Battery positive and negative electrode slurry stirring device

Abstract

The application discloses a battery positive and negative electrode slurry stirring device and belongs to the technical field of battery slurry stirring. A plurality of fishbone-shaped flow-cutting plates connected to support rods are arranged in a slurry stirring assembly of the battery positive and negative electrode slurry stirring device, and a main flow-cutting plate, at least one group of upper flow-cutting pieces and at least one group of lower flow-cutting pieces are arranged in each fishbone-shaped flow-cutting plate. In this way, a transverse shear laminar flow is formed through the main flow-cutting plate, and then a double longitudinal net-shaped shear flocculation flow is formed through a plurality of upper inclined flow-cutting pieces arranged in the upper flow-cutting pieces and a plurality of lower inclined flow-cutting pieces arranged in the lower flow-cutting pieces, so that the shear intensity of the slurry during stirring can be effectively increased, the slurry is more likely to reach turbulent flow, the flow state of the slurry is improved, the uniformity and dispersion effect of the slurry stirring are ensured, the time required for stirring can be shortened, manpower can be saved, and the effect of reducing the cost is achieved.

Description

Technical Field

[0001] This application relates to the field of battery slurry mixing technology, and in particular to a battery positive and negative electrode slurry mixing device. Background Technology

[0002] As the first process in battery electrode fabrication, slurry preparation is a major factor determining the quality of both positive and negative electrode sheets, and is the core of electrode fabrication. Problems in slurry preparation directly affect the quality of coated electrodes and battery cells. Agglomeration caused by uneven dispersion during the homogenization process; if the prepared slurry has poor dispersion (uneven dispersion of active materials, conductive agents, and binders), it will lead to uneven dispersion of various components on the surface of the subsequently prepared electrodes, resulting in poor consistency of the battery cells. Utility Model Content

[0003] This application provides a battery positive and negative electrode slurry mixing device. It can solve the problem of poor slurry preparation effect in the prior art. The technical solution is as follows: On the one hand, a battery positive and negative electrode slurry mixing device is provided, the battery positive and negative electrode slurry mixing device includes: a tank, a slurry mixing component and a drive component; The slurry mixing assembly is installed inside the tank. The slurry mixing assembly includes: a support rod and a plurality of fishbone-shaped flow cutters arranged in an array along the length of the support rod. Each fishbone-shaped flow cutter has a main flow cutter, at least one set of upper flow cutters, and at least one set of lower flow cutters. One end of the main flow cutter is fixedly connected to the side of the support rod. The at least one set of upper flow cutters and the at least one set of lower flow cutters are respectively located on the top and bottom surfaces of the main flow cutter and fixed at opposite ends of the main flow cutter. The opposite ends of the main flow cutter are distributed on both sides of the support rod. Each set of upper flow cutters and each set of lower flow cutters includes a plurality of upper oblique flow vanes and a plurality of lower oblique flow vanes arranged in an array along the extension direction of the corresponding end of the main flow cutter. The plurality of main flow cutters are arranged in parallel. The plurality of upper oblique flow vanes in each set of upper flow cutters are arranged in parallel and inclined toward the support rod. The plurality of lower oblique flow vanes in each set of lower flow cutters are arranged in parallel and inclined toward the support rod. The drive assembly is mounted on the upper part of the tank and configured to be connected to the support rod to drive multiple fishbone-shaped flow cutters to revolve synchronously around the central axis in the tank.

[0004] Optionally, the end edge of the main flow plate that is not connected to the support rod is in a flat elliptical shape; the end edge of the upper oblique flow plate that is not connected to the main flow plate is in a flat elliptical shape; and the end edge of the lower oblique flow plate that is not connected to the main flow plate is in a flat elliptical shape.

[0005] Optionally, the connection points between the multiple upper oblique cut blades and the main cut plate in each group of upper cut flow components are arranged alternately with the connection points between the multiple lower oblique cut blades and the main cut plate in each group of lower cut flow components.

[0006] Optionally, the angle between the upper oblique blade and the main oblique blade is in the range of 45 degrees to 60 degrees; the angle between the lower oblique blade and the main oblique blade is in the range of 45 degrees to 60 degrees.

[0007] Optionally, the distance between two adjacent upper oblique cut blades is equal, and the distance between two adjacent lower oblique cut blades is equal.

[0008] Optionally, the distance between two adjacent upper oblique cut vanes is d, and the width of the orthographic projection of the upper oblique cut vane on the main cut vane plate is d1, where 2mm≤d-d1≤100mm; the distance between two adjacent lower oblique cut vanes is d2, and the width of the orthographic projection of the lower oblique cut vane on the main cut vane plate is d3, where 2mm≤d2-d3≤100mm.

[0009] Optionally, the distance between two adjacent main flow plates is equal.

[0010] Optionally, the distance between two adjacent main flow plates ranges from 10 mm to 500 mm.

[0011] Optionally, the battery positive and negative electrode slurry mixing device further includes: a wall scraper, one side of which is fixedly connected to the support rod and is disposed opposite to the plurality of fishbone-shaped flow cutting plates; wherein the wall scraper is distributed between the plurality of fishbone-shaped flow cutting plates and the inner wall of the tank and is in contact with the inner wall of the tank.

[0012] Optionally, the slurry mixing assembly further includes: a planetary box, two sets of dispersion discs, and a stirring paddle. The planetary box is installed on the upper part of the tank body. The two sets of dispersion discs are respectively located at the two edges of the planetary box. The stirring paddle is located between the two sets of dispersion discs, and both sets of dispersion discs and the stirring paddle are drivenly connected to the planetary box. The fishbone-shaped flow cutter is close to the inner wall of the tank body relative to the dispersion discs.

[0013] The beneficial effects of the technical solutions provided in this application include at least the following: By incorporating multiple herringbone-shaped shrouds connected to support rods in the slurry mixing assembly of a battery positive and negative electrode slurry mixing device, each herringbone-shaped shroud includes a main shroud, at least one set of upper shrouds, and at least one set of lower shrouds. This creates a transverse shear laminar flow through the main shroud, and further forms a dual longitudinal mesh-like shear turbulent flow through the multiple upper oblique shrouds in the upper shrouds and the multiple lower oblique shrouds in the lower shrouds. This effectively increases the shear strength of the slurry during mixing, making it easier for the slurry to achieve turbulence, improving the slurry's flow state, ensuring uniformity and dispersion, shortening mixing time, saving manpower, and ultimately reducing costs. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a top view of a battery positive and negative electrode slurry mixing device provided in an embodiment of this application; Figure 2 This is a partial front view of a battery positive and negative electrode slurry mixing device provided in an embodiment of this application; Figure 3 yes Figure 2 The image shows a right view of the battery positive and negative electrode slurry mixing device; Figure 4 yes Figure 2 The diagram shows a top view of the battery positive and negative electrode mixing apparatus.

[0016] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0018] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0019] Among related technologies, the dual planetary stirring process is the most important and widely used process for battery slurry homogenization. The stirring paddles employ planetary motion, meaning 2-3 slow-speed paddles simultaneously revolve (around the central axis of the mixing tank) and rotate (around their own axes) within the mixing tank, their motion covering the entire space of the tank. Some equipment is equipped with high-speed dispersing paddles (such as toothed discs), which generate strong shearing action through high-speed rotation (linear velocity can reach 30-50 m / s), further dispersing the slurry. The dual planetary stirring process uses the shearing, convection, and diffusion effects of the paddles to mix active materials, conductive agents, binders, and other materials with the solvent into a uniform solid-liquid suspension slurry. However, it suffers from limited dispersion uniformity, with only the tip area of ​​the stirring paddle experiencing strong shearing action, easily leading to "dead zones" and uneven local dispersion, particularly insufficient dispersion capability for nanoscale materials (such as high specific surface area conductive agents).

[0020] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 This is a top view of a battery positive and negative electrode slurry mixing device provided in an embodiment of this application. Figure 2 This is a partial front view of a battery positive and negative electrode slurry mixing device provided in an embodiment of this application. Figure 3 yes Figure 2 The right view of the battery positive and negative electrode slurry mixing device is shown. Figure 4 yes Figure 2 The diagram shows a top view of a battery positive and negative electrode slurry mixing device. The battery positive and negative electrode slurry mixing device may include: a tank 100, a slurry mixing assembly 200, and a drive assembly 300.

[0021] The slurry mixing assembly 200 in the battery positive and negative electrode slurry mixing device can be installed inside the tank 100. The slurry mixing assembly 200 may include: a support rod 201 and a plurality of fishbone-shaped flow cutters 202 arranged in an array along the length of the support rod 201. Each fishbone-shaped flow cutter 202 may have a main flow cutter 202a, at least one set of upper flow cutters, and at least one set of lower flow cutters. One end of the main flow cutter 202a may be fixedly connected to the side of the support rod 201. At least one set of upper flow cutters and at least one set of lower flow cutters may be located on the top and bottom surfaces of the main flow cutter 202a respectively and fixed at opposite ends of the main flow cutter 202a. The opposite ends of the main flow cutter 202a are distributed on both sides of the support rod 201. Each group of upper and lower flow-cutting components includes multiple upper oblique flow-cutting blades 202b and multiple lower oblique flow-cutting blades 202c arranged in an array along the extension direction of the corresponding main flow-cutting plate 202a. The main flow-cutting plates 202a are arranged in parallel. The multiple upper oblique flow-cutting blades 202b in each group of upper flow-cutting components are arranged in parallel and inclined towards the support rod 201. Similarly, the multiple lower oblique flow-cutting blades 202c in each group of lower flow-cutting components are arranged in parallel and inclined towards the support rod 201. For example, the main flow-cutting plate 202a can be arranged perpendicular to the support rod 201, or it can be arranged inclined relative to the support rod 201. It should be noted that in actual use, the support rod 201 can be placed vertically inside the tank 100, or it can be rotated 90 degrees and then placed horizontally inside the tank 100.

[0022] The drive assembly 300 can be mounted on the upper part of the tank 100 and configured to be connected to the support rod 201 to drive multiple fishbone-shaped flow cutters 202 to revolve synchronously around the central axis of the tank 100. Here, the support rod 201 can be an acid and alkali resistant steel metal structure. The fishbone-shaped flow cutters 202 can be made of acid and alkali resistant silicone, rubber, or acid and alkali resistant steel metal.

[0023] In this embodiment, multiple fishbone-shaped shearing plates 202 connected to a support rod 201 are provided in the slurry mixing assembly of the battery positive and negative electrode slurry mixing device. Each fishbone-shaped shearing plate 202 is provided with a main shearing plate 202a, at least one set of upper shearing elements, and at least one set of lower shearing elements. In this way, a transverse shear laminar flow is formed by the main shearing plate 202a, and a double longitudinal mesh shear turbulent flow is formed by the multiple upper oblique shearing blades 202b provided in the upper shearing elements and the multiple lower oblique shearing blades 202c provided in the lower shearing elements. This can effectively increase the shear strength of the slurry during mixing, making it easier for the slurry to achieve turbulence, improving the flow state of the slurry, ensuring the uniformity and dispersion effect of the slurry mixing, and shortening the mixing time, saving manpower, and thus achieving the effect of reducing costs.

[0024] In summary, this application provides a battery positive and negative electrode slurry mixing device, which may include: a tank, a slurry mixing assembly, and a drive assembly. By arranging multiple herringbone-shaped slitting plates connected to a support rod in the slurry mixing assembly of the battery positive and negative electrode slurry mixing device, each herringbone-shaped slitting plate contains a main slitting plate, at least one set of upper slitting elements, and at least one set of lower slitting elements, a transverse shear laminar flow is formed by the main slitting plate. Furthermore, the multiple upper oblique slitting elements in the upper slitting elements and the multiple lower oblique slitting elements in the lower slitting elements form a dual longitudinal mesh shear turbulent flow. This effectively increases the shear strength of the slurry during mixing, making it easier for the slurry to achieve turbulence, improving the flow state of the slurry, ensuring the uniformity and dispersion effect of the slurry mixing, and shortening the mixing time, saving manpower, and thus reducing costs.

[0025] Optional, such as Figure 2 As shown, the end edge of the main tangential flow plate 202a that is not connected to the support rod 201 can be a flattened elliptical shape. The end edge of the upper oblique flow plate 202b that is not connected to the main tangential flow plate 202a can also be a flattened elliptical shape. The end edge of the lower oblique flow plate 202c that is not connected to the main tangential flow plate 202a is also a flattened elliptical shape. This further effectively increases the shear strength of the slurry during stirring, making it easier for the slurry to achieve turbulence and improving its flow state. Here, the outer boundary shape of the main tangential flow plate 202a, the upper oblique flow plate 202b, and the lower oblique flow plate 202c can all be square. The elliptical tip angle of the main tangential flow plate 202a, the upper oblique flow plate 202b, and the lower oblique flow plate 202c can all be 10 to 30 degrees.

[0026] In the embodiments of this application, such as Figure 2 As shown, the connection points between the multiple upper oblique cutting blades 202b and the main cutting plate 202a in each group of upper cutting flow elements, and the connection points between the multiple lower oblique cutting blades 202c and the main cutting plate 202a in each group of lower cutting flow elements, are arranged alternately. This creates an interlaced mesh structure, forming a transverse shear laminar flow through the main cutting plate 202a, and further forming a double longitudinal mesh shear turbulent flow through the upper oblique cutting blades 202b and lower oblique cutting blades 202c. This effectively increases the shear strength of the slurry during mixing, making it easier for the slurry to achieve turbulence and improving its flow state.

[0027] Optional, such as Figure 2As shown, the angle α1 between the upper oblique-cut vane 202b and the main oblique-cut vane 202a ranges from 45 degrees to 60 degrees. For example, the angle α1 between the upper oblique-cut vane 202b and the main oblique-cut vane 202a can be 45 degrees, 55 degrees, or 60 degrees. The angle α2 between the lower oblique-cut vane 202c and the main oblique-cut vane 202a also ranges from 45 degrees to 60 degrees. For example, the angle α2 between the lower oblique-cut vane 202c and the main oblique-cut vane 202a can be 45 degrees, 55 degrees, or 60 degrees.

[0028] In this embodiment, the distance between two adjacent upper oblique-cut vanes 202b can be equal, and the distance between two adjacent lower oblique-cut vanes 202c can be equal. Alternatively, the distance between two adjacent upper oblique-cut vanes 202b can also be equal to the distance between two adjacent lower oblique-cut vanes 202c. This ensures good mixing uniformity of the slurry by the fishbone-shaped flow plate 202.

[0029] In this application, as Figure 2 and Figure 3 As shown, the distance between two adjacent upper oblique-cut vanes 202b can be d, and the width of the orthographic projection of the upper oblique-cut vane 202b onto the main tangential plate 202a is d1, where 2mm ≤ d - d1 ≤ 100mm. The distance between two adjacent lower oblique-cut vanes 202c is d2, and the width of the orthographic projection of the lower oblique-cut vane 202c onto the main tangential plate 202a is d3, where 2mm ≤ d2 - d3 ≤ 100mm. This ensures good mixing uniformity of the slurry by the fishbone-shaped tangential plate 202. Here, the width of the orthographic projection of multiple upper oblique-cut vanes 202b in each group of upper tangential components onto the main tangential plate 202a can be equal, and the width of the orthographic projection of multiple lower oblique-cut vanes 202c in each group of lower tangential components onto the main tangential plate 202a can also be equal.

[0030] Optional, such as Figure 2 and Figure 3 As shown, the distance between two adjacent main tangential flow plates 202a can be equal. For example, the distance between two adjacent main tangential flow plates 202a can range from 10 mm to 500 mm. Here, the distance between two adjacent main tangential flow plates 202a can be h1, the height of the upper oblique tangential flow plate 202b can be h2, and the height of the lower oblique tangential flow plate 202c can be h3. The distance h1 between two adjacent main tangential flow plates 202a can be greater than the height h2 of the upper oblique tangential flow plate 202b and the height h3 of the lower oblique tangential flow plate 202c. Wherein, 3 mm ≤ h1 - h2 ≤ 30 mm, and 3 mm ≤ h1 - h3 ≤ 30 mm. Here, the height h2 of the upper oblique tangential flow plate 202b and the height h3 of the lower oblique tangential flow plate 202c can be equal. This ensures good mixing uniformity of the slurry by the herringbone-shaped tangential flow plates 202.

[0031] In the embodiments of this application, such as Figure 1 and Figure 4 As shown, the battery positive and negative electrode slurry mixing device may further include: a scraper blade 400, one side of which is fixedly connected to the support rod 201 and is disposed opposite to a plurality of fishbone-shaped flow-cutting plates 202. The scraper blade 400 is distributed between the plurality of fishbone-shaped flow-cutting plates 202 and the inner wall of the tank 100 and is in contact with the inner wall of the tank 100. Thus, by integrating the scraper blade 400 and the fishbone-shaped flow-cutting plates 202 onto the support rod 201, space for installing internal components of the tank 100 can be saved, and the integration level of the mixing device can be improved. The scraper blade 400 can be made of acid and alkali resistant silicone or rubber. For example, the scraper blade 400 is in the shape of a slanted trapezoid, with one pointed end directly contacting the inner wall of the tank 100.

[0032] It should be noted that the scraper blade 400 can also be set separately from the fishbone-shaped flow cutter 202 and driven by an independent drive component to revolve, and is always in contact with the inner wall of the tank 100.

[0033] Optional, such as Figure 1 As shown, the slurry mixing assembly 200 also includes: a planetary gearbox (not shown), two sets of dispersion discs 203, and a stirring paddle 204. The planetary gearbox can be installed on the upper part of the tank 100. The two sets of dispersion discs 203 are located at the two edges of the planetary gearbox, and the stirring paddle 204 is located between the two sets of dispersion discs 203. Both sets of dispersion discs 203 and the stirring paddle 204 are connected to the planetary gearbox via a transmission. The fishbone-shaped shroud plate 202 is close to the inner wall of the tank 100 relative to the dispersion discs 203. In this way, the slurry rotates at high speed under the rotation of the stirring paddle 204 and the gear-type dispersion discs 203, and then forms a transverse shear laminar flow through the main shroud plate 202a. Furthermore, it forms a double longitudinal mesh shear turbulent flow through the upper oblique shroud plate 202b and the lower oblique shroud plate 202c. This can effectively increase the shear strength of the slurry during mixing, making it easier for the slurry to achieve turbulence, improving the flow state of the slurry, and shortening the mixing time, saving manpower, and thus reducing costs. Here, with both the scraper blade 400 and the fishbone-shaped flow cutter 202 mounted on the support rod 201, the scraper blade 400 is generally positioned near the dispersion disc 203, and its rotational speed is greater than or equal to the revolution speed of the stirring device (e.g., the stirring paddle and the dispersion disc), but much less than the rotational speed of the dispersion disc 203.

[0034] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0035] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery positive and negative electrode slurry mixing device, characterized in that, include: Tank body, slurry mixing assembly, and drive assembly; The slurry mixing assembly is installed inside the tank. The slurry mixing assembly includes: a support rod and a plurality of fishbone-shaped flow cutters arranged in an array along the length of the support rod. Each fishbone-shaped flow cutter has a main flow cutter, at least one set of upper flow cutters, and at least one set of lower flow cutters. One end of the main flow cutter is fixedly connected to the side of the support rod. The at least one set of upper flow cutters and the at least one set of lower flow cutters are respectively located on the top and bottom surfaces of the main flow cutter and fixed at opposite ends of the main flow cutter. The opposite ends of the main flow cutter are distributed on both sides of the support rod. Each set of upper flow cutters and each set of lower flow cutters includes a plurality of upper oblique flow vanes and a plurality of lower oblique flow vanes arranged in an array along the extension direction of the corresponding end of the main flow cutter. The plurality of main flow cutters are arranged in parallel. The plurality of upper oblique flow vanes in each set of upper flow cutters are arranged in parallel and inclined toward the support rod. The plurality of lower oblique flow vanes in each set of lower flow cutters are arranged in parallel and inclined toward the support rod. The drive assembly is mounted on the upper part of the tank and configured to be connected to the support rod to drive multiple fishbone-shaped flow cutters to revolve synchronously around the central axis in the tank.

2. The battery positive and negative electrode slurry mixing device according to claim 1, characterized in that, The end edge of the main flow plate that is not connected to the support rod is in a flat elliptical shape; the end edge of the upper oblique flow plate that is not connected to the main flow plate is in a flat elliptical shape; and the end edge of the lower oblique flow plate that is not connected to the main flow plate is in a flat elliptical shape.

3. The battery positive and negative electrode slurry mixing device according to claim 1 or 2, characterized in that, The connection points between the multiple upper oblique cut blades and the main cut plate in each group of upper cut flow components are arranged alternately with the connection points between the multiple lower oblique cut blades and the main cut flow plate in each group of lower cut flow components.

4. The battery positive and negative electrode slurry mixing device according to claim 3, characterized in that, The angle between the upper oblique flow vane and the main flow plate ranges from 45 degrees to 60 degrees; the angle between the lower oblique flow vane and the main flow plate ranges from 45 degrees to 60 degrees.

5. The battery positive and negative electrode slurry mixing device according to claim 4, characterized in that, The distance between two adjacent upper oblique cut blades is equal, and the distance between two adjacent lower oblique cut blades is equal.

6. The battery positive and negative electrode slurry mixing device according to claim 5, characterized in that, The distance between two adjacent upper oblique cut vanes is d, and the width of the orthographic projection of the upper oblique cut vane on the main cut vane plate is d1, where 2mm≤d-d1≤100mm; the distance between two adjacent lower oblique cut vanes is d2, and the width of the orthographic projection of the lower oblique cut vane on the main cut vane plate is d3, where 2mm≤d2-d3≤100mm.

7. The battery positive and negative electrode slurry mixing device according to claim 5, characterized in that, The distance between two adjacent main flow plates is equal.

8. The battery positive and negative electrode slurry mixing device according to claim 7, characterized in that, The distance between two adjacent main flow plates ranges from 10 mm to 500 mm.

9. The battery positive and negative electrode slurry mixing device according to claim 3, characterized in that, The battery positive and negative electrode slurry mixing device further includes: a wall scraper, one side of which is fixedly connected to the support rod and is arranged opposite to the plurality of fishbone-shaped flow cutting plates; wherein, the wall scraper is distributed between the plurality of fishbone-shaped flow cutting plates and the inner wall of the tank and is in contact with the inner wall of the tank.

10. The battery positive and negative electrode slurry mixing device according to claim 9, characterized in that, The slurry mixing assembly further includes: a planetary box, two sets of dispersion discs and a stirring paddle. The planetary box is installed on the upper part of the tank. The two sets of dispersion discs are located at the two edges of the planetary box. The stirring paddle is located between the two sets of dispersion discs. The two sets of dispersion discs and the stirring paddle are all connected to the planetary box in a driving manner. The fishbone-shaped flow cutter plate is close to the inner wall of the tank relative to the dispersion discs.

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