior art, has the following technical effects:

[0015] The utility model provides a Jiaolong transport pipe, so that the material can be kneaded during the transportation process, and the kneaded material continues to be stirred and dispersed after entering the high-speed stirring tank, thus avoiding long-term stagnation of the material during the transportation process; a first valve is provided between the high-speed stirring tank and the defoaming tank, and only the first valve is needed to control the amount of material supplied from the high-speed stirring tank to the defoaming tank, without suspending the operation of the powder buffer tank, the Jiaolong transport pipe and the high-speed stirring tank, and the powder buffer tank can be continuously fed into the powder buffer tank, and subsequent mixing operations can be carried out, thus solving the problem that the mixing process of the existing process can only continue to feed after the slurry is discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a flow chart of a battery slurry continuous feeding and mixing system in one embodiment of the utility model;

[0017] Reference numerals in the figures include:

[0018] Powder buffer tank 1; feeding port 11; Jiaolong transport pipe 2; first solvent spray port 21; high-speed stirring tank 3; second solvent spray port 31; defoaming tank 4; third solvent spray port 41. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0022] Example

[0023] Provided is a battery slurry continuous feeding and mixing system, comprising: a powder buffer tank 1, a Jiaolong transport pipe 2, a high-speed stirring tank 3 and a defoaming tank 4;

[0024] Among them, the discharge port at the bottom end of the powder buffer tank 1 is connected to the feed port pipeline of the Jiaolong transport pipe 2, the discharge port of the Jiaolong transport pipe 2 is connected to the feed port pipeline at the top end of the high-speed stirring tank 3, the discharge port at the bottom end of the high-speed stirring tank 3 is connected to the feed port pipeline at the top end of the defoaming tank 4, and the pipeline between the discharge port of the high-speed stirring tank 3 and the feed port of the defoaming tank 4 is connected with a first valve; the top pipeline of the defoaming tank 4 is connected with a vacuum system, and the discharge port pipeline at the bottom end of the defoaming tank 4 is connected with a coating machine head buffer tank; the pipeline between the discharge port of the defoaming tank 4 and the coating machine head buffer tank is connected with a second valve;

[0025] A feeding port 11 is provided at the top of the powder buffer tank 1, and a first stirring component is provided in the powder buffer tank 1; a plurality of first solvent spray ports 21 are provided on the side wall of the Jiaolong transport pipe 2, and the plurality of first solvent spray ports 21 are arranged along the axial direction of the Jiaolong transport pipe 2; a second solvent spray port 31 is provided at the top of the high-speed stirring tank 3; a second stirring component is provided in the high-speed stirring tank 3; a third solvent spray port 41 is provided at the top of the defoaming tank 4; a third stirring component is provided in the defoaming tank 4.

[0026] Process flow:

[0027] S1, continuously adding lithium iron phosphate, carbon black, carbon nanotubes, and polyvinylidene fluoride in a ratio of 96:1:1:2 from the feeding port 11 into the powder buffer tank 1 at a constant speed of 20 kg / min;

[0028] S2, the lithium iron phosphate mixture is stirred and dispersed in the powder buffer tank 1 at a stirring speed of 20 rpm and a dispersion speed of 500 rpm;

[0029] S3. When the volume of the lithium iron phosphate mixture in the powder buffer tank 1 reaches 2 / 3 of the volume of the powder buffer tank 1, the discharge port at the bottom of the powder buffer tank 1 is opened, and the lithium iron phosphate mixture enters the Jiaolong transport pipe 2 from the discharge port at the bottom of the powder buffer tank 1 at a discharge speed of 50 kg / min; N-methyl pyrrolidone is injected into the Jiaolong transport pipe 2 through the first solvent spray port 21, and stirred and kneaded with the lithium iron phosphate mixture at a rate of 15 rpm, and the injection rate of N-methyl pyrrolidone is 8 kg / min;

[0030] S4, the lithium iron phosphate mixture in the Jiaolong transport pipe 2 enters the high-speed stirring tank 3 from the discharge port of the Jiaolong transport pipe 2 at a speed of 28 kg / min, and N-methyl pyrrolidone is injected into the high-speed stirring tank 3 through the second solvent spray port 31, and the mixture in the high-speed stirring tank 3 is stirred and dispersed at a stirring speed of 22 rpm and a dispersion speed of 2200 rpm. The rate of injecting N-methyl pyrrolidone is 4 kg / min, and the volume of the mixture in the high-speed stirring tank 3 is not greater than 2 / 3 of the volume of the high-speed stirring tank 3;

[0031] S5, open the first valve, the mixture in the high-speed stirring tank 3 is transported to the defoaming tank 4 through the discharge port at the bottom of the high-speed stirring tank 3, when the volume of the mixture reaches 2 / 3 of the volume of the defoaming tank 4, close the first valve, open the vacuum system, vacuum -90kPa, at a stirring speed of 10rpm, a dispersion speed of 100rpm, after stirring for 10min, close the vacuum system, open the second valve, and the qualified slurry enters the coating head buffer tank;

[0032] S6. Close the second valve and repeat step S5.

[0033] The slurry was taken for performance testing, and the results are shown in Table 1;

[0034] Table 1

[0035] Example Traditional crafts Slurry viscosity mPa·s 6800 6500 Slurry fineness μm 12 13 Slurry solid content 62.5％ 60.6％ Gram capacity mAh / g 156.8 157.2 Capacity (slurry) 42240kg / day 29703kg / day

[0036] To sum up, the utility model provides a Jiaolong transport pipe, so that the material can be kneaded during the transportation process, and the kneaded material continues to be stirred and dispersed after entering the high-speed stirring tank, thereby avoiding long-term stagnation of the material during transportation; a first valve is provided between the high-speed stirring tank and the defoaming tank, and only the first valve is used to control the amount of material supplied from the high-speed stirring tank to the defoaming tank. There is no need to suspend the operation of the powder buffer tank, the Jiaolong transport pipe and the high-speed stirring tank. The powder buffer tank can be continuously fed with material, and subsequent mixing operations can be carried out, thereby solving the problem that the mixing process of the existing process can only be continued after the slurry is discharged.

[0037] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery slurry continuous feeding and mixing system, characterized in that: include: A powder buffer tank (1), a Jiaolong transport pipe (2), a high-speed stirring tank (3) and a defoaming tank (4); Among them, the discharge port at the bottom end of the powder buffer tank (1) is connected to the feed port pipeline of the Jiaolong transport pipe (2), the discharge port of the Jiaolong transport pipe (2) is connected to the feed port pipeline at the top end of the high-speed stirring tank (3), and the discharge port at the bottom end of the high-speed stirring tank (3) is connected to the feed port pipeline at the top end of the defoaming tank (4); the top pipeline of the defoaming tank (4) is connected to the vacuum system, and the discharge port pipeline at the bottom end of the defoaming tank (4) is connected to the coating machine head buffer tank.

2. The battery slurry continuous feeding and mixing system according to claim 1, characterized in that: A feeding port (11) is provided at the top of the powder buffer tank (1), and a first stirring component is provided inside the powder buffer tank (1).

3. The battery slurry continuous feeding and mixing system according to claim 1, characterized in that: A plurality of first solvent spraying openings (21) are provided on the side wall of the Jiaolong transport pipe (2), and the plurality of first solvent spraying openings (21) are arranged along the axial direction of the Jiaolong transport pipe (2).

4. The battery slurry continuous feeding and mixing system according to claim 1, characterized in that: A second solvent spray port (31) is provided at the top of the high-speed stirring tank (3); and a second stirring component is provided inside the high-speed stirring tank (3).

5. The battery slurry continuous feeding and mixing system according to claim 1, characterized in that: A third solvent spray port (41) is provided at the top of the defoaming tank (4); and a third stirring component is provided inside the defoaming tank (4).

6. The battery slurry continuous feeding and mixing system according to claim 1, characterized in that: A first valve is connected to the pipeline between the discharge port of the high-speed stirring tank (3) and the feed port of the defoaming tank (4).

7. The battery slurry continuous feeding and mixing system according to claim 1, characterized in that: A second valve is connected to the pipeline between the discharge port of the defoaming tank (4) and the coating machine head buffer tank.

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