Special anti-oxidation spray dryer for solid-state battery raw materials
By using inert gas argon and gas internal circulation system in the spray dryer, the problems of oxidation and thermal decomposition of solid battery active substances during spray drying are solved, and rapid and uniform drying is achieved, improving the stability and production efficiency of the battery.
Patent Information
- Application Number
- CN202422327483.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-23
AI Technical Summary
During the spray drying process, the active substances of solid-state batteries are prone to react with oxygen, resulting in self-discharge and performance degradation. In the prior art, the long heating time of hot air causes the material to thermally decompose at high temperatures, making it impossible to achieve rapid and uniform drying.
The inert gas argon gas is used as the drying medium to design the internal gas circulation system, including bag dust collector, waste heat recovery, air induction fan, high-efficiency filter, dehumidifier and heat exchange box, to realize closed thermal circulation, and the raw materials are atomized into tiny droplets through the atomizer to mix with hot air, and uniform distribution is used to reduce residence time and oxidation risks.
It improves drying speed and efficiency, reduces self-discharge phenomenon and thermal decomposition risks, ensures the stability and safety of the battery, reduces energy consumption and production costs, and improves product quality.
Smart Images
Figure CN223127269U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of solid-state batteries, and particularly relates to an anti-oxidation spray dryer dedicated for raw materials of solid-state batteries. Background Art
[0002] During the manufacturing process of solid-state batteries, spray drying is a commonly used raw material preparation method. During the spray drying process, active substances such as the positive electrode material and negative electrode material of solid-state batteries are prone to react with oxygen when exposed to air, resulting in changes in the structure of the active substances and affecting battery performance. During the spray drying process, if the active substances in the raw materials react with oxygen, it may lead to the phenomenon of self-discharge of the battery. Self-discharge will cause a decline in battery performance and may even pose safety problems. Therefore, during the spray drying process, anti-oxidation measures can reduce the probability of contact between active substances and oxygen, thereby reducing the contact between active substances and oxygen and improving their stability.
[0003] Currently, a closed-loop spray dryer is used to process dry heat-sensitive, easily oxidized or organic solvent-containing materials, and an inert gas is used as the drying medium to avoid contact between the materials and oxygen in the air and prevent oxidation. After drying and solvent recovery, the inert gas will be cooled, separated and purified to remove moisture and impurities in it, and then reheated for recycling. In this way, the high-speed hot air effect of the closed-loop spray dryer cannot be achieved through cooling, so that the hot air entering the closed-loop spray dryer needs to be heated for a long time to achieve it. In this way, the residence time of the materials during drying is long, and they will be in a high-temperature state for a long time and undergo thermal decomposition, which cannot ensure the rapid and uniform drying of the materials and cannot effectively reduce heat loss. Summary of the Utility Model
[0004] The technical problem to be solved by the present invention is that in the above-mentioned prior art, the hot air needs to be heated for a long time to achieve, so that the residence time of the materials during drying is long, and they will be in a high-temperature state for a long time and undergo thermal decomposition.
[0005] To achieve the above purpose, the utility model provides the following technical solutions:
[0006] An anti-oxidation spray dryer dedicated for raw materials of solid-state batteries, comprising a drying tower and a gas internal circulation mechanism. Argon, an inert gas, is used as the drying medium for the raw materials of solid-state batteries inside the drying tower; the gas internal circulation mechanism is used to cooperate with the closed-loop thermal circulation of the inert gas inside the drying tower, and the gas internal circulation mechanism includes a bag filter, a waste heat recovery device, a draft fan, a high-efficiency filter, a dehumidifier, a heat exchange box and a heater;
[0007] The dried solid-state battery raw material powder in the drying tower is entrained by the gas in the drying tower and discharged from the drying tower. It enters the bag filter through pipeline A. The powder is separated from gas and discharged by the bag filter. The high-temperature and high-humidity tail gas enters the waste heat recovery device through pipeline B. The waste heat recovery device is connected to the air inlet of the induced draft fan through pipeline C. The air outlet of the induced draft fan is connected to the air inlet of the high-efficiency filter through pipeline D. The air outlet of the high-efficiency filter is connected to the air inlet of the dehumidifier through pipeline E. The air outlet of the dehumidifier is connected to the serpentine heat exchange pipe in the heat exchange box through pipeline F. The air outlet of the serpentine heat exchange pipe in the heat exchange box is connected to the heater through pipeline G. The heater is connected to the air inlet volute at the top of the drying tower through pipeline H.
[0008] The special anti-oxidation spray dryer for solid-state battery raw materials is designed with a complete gas internal circulation system, which can effectively solve the problems encountered by traditional closed-circuit spray dryers when dealing with heat-sensitive, easily oxidized or organic solvent-containing materials. Using inert gas (such as argon) as the drying medium, it avoids the contact between active substances and oxygen in the air, effectively preventing the occurrence of oxidation reactions. The gas internal circulation system can keep the drying medium in an inert environment all the time, further reducing the oxidation risk of active substances.
[0009] Through the gas internal circulation mechanism, the rapid circulation of hot air is realized, the drying speed is increased, the residence time of materials during the drying process is reduced. The design of the heat exchange box and the heater ensures the stable temperature of the hot air, which helps the materials to be dried quickly and evenly, reducing the phenomenon of thermal decomposition at high temperatures. The waste heat recovery device can recover the heat in the tail gas for preheating the drying medium, improving the utilization efficiency of thermal energy. Through the closed-circuit circulation, the heat loss is reduced and the energy consumption is lowered.
[0010] By reducing the contact between active substances and oxygen, the self-discharge phenomenon is reduced, ensuring the stability and safety of the battery. Avoiding thermal decomposition at high temperatures ensures that the effective components in the materials are not damaged, thereby improving the product quality. By improving the utilization efficiency of thermal energy and reducing energy consumption, it helps to reduce the production cost. Reducing the residence time of materials during the drying process increases the production efficiency and production capacity. The gas internal circulation system reduces waste gas emissions, which is beneficial to environmental protection.
[0011] It can effectively avoid the thermal decomposition and oxidation of materials during the spray drying process. Adopting the rapid drying technology, by using high-speed hot air, the residence time of materials during the drying process is short, thus avoiding thermal decomposition and oxidation when being in a high-temperature state for a long time. This high-speed drying method ensures the rapid and uniform drying of materials, reducing heat loss and oxidation risk.
[0012] Preferably, it further includes a high-pressure gas cylinder for storing inert gas and a gas replenishing pump. The gas replenishing pump is connected to the gas replenishing pump through Pipeline I, and the gas outlet of the gas replenishing pump is connected to Pipeline F through Pipeline J.
[0013] The high-pressure gas cylinder is used to store a large amount of inert gas to ensure an adequate inert environment during the drying process. The gas replenishing pump can replenish inert gas as needed to maintain the stability of the gas pressure in the system and ensure the continuity and safety of the drying process.
[0014] Preferably, the drying tower, the bag filter, and the waste heat recovery device are all installed on a frame, and a maintenance ladder is provided on the frame.
[0015] Installing the drying tower, the bag filter, and the waste heat recovery device on the same frame and providing a maintenance ladder can facilitate the daily maintenance and emergency repair of the staff. The centralized structural design and convenient passage reduce the risk of high-altitude operation for the staff and improve work efficiency and safety.
[0016] Preferably, a circulating inlet pipe and a circulating outlet pipe are connected to the heat exchange box. Both the circulating inlet pipe and the circulating outlet pipe are connected to the waste heat recovery device, and the circulating outlet pipe is connected to Pipeline C after entering the waste heat recovery device.
[0017] The design of the circulating inlet pipe and the circulating outlet pipe enables a closed cycle to be formed between the heat exchange box and the waste heat recovery device, which is used for the heat energy exchange of the inert gas after heat recovery and the heat energy exchange of the newly added inert gas, improving the utilization efficiency of heat energy and reducing energy waste.
[0018] Preferably, the air outlet of the air supply volute is connected to the hot air distributor inside the top of the drying tower, and the hot air is evenly distributed into the tower body of the drying tower in a spiral and scattered manner through the hot air distributor.
[0019] Through the hot air distributor, the hot air can be evenly distributed in the drying tower, forming a spiral and scattered flow, which helps the material to be heated more evenly, improving the drying efficiency and uniformity.
[0020] Preferably, an atomizer is installed inside the top of the drying tower. The atomizer atomizes the liquid material of the solid-state battery raw material into tiny droplets and mixes and exchanges heat energy with the inert hot gas entering the top of the tower.
[0021] The atomizer atomizes the liquid material of the solid-state battery raw material into tiny droplets, which are fully mixed with the inert hot gas, increasing the heat exchange area and improving the heat exchange efficiency. The atomized raw material in the form of tiny droplets comes into fuller contact with the hot air in the drying tower, enabling the moisture to be removed more quickly and obtaining a higher-quality dried product.
[0022] Preferably, the atomizer is connected to the solid-state battery raw material liquid storage tank through a feed pipe and a feed pump.
[0023] The feed pump is connected to the raw material liquid storage tank through a feeding pipe, which can continuously and stably supply raw materials, ensuring the continuity of the drying process. The feed pump can accurately control the feeding speed and quantity, which helps to accurately control the humidity during the drying process and ensure the product quality.
[0024] Compared with the prior art, the technical effects and advantages of the present utility model are as follows:
[0025] In this special anti-oxidation spray dryer for solid-state battery raw materials, the liquid material of the solid-state battery raw materials is atomized into tiny droplets by an atomizer. The atomized tiny droplets are mixed with the inert hot gas (argon) entering from the top of the drying tower. The mixed gas undergoes heat exchange and drying in the drying tower. The dried powder is entrained by the gas and enters the bag filter through pipeline A for gas-solid separation. The separated tail gas enters the waste heat recovery device through pipeline B to recover heat. The tail gas passes through an induced draft fan, a high-efficiency filter, and a dehumidifier to remove fine particles and moisture. After further recovering heat through the heat exchange box, the tail gas is heated by a heater and then returned to the top of the drying tower. If necessary, inert gas is supplemented into the system through a gas supplement pump to maintain stable pressure.
[0026] Using inert gas as the drying medium can effectively prevent the active substances from contacting with oxygen and prevent oxidation reactions. It reduces the self-discharge phenomenon and improves the stability and safety of the battery.
[0027] The uniform distribution of hot air is achieved through a hot air distributor, which improves the drying efficiency and uniformity. The rapid drying technology reduces the residence time of the material during the drying process, reducing the risks of thermal decomposition and oxidation. The design of the atomizer increases the heat exchange area and improves the heat exchange efficiency, thus obtaining high-quality dried products. The waste heat recovery device recovers the heat in the tail gas for preheating the drying medium, improving the thermal energy utilization efficiency. The closed-loop cycle reduces heat loss, lowers energy consumption and production costs. The continuous and stable raw material supply ensures the continuity of the drying process. Description of the Drawings
[0028] Figure 1 It is a schematic structural diagram of the first perspective of the present utility model;
[0029] Figure 2 It is a schematic structural diagram of the second perspective of the present utility model;
[0030] Figure 3 It is a top view of the present utility model;
[0031] Figure 4 It is an internal view of the heat exchange box of the present utility model.
[0032] In the figure: 1, drying tower; 2, bag filter; 3, waste heat recovery device; 4, induced draft fan; 5, high-efficiency filter; 6, dehumidifier; 7, heat exchange box; 8, heater; 9, pipe A; 10, pipe B; 11, pipe C; 12, pipe D; 13, pipe E; 14, pipe F; 15, pipe G; 16, pipe H; 17, serpentine heat exchange pipe; 18, air inlet volute; 19, high-pressure gas cylinder; 20, gas supply pump; 21, pipe I; 22, pipe J; 23, frame; 24, maintenance ladder; 25, circulating inlet pipe; 26, circulating outlet pipe. Detailed implementation manners
[0033] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0034] The following is a further detailed description in conjunction with the attached Figures 1-4 This application will be further described in detail.
[0035] The embodiment of this application discloses a special anti-oxidation spray dryer for solid-state battery raw materials, which includes a drying tower 1 and a gas internal circulation mechanism. Argon, an inert gas, is used as the drying medium for the solid-state battery raw materials inside the drying tower 1; the gas internal circulation mechanism is used to cooperate with the closed-loop heat circulation of the inert gas inside the drying tower 1. The gas internal circulation mechanism includes a bag filter 2, a waste heat recovery device 3, an induced draft fan 4, a high-efficiency filter 5, a dehumidifier 6, a heat exchange box 7, and a heater 8;
[0036] The dried solid-state battery raw material powder inside the drying tower 1 is entrained by the gas inside the drying tower 1 and discharged from the drying tower 1 through pipe A9 and enters the bag filter 2. The powder is separated from the gas and discharged by the bag filter 2, while the high-temperature and high-humidity tail gas enters the waste heat recovery device 3 through pipe B10. The waste heat recovery device 3 is connected to the air inlet of the induced draft fan 4 through pipe C11. The air outlet of the induced draft fan 4 is connected to the air inlet of the high-efficiency filter 5 through pipe D12. The air outlet of the high-efficiency filter 5 is connected to the air inlet of the dehumidifier 6 through pipe E13. The air outlet of the dehumidifier 6 is connected to the serpentine heat exchange pipe 17 inside the heat exchange box 7 through pipe F14. The air outlet of the serpentine heat exchange pipe 17 inside the heat exchange box 7 is connected to the heater 8 through pipe G15. The heater 8 is connected to the air inlet volute 18 at the top of the drying tower 1 through pipe H16.
[0037] It also includes a high-pressure gas cylinder 19 for storing inert gas and a gas replenishing pump 20. The gas replenishing pump 20 is connected to the high-pressure gas cylinder 19 through pipeline I21, and the gas outlet of the gas replenishing pump 20 is connected to pipeline F14 through pipeline J22.
[0038] The high-pressure gas cylinder 19 is used to store a large amount of inert gas to ensure an adequate inert environment during the drying process. The gas replenishing pump 20 can replenish inert gas as needed to maintain the stability of the gas pressure in the system and ensure the continuity and safety of the drying process.
[0039] A circulating inlet pipe 25 and a circulating outlet pipe 26 are connected to the heat exchange box 7. Both the circulating inlet pipe 25 and the circulating outlet pipe 26 are connected to the waste heat recovery device 3. After the circulating outlet pipe 26 enters the waste heat recovery device 3, it is connected to pipeline C11. The design of the circulating inlet pipe 25 and the circulating outlet pipe 26 enables a closed cycle to be formed between the heat exchange box 7 and the waste heat recovery device 3 for the heat energy exchange of the inert gas after heat recovery and the heat energy exchange of the newly added inert gas, improving the utilization efficiency of heat energy and reducing energy waste.
[0040] The high-pressure gas cylinder 19 is used to store inert gas (argon). The gas replenishing pump 20 is connected to the high-pressure gas cylinder 19 through pipeline I21 to ensure the supply and pressure stability of the inert gas in the system. The liquid material of the solid-state battery raw material is atomized into tiny droplets by an atomizer. The tiny droplets are mixed with the inert hot gas (argon) entering from the top of the drying tower 1 and undergo heat exchange and drying inside the tower body.
[0041] The dried solid-state battery raw material powder is carried out of the drying tower 1 by the gas and enters the bag filter 2 through pipeline A9 for gas-solid separation. The separated powder is discharged from the bag filter 2, and the high-temperature and high-humidity tail gas enters the waste heat recovery device 3 through pipeline B10. The tail gas coming out of the waste heat recovery device 3 is connected to the air inlet of the induced draft fan 4 through pipeline C11. The induced draft fan 4 provides the air flow power. The air outlet of the induced draft fan 4 is connected to the air inlet of the high-efficiency filter 5 through pipeline D12. The high-efficiency filter 5 is used to purify the fine particles in the tail gas. The filtered tail gas is connected to the air inlet of the dehumidifier 6 through pipeline E13. The dehumidifier 6 is used to remove the moisture in the tail gas. The dehumidified tail gas is connected to the serpentine heat exchange tube 17 in the heat exchange box 7 through pipeline F14. The heat exchange box 7 is used to further recover heat. The air outlet of the serpentine heat exchange tube 17 in the heat exchange box 7 is connected to the heater 8 through pipeline G15. The heater 8 is used to heat the gas to provide the heat required for drying. The heated gas returns to the air inlet volute 18 at the top of the drying tower 1 through pipeline H16 to complete the closed-loop heat cycle.
[0042] If inert gas needs to be supplemented during the cycle, the gas outlet of the gas supply pump 20 is connected to the pipeline F14 through the pipeline J22 to input additional inert gas into the system.
[0043] The entire process realizes a continuous, efficient, and anti-oxidation spray drying process for solid-state battery raw materials through the above steps, ensuring product quality and production efficiency.
[0044] Specifically, the drying tower 1, the bag filter 2, and the waste heat recovery device 3 are all installed on the frame 23, and a maintenance ladder 24 is provided on the frame 23. Installing the drying tower 1, the bag filter 2, and the waste heat recovery device 3 on the same frame 23 and providing a maintenance ladder 24 facilitate daily maintenance and emergency repair by the staff. The centralized structural design and convenient passage reduce the risk of high-altitude operation for the staff and improve work efficiency and safety.
[0045] Specifically, the air outlet of the air supply volute is connected to the hot air distributor inside the top of the drying tower 1, and the hot air is evenly distributed in a spiral and scattered manner into the tower body of the drying tower 1 through the hot air distributor. Through the hot air distributor, the hot air can be evenly distributed in the drying tower 1, forming a spiral and scattered flow, which helps the material to be heated more evenly, improving the drying efficiency and uniformity.
[0046] Specifically, an atomizer is installed inside the top of the drying tower 1. The atomizer atomizes the liquid material of the solid-state battery raw materials into tiny droplets and mixes and exchanges heat energy with the inert hot gas entering from the top of the tower. The atomizer is connected through a feed pipe to a material pump, and the material pump is connected through a feeding pipe to the liquid storage tank of the solid-state battery raw materials.
[0047] The atomizer atomizes the liquid material of the solid-state battery raw materials into tiny droplets, which are fully mixed with the inert hot gas, increasing the heat exchange area and improving the heat exchange efficiency. The atomized raw materials in the form of tiny droplets come into contact with the hot air more fully in the drying tower 1, and the moisture can be removed more quickly to obtain a higher-quality dried product. The material pump is connected to the raw material liquid storage tank through the feeding pipe, which can supply raw materials continuously and stably, ensuring the continuity of the drying process. The material pump can precisely control the feeding speed and amount, which helps to precisely control the humidity during the drying process and ensure the product quality.
[0048] This special anti-oxidation spray dryer for solid-state battery raw materials is designed with a complete set of gas internal circulation system, which can effectively solve the problems encountered by traditional closed-loop spray dryers when dealing with heat-sensitive, easily oxidized or organic solvent-containing materials. Using inert gas (such as argon) as the drying medium avoids the contact of active substances with oxygen in the air, effectively preventing the occurrence of oxidation reactions. The gas internal circulation system can keep the drying medium in an inert environment all the time, further reducing the oxidation risk of active substances.
[0049] Through the gas internal circulation mechanism, the rapid circulation of hot air is achieved, the drying speed is increased, the residence time of the material during the drying process is reduced, and the design of the heat exchange box 7 and the heater 8 ensures the stable temperature of the hot air, which helps the material to be dried quickly and evenly, reduces the thermal decomposition phenomenon at high temperature, the waste heat recovery device 3 can recover the heat in the tail gas for preheating the drying medium, improves the utilization efficiency of thermal energy, and reduces the heat loss and energy consumption through a closed cycle.
[0050] By reducing the contact between the active substance and oxygen, the self-discharge phenomenon is reduced, ensuring the stability and safety of the battery. The thermal decomposition at high temperature is avoided, ensuring that the effective components in the material are not damaged, thereby improving the product quality. By improving the utilization efficiency of thermal energy and reducing energy consumption, it helps to reduce the production cost. The residence time of the material during the drying process is reduced, the production efficiency is increased, and the production capacity is increased. The gas internal circulation system reduces waste gas emissions, which is beneficial to environmental protection.
[0051] It can effectively avoid the thermal decomposition and oxidation of the material during the spray drying process. Using the rapid drying technology, by using high-speed hot air, the residence time of the material during the drying process is short, thus avoiding thermal decomposition and oxidation in a high-temperature state for a long time. This high-speed drying method ensures the rapid and uniform drying of the material, reducing heat loss and oxidation risk.
[0052] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A special anti-oxidation spray dryer for solid-state battery raw materials, characterized in that, Comprising: A drying tower (1), with inert gas argon used as the drying medium for the solid-state battery raw materials inside the drying tower (1); A gas internal circulation mechanism, which is used to cooperate with the closed-loop thermal circulation of the inert gas inside the drying tower (1). The gas internal circulation mechanism includes a bag filter (2), a waste heat recovery device (3), a draft fan (4), a high-efficiency filter (5), a dehumidifier (6), a heat exchange box (7) and a heater (8); The dried solid-state battery raw material powder inside the drying tower (1) is entrained by the gas inside the drying tower (1) and discharged from the drying tower (1), entering the bag filter (2) through pipeline A (9). The powder is separated from the gas and discharged by the bag filter (2), while the high-temperature and high-humidity tail gas enters the waste heat recovery device (3) through pipeline B (10). The waste heat recovery device (3) is connected to the air inlet of the draft fan (4) through pipeline C (11). The air outlet of the draft fan (4) is connected to the air inlet of the high-efficiency filter (5) through pipeline D (12). The air outlet of the high-efficiency filter (5) is connected to the air inlet of the dehumidifier (6) through pipeline E (13). The air outlet of the dehumidifier (6) is connected to the serpentine heat exchange tube (17) inside the heat exchange box (7) through pipeline F (14). The air outlet of the serpentine heat exchange tube (17) inside the heat exchange box (7) is connected to the heater (8) through pipeline G (15). The heater (8) is connected to the air inlet volute (18) at the top of the drying tower (1) through pipeline H (16).
2. The special anti-oxidation spray dryer for solid-state battery raw materials according to claim 1, characterized in that: It also includes a high-pressure gas cylinder (19) for storing inert gas and a gas supply pump (20). The gas supply pump (20) is connected to itself through pipeline I (21). The gas outlet of the gas supply pump (20) is connected to pipeline F (14) through pipeline J (22).
3. A special anti-oxidation spray dryer for solid-state battery raw materials according to claim 1, characterized in that: The drying tower (1), the bag filter (2) and the waste heat recovery device (3) are all installed on a frame (23), and a maintenance ladder (24) is provided on the frame (23).
4. A special anti-oxidation spray dryer for solid-state battery raw materials according to claim 1, characterized in that: A circulating inlet pipe (25) and a circulating outlet pipe (26) are connected to the heat exchange box (7). Both the circulating inlet pipe (25) and the circulating outlet pipe (26) are connected to the waste heat recovery device (3). After the circulating outlet pipe (26) enters the waste heat recovery device (3), it is connected to pipeline C (11).
5. The special anti-oxidation spray dryer for raw materials of a solid-state battery according to claim 1, characterized in that: The air outlet of the air supply volute is connected to the hot air distributor inside the top of the drying tower (1). The hot air is evenly distributed in a spiral and dispersed manner into the tower body of the drying tower (1) through the hot air distributor.
6. The special anti-oxidation spray dryer for raw materials of solid-state batteries according to claim 1, characterized in that: An atomizer is installed inside the top of the drying tower (1). The atomizer atomizes the liquid material of the solid-state battery raw materials into tiny droplets and mixes and exchanges heat energy with the inert hot gas entering the top of the tower.
7. A special anti-oxidation spray dryer for solid-state battery raw materials according to claim 1, characterized in that: The atomizer is connected to a material pump through a feed pipe, and the material pump is connected to a solid-state battery raw material liquid storage tank through a feeding pipe.