A slurry mixing and dispersing device for lithium battery slurry

Abstract

The application discloses a slurry mixing and dispersing device for lithium battery slurry, which comprises a cylinder for containing powder materials and solvents, an openable or closable cylinder cover arranged at the opening of the cylinder, a dispersing assembly arranged in the cylinder, a driving assembly for driving the dispersing assembly to rotate to complete the dispersion of the lithium battery slurry, and a control mechanism communicatively connected with the driving assembly. In this way, the dispersion space of the materials is reduced, the shearing capacity between the materials and between the materials and the inner wall of the cavity is improved, the dispersion efficiency of the existing nanomaterials is greatly improved, the energy consumption of the device is reduced, the slurry mixing and dispersion efficiency is improved, and the slurry is uniformly dispersed and mixed.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery manufacturing technology, and in particular to a slurry mixing and dispersion device for lithium battery slurry. Background Technology

[0002] In the manufacturing of lithium-ion battery electrodes, the positive electrode slurry consists of binders, conductive agents, and positive electrode materials; the negative electrode slurry consists of binders and graphite carbon powder. With the continuous advancement of lithium-ion battery materials, the particle size of raw materials is becoming increasingly smaller. This not only improves the performance of lithium-ion batteries but also makes them highly susceptible to secondary agglomeration, thus increasing the difficulty of the mixing and dispersion process. Controlling the microstructure inside the electrode sheet is a key technology in the lithium-ion battery production process. Therefore, during the preparation of electrode sheets, it is essential to control the mixing and dispersion quality of the lithium-ion battery slurry to improve its uniformity and dispersion stability.

[0003] The slurry mixing and dispersion process in lithium-ion batteries has a greater than 30% impact on product quality in the entire lithium-ion battery production process, making it the most crucial step. The preparation of both positive and negative electrode slurries involves a series of processes, including mixing, dissolving, and dispersing liquids with liquids and liquids with solids. The dispersibility and uniformity of the particulate active materials directly affect the movement of lithium ions between the battery electrodes. Therefore, the mixing and dispersion of the slurry materials for each electrode is of paramount importance in lithium-ion battery production. The quality of slurry dispersion directly impacts the quality of subsequent lithium-ion battery production and its performance. With the continuous innovation of lithium battery materials, including the emergence of nanomaterials such as single-walled carbon nanotubes, lithium manganese iron phosphate, and Si-C nanocomposites, the dispersion capabilities of lithium-ion battery slurries face significant challenges.

[0004] Existing lithium-ion battery slurry dispersion is generally achieved using mixing equipment and dispersers, which results in low slurry and dispersion efficiency. Furthermore, most existing slurry mixing and dispersion equipment is too simple and prone to uneven dispersion and mixing. Summary of the Invention

[0005] To address the technical problems existing in the background art, the present invention proposes a slurry mixing and dispersion device for lithium battery slurry.

[0006] This invention proposes a slurry mixing and dispersion device for lithium battery materials, comprising a cylinder for holding powder materials and solvents, wherein the opening of the cylinder is provided with an openable or closable cylinder cover, and further comprising:

[0007] The dispersion component is located inside the cylinder.

[0008] A driving component is used to drive the dispersing component to rotate in order to complete the dispersion of the lithium battery slurry;

[0009] A control mechanism is communicatively connected with the driving assembly.

[0010] Preferably, the dispersion assembly comprises a dispersion cavity, the upper and lower openings of the dispersion cavity are respectively provided with upper and lower covers capable of being opened or closed, and a plurality of rotatable dispersion discs are arranged in the dispersion cavity.

[0011] Preferably, the driving assembly comprises a first driving mechanism for driving the rotation of the dispersion discs and a second driving mechanism for driving the rotation of the dispersion cavity.

[0012] Preferably, a revolving disc is arranged at the upper end of the cylinder body, the dispersion cavity is fixed to the lower end of the revolving disc through a plurality of steel rods, the second driving mechanism is a revolving motor, and the revolving motor is used to control the rotating speed of the revolving disc.

[0013] Preferably, the first driving mechanism comprises a dispersion motor and a dispersion screw rod, one end of the dispersion screw rod is connected to the output end of the dispersion motor, the other end is connected to the dispersion disc, and the dispersion screw rod is used to be fixedly connected to the revolving disc.

[0014] Preferably, the driving assembly further comprises a first lifting motor capable of driving the lifting of the upper cover and the lower cover to open or close the upper and lower openings of the dispersion cavity, the first lifting motor is connected to the upper cover and the lower cover through a first lifting screw rod respectively, when the first lifting motor rotates forward, the lower cover is closed and the upper cover is opened, and when the first lifting motor rotates reversely, the upper cover is closed and the lower cover is opened.

[0015] Preferably, four position sensors are fixedly arranged on the dispersion screw rod, the four position sensors are respectively used to sense and control the closing and limiting of the upper cover and the lower cover, an upper position sensor is used to control the upper limit position of the upper cover, two middle position sensors are used to sense the closing and opening actions of the upper cover and the lower cover, and a lower position sensor is used to control the lower limit position of the lower cover.

[0016] Preferably, a stirring paddle is further fixed to the lower end of the revolving disc, and the stirring paddle is arranged in a spaced manner with the dispersion cavity.

[0017] Preferably, a second lifting motor communicatively connected with the control mechanism is further arranged for driving the lifting of the cylinder cover, the second lifting motor is connected to the cylinder cover through a second lifting screw rod, and the rotation of the second driving motor can drive the upward movement of the cylinder cover to open the opening of the cylinder body or the downward movement of the cylinder cover to close the opening of the cylinder body.

[0018] Preferably, the cross-sectional shape of the dispersion cavity is annular.

[0019] In summary, the present application has the following effects: first, by opening the cylinder cover, the dispersed components in the cylinder are in a sealed state, the nanomaterial to be dispersed at high speed is added, and a small amount of solvent is added, then some low specific surface area and easily dispersed materials are added to the cylinder, and the required solvent is added to set the solid content, and the stirring and dispersion are started by controlling the mechanism according to the process setting of the revolution and dispersion speed of the dispersion component. After the nanomaterial is dispersed to the set time, the upper cover and the lower cover of the dispersion cavity are controlled to reach the upper limit and the lower limit respectively by the control mechanism, the materials in the cylinder and the materials in the dispersion cavity are mixed, and the mixed slurry enters the dispersion cavity with an annular side wall. In the small dispersion space, the material particles are subjected to high-speed friction and shear between the material particles and the inner wall of the dispersion cavity, so that the materials are quickly and efficiently mixed. In this way, the dispersion space of the materials is reduced, the shear ability between the materials and the inner wall of the cavity is improved, the dispersion efficiency of the existing nanomaterial is greatly improved, the energy consumption of the equipment is reduced, the mixing and dispersion efficiency is improved, and the slurry is uniformly dispersed and mixed.

[0020] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The figure is a schematic diagram of the overall structure of the lithium battery slurry mixing and dispersing device of the embodiment of the present application.

[0022] In the figure:

[0023] 1, cylinder; 2, cylinder cover; 3, dispersion cavity; 4, upper cover; 5, lower cover; 6, dispersion disc; 7, revolution disc; 8, steel rod; 9, revolution motor; 10, dispersion motor; 11, dispersion screw; 12, first lifting motor; 13, first lifting screw; 14, upper position sensor; 15, middle position sensor; 16, lower position sensor; 17, stirring paddle; 18, second lifting motor; 19, second lifting screw. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application.

[0025] As Figure 1 shown, the present embodiment proposes a lithium battery slurry mixing and dispersing device, which comprises a cylinder 1 for containing powder materials and solvents, an openable or closable cylinder cover 2 is arranged at the opening of the cylinder 1, and further comprising:

[0026] A dispersion assembly is arranged in the cylinder body 1 and used for completing dispersion of the slurry;

[0027] A driving assembly is used for driving the dispersion assembly to rotate so as to complete dispersion of the lithium battery slurry.

[0028] A control mechanism is communicatively connected with the driving assembly.

[0029] Further, a second lifting motor 18 used for driving the cylinder cover 2 to lift is communicatively connected with the control mechanism, the second lifting motor 18 is connected with the cylinder cover 2 through a second lifting screw rod 19, and the cylinder cover 2 can be driven to move upward to open the opening of the cylinder body 1 or move downward to close the opening of the cylinder body 1 through rotation of the second driving motor.

[0030] Further, the dispersion assembly comprises a dispersion cavity 3, upper and lower openings of the dispersion cavity 3 are respectively provided with an upper cover 4 and a lower cover 5 capable of being opened or closed, and a plurality of rotatable dispersion discs 6 are arranged in the dispersion cavity 3. Figure 1 As shown in the figure, the dispersion cavity 3 is vertically arranged at the bottom end of the cylinder body 1, and an axis of the dispersion cavity 3 is parallel to an axis of the cylinder body 1.

[0031] Further, a revolving disc 7 is arranged at the upper end of the cylinder body 1, the dispersion cavity 3 is fixed to the lower end of the revolving disc 7 through a plurality of steel rods 8, specifically, the dispersion cavity 3 is fixed to the revolving disc 7 through three steel rods 8, the steel rods 8 are vertically arranged at the bottom wall of the cylinder body 1, and the three steel rods 8 are distributed along the circumference of the dispersion cavity 3, a second driving mechanism is a revolving motor 9, and the revolving motor 9 is used for controlling the rotating speed of the revolving disc 7.

[0032] It should be noted that, in order to complete stirring of the slurry, a stirring paddle 17 is further fixed to the lower end of the revolving disc 7, the stirring paddle 17 is arranged in a spaced manner with the dispersion cavity 3, and the stirring paddle 17 is driven to rotate in the cylinder body 1 through revolution of the revolving disc 7, so as to complete stirring of the slurry. Meanwhile, the stirring paddle 17 can also scrape the cylinder body 1.

[0033] Specifically, the first driving mechanism comprises a dispersion motor 10 and a dispersion screw rod 11, one end of the dispersion screw rod 11 is connected with an output end of the dispersion motor 10, and the other end is connected with the dispersion disc 6, the dispersion screw rod 11 is used for fixedly connected with the revolving disc 7, and the dispersion motor 10 controls the rotating speed of the dispersion disc 6 by controlling the rotating speed of the dispersion screw rod 11.

[0034] In the embodiment, the driving assembly further comprises a first lifting motor 12 capable of driving the upper cover 4 and the lower cover 5 to lift, so as to open or close the upper and lower openings of the dispersion cavity 3. The first lifting motor 12 is connected with the upper cover 4 and the lower cover 5 through a first lifting screw rod 13 respectively. When the first lifting motor 12 rotates forward, the lower cover 5 is closed and the upper cover 4 is opened. When the first lifting motor 12 rotates reversely, the upper cover 4 is closed and the lower cover 5 is opened. Specifically, the upper cover 4 and the lower cover 5 of the dispersion cavity 3 can be controlled by manually inputting signals to the control mechanism. Meanwhile, the bottom end of the stirring paddle 17, the dispersion screw rod 11 and the first lifting screw rod 13 is 8-10 cm away from the bottom of the cylinder body 1, and the specific distance can be determined according to the situation. The revolution speed of the revolution motor 9 in the embodiment can be set as 0-36 rpm, which is adjustable by frequency conversion. The dispersion speed of the dispersion motor 10 can be set as 0-3600 rpm, the linear speed is 0-26 m / s, which is adjustable by frequency conversion.

[0035] It should be noted that, through negative pressure test practice, the sealing performance of the cylinder cover 2, the cylinder body 1, the dispersion cavity 3, the upper cover 4 and the lower cover 5 reaches-90 to-99 Kpa.

[0036] Further, four position sensors are fixed on the dispersion screw rod 11, which respectively sense and control the closing and limiting of the upper cover 4 and the lower cover 5. The upper position sensor 14 is used to control the upper limit position of the upper cover 4, the middle two position sensors are used to sense the closing and opening actions of the upper cover 4 and the lower cover 5, and the lower position sensor 16 is used to control the lower limit position of the lower cover 5. When the upper cover 4 moves downward to the closing position of the upper cover 4, the lower cover 5 is in the closed state of the closing position. Conversely, when the lower cover 5 moves upward to the closing position of the lower cover 5, the upper cover 4 is in the closed state of the closing position. The lower position sensor 16 controls the lower limit position of the lower cover 5. After the high-speed dispersion of the slurry is completed, the upper cover 4 and the lower cover 5 are manually inputted to the control mechanism to reach the upper limit position and the lower limit position at the same time. Meanwhile, when the lower cover 5 is at the lower limit position, the bottom end of the first lifting screw rod 13 is 4-5 cm away from the bottom of the cylinder body 1.

[0037] Thus, after the device is turned on, the cylinder cover 2 opening signal is manually input, the control mechanism controls the second lifting motor 18 to rise, the second lifting motor 18 drives the cylinder cover 2 to rise through the second lifting screw rod 19, at this time the cylinder body 1 opening is opened, after the cylinder cover 2 is opened, the signal is input to open the upper cover 4 of the dispersion cavity 3 to the upper limit position, at this time the lower cover 5 of the dispersion cavity 3 and the dispersion cavity 3 are in a sealed state, then the nanomaterial to be dispersed at high speed is added and a little solvent is added, the upper cover 4 of the dispersion cavity 3 is closed, some low specific surface area and easily dispersed materials are added into the cylinder body 1, and the solvent required for setting solid content is added, the previous preparation work is completed, after the device is adjusted and stabilized, the stirring and dispersion are started according to the process setting of revolution and dispersion speed. After the nanomaterial is dispersed to the set time, the signal is manually input to drive the first lifting motor 12 to act, the upper cover 4 and the lower cover 5 of the dispersion cavity 3 reach the upper limit position and the lower limit position respectively, the materials in the cylinder body 1 and the materials in the high-speed dispersion cavity 3 are mixed, and the mixed slurry enters the dispersion cavity 3 with an annular side wall, in the small dispersion space, the materials are quickly and efficiently mixed under the high-speed friction and shearing between the material particles and the annular side wall. Thus, the dispersion space of the materials is reduced, the shearing capacity between the materials and the inner wall of the cavity is improved, the dispersion efficiency of the existing nanomaterial is greatly improved, the energy consumption of the device is reduced, the slurry mixing and dispersion efficiency is improved, and the slurry is uniformly dispersed and mixed.

[0038] In summary, the stirring paddle 17, the dispersion screw rod 11, the steel rod 8 connected with the dispersion cavity 3 and the first lifting screw rod 13 will not collide with each other, nor with the cylinder body 1 and the dispersion cavity 3.

[0039] It should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0041] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", and the like should be construed broadly and can be, for example, fixed connections, detachable connections, or integral; can be mechanical connections, electrical connections, or communication with each other; can be direct connections, or indirect connections through an intermediate medium; can be internal communication of two elements or interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0043] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A slurry mixing and dispersing device for lithium battery slurry, comprising a cylinder for holding powder materials and solvent, wherein the opening of the cylinder is provided with an openable or closable cylinder cover, characterized in that, Also included are: The dispersion component is located inside the cylinder. A driving component is used to drive the dispersing component to rotate in order to complete the dispersion of the lithium battery slurry; A control mechanism communicatively connected to the drive component; The dispersion component includes a dispersion chamber, with an upper cover and a lower cover that can be opened or closed at the upper and lower openings of the dispersion chamber, and a plurality of rotatable dispersion discs inside the dispersion chamber. The drive assembly includes a first drive mechanism for driving the dispersion disk to rotate and a second drive mechanism for driving the dispersion cavity to rotate. The drive assembly further includes a first lifting motor capable of driving the upper cover and the lower cover to lift and lower open to open or close the upper and lower openings of the dispersion chamber. The first lifting motor is connected to the upper cover and the lower cover respectively via a first lifting screw. When the first lifting motor rotates in the forward direction, the lower cover is closed and the upper cover is opened. When the first lifting motor rotates in the reverse direction, the upper cover closes and the lower cover opens.

2. The lithium battery slurry mixing and dispersing equipment according to claim 1, characterized in that, It also includes a revolving disk located at the upper end of the cylinder body, and the dispersion chamber is fixed to the lower end of the revolving disk by multiple steel rods. The second drive mechanism is a revolving motor, which is used to control the rotational speed of the revolving disk.

3. The lithium battery slurry mixing and dispersing equipment according to claim 2, characterized in that, The first driving mechanism includes a dispersing motor and a dispersing screw. One end of the dispersing screw is connected to the output end of the dispersing motor, and the other end is connected to the dispersing disk. The dispersing screw is used to be fixedly connected to the revolving disk.

4. The lithium battery slurry mixing and dispersing equipment according to claim 3, characterized in that, Four position sensors are fixed on the dispersing screw. The four position sensors respectively sense and control the closing and limiting of the upper cover and the lower cover. The upper position sensor is used to control the upper limit position of the upper cover, the two middle position sensors are used to sense the opening and closing action of the upper cover and the conveying lower cover, and the lower position sensor is used to control the lower limit position of the lower cover.

5. The lithium battery slurry mixing and dispersing equipment according to claim 2, characterized in that, A stirring paddle is also fixed at the lower end of the revolving disk, and the stirring paddle is spaced apart from the dispersion chamber.

6. The lithium battery slurry mixing and dispersing equipment according to claim 1, characterized in that, It also includes a second lifting motor that is communicatively connected to the control mechanism for driving the cylinder head to rise and fall. The second lifting motor is connected to the cylinder head via a second lifting screw. The rotation of the second driving motor can drive the cylinder head to move upward to open the cylinder opening or move downward to close the cylinder opening.

7. The lithium battery slurry mixing and dispersing equipment according to claim 1, characterized in that, The dispersion cavity has an annular cross-sectional shape.

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