Porous graphite vacuum impregnation equipment

Abstract

The utility model provides porous graphite vacuum impregnation equipment, which comprises an impregnation tank, a liquid discharge switch mechanism, a stirring mechanism and a pressurizing mechanism, an impregnation cavity is arranged in the impregnation tank and is used for impregnating porous graphite with resin, and a liquid outlet communicated with the bottom of the impregnation cavity is arranged at the bottom of the impregnation tank; the liquid discharge switch mechanism is arranged at the bottom of the dipping cavity and is used for closing or opening the bottom of the dipping cavity; the stirring mechanism is arranged in the dipping cavity, and the stirring mechanism is used for stirring the porous graphite and the resin in the dipping cavity; the pressurizing mechanism is connected with the upper end of the dipping cavity and used for pressurizing the dipping cavity. According to the porous graphite vacuum impregnation equipment disclosed by the utility model, a mode of pressurizing while stirring is adopted, and after liquid is removed by pressurizing, resin on the surface of graphite can enter pores of the porous graphite more easily, so that the pores of the porous graphite are effectively filled with the resin.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery anode material production technology, and in particular to a porous graphite vacuum impregnation device. Background Technology

[0002] The existing artificial graphite production process produces some byproducts with low vibration, low compaction, and high specific surface area, such as resistive materials during graphitization and substandard products. This problem is usually caused by the high porosity of the graphite itself, and this type of graphite is generally called porous graphite.

[0003] These porous graphites are generally treated with carbon raisers, discarded, or simply processed and used as low-end negative electrode materials, but this reduces their value. Shaping is often used to improve their appearance, or carbonization coating processes are used to reduce their specific surface area, but these improvements are limited. The low compaction density, low vibration density, and high specific surface area of ​​porous graphite are mainly due to its numerous pores. Currently, some have proposed using vacuum impregnation to fill these pores; however, existing vacuum impregnation equipment has the following problems: ① Conventional equipment has many dead zones in the mixing of graphite and liquid additives, resulting in poor mixing and incomplete filling of graphite pores, leading to poor impregnation effects; ② Conventional equipment cannot effectively remove excess liquid additives after liquid impregnation, wasting liquid additives.

[0004] Therefore, it is necessary to provide a device that can improve the batch uniformity of graphite and liquid additives, and effectively remove excess impregnated additives after impregnation, thereby improving the pore filling effect and additive utilization rate. Utility Model Content

[0005] The purpose of this invention is to provide a porous graphite vacuum impregnation device that improves the uniformity of mixing graphite and liquid additives, and can effectively remove excess impregnation additives after impregnation, thereby improving the pore filling effect and the utilization rate of additives.

[0006] To achieve the above objectives, this utility model provides a porous graphite vacuum impregnation device, including an impregnation tank, a drain switch mechanism, a stirring mechanism, and a pressurizing mechanism. The impregnation tank contains an impregnation chamber for impregnating porous graphite with resin. The bottom of the impregnation tank has a liquid outlet communicating with the bottom of the impregnation chamber. The drain switch mechanism is located at the bottom of the impregnation chamber and is used to close or open the bottom of the impregnation chamber. The stirring mechanism is located within the impregnation chamber and is used to stir the porous graphite and resin within the impregnation chamber. The pressurizing mechanism is connected to the upper end of the impregnation chamber and is used to pressurize the impregnation chamber.

[0007] Preferably, the impregnation cavity has a conical structure.

[0008] Preferably, the porous graphite vacuum impregnation equipment further includes a filter element disposed at the bottom of the impregnation chamber and below the drain switch mechanism, the filter element being used to filter out excess resin.

[0009] Preferably, the filter element includes a first mesh layer, a filter cloth body, and a second mesh layer arranged sequentially from top to bottom.

[0010] Preferably, the stirring mechanism includes a stirring rotation drive module and a stirring element, the stirring element being disposed within the impregnation chamber, and the output end of the stirring rotation drive module being connected to the stirring element.

[0011] Preferably, the pressurizing mechanism includes a pressurizing system, a pressurizing pipeline, and a pressurizing control valve. The pressurizing pipeline is connected between the pressurizing system and the upper end of the impregnation chamber. The pressurizing system can pressurize the impregnation chamber through the pressurizing pipeline. The pressurizing control valve is disposed on the pressurizing pipeline and is used to control the opening and closing of the pressurizing pipeline.

[0012] Preferably, the porous graphite vacuum impregnation equipment further includes a liquid storage mechanism and a vacuum mechanism. The liquid storage mechanism is connected to the upper end of the impregnation chamber, and the liquid storage mechanism is used to store the resin. The vacuum mechanism is connected to the upper end of the impregnation chamber, and the vacuum mechanism is used to evacuate the impregnation chamber.

[0013] Preferably, the liquid storage mechanism includes a liquid storage tank, a liquid storage delivery pipeline, and a liquid storage delivery control valve. The liquid storage delivery pipeline is connected between the liquid storage tank and the upper end of the impregnation chamber. The liquid storage tank is used to store the resin. The liquid storage delivery control valve is disposed on the liquid storage delivery pipeline and is used to control the opening and closing of the liquid storage delivery pipeline.

[0014] Preferably, the vacuum mechanism includes a vacuum system, a vacuum pipe, and a vacuum control valve. The vacuum pipe is connected between the vacuum system and the upper end of the impregnation chamber. The vacuum system can evacuate the impregnation chamber through the vacuum pipe. The vacuum control valve is disposed on the vacuum pipe and is used to control the opening and closing of the vacuum pipe.

[0015] Preferably, the porous graphite vacuum impregnation equipment further includes a ventilation pipeline and a ventilation control valve. One end of the ventilation pipeline is connected to the upper end of the impregnation chamber, and the other end of the ventilation pipeline is connected to the external atmospheric pressure. The ventilation control valve is disposed on the ventilation pipeline and is used to control the opening and closing of the ventilation pipeline.

[0016] Compared with the prior art, the porous graphite vacuum impregnation equipment of this utility model is equipped with an impregnation tank, a drain switch mechanism, a stirring mechanism, and a pressurizing mechanism. After the porous graphite in the impregnation chamber of the impregnation tank is completely impregnated with resin, the impregnation chamber can be pressurized by the pressurizing mechanism, and the bottom of the impregnation chamber can be opened by the drain switch mechanism. Under pressurization, excess liquid resin is effectively discharged from the bottom of the impregnation chamber through the outlet of the impregnation tank. Then, the bottom of the impregnation chamber is closed by the drain switch mechanism. While maintaining constant pressure, the stirring mechanism stirs the mixture. At this time, due to the discharge of excess liquid resin, the high pressure acts directly on the liquid resin bonding the surface of the porous graphite, which is beneficial to the impregnation of the liquid resin and improves the uniformity of the mixing of graphite and liquid additives. Moreover, the stirring process can effectively increase the contact between the porous graphite and the gas surface, which is beneficial to accelerating the further impregnation of the liquid resin. Therefore, the porous graphite vacuum impregnation equipment of this invention adopts a method of stirring and pressurizing simultaneously. Under pressure, excess impregnation auxiliary materials are effectively discharged, making it easier for the resin on the graphite surface to enter the pores of the porous graphite, thereby improving the pore filling effect and auxiliary material utilization rate. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the porous graphite vacuum impregnation equipment of this utility model.

[0018] Figure 2 This is a structural diagram of the filter element in the porous graphite vacuum impregnation equipment of this utility model. Detailed Implementation

[0019] To explain the technical content and structural features of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0020] Please see Figure 1 The porous graphite vacuum impregnation device 100 of this utility model includes an impregnation tank 1, a drain switch mechanism 2, a stirring mechanism 3, and a pressurizing mechanism 4. The impregnation tank 1 is provided with an impregnation chamber 11 for impregnating porous graphite with resin. The bottom of the impregnation tank 1 is provided with an outlet 12 that communicates with the bottom of the impregnation chamber 11. The drain switch mechanism 2 is located at the bottom of the impregnation chamber 11 and is used to close or open the bottom of the impregnation chamber 11. The stirring mechanism 3 is located in the impregnation chamber 11 and is used to stir the porous graphite and resin located in the impregnation chamber 11. The pressurizing mechanism 4 is connected to the upper end of the impregnation chamber 11 and is used to pressurize the impregnation chamber 11.

[0021] After the porous graphite in the impregnation chamber 11 of the impregnation tank 1 is completely impregnated with resin, the impregnation chamber 11 can be pressurized by the pressurizing mechanism 4, and the bottom of the impregnation chamber 11 can be opened by the drain switch mechanism 2. Under pressurization, excess liquid resin is effectively discharged from the bottom of the impregnation chamber 11 through the outlet 12 of the impregnation tank 1. Then the bottom of the impregnation chamber 11 is closed by the drain switch mechanism 2. While maintaining constant pressure, the stirring mechanism 3 stirs the mixture. At this time, due to the discharge of excess liquid resin, the high pressure acts directly on the liquid resin bonding the surface of the porous graphite, which is beneficial to the impregnation of the liquid resin and improves the uniformity of the mixing of graphite and liquid additives. Moreover, the stirring process can effectively increase the contact between the porous graphite and the gas surface, which is beneficial to accelerating the further impregnation of the liquid resin.

[0022] Please see Figure 1 In one embodiment, the impregnation chamber 11 has a conical structure. Specifically, the impregnation tank 1 also has a conical structure. By setting the impregnation chamber 11 to a conical structure, the problem of multiple dead angles in a horizontal tank can be avoided when the stirring mechanism 3 is stirring. This allows more resin to come into contact with the high-pressure gas, which is beneficial for impregnation. Furthermore, the improved stirring uniformity allows the material to be heated more evenly during the heating process, ensuring the stability of the material during the preparation process. However, the shape and structure of the impregnation chamber 11 and the impregnation tank 1 are not limited to this.

[0023] Please see Figure 1 and Figure 2 In one embodiment, the porous graphite vacuum impregnation device 100 of this invention further includes a filter element 5. The filter element 5 is disposed at the bottom of the impregnation chamber 11 and located below the drain switch mechanism 2. The filter element 5 is used to filter excess resin. By setting the drain switch mechanism 2 and the filter element 5 at the bottom of the impregnation chamber 11, a double-intercepting discharge structure is formed. When removing excess resin (or impregnation liquid), the bottom of the impregnation chamber 11 is opened by the drain switch mechanism 2, so that the excess resin (or impregnation liquid) in the impregnation chamber 11 can be discharged downward through the drain switch mechanism 2. At the same time, the filter element 5 located below the drain switch mechanism 2 is locked, and the filter element 5 is used to filter the downwardly discharged resin again, while intercepting the porous graphite entrained in the resin. Specifically, the filter element 5 can be locked at the bottom of the impregnation chamber 11 by a locking member, so that the filter element 5 filters excess resin below the drain switch mechanism 2. After the porous graphite is processed, the bottom of the impregnation chamber 11 can be opened by the drain switch mechanism 2, and the filter cloth can be released by the locking element, so that the bottom of the impregnation chamber 11 is fully opened and the bottom of the impregnation chamber 11 is fully connected with the liquid outlet 12, so that the material discharge process can be carried out.

[0024] Furthermore, the filter element 5 includes a first mesh layer 51, a filter cloth body 52, and a second mesh layer 53 arranged sequentially from top to bottom. This structure ensures that the filter element 5 maintains a stable structure when the discharged liquid is subjected to high pressure, and allows the liquid to be discharged, while the porous graphite remains in the impregnation tank 1 for subsequent processing. The first mesh layer 51 and the second mesh layer 53 may be composed of fixed, relatively thick steel wires (the steel wires having a mesh structure), but are not limited to this.

[0025] Please see Figure 1 In one embodiment, the stirring mechanism 3 includes a stirring rotation drive module (not shown) and a stirring element 31. The stirring element 31 is disposed in the impregnation chamber 11, and the output end of the stirring rotation drive module is connected to the stirring element 31. The stirring rotation drive module may adopt an existing rotary motor structure, but is not limited thereto.

[0026] Please see Figure 1 In one embodiment, the pressurizing mechanism 4 includes a pressurizing system 41, a pressurizing pipe 42, and a pressurizing control valve 43. The pressurizing pipe 42 is connected between the pressurizing system 41 and the upper end of the impregnation chamber 11. The pressurizing system 41 can pressurize the impregnation chamber 11 through the pressurizing pipe 42. The pressurizing control valve 43 is disposed on the pressurizing pipe 42 and is used to control the opening and closing of the pressurizing pipe 42. When pressurization of the impregnation chamber 11 is required, the pressurizing pipe 42 can be opened through the pressurizing control valve 43, so that the pressurizing system 41 pressurizes the impregnation chamber 11 through the pressurizing pipe 42. When pressurization is not required, the pressurizing pipe 42 can be closed through the pressurizing control valve 43, so that the pressurizing system 41 stops pressurizing the impregnation chamber 11. The pressurizing control valve 43 can adopt existing structures such as solenoid valves and mechanical control valves; the specific structure and principle of the pressurizing system 41 are well known to those skilled in the art, and therefore will not be described in detail here.

[0027] Please see Figure 1 The porous graphite vacuum impregnation apparatus 100 of this invention also includes a liquid storage mechanism 6 and a vacuum mechanism 7. The liquid storage mechanism 6 is connected to the upper end of the impregnation chamber 11 and is used to store resin. The vacuum mechanism 7 is connected to the upper end of the impregnation chamber 11 and is used to evacuate the impregnation chamber 11. After the shaped porous graphite is placed into the impregnation chamber 11 of the impregnation tank 1, the impregnation chamber 11 can be evacuated by the vacuum mechanism 7, for example, by reducing the air pressure in the impregnation chamber 11 to -0.08 MPa, but not limited to this. Then, this air pressure is maintained for a period of time to ensure that the air in the pores of the porous graphite is discharged as much as possible. Next, the resin in the liquid storage mechanism 6 is injected into the impregnation chamber 11 under vacuum conditions. When the resin completely wets the porous graphite, the injection is stopped and maintained for a period of time to ensure that the resin enters the interior of the porous graphite pores as much as possible. Then, the resin and porous graphite in the impregnation chamber 11 are pressurized by the pressurization mechanism 4.

[0028] In one embodiment, the liquid storage mechanism 6 includes a liquid storage tank 61, a liquid storage delivery pipe 62, and a liquid storage delivery control valve 63. The liquid storage delivery pipe 62 is connected between the liquid storage tank 61 and the upper end of the impregnation chamber 11. The liquid storage tank 61 is used to store resin, and the liquid storage delivery control valve 63 is disposed on the liquid storage delivery pipe 62 and is used to control the opening and closing of the liquid storage delivery pipe 62. When it is necessary to inject resin into the impregnation chamber 11, the liquid storage delivery pipe 62 can be opened through the liquid storage delivery control valve 63. Under the negative pressure of the impregnation chamber 11, the resin in the liquid storage tank 61 is injected into the impregnation chamber 11 through the liquid storage delivery pipe 62. When it is not necessary to inject resin, the liquid storage delivery pipe 62 can be closed through the liquid storage delivery control valve 63 to stop the delivery of resin to the impregnation chamber 11. The liquid storage delivery control valve 63 can adopt existing structures such as solenoid valves and mechanical control valves.

[0029] In one embodiment, the vacuum mechanism 7 includes a vacuum system 71, a vacuum pipe 72, and a vacuum control valve 73. The vacuum pipe 72 is connected between the vacuum system 71 and the upper end of the impregnation chamber 11. The vacuum system 71 can evacuate the impregnation chamber 11 through the vacuum pipe 72. The vacuum control valve 73 is disposed on the vacuum pipe 72 and is used to control the opening and closing of the vacuum pipe 72. By opening the vacuum pipe 72 through the vacuum control valve 73, the vacuum system 71 evacuates the impregnation chamber 11 through the vacuum pipe 72, thereby creating a negative pressure in the impregnation chamber 11. When it is not necessary to evacuate the impregnation chamber 11, the vacuum pipe 72 can be closed through the vacuum control valve 73. The vacuum control valve 73 can adopt existing structures such as solenoid valves and mechanical control valves; the specific structure and principle of the vacuum system 71 are well known to those skilled in the art, and therefore will not be described in detail here.

[0030] Please see Figure 1 In one embodiment, the porous graphite vacuum impregnation equipment 100 of this invention further includes a ventilation pipe 8 and a ventilation control valve 81. One end of the ventilation pipe 8 is connected to the upper end of the impregnation chamber 11, and the other end of the ventilation pipe 8 is connected to the external atmospheric pressure. The ventilation control valve 81 is disposed on the ventilation pipe 8 and is used to control the opening and closing of the ventilation pipe 8. After the porous graphite processing is completed, the ventilation pipe 8 can be opened through the ventilation control valve 81, so that the impregnation chamber 11 is connected to the external atmospheric pressure through the ventilation pipe 8, making the internal air pressure of the impregnation chamber 11 the same as that of the outside, so as to facilitate material discharge and opening of the impregnation tank 1. The ventilation control valve 81 can adopt existing structures such as solenoid valves and mechanical control valves.

[0031] Combination Figure 1 and Figure 2 The specific working principle of the porous graphite vacuum impregnation equipment 100 of this utility model is as follows:

[0032] The shaped porous graphite is placed into the impregnation chamber 11 of the impregnation tank 1. The impregnation chamber 11 is evacuated using the vacuum mechanism 7, reducing the air pressure inside to -0.08 MPa. This pressure is maintained for a period of time to ensure that as much air as possible is expelled from the pores of the porous graphite. Next, under vacuum conditions, the resin in the liquid storage mechanism 6 is injected into the impregnation chamber 11. Once the resin has completely impregnated the porous graphite, the injection is stopped and maintained for a period of time to ensure that the resin penetrates as much as possible into the pores of the porous graphite. Then, the impregnation chamber 11 is pressurized by the pressurizing mechanism 4, and the bottom of the impregnation chamber 11 is opened by the drain switch mechanism 2. When the pressure reaches 5 MPa, the pressurization is stopped. Under pressurization, excess liquid resin is effectively discharged from the bottom of the impregnation chamber 11 through the outlet 12 of the impregnation tank 1. Then, the bottom of the impregnation chamber 11 is closed by the drain switch mechanism 2. While maintaining a constant pressure of 5 MPa, the stirring mechanism 3 stirs and maintains the mixture for a period of time. At this time, due to the discharge of excess liquid resin, the high pressure acts directly on the liquid resin bonding the porous graphite surface, which is beneficial to the impregnation of the liquid resin and improves the uniformity of the mixing of graphite and liquid additives. Moreover, the stirring process can effectively increase the contact between the porous graphite and the gas surface, which is beneficial to accelerate the further impregnation of the liquid resin. After stirring for a period of time, a high-temperature treatment is performed to mix the resin and porous graphite evenly while removing the volatile components of the resin, resulting in high-temperature treated porous graphite. The high-temperature treated porous graphite is then fed into a box furnace, where it is heated to 1150°C and held at that temperature to obtain carbonized porous graphite.

[0033] In summary, the porous graphite vacuum impregnation equipment 100 of this invention adopts a method of simultaneous stirring and pressurization. Under pressure, excess impregnation auxiliary materials are effectively discharged, making it easier for the resin on the graphite surface to enter the pores of the porous graphite, thereby improving the pore filling effect and auxiliary material utilization rate. Secondly, the impregnation chamber 11 of the impregnation tank 1 adopts a conical structure design, which avoids the problem of multiple dead corners in horizontal tanks when the stirring mechanism 3 is stirring. This allows more resin to come into contact with high-pressure gas, which is beneficial to the impregnation process. Furthermore, the improved stirring uniformity allows the material to be heated more evenly during the heating process, ensuring the stability of the material during the preparation process. In addition, the impregnation tank 1 of the porous graphite vacuum impregnation equipment 100 of this invention adopts a dual interception and discharge mode. When removing excess liquid resin, the upper drain switch mechanism 2 can be opened to lock the lower filter element 5, thereby ensuring that the porous graphite is intercepted in the impregnation chamber 11, while the excess liquid resin is discharged through the drain switch mechanism 2, the filter element 5, and the outlet 12. Furthermore, the filter element 5 of the porous graphite vacuum impregnation equipment 100 of this utility model adopts a three-layer structure. The upper and lower layers are composed of a fixed and relatively coarse mesh layer structure, and the middle layer is the filter cloth body 52. ​​This structure ensures that the filter element 5 can maintain a stable structure when the discharged liquid is subjected to a large pressure. At the same time, the liquid phase resin can be discharged, while the porous graphite remains in the impregnation chamber 11 for subsequent processing.

[0034] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall fall within the scope of the present utility model.

Claims

1. A porous graphite vacuum impregnation device, characterized in that, include: The impregnation tank, the drain switch mechanism, the stirring mechanism, and the pressurizing mechanism, among which, The impregnation tank is provided with an impregnation chamber for impregnating porous graphite with resin, and the bottom of the impregnation tank is provided with an outlet that communicates with the bottom of the impregnation chamber. The drain switch mechanism is located at the bottom of the impregnation chamber, and the drain switch mechanism is used to close or open the bottom of the impregnation chamber; The stirring mechanism is disposed in the impregnation chamber, and the stirring mechanism is used to stir the porous graphite and the resin located in the impregnation chamber; The pressurizing mechanism is connected to the upper end of the impregnation chamber, and the pressurizing mechanism is used to pressurize the impregnation chamber.

2. The porous graphite vacuum impregnation equipment according to claim 1, characterized in that, The impregnation cavity has a conical structure.

3. The porous graphite vacuum impregnation equipment according to claim 1, characterized in that, It also includes a filter element disposed at the bottom of the impregnation chamber and below the drain switch mechanism, the filter element being used to filter out excess resin.

4. The porous graphite vacuum impregnation equipment according to claim 3, characterized in that, The filter element includes a first mesh layer, a filter cloth body, and a second mesh layer arranged sequentially from top to bottom.

5. The porous graphite vacuum impregnation equipment according to claim 1, characterized in that, The stirring mechanism includes a stirring rotation drive module and a stirring component. The stirring component is disposed in the impregnation chamber, and the output end of the stirring rotation drive module is connected to the stirring component.

6. The porous graphite vacuum impregnation equipment according to claim 1, characterized in that, The pressurizing mechanism includes a pressurizing system, a pressurizing pipeline, and a pressurizing control valve. The pressurizing pipeline is connected between the pressurizing system and the upper end of the impregnation chamber. The pressurizing system can pressurize the impregnation chamber through the pressurizing pipeline. The pressurizing control valve is disposed on the pressurizing pipeline and is used to control the opening and closing of the pressurizing pipeline.

7. The porous graphite vacuum impregnation equipment according to claim 1, characterized in that, It also includes a liquid storage mechanism and a vacuum mechanism. The liquid storage mechanism is connected to the upper end of the impregnation chamber and is used to store the resin. The vacuum mechanism is connected to the upper end of the impregnation chamber and is used to evacuate the impregnation chamber.

8. The porous graphite vacuum impregnation equipment according to claim 7, characterized in that, The liquid storage mechanism includes a liquid storage tank, a liquid storage and delivery pipeline, and a liquid storage and delivery control valve. The liquid storage and delivery pipeline is connected between the liquid storage tank and the upper end of the impregnation chamber. The liquid storage tank is used to store the resin. The liquid storage and delivery control valve is installed on the liquid storage and delivery pipeline and is used to control the opening and closing of the liquid storage and delivery pipeline.

9. The porous graphite vacuum impregnation equipment according to claim 7, characterized in that, The vacuum mechanism includes a vacuum system, a vacuum pipe, and a vacuum control valve. The vacuum pipe is connected between the vacuum system and the upper end of the impregnation chamber. The vacuum system can evacuate the impregnation chamber through the vacuum pipe. The vacuum control valve is located on the vacuum pipe and is used to control the opening and closing of the vacuum pipe.

10. The porous graphite vacuum impregnation equipment according to claim 1, characterized in that, It also includes a ventilation pipeline and a ventilation control valve. One end of the ventilation pipeline is connected to the upper end of the impregnation chamber, and the other end of the ventilation pipeline is connected to the external atmospheric pressure. The ventilation control valve is installed on the ventilation pipeline and is used to control the opening and closing of the ventilation pipeline.

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