Sodium electric homogenate coating device and sodium electric homogenate coating method

Abstract

The invention relates to the technical field of devices or methods for surface coating, in particular to a sodium electric homogenate coating device and a sodium electric homogenate coating method. The invention provides a sodium ion homogenate coating device which comprises a powder raw material feeding bin and a liquid raw material feeding bin, the powder raw material feeding bin and the liquid raw material feeding bin convey powder raw materials and liquid raw materials into a powder storage tank and a liquid storage tank, the powder storage tank is connected with a dispersion tank, and the dispersion tank is connected with a sodium ion battery. Powder raw materials are conveyed into the dispersion tank from the powder storage tank in a vacuum manner; a powder raw material and a liquid raw material are respectively conveyed into the homogenizing tank from the dispersing tank and the liquid storage tank in a vacuum manner; the homogenizing tank is connected with a finished product tank, the finished product tank is connected with a transfer tank, the transfer tank is connected with a coating device, and the coating device is provided with an air filtering unit; a control system is further included. The method can effectively improve the moisture control of the slurry and the battery performance, overcomes the defects that the sodium ion battery in the prior art is easy to absorb water during homogenate coating and the like, and improves the battery performance and the production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of surface coating devices or methods, in particular to a sodium battery homogenate coating device and a sodium battery homogenate coating method. BACKGROUND

[0002] In the preparation process of sodium ion battery materials, it is easy to react with moisture, especially the sodium battery positive electrode material is easy to react with moisture, which leads to performance decline or even failure. The presence of water may cause oxidation of raw materials, decrease in slurry stability, coating defects, and even battery failure.

[0003] In the production process of sodium batteries, the homogenate coating link is a core step in the preparation of electrode materials, which directly affects the overall performance of the battery. The homogenate process fully mixes the active material, conductive agent and binder to form a uniform and stable slurry, and then uniformly coats the slurry on the foil.

[0004] In the existing traditional homogenate coating production process, the feeding method is usually carried out in an open environment, which is easy to introduce impurities such as oxygen and moisture in the air. These impurities will react with the electrode material, causing material structure damage and performance decline. Secondly, the existing homogenate equipment often has difficulty in achieving high-precision material ratio control, especially in the multi-component material mixing process, which is easy to cause ratio deviation, thereby affecting the consistency of the electrode material. In addition, the traditional homogenate and coating process is usually divided into two separate steps. This separation type production mode not only increases the complexity of the process flow, but also reduces the production efficiency, and may cause material pollution or waste in the transmission process. SUMMARY

[0005] In view of the fact that the existing homogenate and coating process is usually divided into two separate steps, this separation type production mode not only increases the complexity of the process flow, but also reduces the production efficiency, and may cause material pollution or waste in the transmission process, the present application provides a sodium battery homogenate coating device and a sodium battery homogenate coating method, which can effectively improve the moisture control of the slurry and the battery performance, solve the deficiencies in the production of sodium ion battery homogenate coating, such as water absorption, and improve the battery performance and production efficiency.

[0006] The present application provides a kind of sodium electric homogenate coating device, including powder raw material feeding bin and liquid raw material feeding bin, powder raw material feeding bin and liquid raw material feeding bin respectively powder raw material, liquid raw material in material storage chamber is transported to powder storage tank and liquid storage tank, powder storage tank is connected with dispersion tank, powder raw material is transported to dispersion tank from powder storage tank by vacuum;Dispersion tank, liquid storage tank are connected with homogenate tank, powder raw material, liquid raw material is respectively transported to homogenate tank from dispersion tank, liquid storage tank by vacuum;Homogenate tank is connected with finished product tank, finished product tank is connected with transfer tank, transfer tank is connected with coating device, coating device is provided with air filter unit;It further includes control system, control system controls and controls the on-off of the environmental humidity of material storage chamber, powder raw material feeding bin, liquid raw material feeding bin, powder storage tank, liquid storage tank, homogenate tank, finished product tank, transfer tank, homogenate chamber, coating chamber and material transport.

[0007] Further, air filter unit is provided with primary filter and secondary filter, primary filter is primary filter, and secondary filter is HEPA or ULPA high-efficiency filter.

[0008] Further, air filter unit adopts fan filter unit.

[0009] Further, the environmental humidity of material storage chamber, powder raw material feeding bin, liquid raw material feeding bin, powder storage tank, liquid storage tank, homogenate tank, finished product tank, transfer tank, homogenate chamber and coating chamber is controlled in the range of 0% ~ 10%RH.

[0010] Further, the homogenate tank is provided with an online viscometer for detecting the viscosity of the slurry in the homogenate tank, and the online viscometer is electrically connected with the control system.

[0011] The present application provides a kind of sodium electric homogenate coating method, including the following steps: S1, powder raw material is transported to powder storage tank from powder raw material feeding bin, and powder storage tank is provided with weighing module to monitor the mass of powder raw material in powder storage tank in real time;S2, powder raw material is transported into dispersion tank for premixing by vacuum from powder storage tank;S3, liquid raw material is transported to liquid storage tank from liquid raw material feeding bin, and liquid storage tank is provided with weighing module to monitor the mass of liquid raw material in liquid storage tank in real time;S4, powder raw material and liquid raw material are respectively transported to homogenate tank from dispersion tank and liquid storage tank by vacuum, and powder raw material and liquid raw material in homogenate tank are stirred;S5, the slurry after stirring is transported to finished product tank, and the slurry in finished product tank is transported to transfer tank, and the slurry in transfer tank is transported to coating equipment for coating, external air enters the interior of coating equipment after passing through air cleaning unit, and coating process is carried out by oven baking and dust removal, and slurry coating is completed.

[0012] Furthermore, the air purification unit includes a primary filter and a secondary filter. The primary filter is a pre-filter, and the secondary filter is a HEPA or ULPA high-efficiency filter.

[0013] Furthermore, the air cleaning unit cleans the air as follows: after the fan at the top or side of the air intake fan filter unit is started, a negative pressure effect is generated, drawing outside air into the coating equipment. The intake air first passes through a pre-filter to remove larger particles. The air that has passed through the pre-filter then enters a HEPA or ULPA high-efficiency filter to further remove fine particles, ensuring air cleanliness. The filtered clean air, under the positive pressure generated by the fan, is evenly delivered into the clean area through the air outlet, forming a stable clean air layer. The fan filter unit continuously circulates the air, maintaining the air quality in the clean area. The control system adjusts the fan speed and air volume to adapt to different cleanliness requirements.

[0014] Furthermore, the humidity of the material storage room, powder raw material feeding silo, liquid raw material feeding silo, powder storage tank, liquid storage tank, homogenizing tank, finished product tank, transfer tank, homogenizing room, and coating room is controlled within the range of 0% to 10%RH.

[0015] Furthermore, the on / off state of the pipeline transporting powder raw materials from the powder raw material feeding hopper to the powder storage tank is controlled by comparing the real-time quality data in the powder storage tank with the preset quality data; the on / off state of the pipeline transporting liquid raw materials from the liquid raw material feeding hopper to the liquid storage tank is controlled by comparing the real-time quality data in the liquid storage tank with the preset quality data.

[0016] The beneficial effects of this invention are as follows: This invention can isolate air impurities; throughout the entire feeding and homogenization process, the slurry is in a sealed state, and the vacuum environment effectively isolates harmful substances such as oxygen and moisture. This invention enables precise metering and feeding; through vacuum negative pressure conveying and precise weighing, it achieves accurate metering and uniform feeding of powdered or liquid raw materials, reducing human error, ensuring accurate proportions of each group, and improving electrode consistency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart of the sodium electrolytic homogenization coating method of the present invention. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0020] One embodiment of the present invention provides a sodium electrolytic slurry coating apparatus, comprising a powder raw material feeding silo and a liquid raw material feeding silo. The powder raw material feeding silo and the liquid raw material feeding silo respectively transport the powder raw material and liquid raw material in the material storage chamber to the powder storage tank and the liquid storage tank, respectively. The powder storage tank is connected to a dispersion tank. A first vacuum feeder is provided between the powder storage tank and the dispersion tank to vacuum transport the powder raw material to the dispersion tank. A vibration auxiliary device is provided on the vacuum transport pipeline between the powder storage tank and the dispersion tank to prevent the powder raw material from clogging the vacuum transport pipeline. The powder raw material is vacuum transported from the powder storage tank to the dispersion tank. Both the dispersion tank and the liquid storage tank are connected to a slurry tank. A second vacuum feeder is provided between the dispersion tank and the slurry tank to vacuum transport the powder raw material to the slurry tank. A vibration auxiliary device is provided on the vacuum transport pipeline between the dispersion tank and the slurry tank to prevent the powder raw material from clogging the vacuum transport pipeline. A vacuum pump is provided between each liquid storage tank and the slurry tank, and the powder raw material and liquid raw material are vacuum transported from the dispersion tank and the liquid storage tank to the slurry tank, respectively.

[0021] An online viscometer is installed in the homogenizing tank to monitor the viscosity of the slurry in the tank in real time. The online viscometer is electrically connected to the control system and transmits the viscosity signal of the slurry monitored in real time to the control system. The control system can control the start and stop of the homogenization operation based on the slurry viscosity data monitored in real time by the online viscometer.

[0022] The homogenizing tank is connected to the finished product tank, the finished product tank is connected to the transfer tank, the transfer tank is connected to the coating device, and the coating device is equipped with an air filtration unit; it also includes a control system, which regulates the environmental humidity of the material storage chamber, powder raw material feeding silo, liquid raw material feeding silo, powder storage tank, liquid storage tank, homogenizing tank, finished product tank, transfer tank, homogenizing chamber, and coating chamber, as well as the on / off of material conveying in each stage.

[0023] The humidity in the material storage room, powder raw material feeding silo, liquid raw material feeding silo, powder storage tank, liquid storage tank, homogenizing tank, finished product tank, transfer tank, homogenizing room, and coating room is controlled within the range of 0% to 10%RH. Humidity sensors are installed in each corresponding area to monitor the humidity in real time. Based on the real-time humidity data, the control system controls the humidifiers and dehumidifiers to operate. The dehumidifiers are either compressor-type or rotary dehumidifiers, and the humidifiers are either high-pressure micro-mist humidifiers, ultrasonic humidifiers, or electrode-type humidifiers.

[0024] The air filtration unit uses a fan-filter assembly. The air cleaning unit cleans the air as follows: When the fan at the top or side of the air intake fan-filter assembly is activated, a negative pressure effect is created, drawing outside air into the coating equipment. The intake air first passes through a pre-filter to remove larger particles. The air then enters a HEPA or ULPA high-efficiency filter to further remove fine particles, ensuring air cleanliness. The filtered clean air, under the positive pressure generated by the fan, is evenly distributed into the clean area through the outlet, forming a stable clean air layer. The fan-filter assembly continuously circulates the air, maintaining the air quality in the clean area. The control system adjusts the fan speed and airflow to adapt to different cleanliness requirements.

[0025] like Figure 1 As shown, one embodiment of the present invention provides a sodium electrolytic slurry coating method, comprising the following steps: S1, the powder raw material is transported from the powder raw material feeding hopper to the powder storage tank. The powder storage tank is equipped with a weighing module to monitor the quality of the powder raw material in the powder storage tank in real time. The control system compares the real-time quality data in the powder storage tank with the preset quality data to control the opening and closing of the pipeline transporting the powder raw material from the powder raw material feeding hopper to the powder storage tank. The weighing module monitors the quality of the powder in the powder storage tank in real time to ensure the accuracy of feeding during the production process. S2, the powder raw material is conveyed from the powder storage tank into the dispersion tank for premixing through vacuum conveying. The vacuum conveying pipeline is equipped with a vibration auxiliary device to prevent the powder raw material from clogging the vacuum conveying pipeline. S3, the liquid raw material is transported from the liquid raw material feeding hopper to the liquid storage tank; the liquid storage tank is equipped with a weighing module to monitor the quality of the liquid raw material in the liquid storage tank in real time. The control system compares the real-time quality data in the liquid storage tank with the preset quality data to control the opening and closing of the pipeline transporting the liquid raw material from the liquid raw material feeding hopper to the liquid storage tank. The weighing module monitors the quality of the powder in the powder storage tank in real time to ensure the accuracy of feeding during the production process. S4. Powder and liquid raw materials are vacuum-transported from the dispersion tank and liquid storage tank to the homogenizing tank, respectively. A vibration auxiliary device is installed in the vacuum conveying pipeline between the dispersion tank and the homogenizing tank to prevent the powder raw materials from clogging the vacuum conveying pipeline. The powder and liquid raw materials in the homogenizing tank are stirred. An online viscometer is installed in the homogenizing tank to monitor the viscosity of the slurry in real time. The online viscometer is electrically connected to the control system and transmits the real-time viscosity signal of the slurry to the control system. The control system can control the start and stop of the homogenization operation and the opening and closing of the pipeline for conveying the slurry from the homogenizing tank to the next process based on the slurry viscosity data monitored in real time by the online viscometer. The homogenizing tank is equipped with a high-speed stirring function with an adjustable speed of 0~3000rpm and a low-speed wall scraping blade to ensure that the slurry is mixed without dead corners.

[0026] S5, the mixed slurry is transported to the finished product tank, then to the transfer tank, and finally to the coating equipment for coating. External air enters the coating equipment after passing through an air cleaning unit. During the coating process, baking and dust removal are performed in an oven to complete the slurry coating. The air intake fan filter unit, located at the top or side of the unit, generates a negative pressure effect, drawing external air into the coating equipment. The air first passes through a pre-filter to remove larger particles, then enters a HEPA or ULPA high-efficiency filter to further remove fine particles, ensuring air cleanliness. The filtered clean air, under the positive pressure generated by the fan, is evenly distributed into the clean area through the outlet, forming a stable clean air layer. The fan filter unit continuously circulates the air, maintaining the air quality in the clean area. The control system adjusts the fan speed and airflow to adapt to different cleanliness requirements. The humidity of the material storage room, powder raw material feeding silo, liquid raw material feeding silo, powder storage tank, liquid storage tank, homogenizing tank, finished product tank, transfer tank, homogenizing room, and coating room is controlled within the range of 0% ~ 10%RH, effectively controlling the contact between sodium and moisture during the production process.

[0027] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be covered within the protection scope of the present invention.

Claims

1. A sodium-electrolyte homogenizing coating apparatus, characterized in that, It includes a powder raw material feeding silo and a liquid raw material feeding silo, which respectively transport the powder raw material and liquid raw material in the material storage chamber to the powder storage tank and the liquid storage tank. The powder storage tank is connected to a dispersion tank, and the powder raw material is vacuum-transported from the powder storage tank to the dispersion tank. Both the dispersion tank and the liquid storage tank are connected to a homogenizing tank, and the powder raw material and liquid raw material are vacuum-transported from the dispersion tank and the liquid storage tank to the homogenizing tank, respectively. The homogenizing tank is connected to a finished product tank, the finished product tank is connected to a transfer tank, and the transfer tank is connected to a coating device, which is equipped with an air filtration unit. It also includes a control system, which regulates the ambient humidity and material conveying on / off of the material storage chamber, the powder raw material feeding silo, the liquid raw material feeding silo, the powder storage tank, the liquid storage tank, the homogenizing tank, the finished product tank, the transfer tank, the homogenizing chamber, and the coating chamber.

2. The sodium electrolytic homogenizing coating apparatus as described in claim 1, characterized in that, The air filtration unit is equipped with a primary filter and a secondary filter. The primary filter is a pre-filter, and the secondary filter is a HEPA or ULPA high-efficiency filter.

3. The sodium electrolytic homogenizing coating apparatus as described in claim 1, characterized in that, The air filtration unit uses a fan filter assembly.

4. The sodium electrolytic homogenizing coating apparatus as described in claim 1, characterized in that, The ambient humidity of the material storage room, powder raw material feeding silo, liquid raw material feeding silo, powder storage tank, liquid storage tank, homogenizing tank, finished product tank, transfer tank, homogenizing room, and coating room is controlled within the range of 0% ~ 10%RH.

5. The sodium electrolytic homogenizing coating apparatus as described in claim 1, characterized in that, An online viscometer is installed in the homogenizing tank to detect the viscosity of the slurry in the tank, and the online viscometer is electrically connected to the control system.

6. A method for sodium-electrode homogenization coating, characterized in that, Includes the following steps: S1, the powder raw material is transported from the powder raw material feeding hopper to the powder storage tank, and the powder storage tank is equipped with a weighing module to monitor the quality of the powder raw material in the powder storage tank in real time; S2, the powder raw materials are conveyed from the powder storage tank into the dispersion tank through vacuum conveying for premixing; S3, the liquid raw material is transported from the liquid raw material feeding hopper to the liquid storage tank, and the liquid storage tank is equipped with a weighing module to monitor the quality of the liquid raw material in the liquid storage tank in real time; S4, the powder raw materials and liquid raw materials are vacuum-transported from the dispersion tank and liquid storage tank to the homogenizing tank, respectively, and the powder raw materials and liquid raw materials in the homogenizing tank are stirred; S5, the mixed slurry is transported to the finished product tank, the slurry in the finished product tank is then transported to the transfer tank, and the slurry in the transfer tank is then transported to the coating equipment for coating. External air enters the coating equipment after passing through the air cleaning unit. During the coating process, the oven is used for baking and dust removal to complete the slurry coating.

7. The sodium electrolytic homogenization coating method as described in claim 6, characterized in that, The air purification unit includes a primary filter and a secondary filter. The primary filter is a pre-filter, and the secondary filter is a HEPA or ULPA high-efficiency filter.

8. The sodium-electrode homogenizing coating method as described in claim 6, characterized in that, The air cleaning unit cleans the air as follows: After the fan at the top or side of the air intake fan filter unit is started, a negative pressure effect is generated, drawing outside air into the coating equipment. The intake air first passes through a pre-filter to remove larger particles. The air that has passed through the pre-filter then enters a HEPA or ULPA high-efficiency filter to further remove fine particles, ensuring air cleanliness. The filtered clean air is then evenly delivered into the clean area through the air outlet under the positive pressure generated by the fan, forming a stable clean air layer. The fan filter unit continuously circulates the air, maintaining the air quality in the clean area. The control system adjusts the fan speed and air volume to adapt to different cleanliness requirements.

9. The sodium electrolytic homogenization coating method as described in claim 6, characterized in that, The ambient humidity of the material storage room, powder raw material feeding silo, liquid raw material feeding silo, powder storage tank, liquid storage tank, homogenizing tank, finished product tank, transfer tank, homogenizing room, and coating room is controlled within the range of 0% ~ 10%RH.

10. The sodium-electrode homogenizing coating method as described in claim 6, characterized in that, The on / off state of the pipeline transporting powder raw materials from the powder raw material feeding hopper to the powder storage tank is controlled by comparing real-time quality data in the powder storage tank with preset quality data; the on / off state of the pipeline transporting liquid raw materials from the liquid raw material feeding hopper to the liquid storage tank is controlled by comparing real-time quality data in the liquid storage tank with preset quality data.

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