Coating equipment for lithium battery processing

Abstract

The utility model relates to the technical field of battery processing, in particular to coating equipment for lithium battery processing, which comprises a rack, a feeding box and a stirring box are arranged at the top of the rack, and the feeding end of the stirring box is connected with the discharging end of the feeding box; at least two material uniformizing modules are arranged in the feeding box, each material uniformizing module comprises at least two rotating shafts which are parallel to each other, the rotating shafts located in the same material uniformizing module can synergistically stir and convey materials towards one axial side of the material uniformizing module in a spiral mode, and the material conveying directions of the adjacent material uniformizing modules are opposite; a stirring shaft is arranged in the stirring box, a second spiral blade is arranged on the outer side of the stirring shaft, and the second spiral blade can stir materials close to the inner wall area of the stirring box to the radial center area of the stirring box after rotating around the stirring shaft. The utility model is favorable for solving the problems that the feeding and stirring structures of coating equipment adopted in the processing of silicon-carbon negative electrodes of some lithium batteries at present are simple, feeding materials are easy to stack and are not uniformly distributed, and the stirring efficiency and the stirring quality are further influenced.

Description

Technical Field

[0001] This utility model relates to the field of battery processing technology, and in particular to a coating device for lithium battery processing. Background Technology

[0002] Currently, silicon-carbon composite materials can be used as anode materials for lithium-ion batteries. Silicon-carbon anode materials are generally produced by carbon coating. Carbon coating can constrain and buffer the volume expansion of silicon, prevent the aggregation of nano-active particles, prevent the penetration of electrolyte phase center and maintain a stable cross-section. With the promotion of new energy vehicles, the demand for silicon-carbon anode materials is also increasing.

[0003] In existing technologies, the production of the aforementioned anode materials typically involves mixing graphite and silicon (silicon suboxide) in a mixing device to complete the coating process, followed by long-term carbonization in a low-temperature kiln. This method involves complex equipment and high process costs. Chinese Patent CN107224955A discloses a carbon coating device for lithium battery silicon-carbon anode materials, comprising: a barrel body with a lid; a discharge port and an air inlet at the bottom of the barrel body, a feeding port and an exhaust port on the lid, a tail gas collection tank connected to the exhaust port, and a cleaning device for cleaning accumulated material at the exhaust port; a rotatable main shaft at the axis of the barrel body, with multiple horizontally arranged stirring rods fixedly connected from bottom to top on the main shaft inside the barrel body, with adjacent stirring rods staggered at 5-90°; first blades fixedly connected to both ends of the lower to third layer of stirring rods to flip the material inside the barrel upwards along the inner wall of the barrel, and second blades fixedly connected to both ends of the upper two layers of stirring rods to press the flipped material down to the bottom of the barrel.

[0004] However, in the above technical solution, the stirring is only achieved by the main shaft inside the barrel driving the stirring rod and blades. When feeding, graphite and silicon directly enter the inside of the barrel. Since no pretreatment is performed, the two materials will clump together in the initial state and be unevenly distributed, which will have a direct negative impact on the stirring efficiency and stirring quality. Utility Model Content

[0005] This invention provides a coating device for lithium battery processing, which helps to solve the problem that the current coating devices used in the processing of silicon-carbon anodes of lithium batteries have simple feeding and stirring structures, which easily lead to the feeding materials piling up and uneven distribution, thus affecting the stirring efficiency and stirring quality.

[0006] This utility model is implemented as follows:

[0007] A coating device for lithium battery processing includes a frame, with a feeding box and a mixing box at the top of the frame. The feeding end of the feeding box is located at the top, and the discharging end of the mixing box is located at the bottom. The feeding end of the mixing box is connected to the discharging end of the feeding box. The feeding box contains at least two parallel and spaced-apart leveling modules. Each leveling module includes at least two parallel rotating shafts on the same horizontal plane. The outer surface of the rotating shafts is provided with first spiral blades. The rotating shafts in the same leveling module can work together to spirally agitate and convey materials in one axial direction. The material conveying directions of adjacent leveling modules are opposite. The mixing box contains a mixing module, which includes a horizontally arranged mixing shaft. An extension frame is provided on the outside of the mixing shaft, and a second spiral blade is provided on the outer periphery of the extension frame. After the second spiral blades rotate around the mixing shaft, they can agitate the materials near the inner wall area of ​​the mixing box to the radial center area of ​​the mixing box.

[0008] Based on the above technical solution, the top of the feeding box is provided with a first feeding port, the bottom of the feeding box is provided with a first discharging port, the top of the mixing box is provided with a second feeding port connected to the first discharging port, and the bottom of the mixing box is provided with a second discharging port; the second feeding port is connected to the bottom of the first discharging port, and an opening and closing control structure is provided at the connection between the two.

[0009] Based on the above technical solution, the mixing tank is equipped with a heating module.

[0010] Based on the above technical solution, the two axial ends of the rotating shaft are connected to the side wall of the feed box through bearings, and one axial side of the rotating shaft extends to the outside of the feed box and is connected to the first rotary drive component.

[0011] Based on the above technical solution, the first rotary drive component includes a motor, a reducer and a synchronization box, and the rotating shafts located in the same material leveling module form a synchronous transmission structure through the synchronization box.

[0012] Based on the above technical solution, a material feeding plate is also provided on the outer side wall of the rotating shaft.

[0013] Based on the above technical solution, a tamping flange is provided on the side wall of the first spiral blade.

[0014] Based on the above technical solution, the top of the mixing tank is provided with several air pipe interfaces for connecting to external air lines.

[0015] Based on the above technical solution, a scraper is provided on the outer periphery of the second spiral blade, and the outer end of the scraper is movably attached to the inner wall of the mixing tank.

[0016] Based on the above technical solution, the stirring shaft has a hollow structure with a heat conduction channel inside for circulating heat conduction medium, and the heat conduction channel is connected to an external temperature control mechanism.

[0017] Compared with the prior art, the present invention has at least the following advantages:

[0018] This utility model provides a coating equipment for lithium battery processing. By optimizing the material feeding and stirring structure, a feeding box is set at the front end of the stirring tank. Multiple cooperating homogenizing modules within the feeding box directionally and repeatedly circulate and stir the material at the feeding end. This achieves both initial mixing of graphite and silicon (or silicon suboxide) and ensures stable, quantitative material delivery, allowing it to enter the stirring tank uniformly and quantitatively. Subsequently, the rotation of the second helical blades within the stirring tank further stirs and mixes the material, improving stirring efficiency and quality, thereby enhancing the coating effect and providing strong support for the preparation of high-performance silicon-carbon anode materials. Furthermore, this equipment also boasts advantages such as simple structure, convenient operation, and low maintenance costs, making it suitable for large-scale industrial production. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a simplified structural diagram of a coating device for lithium battery processing in one embodiment;

[0021] Figure 2 for Figure 1 A partial structural diagram of the feed hopper;

[0022] Figure 3 for Figure 2 A schematic diagram of the structure of the first uniform material module;

[0023] Figure 4 This is a schematic diagram of the material movement path when the first and second material leveling modules are working.

[0024] Figure 5 This is a schematic diagram of the structure of the tamping flange in one embodiment;

[0025] Figure 6 for Figure 1 Schematic diagram of the internal structure of the mixing tank;

[0026] Figure 7 for Figure 6 Schematic diagram of the structure of the mixing module;

[0027] Figure 8 This is a schematic diagram of the scraper structure in another embodiment.

[0028] The diagram is labeled as follows: 100, Feed box; 101, First feed inlet; 102, First discharge outlet; 103, Conical hopper; 110, First material leveling module; 111, First motor; 112, Reducer; 113, Synchronizer; 114, First rotating shaft; 115, Second rotating shaft; 116, First spiral blade; 117, Material feeding plate; 118, Material tamping flange; 120, Second material leveling module; 200, Mixing box; 201, Second feed inlet; 202, Second discharge outlet; 203, Air pipe interface; 210, Mixing module; 211, Second motor; 212, Mixing shaft; 213, Extension frame; 214, Second spiral blade; 215, Scraper; 300, Frame. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model.

[0030] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0033] Example 1: Combination Figures 1 to 4 ,as well as Figure 6 and Figure 7This embodiment discloses a coating device for lithium battery processing, which aims to achieve uniform mixing of graphite and silicon (or silicon suboxide) by optimizing the material feeding and stirring structure, thereby improving stirring efficiency and quality and providing strong support for the preparation of high-performance silicon-carbon anode materials.

[0034] The coating equipment in this embodiment specifically includes a frame 300, which serves as a load-bearing support structure and is made of aluminum alloy profiles. The top of the frame 300 is equipped with a feed box 100 and a mixing box 200. The feed end of the feed box 100 is located at its top, facilitating the addition of raw materials into the equipment in conjunction with an external feeding mechanism. The discharge end of the mixing box 200 is located at its bottom, facilitating the discharge of the processed material. The feed end of the mixing box 200 is connected to the discharge end of the feed box 100, ensuring that the material smoothly enters the mixing box 200 from the feed box 100 for further processing.

[0035] To ensure a smoother flow of materials into the feed hopper 100 and to facilitate better material collection after discharge, the top of the feed hopper 100 is equipped with a cone-shaped hopper 103 that is wider at the top and narrower at the bottom.

[0036] Furthermore, the top of the feeding box 100 is provided with a first feeding port 101 for receiving raw materials; the bottom of the feeding box 100 is provided with a first discharging port 102; the top of the mixing box 200 is provided with a second feeding port 201 connected to the first discharging port 102; the bottom of the mixing box 200 is provided with a second discharging port 202; the second discharging port 202 is provided with a valve switch; the second feeding port 201 is connected to the bottom of the first discharging port 102 to ensure smooth material transfer, and the connection between the second feeding port 201 and the first discharging port 102 is provided with an opening and closing control structure (not shown in the figure), such as a solenoid valve or a manual valve, to control the flow of materials, so as to facilitate the control of the material agitation cycle in the feeding box 100, and also to avoid material leakage or blockage.

[0037] The feeding box 100 contains at least two parallel and spaced-apart leveling modules. Each leveling module includes at least two parallel rotating shafts on the same horizontal plane. The outer surface of each rotating shaft is provided with a first helical blade 116. The rotating shafts within the same leveling module can collaboratively agitate and convey material along their axial direction. The material conveying directions of adjacent leveling modules are opposite. In this embodiment, there are two leveling modules: a first leveling module 110 and a second leveling module 120, arranged vertically. The rotating shafts in the first leveling module 110 and the second leveling module 120 are horizontally oriented left and right. The rotation directions of the rotating shafts in the first leveling module 110 and the second leveling module 120, i.e., the orientation of the first helical blade 116, are opposite. The axial ends of each rotating shaft are connected to the side wall of the feeding box 100 via bearings. One axial side of the rotating shaft extends to the outside of the feeding box 100 and is connected to a first rotary drive component. Taking the first leveling module 110 as an example... Figure 3As shown, the first rotary drive component includes a first motor 111, a reducer 112, and a synchronization box 113 connected in sequence. The rotating shafts located in the same material leveling module form a synchronous transmission structure through the synchronization box 113. The rotating shafts in the first material leveling module 110 include a first rotating shaft 114 and a second rotating shaft 115 distributed front and rear. The first spiral blades 116 on the first rotating shaft 114 and the second rotating shaft 115 rotate in opposite directions. The first rotating shaft 114 and the second rotating shaft 115 can achieve synchronous reverse rotation through the power transmission of the synchronization box 113. Taking the side of the first motor 111 as an example, the first rotating shaft 114 rotates counterclockwise around its axial center line, and the second rotating shaft 115 rotates clockwise around its axial center line. When rotating synchronously, the first rotating shaft 114 can move the material located in its front area to the area between the two rotating shafts, and the second rotating shaft 115 can move the material located in its rear area to the area between the two rotating shafts. At the same time, the first rotating shaft 114 and the second rotating shaft 115 can gradually move the material in the right area to the left area (i.e., towards the side of the first motor 111). In this process, the material that has just entered the feed box 100 can be initially stirred and transported in an orderly and controlled manner. Furthermore, the second material leveling module 120 located below can reverse the agitation and convey the material, and the overall material movement path is as follows: Figure 4 As shown. If the connection between the first discharge port 102 and the second inlet port 201 is controlled by opening and closing, the material in the feed box 100 can form a repeated cycle of stirring, and the working state can be selected according to actual needs; if the connection between the first discharge port 102 and the second inlet port 201 is in the open state, the material in the feed box 100 will fall steadily into the mixing box 200 after initial stirring.

[0038] It should be noted that, in order to further enhance the mixing effect of materials, such as Figure 4 As shown, a material-pushing plate 117 can be provided on the outer wall of the rotating shaft to push the material when the rotating shaft rotates, thereby increasing the fluidity and mixing uniformity of the material.

[0039] Combination Figure 6 and Figure 7 The mixing tank 200 is equipped with a mixing module 210, which includes a horizontally arranged mixing shaft 212. Both ends of the mixing shaft 212 are connected to the side wall of the mixing tank 200 through bearings. A second motor 211 is connected to the outside of the mixing tank 200 on one axial side. The second motor 211 is a reduction motor that can control the mixing shaft 212 to rotate at a threshold speed.

[0040] Furthermore, an extension frame 213 is provided on the outer side of the stirring shaft 212. The extension frame is composed of several rods. A second spiral blade 214 is provided on the outer periphery of the extension frame 213. After the second spiral blade 214 rotates around the stirring shaft 212, it can stir the material near the inner wall area of ​​the mixing box 200 to the radial center area of ​​the mixing box 200, thereby playing the role of stirring the material and realizing the all-round mixing of the material, further improving the mixing quality.

[0041] Furthermore, the top of the mixing tank 200 is provided with several gas pipe interfaces 203 for connecting to external gas lines, such as inert gas or protective gas supply systems, to provide the required gas atmosphere during the mixing process and protect the materials from oxidation or contamination.

[0042] Furthermore, in this embodiment, the mixing tank 200 is equipped with a heating module to improve the reaction efficiency of the materials and the quality of the product. Specifically, the stirring shaft 212 has a hollow structure with a heat-conducting channel inside for the circulation of heat-conducting medium. The heat-conducting channel is connected to an external temperature control mechanism, such as a temperature controller or heater. By adjusting the temperature and flow rate of the heat-conducting medium, the temperature inside the mixing tank 200 is controlled, achieving precise control of the material reaction process. In other embodiments, the mixing tank 200 may also be equipped with heating wires, heating plates, or heating tubes, etc., to heat the materials inside the mixing tank 200 through the heating module, promoting the carbon coating reaction. Correspondingly, an insulation structure may also be configured on the outside of the mixing tank 200 to further effectively maintain and control the internal temperature.

[0043] In the specific implementation process, graphite and silicon (or silicon suboxide) raw materials enter the feed box 100 through the first feed port 101. After preliminary stirring and directional conveying, they are stably introduced into the mixing box 200 below. The mixing is carried out in all directions by the rotation of the stirring shaft 212 and the second spiral blade 214 to achieve high-quality stirring and improve the material coating effect. Then, they are output through the second discharge port 202.

[0044] Example 2: Based on Example 1, combined with Figure 5 As shown, a tamping flange 118 can be provided on the side wall of the first spiral blade 116, which is used to crush and disperse the material to a certain extent while stirring the material, which helps to break up the material agglomeration and improve the mixing quality.

[0045] Example 3: Based on Example 1, combined with Figure 8 As shown, in order to avoid material deposition and clumping on the inner wall of the mixing tank 200, a scraper 215 is provided on the outer periphery of the second spiral blade 214. The outer end of the scraper 215 is movably attached to the inner wall of the mixing tank 200. As the second spiral blade 214 rotates, it scrapes off the material adhering to the inner wall of the mixing tank 200, ensuring that the material is fully mixed.

[0046] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A coating device for lithium battery processing, characterized in that, Includes a frame (300), with a feed box (100) and a mixing box (200) on the top of the frame (300). The feed end of the feed box (100) is located at its top, and the discharge end of the mixing box (200) is located at its bottom. The feed end of the mixing box (200) is connected to the discharge end of the feed box (100). The feed box (100) is provided with at least two parallel and spaced material leveling modules. Each material leveling module includes at least two rotating shafts that are parallel to each other on the same horizontal plane. The outer surface of the rotating shafts is provided with first spiral blades (116). The rotating shafts in the same material leveling module can work together to spirally stir and transport materials to one side of their axial direction. The material transport directions of adjacent material leveling modules are opposite. The mixing tank (200) is equipped with a mixing module (210), which includes a horizontally arranged mixing shaft (212). An extension frame (213) is provided on the outside of the mixing shaft (212). A second spiral blade (214) is provided on the outer periphery of the extension frame (213). After the second spiral blade (214) rotates around the mixing shaft (212), it can stir the material near the inner wall area of ​​the mixing tank (200) to the radial center area of ​​the mixing tank (200).

2. The coating equipment for lithium battery processing according to claim 1, characterized in that, The feed box (100) has a first feed inlet (101) at the top and a first discharge outlet (102) at the bottom. The mixing box (200) has a second feed inlet (201) at the top connected to the first discharge outlet (102) and a second discharge outlet (202) at the bottom. The second feed inlet (201) is connected to the bottom of the first discharge outlet (102), and an opening and closing control structure is provided at the connection between the two.

3. The coating equipment for lithium battery processing according to claim 1, characterized in that, The mixing tank (200) is equipped with a heating module.

4. The coating equipment for lithium battery processing according to claim 1, characterized in that, The two ends of the rotating shaft are connected to the side wall of the feed box (100) through bearings, and one side of the rotating shaft extends to the outside of the feed box (100) and is connected to the first rotating drive component.

5. The coating equipment for lithium battery processing according to claim 4, characterized in that, The first rotary drive component includes a motor, a reducer (112), and a synchronization box (113). The rotating shafts located in the same material leveling module form a synchronous transmission structure through the synchronization box (113).

6. The coating equipment for lithium battery processing according to claim 1, characterized in that, The outer wall of the rotating shaft is also provided with a material feeding plate (117).

7. The coating equipment for lithium battery processing according to claim 1, characterized in that, The first helical blade (116) has a tamping flange (118) on its side wall.

8. The coating equipment for lithium battery processing according to claim 1, characterized in that, The mixing tank (200) is provided with several air pipe interfaces (203) on the top for connecting to external air lines.

9. The coating equipment for lithium battery processing according to claim 1, characterized in that, The second spiral blade (214) is provided with a scraper (215) on its outer periphery, and the outer end of the scraper (215) is movably attached to the inner wall of the mixing tank (200).

10. A coating device for lithium battery processing according to claim 3, characterized in that, The stirring shaft (212) has a hollow structure and a heat conduction channel for circulating heat conduction medium inside. The heat conduction channel is connected to an external temperature control mechanism.

Images