Battery slurry preparation device

Abstract

The utility model relates to the technical field of battery slurry preparation, and discloses a battery slurry preparation device, which comprises a stirrer comprising a stirring tank, a plurality of stirring paddles and a first driving mechanism, the stirring tank is provided with a plurality of stirring feed ports and discharge ports, and the first driving mechanism drives the stirring paddles to move so as to knead and dilute slurry; the screw extruder is arranged below the stirring machine, the screw extruder comprises a dispersing material barrel, a screw and a second driving mechanism, and the dispersing material barrel is provided with a feeding opening, a first dispersing cavity, a second dispersing cavity, a dispersing feeding opening and a discharging opening; the upper end of the feeding part is connected with the discharge hole and the lower end is connected with the feeding opening. Slurry is kneaded and diluted through the stirrer, then the slurry is dispersed through the screw extruder, kneading and dilution are not carried out through the screw extruder, kneading and dilution steps are omitted through the screw extruder, the length of a screw is greatly shortened, abrasion of the screw is reduced, and the service life of the screw is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of battery slurry preparation, in particular to a battery slurry preparation device. Background Art

[0002] During the pulping process of the positive and negative electrode materials of batteries in the lithium battery industry, the selection of pulping equipment is often considered according to the different requirements of its own process and production capacity. The general pulping equipment in the industry is a screw extruder. During pulping, the active substance and the conductive agent are put into the front end of the screw, and then move backward under the conveying action of the screw. Then, the solvent or the sizing agent is put in multiple times at the subsequent part of the screw, and processes such as kneading, dilution, dispersion, and degassing are realized under the action of different screw elements, and the finished slurry is output at the end of the screw. The screw is relatively long, the screw wears highly, the service life of the screw is low, and it needs to be replaced frequently, reducing the production efficiency. Summary of the Utility Model

[0003] In view of this, the utility model provides a battery slurry preparation device to solve the problems of high wear and low service life of the screw caused by the long length of the screw when using a screw extruder to prepare battery slurry.

[0004] The utility model provides a battery slurry preparation device, including: a mixer, including a mixing tank, a plurality of mixing paddles and a first driving mechanism. The mixing tank has a plurality of mixing feed inlets and a discharge outlet. The plurality of mixing paddles are arranged in the mixing tank, and the first driving mechanism drives the mixing paddles to move to knead and dilute the slurry; a screw extruder is arranged below the mixer. The screw extruder includes a dispersion barrel, a screw and a second driving mechanism. The dispersion barrel has a feed opening, a first dispersion chamber, a second dispersion chamber, a dispersion feed inlet and a discharge opening. The feed opening is communicated with the first dispersion chamber, the dispersion feed inlet is communicated with the second dispersion chamber, the screw is arranged in the dispersion barrel, and one end of the screw passes through the dispersion barrel and is connected with the first driving mechanism; a feeding component, the upper end of which is connected to the discharge outlet and the lower end of which is connected to the feed opening.

[0005] Beneficial effects: The slurry is kneaded and diluted by the mixer, and then the slurry is dispersed by the screw extruder. The kneading and dilution are not carried out by the screw extruder. The screw extruder omits the kneading and dilution steps, greatly shortening the length of the screw, reducing the wear of the screw, extending the service life of the screw, and eliminating the need for frequent screw replacement, thus improving the production efficiency. Moreover, the screw extruder is arranged below the mixer, that is, the mixer and the screw extruder adopt an upper and lower layer structure, making full use of the vertical space, the preparation device occupies a small area, and the feeding component is used to connect the mixer and the screw extruder, shortening the slurry transportation distance.

[0006] In an optional embodiment, the mixing paddle includes a paddle blade, and the surface of the paddle blade has a plurality of protrusions.

[0007] Beneficial effects: The protrusions can increase the contact area between the stirring paddle and the slurry, thereby improving the stirring effect of the stirring paddle.

[0008] In an alternative embodiment, the protrusions are hemispherical.

[0009] Beneficial effects: The smooth surface of the protrusions can reduce the stirring resistance and the stirring effect is good.

[0010] In an alternative embodiment, the diameter of the protrusions is 5 mm - 50 mm, and the distance between two adjacent protrusions is 8 mm - 60 mm.

[0011] Beneficial effects: The size and spacing of the protrusions are set within a reasonable range to ensure the stirring effect.

[0012] In an alternative embodiment, the feeding component is a screw conveyor.

[0013] Beneficial effects: The diluted slurry is conveyed to the screw extruder by means of screw feeding, improving the conveying efficiency and thus the efficiency of preparing the slurry.

[0014] In an alternative embodiment, the distance between the bottom of the stirring paddle and the bottom of the stirring tank is 5 mm - 10 mm.

[0015] Beneficial effects: The stirring paddle can stir the slurry at the bottom, effectively avoiding the situation that the large distance between the stirring paddle and the bottom of the stirring tank causes uneven mixing of the bottom slurry.

[0016] In an alternative embodiment, the stirring paddle includes an intermediate stirring paddle and an edge stirring paddle; the intermediate stirring paddle is arranged in the middle of the stirring tank, and the edge stirring paddle is arranged on the side of the intermediate stirring paddle.

[0017] Beneficial effects: The intermediate stirring paddle and the edge stirring paddle cooperate to knead and dilute the slurry, making the mixed slurry more uniform.

[0018] In an alternative embodiment, the pitch of the spiral blades of the screw is between 15 mm and 50 mm, and the outer diameter and pitch of the spiral blades gradually increase from the end close to the second driving mechanism to the other end.

[0019] Beneficial effects: The setting of the screw not only makes the dispersion effect of the slurry better, but also facilitates the output of the dispersed slurry.

[0020] In an alternative embodiment, the minimum distance between the edge stirring paddle and the tank wall of the stirring tank is 8 mm - 15 mm.

[0021] Beneficial effects: The edge stirring paddle can stir up the slurry at the edge of the stirring tank, avoiding the uneven mixing of the slurry at the edge.

[0022] In an optional embodiment, the ratio of the width to the height of the middle stirring paddle is (1.5 - 3):1, and the ratio of the width to the height of the edge stirring paddle is 1:(4 - 6).

[0023] Beneficial effects: The width of the middle stirring paddle is larger than the height, and the height of the edge stirring paddle is larger than the width, which can stir up the slurry above the edge of the stirring tank, avoiding the uneven mixing of the slurry above the edge, and the slurry can be mixed more evenly through the cooperation of the middle stirring paddle and the edge stirring paddle. Description of the Drawings

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a schematic structural diagram of a battery slurry preparation device according to an embodiment of the present invention.

[0026] Description of the reference numerals:

[0027] 1. Mixer; 101. Stirring tank; 1011. First stirring feed port; 1012. Second stirring feed port; 1013. Third stirring feed port; 102. Middle stirring paddle; 103. Edge stirring paddle; 104. Protrusion;

[0028] 2. Screw extruder; 201. Dispersion barrel; 2011. First dispersion chamber; 2012. Second dispersion chamber; 2013. Dispersion feed port; 202. Screw; 203. Second driving mechanism;

[0029] 3. Feeding component. Detailed Embodiments

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0031] The following will describe embodiments of the present utility model in conjunction with Figure 1 to describe embodiments of the present utility model.

[0032] According to an embodiment of the present utility model, a battery paste preparation device is provided, including: a blender 1, a screw extruder 2 and a feeding component 3. The blender 1 includes a mixing tank 101, a plurality of mixing paddles and a first driving mechanism. The mixing tank 101 has a plurality of mixing feed ports and a discharge port. The plurality of mixing paddles are arranged in the mixing tank 101, and the first driving mechanism drives the mixing paddles to move to knead and dilute the paste. The screw extruder 2 is arranged below the blender 1. The screw extruder 2 includes a dispersion barrel 201, a screw 202 and a second driving mechanism 203. The dispersion barrel 201 has a feed opening, a first dispersion chamber 2011, a second dispersion chamber 2012, a dispersion feed port 2013 and a discharge opening. The feed opening is communicated with the first dispersion chamber 2011, the dispersion feed port 2013 is communicated with the second dispersion chamber 2012, the screw 202 is arranged in the dispersion barrel 201, and one end of the screw 202 passes through the dispersion barrel 201 and is connected to the first driving mechanism. The upper end of the feeding component 3 is connected to the discharge port and the lower end is connected to the feed opening.

[0033] Applying the battery paste preparation device of this embodiment, the blender 1 kneads and dilutes the paste, and then the screw extruder 2 disperses the paste. The screw extruder 2 does not perform kneading and dilution. The screw extruder 2 omits the kneading and dilution steps, greatly shortening the length of the screw 202, reducing the wear of the screw 202, extending the service life of the screw 202, and eliminating the need to frequently replace the screw 202, thereby improving production efficiency. Moreover, the screw extruder 2 is arranged below the blender 1, that is, the blender 1 and the screw extruder 2 adopt an upper and lower layer structure, making full use of the vertical space, with a small occupied area of the preparation device, and connecting the blender 1 and the screw extruder 2 through the feeding component 3 to shorten the paste transportation distance.

[0034] It should be noted that there are only two dispersion chambers in the screw extruder 2.

[0035] In one embodiment, the mixing paddle includes a paddle blade, and the surface of the paddle blade has a plurality of protrusions 104. The setting of the protrusions 104 can increase the contact area between the mixing paddle and the paste, thereby improving the mixing effect of the mixing paddle.

[0036] Specifically, the protrusions 104 are hemispherical, and the surface of the protrusions 104 is smooth, which can reduce the mixing resistance and has a good mixing effect.

[0037] It can be understood that in other embodiments, the protrusions 104 can also be semi-elliptical or the like.

[0038] In one embodiment, the diameter of the protrusion 104 is 5 mm - 50 mm, and the distance between two adjacent protrusions 104 is 8 mm - 60 mm. Setting the size and spacing of the protrusions within a reasonable range ensures the stirring effect.

[0039] It can be understood that in other embodiments, the size and spacing of the protrusion 104 need to be set according to specific circumstances and are not limited thereto.

[0040] In one embodiment, the feeding component 3 is a screw conveyor, which conveys the diluted slurry to the screw extruder 2 in a screw feeding manner, improving the conveying efficiency and thus the efficiency of preparing the slurry.

[0041] It can be understood that in other embodiments, the feeding component 3 is a feeding pipe.

[0042] In one embodiment, the distance between the bottom of the stirring paddle and the bottom of the stirring tank 101 is 5 mm - 10 mm. The stirring paddle can stir the slurry at the bottom, effectively avoiding the situation where the large distance between the bottom of the stirring paddle and the bottom of the stirring tank 101 causes uneven mixing of the bottom slurry.

[0043] It can be understood that in other embodiments, the distance between the bottom of the stirring paddle and the bottom of the stirring tank 101 needs to be set according to specific circumstances and is not limited thereto.

[0044] In one embodiment, the stirring paddle includes an intermediate stirring paddle 102 and an edge stirring paddle 103; the intermediate stirring paddle 102 is arranged in the middle of the stirring tank 101, and the edge stirring paddle 103 is arranged on the side of the intermediate stirring paddle 102. The intermediate stirring paddle 102 and the edge stirring paddle 103 cooperate to knead and dilute the slurry, making the mixed slurry more uniform.

[0045] Further, the number of the edge stirring paddles 103 is two. It can be understood that the number of the edge stirring paddles 103 is not limited thereto and can be set according to specific circumstances.

[0046] In one embodiment, the minimum distance between the edge stirring paddle 103 and the tank wall of the stirring tank 101 is 8 mm - 15 mm. The edge stirring paddle 103 can stir up the slurry at the edge of the stirring tank 101, avoiding the situation of uneven mixing of the slurry at the edge.

[0047] It can be understood that in other embodiments, the minimum distance between the edge stirring paddle 103 and the tank wall of the stirring tank 101 needs to be set according to specific circumstances and is not limited thereto.

[0048] In one embodiment, the ratio of the width to the height of the intermediate stirring paddle 102 is (1.5 - 3):1, and the ratio of the width to the height of the edge stirring paddle 103 is 1:(4 - 6). The width of the intermediate stirring paddle 102 is greater than the height, and the height of the edge stirring paddle 103 is greater than the width, which can stir up the slurry in the upper part of the edge of the stirring tank 101, avoid the uneven mixing of the slurry in the upper part of the edge, and can mix the slurry more evenly through the cooperation of the intermediate stirring paddle 102 and the edge stirring paddle 103.

[0049] It can be understood that in other embodiments, the ratio of the width to the height of the intermediate stirring paddle 102 and the ratio of the width to the height of the edge stirring paddle 103 need to be set according to specific circumstances and are not limited thereto.

[0050] In one embodiment, the pitch of the spiral blade of the screw 202 is between 15 mm and 50 mm, and the outer diameter and pitch of the spiral blade gradually increase from the end close to the second driving mechanism 203 to the other end. The setting of the screw 202 not only makes the dispersion effect of the slurry better, but also facilitates the output of the dispersed slurry.

[0051] Furthermore, the stirring paddle is a double planetary paddle, and at this time the mixer 1 is a double planetary mixer. It should be noted that the double planetary paddle adopts the structure in the prior art and will not be elaborated in detail here.

[0052] In one embodiment, the number of the mixers 1 is one or more, and the screw extruder 2 can be a single-screw extruder or a twin-screw extruder.

[0053] The process of preparing the battery slurry by the battery slurry preparation device will be described below:

[0054] First step: Premix the active material, conductive agent and rubber powder in a premixing tank and enter the double planetary mixer through the first stirring feed port 1011;

[0055] Second step: The glue solution enters the double planetary mixer 1 through the second stirring feed port 1012;

[0056] Third step: The solvent enters the double planetary mixer 1 through the third stirring feed port 1013;

[0057] Fourth step: Perform a kneading step in the double planetary mixer through double planetary paddles of different sizes;

[0058] Fifth step: The solvent enters the double planetary mixer 1 through the third stirring feed port 1013 again;

[0059] Sixth step: Perform a dilution step in the double planetary mixer through the double planetary paddle;

[0060] Step 7: The diluted slurry is evenly fed into the first dispersion chamber 2011 by means of screw feeding of the screw conveyor.

[0061] Step 8: A dispersion step is carried out in the first dispersion chamber 2011.

[0062] Step 9: A binder and a solvent are added into the second dispersion chamber 2012 through the dispersion feed port 4.

[0063] Step 10: Carrying out a dispersion step in the second dispersion chamber 2012 can adjust the solid content of the slurry.

[0064] Using the above battery slurry preparation device can not only prepare the positive electrode slurry, but also prepare the negative electrode slurry. The solid content of the prepared positive electrode slurry is 0 - 75%, the solid content of the negative electrode slurry is 0 - 67%, the fineness of the positive electrode slurry is 12μm - 40μm, the fineness of the negative electrode slurry is 25μm - 60μm, the viscosity of the positive electrode slurry is 3000Pa·s - 30000mPa·s, and the viscosity of the negative electrode slurry is 3000Pa·s - 25000mPa·s. Before the powder enters the screw extruder 2, kneading of the powder and the solvent is carried out in the double planetary mixer, which greatly shortens the length of the screw 202. The double planetary paddle of the double planetary mixer has a simple structure, reducing the volume of the kneading double planetary mixer. The double planetary mixer and the twin-screw extruder use an upper and lower layer structure, greatly shortening the slurry transportation distance. The slurry at the discharge port of the double planetary mixer uses spiral feeding, with a simple structure and an increased feeding speed.

[0065] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery slurry preparation device, characterized in that: include: A mixer (1) comprises a mixing tank (101), a plurality of mixing paddles and a first driving mechanism, wherein the mixing tank (101) has a plurality of mixing inlets and outlets, the plurality of mixing paddles are arranged in the mixing tank (101), and the first driving mechanism drives the mixing paddles to move so as to knead and dilute the slurry; A screw extruder (2) is arranged below the mixer (1), the screw extruder (2) comprising a dispersion barrel (201), a screw (202) and a second driving mechanism (203), the dispersion barrel (201) having a feed opening, a first dispersion chamber (2011), a second dispersion chamber (2012), a dispersion feed port (2013) and a discharge opening, the feed opening being in communication with the first dispersion chamber (2011), the dispersion feed port (2013) being in communication with the second dispersion chamber (2012), the screw (202) being arranged in the dispersion barrel (201), and one end of the screw (202) passing through the dispersion barrel (201) and connected to the first driving mechanism; A feeding component (3) has an upper end connected to the discharge port and a lower end connected to the feed opening.

2. The battery slurry preparation device according to claim 1, characterized in that: The stirring paddle comprises a blade, and a surface of the blade has a plurality of protrusions (104).

3. The battery slurry preparation device according to claim 2, characterized in that: The protrusion (104) is hemispherical.

4. The battery slurry preparation device according to claim 3, characterized in that: The diameter of the protrusion (104) is 5mm-50mm, and the distance between two adjacent protrusions (104) is 8mm-60mm.

5. The battery slurry preparation device according to any one of claims 1 to 4, characterized in that: The feeding component (3) is a screw conveyor.

6. The battery slurry preparation device according to any one of claims 1 to 4, characterized in that: The distance between the bottom of the stirring paddle and the bottom of the stirring tank (101) is 5 mm to 10 mm.

7. The battery slurry preparation device according to any one of claims 1 to 4, characterized in that: The stirring paddles include a middle stirring paddle (102) and an edge stirring paddle (103); The middle stirring paddle (102) is arranged at the middle of the stirring tank (101), and the edge stirring paddle (103) is arranged at the side of the middle stirring paddle (102).

8. The battery slurry preparation device according to any one of claims 1 to 4, characterized in that: The pitch of the spiral blade of the screw (202) is between 15 mm and 50 mm, and the outer diameter and the pitch of the spiral blade gradually increase from one end close to the second driving mechanism (203) to the other end.

9. The battery slurry preparation device according to claim 7, characterized in that: The minimum distance between the edge stirring paddle (103) and the tank wall of the stirring tank (101) is 8 mm to 15 mm.

10. The battery slurry preparation device according to claim 7, characterized in that: The ratio of the width to the height of the middle stirring paddle (102) is (1.5-3):1, and the ratio of the width to the height of the edge stirring paddle (103) is 1:(4-6).

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