Stirring tank for dispersing battery materials

Abstract

The utility model provides a stirring tank for dispersing battery materials, which comprises a stirring barrel, a stirring shaft, a stirring shaft and a stirring shaft, the cylinder wall scraper is arranged in the stirring barrel, a scraper blade of the cylinder wall scraper is parallel to the cylinder wall and used for scraping battery materials on the cylinder wall, the cylinder wall scraper comprises a first end face connected with the scraper blade, a plurality of first blades extend out of the first end face, and first blades of the first blades are back to the first end face and are perpendicular to the scraper blade. The utility model aims to provide a stirring tank for dispersing battery materials, which at least ensures the dispersity of the materials and reduces the stirring time.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of stirring tank for dispersing battery material. BACKGROUND

[0002] The production of battery includes the preparation of positive and negative active material layer, including using stirring tank to mix, disperse material (active material, polymer binder, conductive agent etc.), there is the problem of material accumulation in the current mixing process, and the large particles of material in the accumulated area are difficult to be dispersed. SUMMARY

[0003] In view of the problems in the related art, the utility model aims to provide a stirring tank for dispersing battery material, which at least ensures the dispersibility of the material while reducing the stirring time.

[0004] To achieve the above object, the utility model provides a kind of stirring tank for dispersing battery material, comprising: stirring barrel, around the first rotation axis rotation, stirring barrel includes cylinder wall;Cylinder wall scraper, it is set in stirring barrel, the scraper blade of cylinder wall scraper is parallel to cylinder wall, for scraping battery material on cylinder wall, cylinder wall scraper includes the first end surface of connecting scraper blade, multiple first blades extend from the first end surface, and the first blade of the first blade is opposite to the first end surface and is perpendicular to scraper blade.

[0005] In some embodiments, the stirring tank further comprises: a dispersion disc arranged in the stirring barrel and rotating around a second rotation axis, the rotation direction of the dispersion disc being the same as that of the stirring barrel, and the first end surface facing the dispersion disc.

[0006] In some embodiments, the rotation speed of the dispersion disc is greater than that of the stirring barrel.

[0007] In some embodiments, a gap exists between the first blade and the cylinder wall.

[0008] In some embodiments, the cylinder wall scraper comprises a second end surface opposite to the scraper blade, and a first side surface connecting the first end surface and the second end surface, multiple second blades extending from the position of the first side surface connected to the second end surface, and the second blade of the second blade being opposite to the first side surface and perpendicular to the scraper blade.

[0009] In some embodiments, the width of the second blade is greater than that of the first blade, and the width of the second blade is the distance between the first side surface and the second blade, and the width of the first blade is the distance between the first end surface and the first blade.

[0010] In some embodiments, the multiple first blades are arranged in a direction parallel to the scraper blade, and the multiple second blades are arranged in a direction parallel to the scraper blade.

[0011] In some embodiments, the first plurality of blades have a uniform first spacing therebetween, and the second plurality of blades have a uniform second spacing therebetween.

[0012] In some embodiments, the second spacing is less than the first spacing.

[0013] In some embodiments, the mixing tank is used in a dry mixing process.

[0014] The beneficial technical effects of the present application are as follows:

[0015] When the barrel wall scraper scrapes the material on the barrel wall, it scrapes down a whole strip, which is not conducive to the dispersion of large particles. The embodiment of the present application adds a first blade to the edge of the barrel wall scraper, which can divide the whole strip of material scraped down by the barrel wall scraper to divide the large particles therein and accelerate the dispersion of the large particles. Moreover, since the barrel wall scraper continuously scrapes the material on the barrel wall, a shear band is formed between the barrel wall scraper and the material on the barrel wall, which is not easy to cause the first blade to adhere to the material, thereby ensuring that the first blade can always cut the material. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0017] Figures 1 to 3 A mixing tank of the prior art is shown, Figure 2 and Figure 3 Each component is drawn as transparent to show the hidden structure, and Figure 2 and Figure 3 Different angle mixing tanks are shown.

[0018] Figure 4 Simulation results when using a mixing tank of the prior art for dry mixing are shown.

[0019] Figure 5 Simulation results when only the stirring barrel rotates are shown.

[0020] Figure 6 A perspective view of a mixing tank for dispersing battery material according to a first embodiment of the present application is shown.

[0021] Figure 7 A perspective view of a mixing tank for dispersing battery material according to a second embodiment of the present application is shown.

[0022] Figure 8 A perspective view of a mixing tank for dispersing battery material according to a third embodiment of the present application is shown. Figure 7enlarged view of the A region in FIG. 1. DETAILED DESCRIPTION

[0023] For better understanding of the spirit of the embodiments of the present application, the following further describes the same in conjunction with some preferred embodiments of the present application.

[0024] Embodiments of the present application will be described in detail below. Throughout the specification, like or similar components and components having like or similar functions are denoted by like reference numerals. The embodiments described herein with reference to the accompanying drawings are illustrative in nature, diagrammatic and are provided to give an overall understanding of the present application. The embodiments of the present application should not be construed as limiting the present application.

[0025] As used herein, the terms "approximately," "substantially," "about," and "generally" are used to describe and account for small variations. When utilized in connection with an event or circumstance, the terms can refer to instances in which the event or circumstance occurs exactly, as well as instances in which the event or circumstance occurs with a minor approximation.

[0026] In this specification, relative terms such as "central," "longitudinal," "lateral," "forward," "rearward," "rightward," "leftward," "internal," "external," "lower," "higher," "horizontal," "vertical," "above," "below," "top," "bottom," and derivatives thereof (e.g., "horizontally," "downwardly," "upwardly," etc.) should be construed to refer to the orientation as then described or as shown in the drawing under discussion. These relative terms are for convenience of description only and do not require that the application be practiced with the particular orientation described or shown.

[0027] For ease of description, "first," "second," "third," etc. can be used herein to distinguish between different components of a figure or series of figures. The "first," "second," "third," etc. are not intended to describe corresponding components.

[0028] Figures 1 to 3 A prior art stirred tank 1 is shown, comprising a stirred barrel 2, a disperser disc 3, a cylinder wall scraper 4 and a bottom scraper 5, Figure 2 and Figure 3 The parts are drawn transparent to show the occluded structure, and Figure 2 and Figure 3 Different angles of the stirred tank 1 are shown. Figure 4 Simulation results when using the prior art stirred tank 1 for dry mixing are shown. Figure 5The simulation result is shown when only the stirring barrel 2 rotates. In dry mixing, the large particles formed by the binder 6 (e.g. polytetrafluoroethylene (PTFE)) that causes the accumulation problem have to be broken into small particles and uniformly mixed into the main material. When the binder 6 accumulation problem as shown in Figure 4 and Figure 5 The only way to solve the problem is to extend the stirring time and rely on the binder 6 to randomly hit the dispersion disc 3, and then the dispersion disc 3 breaks the large particles.

[0029] Figure 6 A perspective view of a stirring tank 100 for dispersing battery materials (e.g. binder in powder form) according to the first embodiment of the present application is shown. Figure 7 A perspective view of a stirring tank 100 for dispersing battery materials according to the second embodiment of the present application is shown. Figure 6 and Figure 7 The components are drawn transparently to show the obstructed structures. Figure 8 An enlarged view of the A area in Figure 7 is shown.

[0030] In the first and second embodiments, the stirring tank 100, e.g. used in a dry mixing process (the basic process is to dry mix active material, conductive agent and binder, etc.; add an appropriate amount of solvent to wet; add solvent to disperse and break; dilute to adjust viscosity), includes a stirring barrel 10, a dispersion disc 20, a cylinder wall scraper 30 and a cylinder bottom scraper 70. The stirring barrel 10 rotates around a first rotation axis, and includes a cylinder bottom 16 and a cylinder wall 14 connected to the periphery of the cylinder bottom 16. The dispersion disc 20 is arranged in the stirring barrel 10 and rotates around a second rotation axis. The rotation speed of the dispersion disc 20 is greater than that of the stirring barrel 10. The stirring barrel 10 rotates slowly, and the dispersion disc 20 rotates at high speed to break the materials as much as possible and improve the dispersibility of the materials. The cylinder wall scraper 30 is arranged in the stirring barrel 10, and the scraper blade 32 of the cylinder wall scraper 30 is parallel to the cylinder wall 14, which is used to scrape the battery materials on the cylinder wall 14.

[0031] In the first and second embodiments, the cylinder wall scraper 30 includes a first end surface 34 connected to the scraper blade 32, the first end surface 34 faces the cylinder wall 14, and a plurality of first blades 60 are arranged on the first end surface 34. The first blade 60 has a first blade edge opposite to the first end surface 34 and perpendicular to the scraper blade 32. When the cylinder wall scraper of the prior art embodiment scrapes the materials on the cylinder wall, it scrapes a whole strip, which is not conducive to the dispersion of large particles therein. The embodiment of the present application adds the first blade 60 to the edge of the cylinder wall scraper 30, which can divide the whole strip of materials scraped by the cylinder wall scraper 30 to divide the large particles therein and accelerate the dispersion of the large particles. Moreover, since the cylinder wall scraper 30 continuously scrapes the materials on the cylinder wall 14, a shear band is formed between the cylinder wall scraper 30 and the materials on the cylinder wall 14, which is not easy to cause the materials to adhere to the first blade 60, thereby ensuring that the first blade 60 can always cut the materials.

[0032] In the first and second embodiments, the rotation direction of the dispersing disc 20 is the same as the rotation direction of the stirring barrel 10, for example, both rotate in the clockwise direction, and the first end surface 34 faces the dispersing disc 20. When the large particles of material are driven by the high-speed rotation of the dispersing disc 20 and hit the barrel wall scraper 30, the first blades 60 can cut the large particles, thereby accelerating the dispersion of the large particles. The first blades 60 have a gap with the barrel wall 14 to avoid scratching the barrel wall 14.

[0033] In the second embodiment, referring to Figure 7 and Figure 8 , the barrel wall scraper 30 includes a second end surface 36 opposite the scraper blade 32, and a first side surface 38 connecting the first end surface 34 and the second end surface 36. A plurality of second blades 62 are arranged at the position of the first side surface 38 connected to the second end surface 36, and the second blade 62 has a second blade edge opposite the first side surface 38. The first side surface 38 of the barrel wall scraper 30 connecting the outer edge of the second end surface 36 is a high-speed flow area of the material, and the material driven by the dispersing disc 20 hits the barrel wall scraper 30 and slides from the outer edge. The second blades 62 with the second blade edge perpendicular to the scraper blade 32 are arranged in the high-speed flow area of the material, which can disperse the large particles in the material into small particles without affecting the flow of the material, thereby improving the dispersibility of the material and facilitating the subsequent fiberization (small particle binder completes fiberization).

[0034] The width of the second blade 62 (the distance between the first side surface 38 and the second blade edge, i.e., the size of the second blade 62 extending relative to the first side surface 38) is greater than the width of the first blade 60 (the distance between the first end surface 34 and the first blade edge, i.e., the distance of the first blade 60 extending relative to the first end surface 34). The width of the first blade 60 is limited to avoid scratching the barrel wall 14, and the second blade 62 can be wider than the first blade 60 to accelerate the dispersion of the material. The plurality of first blades 60 are arranged on the first end surface 34 in a direction parallel to the scraper blade 32, and the plurality of second blades 62 are arranged on the first side surface 38 in a direction parallel to the scraper blade 32. Therefore, the arrangement direction of the first blade 60 and the arrangement direction of the second blade 62 are substantially perpendicular to the flow direction of the material, which is beneficial to the dispersion effect of the material. The plurality of first blades 60 have a consistent first spacing, and the plurality of second blades 62 have a consistent second spacing, so that the large particles in the material can be broken and divided more uniformly. The second spacing between the second blades 62 is smaller than the first spacing between the first blades 60, and the first spacing between the first blades 60 is larger because the density of the material scraped by the scraper blade 32 is larger, and the first spacing is larger to avoid affecting the flow of the material while dividing the material. At the second blade 62, the density of the material is smaller, so the second spacing between the second blades 62 can be appropriately reduced to improve the dispersibility of the material.

[0035] Embodiments of the present application improve the dispersibility of the material by providing the first blade 60 and / or the second blade 62 at the edge of the cylinder wall scraper 30 to divide the large particles in the material.

[0036] The above is only preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A stirring tank for dispersing battery materials, characterized in that, include: A mixing tank that rotates about a first rotation axis, the mixing tank including a cylindrical wall; A wall scraper is installed inside the mixing tank, with its blade parallel to the cylinder wall, for scraping off the battery material from the cylinder wall. The cylinder wall scraper includes a first end face connected to the scraper blade, and a plurality of first blades extend from the first end face, wherein the first cutting edge of the first blade faces away from the first end face and is perpendicular to the scraper blade.

2. The mixing tank for dispersing battery materials according to claim 1, characterized in that, Also includes: A dispersion disc is disposed inside the mixing tank and rotates about a second rotation axis. The direction of rotation of the dispersion disc is the same as that of the mixing tank, and the first end face faces the dispersion disc.

3. The mixing tank for dispersing battery materials according to claim 2, characterized in that, The rotational speed of the dispersion disc is greater than that of the mixing tank.

4. The mixing tank for dispersing battery materials according to claim 1, characterized in that, There is a gap between the first blade and the cylinder wall.

5. The mixing tank for dispersing battery materials according to claim 2, characterized in that, The cylinder wall scraper includes a second end face facing away from the scraper blade and a first side face connecting the first end face and the second end face. A plurality of second blades extend from the first side face at the position connected to the second end face, and the second blades of the second blades face away from the first side face and are perpendicular to the scraper blade.

6. The mixing tank for dispersing battery materials according to claim 5, characterized in that, The width of the second blade is greater than the width of the first blade. The width of the second blade is the distance between the first side surface and the second cutting edge. The width of the first blade is the distance between the first end face and the first cutting edge.

7. The mixing tank for dispersing battery materials according to claim 5, characterized in that, The plurality of first blades are arranged in a direction parallel to the blade edge of the scraper, and the plurality of second blades are arranged in a direction parallel to the blade edge of the scraper.

8. The mixing tank for dispersing battery materials according to claim 7, characterized in that, The plurality of first blades have a consistent first spacing, and the plurality of second blades have a consistent second spacing.

9. The mixing tank for dispersing battery materials according to claim 8, characterized in that, The second spacing is smaller than the first spacing.

10. The mixing tank for dispersing battery materials according to claim 1, characterized in that, The mixing tank is used for dry mixing processes.

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