Powder mixing device for dry-method electrode preparation
By designing a support structure and a hybrid structure, and combining a rotary drive and an ultrasonic generator, the problems of uneven mixing and adhesive adhesion in dry electrode fabrication were solved, achieving efficient electrode material mixing and inner wall protection.
Patent Information
- Application Number
- CN202520204219.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-10
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-02-10
AI Technical Summary
During the dry electrode preparation process, the electrode material is not mixed evenly with the binder and conductive agent, and the binder tends to adhere to the inner wall of the mixing device, leading to wear.
The powder mixing device, which employs a support structure and a mixing structure, includes a first rotating drive component, an inclined powder mixing hopper, an inner protective coating layer, and an ultrasonic generating system. By combining rotation and ultrasonic waves, it achieves forced shear mixing and high-frequency micro-vibration of powder particles, preventing adhesive adhesion.
This method achieves uniform mixing of electrode materials, reduces inner wall wear, and improves powder mixing efficiency and electrode sheet quality.
Smart Images
Figure CN223945505U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of electrode manufacturing equipment, in particular to a powder mixing device for dry-process electrode preparation. BACKGROUND
[0002] The dry-process electrode is a new type of electrode preparation technology. In the preparation process of the dry-process electrode, powder mixing is required, that is, electrode materials, binders and conductive agents are mixed by using a dry-process technology.
[0003] Since the density of the positive electrode raw material of the dry-process electrode is much higher than the density of the binder and the conductive agent, for example, the loose bulk density of the binder polytetrafluoroethylene resin powder is about 0.45 kg / L, the loose bulk density of the conductive agent carbon black (model: Timcal Super C65) is about 0.16 kg / L, and the tap density of the ternary positive electrode NCM811 polycrystalline powder is about 1.5 kg / L. Therefore, when the electrode materials are mixed by using a traditional mixing device, the light and heavy powders are not easy to be uniformly mixed. Under the action of gravity, the dry powders of the binder and the conductive agent are often distributed on the positive electrode raw material powder and are difficult to be mixed into the positive electrode raw material powder. Even if the mixing time is prolonged, the powders are also difficult to be uniformly distributed. In addition, since the binder is very sensitive to shear force, the binder is easy to adhere to the inner wall of the mixing device. At the same time, the positive electrode raw material powder usually has high hardness and is easy to cause the inner wall of the mixing device to be worn after a long time of contact. CONTENT
[0004] The application aims to provide a powder mixing device for dry-process electrode preparation, and aims to improve the problems of uneven powder mixing and binder adhesion in the related art.
[0005] The application provides a powder mixing device for dry-process electrode preparation, which comprises a support structure and further comprises a mixing structure arranged on the support structure. The mixing structure comprises an upper equipment box, a first mixing assembly arranged on the upper equipment box, the first mixing assembly comprising a first rotary driving member, a connecting seat arranged on the first rotary driving member, the connecting seat being provided with a connecting member, the connecting member being provided with a powder mixing barrel, the powder mixing barrel being arranged in an inclined manner, the inner wall of the powder mixing barrel being coated with a protective coating layer, and the powder mixing barrel being rotationally connected with a second mixing assembly.
[0006] Further, the connecting member has a containing cavity, the second mixing assembly comprises a second rotary driving member arranged in the containing cavity and a transmission shaft arranged on the second rotary driving member, the transmission shaft penetrating through the powder mixing barrel and being located in the powder mixing barrel, and the transmission shaft being provided with a plurality of mixing leaves in the circumferential direction thereof.
[0007] Further, the upper equipment box has an upper cavity and a rotating channel in communication with the upper cavity, the first rotating drive is located in the upper cavity, the connecting seat is embedded in the rotating channel and coaxially connected with the output end of the first rotating drive.
[0008] Further, the connecting piece is fixedly connected to the connecting seat away from the first rotating drive, and the connecting piece is obliquely arranged; the powder mixing barrel is arranged at one end of the connecting piece away from the connecting seat.
[0009] Further, the connecting seat comprises a rotating disc, and the connecting piece is arranged at an eccentric position of the rotating disc.
[0010] Further, a fixing seat is arranged in the upper cavity, and the first rotating drive is arranged in the fixing seat; a maintenance back plate is arranged on one side of the upper equipment box relative to the rotating channel.
[0011] Further, the ultrasonic structure comprises an ultrasonic generator arranged in the supporting structure and a plurality of transducers arranged in the mixing structure, and the transducers are electrically connected with the ultrasonic generator.
[0012] Further, a plurality of the transducers are arranged on the outer wall of the powder mixing barrel, and the plurality of transducers are uniformly distributed along the circumferential direction of the powder mixing barrel.
[0013] The application has the following beneficial effects:
[0014] 1. The powder mixing device for dry electrode preparation can realize gravity diffusion type mixing by arranging the supporting structure and the mixing structure, and the first rotating drive drives the connecting seat and the connecting piece to rotate when the powder mixing device is running, the rotating connecting seat and the connecting piece drive the powder mixing barrel to rotate as a whole, so that the obliquely arranged powder mixing barrel is flipped up and down, at the same time, the second mixing assembly in the powder mixing barrel rotates independently relative to the powder mixing barrel, so that the material is subjected to forced shear type mixing, the mixing effect is guaranteed, the protective coating layer on the inner wall of the powder mixing barrel can effectively prevent the adhesive from adhering to the inner wall of the powder mixing barrel and reduce the abrasion of the raw material to the inner wall, so that all the materials participate in the mixing, the mixing effect is guaranteed, and the quality of the dry electrode plate is improved.
[0015] 2. The powder mixing device for dry electrode preparation can further prevent the adhesive from adhering to the wall by arranging the ultrasonic wave generating system outside the powder mixing barrel and utilizing the cavitation effect of ultrasonic waves to generate strong shock waves and micro jets, so that the powder mixing barrel and the powder particles in the barrel are subjected to high-frequency micro vibration, which helps to eliminate the powder agglomeration and facilitates the falling of the material adhered to the inner wall of the mixing barrel, thereby improving the powder mixing efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 is a structural schematic diagram of a powder mixing device for dry electrode preparation provided by an embodiment of the present application;
[0017] Figure 2 is a cross-sectional schematic diagram of a powder mixing device for dry electrode preparation provided by an embodiment of the present application;
[0018] Figure 3 is a schematic diagram of the internal structure of the upper equipment box in an embodiment of the present application;
[0019] Figure 4 is a schematic diagram of the structure of the first mixing assembly in an embodiment of the present application;
[0020] Figure 5 is another schematic diagram of the structure of the first mixing assembly in an embodiment of the present application;
[0021] Figure 6 is a schematic diagram of the structure of the second mixing assembly in an embodiment of the present application.
[0022] Legend:
[0023] 1, support structure; 11, lower equipment box; 2, mixing structure; 21, upper equipment box; 211, rotating passage; 212, fixed seat; 213, maintenance backplate; 22, first mixing assembly; 221, first rotary drive; 222, connecting seat; 223, connecting piece; 224, powder mixing barrel; 2241, protective coating layer; 2242, barrel cover; 23, second mixing assembly; 231, second rotary drive; 232, transmission shaft; 2321, mixing blade; 3, ultrasonic structure; 31, ultrasonic generator; 32, transducer. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.
[0025] It should be noted that although the functional modules are divided in the device schematic diagram, and the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than the module division in the device or the order in the flowchart. The terms "first", "second", etc. in the specification and claims and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.
[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.
[0027] With reference to Figure 1 , and Figure 2 , the embodiments of the present application provide a powder mixing device for dry electrode preparation, comprising a support structure 1, further comprising a mixing structure 2 arranged on the support structure 1, when the powder mixing device is running, the operator puts raw materials into the mixing structure 2, and the mixing structure 2 performs uniform stirring.
[0028] Specifically, the support structure 1 is used for supporting the mixing structure 2, and the support structure 1 comprises a lower equipment box 11. The mixing structure 2 comprises an upper equipment box 21 and a first mixing assembly 22 arranged on the upper equipment box 21. The upper equipment box 21 is installed above the lower equipment box 11, and under the support of the lower equipment box 11, the upper equipment box 21 has a certain height to facilitate the work of the first mixing assembly 22. The first mixing assembly 22 is used for mixing powder of raw materials, and the first mixing assembly 22 comprises a first rotary driving member 221 and a connecting seat 222 arranged on the first rotary driving member 221. The connecting seat 222 is provided with a connecting member 223, the connecting member 223 is provided with a powder mixing barrel 224, and the powder mixing barrel 224 is arranged in an inclined manner. The first rotary driving member 221 is a servo motor, under the driving of the first rotary driving member 221, the connecting seat 222 and the connecting member 223 rotate, thereby driving the powder mixing barrel 224 to rotate continuously. The continuously rotating powder mixing barrel 224 performs up-down overturning, thereby forcibly mixing the raw materials in the powder mixing barrel 224.
[0029] With reference to Figure 2 , Figure 3 , and Figure 4In order to adapt to the installation of the first mixing assembly 22, the upper equipment box 21 has an upper cavity and a rotating channel 211 in communication with the upper cavity. The first rotating drive 221 is located in the upper cavity, and a fixing seat 212 is arranged in the upper cavity, and the first rotating drive 221 is arranged on the fixing seat 212. The connecting seat 222 is fitted in the rotating channel 211 and is coaxially connected with the output end of the first rotating drive 221. In this embodiment, the connecting seat 222 includes a rotating disc in the shape of a pie, which is mounted on the rotating channel 211 and is in rotating connection with the rotating channel 211. The connecting piece 223 is a tubular part, which is fixedly connected to one side of the connecting seat 222 away from the first rotating drive 221, and is arranged in an inclined manner. The connecting piece 223 is arranged at an eccentric position of the rotating disc. The mixing barrel 224 is arranged at one end of the connecting piece 223 away from the connecting seat 222, and when the connecting seat 222 rotates, the mixing barrel 224 will be driven to rotate eccentrically by the connecting piece 223, so that the mixing barrel 224 rotates around its own axis while revolving around the axis of the connecting seat 222, so as to further drive the raw materials to mix. The upper equipment box 21 is also provided with an inspection back plate 213 on one side relative to the rotating channel 211, and the inspection back plate 213 can realize the protection, adjustment and repair of the first mixing assembly 22.
[0030] With reference to Figure 5 In order to avoid damage to the inner wall of the mixing barrel 224 by high-hardness raw materials, and to avoid the adhesion of the adhesive to the inner wall of the mixing barrel 224, the inner wall of the mixing barrel 224 is coated with a protective coating layer 2241. In this embodiment, the protective coating layer 2241 is a Teflon coating. By using the non-stick, wear-resistant and corrosion-resistant advantages of Teflon coating, the adhesion of the adhesive and the damage of the high-hardness raw materials to the inner wall can be effectively avoided. It can be understood that the protective coating layer 2241 can also be formed by other materials with non-stick and wear-resistant properties, which can be selected according to actual needs. A barrel cover 2242 is fitted and mounted at one end of the mixing barrel 224 away from the connecting piece 223 to close the mixing barrel 224.
[0031] With reference to Figure 5 and Figure 6In order to further improve the mixing uniformity, the second mixing assembly 23 is rotatably connected in the powder mixing barrel 224. The connecting piece 223 has a containing cavity, the second mixing assembly 23 comprises a second rotary driving piece 231 arranged in the containing cavity and a transmission shaft 232 arranged on the second rotary driving piece 231, the second rotary driving piece 231 is a servo motor, the second rotary driving piece 231 is coaxially connected with the transmission shaft 232, the transmission shaft 232 penetrates through the powder mixing barrel 224 and is located in the powder mixing barrel 224, and a plurality of mixing blades 2321 are arranged on the transmission shaft 232 in the circumferential direction. Under the driving of the second rotary driving piece 231, the transmission shaft 232 continuously rotates to drive the plurality of mixing blades 2321 to independently rotate relative to the powder mixing barrel 224, and the gravity diffusion type mixing is realized in cooperation with the rotating powder mixing barrel 224, so that the forced shear type mixing of the material is realized, and the mixing effect is ensured.
[0032] Looking back Figure 1 , Figure 2 and Figure 5 In addition, the powder mixing device further comprises an ultrasonic structure 3, the ultrasonic structure 3 comprises an ultrasonic generator 31 arranged on the support structure 1 and a plurality of transducers 32 arranged on the mixing structure 2, and the transducers 32 are electrically connected with the ultrasonic generator 31. The ultrasonic generator 31 is installed on the lower equipment box 11, the plurality of transducers 32 are arranged on the outer wall of the powder mixing barrel 224, and the plurality of transducers 32 are uniformly distributed along the circumferential direction of the powder mixing barrel 224. In this embodiment, the transducers 32 are four, and the four transducers 32 are distributed at intervals of 90° along the outer wall of the powder mixing barrel 224. By arranging the ultrasonic structure 3, the cavitation of ultrasonic waves generates strong shock waves and micro-jets, so that the powder mixing barrel 224 and the powder particles in the barrel are subjected to high-frequency micro-vibration, which helps to eliminate the powder agglomeration, facilitates the falling of the material adhered to the inner wall of the mixing barrel, prevents the adhesive from adhering to the wall, and further improves the powder mixing efficiency.
[0033] The working principle of the powder mixing device is as follows: the powder is put into the powder mixing barrel 224, the external power source is connected, the first rotary driving piece 221 drives the connecting seat 222 and the connecting piece 223 to rotate, so that the powder mixing barrel 224 rotates with the connecting seat 222 and the connecting piece 223, and the second rotary driving piece 231 drives the transmission shaft 232 to rotate to stir and mix the dry powder. While the powder mixing barrel 224 rotates, the transmission shaft 232 in the powder mixing barrel 224 independently rotates to realize the gravity diffusion type mixing and the forced shear type mixing of the powder, and the multiple motion mixing modes cooperate to greatly improve the mixing efficiency and make the powder mixing more fine and uniform. The protective coating layer 2241 coated on the inside of the powder mixing barrel 224 can prevent the powder raw material from adhering to the wall and reduce the abrasion of the powder mixing barrel 224 by the high-hardness raw material powder.
[0034] During the mixing process, the ultrasonic generator 31 sends out an electric signal, which is converted into ultrasonic waves by the transducer 32. The cavitation of the ultrasonic waves can generate strong shock waves and micro-jets, which can cause high-frequency micro-vibration of the mixing barrel 224 and the powder particles in the barrel, help to eliminate the powder caking, make the materials adhered to the inner wall of the mixing barrel fall off, prevent the adhesive from sticking to the wall, and further improve the powder mixing efficiency.
[0035] The exemplary embodiments of this disclosure are specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structure, arrangement or implementation method described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent arrangements within the spirit and scope of the appended claims.
Claims
1. A powder mixing device for dry electrode preparation comprising a support structure (1), characterized in that, Also include the mixing structure (2) arranged in the support structure (1), the mixing structure (2) includes the upper equipment box (21), the first mixing assembly (22) arranged in the upper equipment box (21), the first mixing assembly (22) includes the first rotating drive (221), the connecting seat (222) arranged in the first rotating drive (221), the connecting seat (222) is provided with connecting piece (223), the connecting piece (223) is provided with the mixing barrel (224), the mixing barrel (224) is arranged obliquely, the inner wall of the mixing barrel (224) is coated with a protective coating layer (2241), the mixing barrel (224) is rotatably connected with the second mixing assembly (23).
2. A powder mixing device for dry electrode preparation according to claim 1, characterized in that, The connecting piece (223) has a containing cavity, the second mixing assembly (23) includes a second rotating drive (231) arranged in the containing cavity and a transmission shaft (232) arranged on the second rotating drive (231), the transmission shaft (232) penetrates the mixing barrel (224) and is located in the mixing barrel (224), and the transmission shaft (232) is provided with a plurality of mixing leaves (2321) along the circumferential direction thereof.
3. A powder mixing device for dry electrode preparation according to claim 1, characterized in that, The upper equipment box (21) has an upper cavity and a rotating channel (211) in communication with the upper cavity, the first rotating drive (221) is located in the upper cavity, and the connecting seat (222) is embedded in the rotating channel (211) and coaxially connected with the output end of the first rotating drive (221).
4. A powder mixing device for dry electrode preparation according to claim 3, characterized in that, The connecting piece (223) is fixedly connected to the side of the connecting seat (222) away from the first rotating drive (221), and the connecting piece (223) is arranged obliquely; the mixing barrel (224) is arranged at the end of the connecting piece (223) away from the connecting seat (222).
5. A powder mixing device for dry electrode preparation according to claim 4, characterized in that, The connecting seat (222) includes a rotating disc, and the connecting piece (223) is arranged at the eccentric position of the rotating disc.
6. A powder mixing device for dry electrode preparation according to claim 3, characterized in that, The upper cavity is provided with a fixing seat (212), and the first rotating drive (221) is arranged in the fixing seat (212); the upper equipment box (21) is provided with an inspection back plate (213) on the side opposite to the rotating channel (211).
7. A powder mixing device for dry electrode preparation according to any one of claims 1-6, characterized in that, Also include the ultrasonic structure (3), the ultrasonic structure (3) includes the ultrasonic wave generator (31) arranged in the support structure (1) and a plurality of transducers (32) arranged in the mixing structure (2), and the transducers (32) are electrically connected with the ultrasonic wave generator (31).
8. A powder mixing device for dry electrode preparation according to claim 7, characterized in that, A plurality of transducers (32) are arranged on the outer wall of the mixing barrel (224), and a plurality of transducers (32) are uniformly distributed along the circumferential direction of the mixing barrel (224).