A mixing device for preparing negative electrode slurry of lithium battery

Abstract

The present invention discloses a mixing device for preparing negative electrode slurry of lithium battery, including a mixing shell, a shell support frame, a stirring motor, a motor spindle, a motor fixing frame, a stirring shaft, a wiring cavity, a graphite feed pipe, a feed pipe, a mixing plate, a wiring tube cavity, a mixing inlet, a mixing pipe, a PTC heating block, a stirring blade and a discharge pipe. The present invention has a reasonable structural design, and uses mixing pipes with different inclination directions on different mixing plates to increase the flow direction of graphite and adhesive solution during the stirring and mixing process, improve the compatibility efficiency and fluidity between graphite and adhesive solution during the stirring process, and the graphite and adhesive solution are evenly heated by the PTC heating block in the process of flowing through the mixing pipe, providing a more suitable environment for the dispersion of graphite and adhesive solution.

Description

Technical Field

[0001] The invention relates to a lithium battery production auxiliary equipment, in particular to a mixing device for preparing lithium battery negative electrode slurry, belonging to the technical field of lithium battery production equipment application. Background Art

[0002] "Lithium battery" is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. Due to the advantages of lithium batteries such as relatively high energy, long service life, low self-discharge rate and light weight, lithium batteries are widely used in all walks of life.

[0003] In the production process of lithium batteries, the configuration of negative electrode slurry accounts for a large proportion. In the preparation process of negative electrode slurry, graphite and binder solution need to be dispersed to complete the pretreatment of negative electrode slurry raw materials. Traditional graphite dispersing and stirring devices have a single stirring direction and poor efficiency. At the same time, most of them lack a structure that can evenly heat graphite and binder solution. Therefore, in view of the above problems, a mixing device for preparing negative electrode slurry of lithium batteries is proposed. Summary of the invention

[0004] The purpose of the present invention is to provide a mixing device for preparing negative electrode slurry of lithium battery in order to solve the above problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical scheme: a mixing device for preparing negative electrode slurry of lithium battery, comprising a mixing shell and a stirring motor fixedly connected by a motor fixing frame, wherein the stirring motor is fixedly connected to the top of the mixing shell, and a motor main shaft is installed on the output end of the mixing shell, and the end of the motor main shaft is connected to the stirring shaft through a coupling, and the end of the stirring shaft passes through the top side wall of the mixing shell and extends to the bottom of the inner cavity of the mixing shell, and a graphite feed pipe and a feed pipe are respectively installed on both sides of the stirring motor, and the ends of the graphite feed pipe and the feed pipe are both connected to the inner cavity of the mixing shell, and a discharge pipe is installed at the center of the bottom end of the mixing shell;

[0006] The stirring shaft is located in the inner cavity of the mixing shell, and four mixing plates distributed in a ring are installed on the top of the surface, and a stirring blade is installed on the surface of the stirring shaft at the bottom of the mixing plate. A number of mixing inlets are evenly distributed on the surface of the mixing plate, and one end of the mixing inlet is connected with a mixing pipe, the mixing pipe is fixed to the surface of the mixing plate, and the side wall of the mixing pipe and the surface of the mixing board are both embedded with PTC heating blocks, a wiring cavity for wiring is arranged inside the stirring shaft, and the wiring cavity is connected to the wiring tube cavity inside the side wall of the mixing plate through the connection between the mixing plate and the stirring shaft.

[0007] Preferably, the mixing tube is a tubular structure with two ends connected, and the PTC heating block on the mixing tube is connected in parallel with the PTC heating block on the mixing plate.

[0008] Preferably, the stirring blade is a stirring blade with a spiral structure sleeved on the surface of the stirring shaft.

[0009] Preferably, gate valves are provided on the surfaces of the graphite feed pipe, feed pipe and discharge pipe, and the graphite feed pipe and feed pipe are fixedly connected to the top end surface of the mixing shell.

[0010] Preferably, the mixing plate is welded to the surface of the stirring shaft, and the mixing pipes on the surfaces of two adjacent mixing plates are arranged to be inclined toward one side of the stirring motor and toward one side of the discharge pipe, respectively.

[0011] Preferably, the stirring motor and the PTC heating block are both externally connected to a power supply and a controller.

[0012] The beneficial effects of the present invention are as follows: the present invention has a reasonable structural design, and utilizes mixing tubes with different inclination directions on different mixing plates to increase the flow direction of graphite and adhesive solution during the stirring and mixing process, thereby improving the compatibility efficiency and fluidity between the graphite and the adhesive solution during the stirring process; the graphite and the adhesive solution are evenly heated by the PTC heating block in the process of flowing through the mixing tube, thereby providing a more suitable environment for the dispersion of the graphite and the adhesive solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0014] Figure 2 It is a schematic diagram of the structure of the mixing plate and the mixing pipe of the present invention.

[0015] In the figure: 1. mixing shell, 2. shell support frame, 3. stirring motor, 301. motor spindle, 4. motor fixing frame, 5. stirring shaft, 501. wiring cavity, 6. graphite feed pipe, 7. feed pipe, 8. mixing plate, 801. wiring tube cavity, 9. mixing inlet, 10. mixing pipe, 11. PTC heating block, 12. stirring blade, 13. discharge pipe. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1-2As shown, a mixing device for preparing negative electrode slurry of lithium battery comprises a mixing shell 1 and a stirring motor 3 fixedly connected by a motor fixing frame 4, wherein the stirring motor 3 is fixedly connected to the top of the mixing shell 1, and a motor main shaft 301 is installed on the output end of the mixing shell 1, and the end of the motor main shaft 301 is connected to the stirring shaft 5 through a coupling, and the end of the stirring shaft 5 passes through the top side wall of the mixing shell 1 and extends to the bottom end of the inner cavity of the mixing shell 1, and the rotation of the motor main shaft 301 on the output end of the stirring motor 3 drives the rotation of the stirring shaft 5, thereby driving the mixing plate 8 and the stirring blade 12 on the surface of the stirring shaft 5 to rotate, and the material inside the mixing shell 1 is stirred by the rotation of the mixing plate 8 and the stirring blade 12, and graphite feed pipe 6 and feed pipe 7 are respectively installed on both sides of the stirring motor 3, and the ends of the graphite feed pipe 6 and feed pipe 7 are connected to the inner cavity of the mixing shell 1, and a discharge pipe 13 is installed at the center of the bottom end of the mixing shell 1;

[0018] The stirring shaft 5 is located at the top of the surface of the inner cavity of the mixing shell 1, and four mixing plates 8 distributed in an annular manner are installed, and a stirring blade 12 is installed on the surface of the stirring shaft 5 at the bottom of the mixing plate 8. A plurality of mixing inlets 9 are evenly distributed on the surface of the mixing plate 8, and one end of the mixing inlet 9 is matched and connected with a mixing tube 10, and the mixing tube 10 is fixedly connected to the surface of the mixing plate 8. When the mixing plate 8 rotates, the graphite and adhesive solution enter one end of the mixing tube 10 from the mixing inlet 9, and the graphite and adhesive solution entering the mixing tube 10 flow out from the other end of the mixing tube 10. The mixing tube 10 provides a smaller contact space for the graphite and adhesive solution, thereby improving the dispersion efficiency of the graphite and adhesive solution. The side wall of the mixing tube 10 and the surface of the mixing plate 8 are both embedded with a PTC heating block 11. When the graphite and adhesive solution flow When passing through the narrow space inside the mixing tube 10, the PTC heating block 11 is used to heat the graphite and the adhesive solution so that the graphite and the adhesive solution are heated evenly. A wiring cavity 501 for wiring is arranged inside the stirring shaft 5. The wiring cavity 501 is connected to the wiring tube cavity 801 inside the side wall of the mixing plate 8 through the connection between the mixing plate 8 and the stirring shaft 5. That is, the wire for supplying power to the PTC heating block 11 has the wiring cavity 501 and the wiring tube cavity 801 embedded and distributed inside the stirring shaft 5 and the mixing plate 8, and does not directly contact the material, which effectively avoids damage to the wire used for power supply, thereby improving the safety performance of the entire device.

[0019] As a technical optimization solution of the present invention, the mixing pipe 10 is a tubular structure with both ends connected, which is convenient for materials to enter and exit the mixing pipe 10, and the PTC heating block 11 on the mixing pipe 10 is connected in parallel with the PTC heating block 11 on the mixing plate 8, which is convenient for simultaneously opening and closing the mixing pipe 10 and the PTC heating block 11 on the mixing plate 8.

[0020] As a technical optimization solution of the present invention, the stirring blade 12 is a stirring blade 12 with a spiral structure sleeved on the surface of the stirring shaft 5. The material is stirred by the stirring blade 12 with a spiral structure, and the forward and reverse rotation of the stirring blade 12 is used to turn the material in the vertical direction.

[0021] As a technical optimization solution of the present invention, gate valves are arranged on the surfaces of the graphite feed pipe 6, feed pipe 7 and discharge pipe 13, and the graphite feed pipe 6 and feed pipe 7 are fixedly connected to the top end surface of the mixing shell 1 to facilitate loading and unloading.

[0022] As a technical optimization scheme of the present invention, the mixing plate 8 is welded on the surface of the stirring shaft 5, and the mixing tubes 10 on the surfaces of two adjacent mixing plates 8 are respectively inclined toward one side of the stirring motor 3 and toward one side of the discharge pipe 13, that is, the mixing tubes 10 on the surfaces of two adjacent mixing plates 8 are inclined in opposite directions, so that the material passing through the mixing tubes 10 on the surfaces of two adjacent mixing plates 8 forms convection, thereby improving the stirring efficiency.

[0023] As a technical optimization solution of the present invention, the stirring motor 3 and the PTC heating block 11 are both externally connected to a power supply and a controller, which provide a structural basis for the energy supply of the stirring motor 3 and the PTC heating block 11. The controller is a conventionally known intelligent control device, such as a computer.

[0024] When the present invention is in use, graphite and adhesive solution are respectively fed into the mixing shell 1 through the graphite feed pipe 6 and the feed pipe 7, the stirring motor 3 is started through the controller, and the rotation of the motor main shaft 301 on the output end of the stirring motor 3 drives the rotation of the stirring shaft 5, thereby driving the mixing plate 8 and the stirring blade 12 on the surface of the stirring shaft 5 to rotate, and the material inside the mixing shell 1 is stirred by the rotation of the mixing plate 8 and the stirring blade 12.

[0025] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0026] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A mixing device for preparing negative electrode slurry for lithium batteries, comprising a mixing housing (1) and a stirring motor (3) fixedly connected via a motor fixing frame (4), characterized in that: The stirring motor (3) is fixedly connected to the top of the mixing shell (1), and a motor main shaft (301) is installed on the output end of the mixing shell (1). The end of the motor main shaft (301) is connected to the stirring shaft (5) through a coupling. The end of the stirring shaft (5) passes through the top side wall of the mixing shell (1) and extends to the bottom of the inner cavity of the mixing shell (1). A graphite feed pipe (6) and a feed pipe (7) are respectively installed on both sides of the stirring motor (3), and the ends of the graphite feed pipe (6) and the feed pipe (7) are both connected to the inner cavity of the mixing shell (1). A discharge pipe (13) is installed at the center of the bottom end of the mixing shell (1); gate valves are arranged on the surfaces of the graphite feed pipe (6), the feed pipe (7) and the discharge pipe (13), and the graphite feed pipe (6) and the feed pipe (7) are fixedly connected to the top end surface of the mixing shell (1); The stirring shaft (5) is located in the inner cavity of the mixing shell (1) and is provided with four mixing plates (8) distributed in an annular shape on its top surface, and a mixing blade (12) is provided on the surface of the stirring shaft (5) at the bottom end of the mixing plate (8). A plurality of mixing inlets (9) are evenly distributed on the surface of the mixing plate (8), and one end of the mixing inlet (9) is matched and connected with a mixing pipe (10), the mixing pipe (10) is fixedly connected to the surface of the mixing plate (8), and the side wall of the mixing pipe (10) and the surface of the mixing plate (8) are both fitted with A PTC heating block (11) is provided inside the stirring shaft (5) with a wiring cavity (501) for wiring, and the wiring cavity (501) is connected to a wiring tube cavity (801) inside the side wall of the mixing plate (8) through a connection between the mixing plate (8) and the stirring shaft (5); the mixing plate (8) is welded to the surface of the stirring shaft (5), and the mixing tubes (10) on the surfaces of two adjacent mixing plates (8) are inclined respectively toward one side of the stirring motor (3) and toward one side of the discharge tube (13).

2. A mixing device for preparing negative electrode slurry for lithium batteries according to claim 1, characterized in that: The mixing pipe (10) is a tubular structure with two ends connected, and the PTC heating block (11) on the mixing pipe (10) is connected in parallel with the PTC heating block (11) on the mixing plate (8).

3. A mixing device for preparing negative electrode slurry for lithium battery according to claim 1, characterized in that: The stirring blade (12) is a stirring blade (12) with a spiral structure sleeved on the surface of the stirring shaft (5).

4. A mixing device for preparing negative electrode slurry for lithium battery according to claim 1, characterized in that: The stirring motor (3) and the PTC heating block (11) are both externally connected to a power source and a controller.

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