Preparation method of dispersing agent for positive electrode slurry of lithium ion battery

Abstract

The invention discloses a preparation method of a dispersing agent for lithium ion battery positive electrode slurry, and belongs to the field of dispersants.The device comprises a base table plate, a bearing is arranged on the side wall of the base table plate, an outer ring of the bearing is fixedly connected with the side wall of the base table plate, and a grinding shell is arranged on one side of the base table plate; an expansion frame is arranged on the side wall, facing the bearing, of the grinding shell, a steering shaft is arranged on the side wall of the expansion frame, and a grinding inner container is rotationally arranged in the middle of the grinding shell. When the grinding device is used, a sealing cover plate at one end of the grinding shell is opened, at the moment, an electric push rod drives a driving motor to fall down until a butt joint shaft at the output end of the driving motor is in butt joint with a square box, the driving motor drives a grinding inner container to rotate to conduct grinding operation, and after materials are completely blended into a cavity below the grinding shell, the materials are fully ground; and the torsion motor drives the grinding shell to turn by 180 degrees for processing again.

Description

Technical Field

[0001] The invention relates to the field of dispersants, and in particular to a method for preparing a dispersant for lithium ion battery positive electrode slurry. Background Art

[0002] With the development of industrial technology, modern dispersant technology has become more and more perfect. As a dispersant, it needs to have the same density as particles or powders and not react chemically. The density of battery positive electrode slurry is similar to that of water, and there are many types of battery positive electrode slurry, which requires a dispersant that can adjust the density.

[0003] Secondly, the previous method of making dispersants is relatively complicated. The densities of the various component materials of the dispersant are different, which makes it easy for the components to stratify when mixed together. It requires very strong stirring to fully disperse the various component materials of the dispersant. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing a dispersant for positive electrode slurry of lithium-ion batteries. When the device is in use, the docking shaft and the square box at the output end of the driving motor are docked together, and the driving motor drives the grinding inner tank to rotate for grinding. When all the materials are integrated into the chamber below the grinding outer shell, the electric push rod drives the driving motor to rise, and the twisting motor drives the grinding outer shell to rotate 180 degrees for processing again to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for preparing a dispersant for a lithium ion battery positive electrode slurry, comprising the following steps:

[0006] S1. Prepare 100 parts of an organic solvent by mass, wherein methyl pyrrolidone is selected as an organic solvent, and the methyl pyrrolidone is placed inside a reaction box and heated to 60 degrees Celsius, and 1 part of a pH regulator is added to the inside of the reaction box, wherein the pH regulator is a solution of hydrochloric acid and nitric acid;

[0007] S2. Add polyester components, polyesters include triglycerol, polyethylene glycol and acetone.

[0008] A preparation device for a method for preparing a dispersant for positive electrode slurry of a lithium ion battery comprises a base plate, a bearing is arranged on the side wall of the base plate, an outer ring of the bearing is fixedly connected to the side wall of the base plate, a grinding shell is arranged on one side of the base plate, an expansion frame is arranged on the side wall of the grinding shell facing the bearing, a steering shaft is arranged on the side wall of the expansion frame, the steering shaft is inserted in the inner ring of the bearing, and the steering shaft is connected to the output end of a torsion motor; a grinding liner is rotatably arranged in the middle of the grinding shell, a wire groove is arranged in an annular array on the outer wall of the grinding liner, an elastic strip is movably installed inside the wire groove, the elastic strip and the inner side wall of the wire groove are connected by a reset spring, the outer edge of the elastic strip is attached to the inner side wall of the grinding shell, the upper and lower ends of the grinding liner are both provided with movable shafts, the upper and lower ports of the grinding shell are both provided with sealing cover plates, a through hole matching the movable shaft is arranged in the middle of the sealing cover plate, the movable shaft is connected to a conversion motor, and a stirring assembly is arranged below the base plate.

[0009] The conversion motor includes a cantilever bridge at the top of the base plate, an electric push rod is arranged at the top of the cantilever bridge, a driving motor is arranged on the output rod of the electric push rod, a docking shaft is arranged at the output end of the driving motor, a square box is arranged at the top of the movable shaft, and a docking channel matching the cross-section of the docking shaft is arranged on the inner side of the movable shaft.

[0010] The cross sections of the docking channel and the docking shaft are square, and the side length of the cross section of the docking channel is greater than the side length of the cross section of the docking shaft by two millimeters.

[0011] The edges of the docking channel and the docking shaft are both provided with arc chamfers, and the surfaces of the docking channel and the docking shaft are coated with lubricating oil.

[0012] The stirring assembly includes an extension platform at the bottom of the base plate, a stirring box is arranged at the bottom end of the extension platform, six rollers are rotatably arranged on the inner wall of the stirring box, and the rollers are connected by a torsion belt. The profile of the torsion belt is L-shaped, one of the rollers is installed on the output end of the stirring motor, and a stirring blade assembly is arranged on the torsion belt. A heating assembly is also arranged at the bottom end of the stirring box.

[0013] The stirring blade assembly includes an insertion eye on the side wall of the torsion belt, the thickness of the torsion belt is three millimeters, the diameter of the insertion eye is two millimeters, an insertion rod is inserted into the insertion eye, and a torsion blade is arranged at the outer end of the insertion rod.

[0014] The heating component comprises a heating platform at the bottom of the stirring box. The heating platform is a double-layer copper plate structure, and an electric heating wire is arranged in the middle of the double-layer copper plate.

[0015] In summary, due to the adoption of the above technology, the beneficial effects of the present invention are:

[0016] First, the dispersant of the present invention contains a pH regulator. If one wants to change the density of the dispersant, one can then change the pH of the dispersant to apply it to positive electrode slurries of batteries of different models.

[0017] Secondly, open the sealing cover at one end of the grinding shell. At this time, the electric push rod drives the drive motor to fall until the docking shaft at the output end of the drive motor and the square box are docked together. The drive motor drives the grinding inner tank to rotate to grind the powder. When all the materials are integrated into the chamber under the grinding shell, the electric push rod drives the drive motor to rise, and the twist motor drives the grinding shell to turn 180 degrees for another processing.

[0018] Thirdly, the stirring motor drives the torsion belt through the rollers. The torsion blades on the torsion belt can move up and down, and can also move horizontally, which increases the effect of material stirring. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a schematic diagram showing a front view of a method for preparing a dispersant for positive electrode slurry of a lithium-ion battery.

[0020] Figure 2 It is a schematic diagram of a side view of a method for preparing a dispersant for positive electrode slurry of a lithium-ion battery.

[0021] Figure 3 The present invention is a schematic diagram of a method for preparing a dispersant for lithium-ion battery positive electrode slurry and driving a motor.

[0022] Figure 4 The present invention is a schematic diagram of a sealing cover plate for preparing a dispersant for positive electrode slurry of a lithium-ion battery.

[0023] Figure 5 The present invention is a schematic diagram of a method for preparing a dispersant for positive electrode slurry of a lithium-ion battery and grinding an inner tank.

[0024] Figure 6 The present invention is a schematic diagram of an elastic strip of a method for preparing a dispersant for positive electrode slurry of a lithium-ion battery.

[0025] Figure 7 The present invention is a schematic diagram of a stirring box for preparing a dispersant for positive electrode slurry of a lithium-ion battery.

[0026] Figure 8 A schematic diagram of a twisting blade in a method for preparing a dispersant for positive electrode slurry of a lithium-ion battery.

[0027] Description of reference numerals:

[0028] Base plate 1, bearing 101, torsion motor 102, cantilever bridge 2, expansion frame 3, grinding shell 4, sealing cover plate 401, movable shaft 402, square box 403, electric push rod 5, drive motor 501, docking shaft 502, extension table 6, stirring box 7, heating table 701, torsion belt 702, stirring motor 703, roller 704, insertion rod 705, torsion blade 706, grinding liner 8, wire groove 801, elastic strip 802. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] The present invention provides a method for preparing a dispersant for a lithium ion battery positive electrode slurry, comprising the following steps:

[0031] S1. Prepare 100 parts of an organic solvent by mass, wherein methyl pyrrolidone is selected as an organic solvent, and the methyl pyrrolidone is placed inside a reaction box and heated to 60 degrees Celsius, and 1 part of a pH regulator is added to the inside of the reaction box, wherein the pH regulator is a solution of hydrochloric acid and nitric acid;

[0032] S2. Add polyester components, polyesters include triglycerol, polyethylene glycol and acetone.

[0033] like Figure 1-Figure 8As shown, a preparation device for a method for preparing a dispersant for positive electrode slurry of a lithium-ion battery comprises a base plate 1, a bearing 101 is arranged on the side wall of the base plate 1, an outer ring of the bearing 101 is fixedly connected to the side wall of the base plate 1, a grinding shell 4 is arranged on one side of the base plate 1, an expansion frame 3 is arranged on the side wall of the grinding shell 4 facing the bearing 101, a steering shaft is arranged on the side wall of the expansion frame 3, the steering shaft is inserted in the inner ring of the bearing 101, and the steering shaft is connected to the output end of the torsion motor 102; a grinding liner 8 is rotatably arranged in the middle of the grinding shell 4, a wire groove 801 is arranged in an annular array on the outer side wall of the grinding liner 8, an elastic strip 802 is movably installed inside the wire groove 801, and the elastic strip 802 and the inner part of the wire groove 801 are movably mounted on the inner side of the wire groove 801. The side walls are connected by a reset spring, and the outer edge of the elastic strip 802 fits on the inner wall of the grinding shell 4. The upper and lower ends of the grinding liner 8 are provided with movable shafts 402, and the upper and lower ports of the grinding shell 4 are provided with sealing cover plates 401. The middle of the sealing cover plate 401 is provided with a through hole matching the movable shaft 402, and the movable shaft 402 is connected to the conversion motor. A stirring assembly is provided below the base plate 1. The sealing cover plate 401 at one end of the grinding shell 4 is opened, and the grinding liner 8 is composed of two conical blocks, and then the conical block of the grinding liner 8 in the upper position can fit on the inner wall of the grinding shell 4 by its own gravity, and the twisting motor 102 drives the grinding shell 4 to turn one hundred and eighty degrees for processing again.

[0034] The conversion motor includes a cantilever bridge 2 at the top of the base plate 1, an electric push rod 5 is arranged at the top of the cantilever bridge 2, a driving motor 501 is arranged on the output rod of the electric push rod 5, a docking shaft 502 is arranged at the output end of the driving motor 501, a square box 403 is arranged at the top of the movable shaft 402, and a docking channel matching the cross-section of the docking shaft 502 is arranged on the inner side of the movable shaft 402. The electric push rod 5 drives the driving motor 501 to fall down, and the docking shaft 502 at the output end of the driving motor 501 is docked with the square box 403, so that the electric push rod 5 can drive the grinding inner tank 8 to rotate, and before the grinding shell 4 is turned one hundred and eighty degrees each time, the docking shaft 502 and the square box 403 are first separated.

[0035] The cross-sections of the docking channel and the docking shaft 502 are square, and the side length of the cross-section of the docking channel is two millimeters longer than the side length of the cross-section of the docking shaft 502. The cross-section of the docking channel is larger than the cross-section of the docking shaft 502, so that the docking shaft 502 and the square box 403 can be docked in a portable manner.

[0036] The edges of the docking channel and the docking shaft 502 are both provided with arc chamfers, and the surfaces of the docking channel and the docking shaft 502 are coated with lubricating oil. If there is a slight deviation between the square box 403 and the docking shaft 502, the arc chamfers on the docking shaft 502 and the edges of the docking channel can correct the deviation for docking.

[0037] The stirring assembly includes an extension platform 6 at the bottom of the base plate 1, and a stirring box 7 is arranged at the bottom end of the extension platform 6. Six rollers 704 are rotatably arranged on the inner wall of the stirring box 7. The rollers 704 are connected by a torsion belt 702. The profile of the torsion belt 702 is L-shaped. One of the rollers 704 is installed on the output end of the stirring motor 703. A stirring blade assembly is arranged on the torsion belt 702. A heating assembly is also arranged at the bottom end of the stirring box 7. The stirring motor 703 drives the torsion belt 702 to operate through the rollers 704. The stirring blade assembly on the torsion belt 702 can operate up and down, and can also move horizontally, thereby increasing the effect of material stirring.

[0038] The stirring blade assembly includes an insertion hole on the side wall of the torsion belt 702. The thickness of the torsion belt 702 is three millimeters, and the diameter of the insertion hole is two millimeters. An insertion rod 705 is inserted into the interior of the insertion hole, and a torsion blade 706 is provided at the outer end of the insertion rod 705. The torsion blade 706 and the insertion rod 705 are inserted into the insertion hole on the torsion belt 702. When the torsion belt 702 runs, the torsion blade 706 can have a greater stirring intensity. The staff can replace the torsion blade 706 of different sizes according to the processing needs.

[0039] The heating assembly includes a heating platform 701 at the bottom of the stirring box 7 . The heating platform 701 is a double-layer copper plate structure with a heating wire disposed in the middle of the double-layer copper plate. The heating wire inside the heating platform 701 controls the temperature of the dispersant inside the stirring box 7 .

[0040] Working principle: open the sealing cover plate 401 at one end of the grinding shell 4, and then put the grinding material in, and then the cone block of the grinding liner 8 in the upper position can fit on the inner wall of the grinding shell 4 by its own gravity, and the torsion motor 102 drives the grinding shell 4 to turn 180 degrees for processing again, and the electric push rod 5 drives the driving motor 501 to fall down, and the docking shaft 502 and the square box 403 at the output end of the driving motor 501 are docked together, and then the electric push rod 5 can drive the grinding liner 8 to rotate. Before the grinding shell 4 turns 180 degrees each time, the docking shaft 502 and the square box 403 are separated in advance, and the cross-section of the docking channel is larger than the cross-section of the docking shaft 502, which can make the docking shaft 502 and the square box 403 portable. Docking, if there is a slight deviation between the square box 403 and the docking shaft 502, the arc chamfer on the docking shaft 502 and the edge of the docking channel can correct the deviation for docking, the stirring motor 703 drives the torsion belt 702 to operate through the roller 704, the stirring blade assembly on the torsion belt 702 can operate up and down, and the stirring blade assembly can also move horizontally, which increases the effect of material stirring, the twisting blade 706 and the insertion rod 705 are inserted into the insertion eye force on the torsion belt 702, the twisting blade 706 can have a greater stirring intensity when the torsion belt 702 runs, the staff can replace the twisting blade 706 of different sizes according to the processing needs, and the electric heating wire inside the heating table 701 is used to control the temperature of the dispersant inside the mixing box 7.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

Claims

1. A method for preparing a dispersant for lithium ion battery positive electrode slurry, characterized in that: The following steps are involved: S1. According to the weight ratio, prepare 50-100 parts of an organic solvent, 0.1-1 parts of a pH regulator, 20-40 parts of a polyester component and 5-10 parts of an organic component, the organic solvent is selected from methyl pyrrolidone, the methyl pyrrolidone is placed inside the reaction chamber and heated to 60 degrees Celsius, and the pH regulator is added to the inside of the reaction chamber, the pH regulator is a solution of hydrochloric acid and nitric acid combination; S2. Add polyester components, polyesters include triglycerol, polyethylene glycol and acetone.

2. A preparation device for a method for preparing a dispersant for a positive electrode slurry of a lithium ion battery, characterized in that: The invention comprises a base plate (1), a bearing (101) is arranged on the side wall of the base plate (1), an outer ring of the bearing (101) is fixedly connected to the side wall of the base plate (1), a grinding shell (4) is arranged on one side of the base plate (1), an expansion frame (3) is arranged on the side wall of the grinding shell (4) facing the bearing (101), a steering shaft is arranged on the side wall of the expansion frame (3), the steering shaft is inserted into the inner ring of the bearing (101), and the steering shaft is connected to the output end of the torsion motor (102); A grinding liner (8) is rotatably arranged in the middle of the grinding shell (4); a wire groove (801) is arranged in a circular array on the outer wall of the grinding liner (8); an elastic strip (802) is movably installed inside the wire groove (801); the elastic strip (802) and the inner wall of the wire groove (801) are connected by a reset spring; the outer edge of the elastic strip (802) is fitted on the inner wall of the grinding shell (4); movable shafts (402) are arranged at the upper and lower ends of the grinding liner (8); sealing cover plates (401) are arranged at the upper and lower ports of the grinding shell (4); a through hole matching the movable shaft (402) is arranged in the middle of the sealing cover plate (401); the movable shaft (402) is connected to a conversion motor; and a stirring assembly is arranged below the base plate (1).

3. The preparation device of the method for preparing a dispersant for lithium ion battery positive electrode slurry according to claim 2, characterized in that: The conversion motor comprises a cantilever bridge (2) at the top of a base plate (1), an electric push rod (5) is arranged at the top of the cantilever bridge (2), a driving motor (501) is arranged on the output rod of the electric push rod (5), a docking shaft (502) is arranged at the output end of the driving motor (501), a square box (403) is arranged at the top of the movable shaft (402), and a docking channel matching the cross section of the docking shaft (502) is arranged on the inner side of the movable shaft (402).

4. The preparation device for the method for preparing a dispersant for lithium ion battery positive electrode slurry according to claim 3, characterized in that: The cross-sections of the docking channel and the docking shaft (502) are square, and the side length of the cross-section of the docking channel is greater than the side length of the cross-section of the docking shaft (502) by two millimeters.

5. The preparation device for the method for preparing a dispersant for lithium ion battery positive electrode slurry according to claim 3, characterized in that: The edges of the docking channel and the docking shaft (502) are both provided with arc chamfers, and the surfaces of the docking channel and the docking shaft (502) are coated with lubricating oil.

6. The preparation device for the method for preparing a dispersant for lithium ion battery positive electrode slurry according to claim 2, characterized in that: The stirring assembly comprises an extension platform (6) at the bottom of the base plate (1), a stirring box (7) is arranged at the bottom end of the extension platform (6), six rollers (704) are rotatably arranged on the inner side wall of the stirring box (7), the rollers (704) are connected by a torsion belt (702) winding around each other, the profile of the torsion belt (702) is L-shaped, one of the rollers (704) is installed on the output end of the stirring motor (703), a stirring blade assembly is arranged on the torsion belt (702), and a heating assembly is also arranged at the bottom end of the stirring box (7).

7. The preparation device for the method for preparing a dispersant for lithium ion battery positive electrode slurry according to claim 6, characterized in that: The stirring blade assembly comprises an insertion hole on the side wall of the torsion belt (702), the thickness of the torsion belt (702) is three millimeters, the diameter of the insertion hole is two millimeters, an insertion rod (705) is inserted into the insertion hole, and a torsion blade (706) is arranged at the outer end of the insertion rod (705).

8. The preparation device for the method for preparing a dispersant for lithium ion battery positive electrode slurry according to claim 6, characterized in that: The heating component comprises a heating platform (701) at the bottom of the stirring box (7); the heating platform (701) is a double-layer copper plate structure, and a heating wire is arranged in the middle of the double-layer copper plate.

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