Lithium ion battery positive electrode material drying process heat energy recovery device
By designing a combination of drying chamber, filter box and heat exchange chamber, the problems of insufficient heat utilization and material blockage during the drying process of lithium-ion battery cathode materials are solved, achieving efficient heat recovery and improved drying efficiency.
Patent Information
- Application Number
- CN202422713145.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-07
AI Technical Summary
During the drying process of lithium-ion battery cathode materials, the heat from the exhaust air is not fully utilized, and the material carried in the hot air causes blockage of the heat exchanger, preventing the effective discharge of condensate and affecting the drying efficiency.
A heat recovery device comprising a drying chamber, a filter box, a heat exchange chamber, and a drain chamber was designed. The filter box filters out low-mesh precursors, the air supply pipe and the heat exchange chamber recover heat, and the drain chamber collects condensate, thus solving the problems of insufficient heat utilization and material blockage.
It realizes the full recovery and utilization of exhaust heat, avoids the blockage of heat exchanger, improves the drying efficiency and ensures the effective discharge of condensed water.
Smart Images
Figure CN223484945U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of lithium-ion battery production, and in particular relates to a heat recovery device for the drying process of lithium-ion battery cathode materials. Background Art
[0002] The commercialization of electric vehicles has developed rapidly in recent years, leading to a rapid increase in demand for power batteries. Nickel-cobalt-manganese ternary lithium batteries, with their advantages of high specific capacity, good cycle performance, good safety performance, low price, and ease of synthesis, have effectively solved the balance between performance and capacity in power batteries, basically meeting all the needs of power battery materials. The industry has developed rapidly in recent years. However, the precursor for the positive electrode, after production, needs to be dried using drying equipment, but it still has the following drawbacks in practical use:
[0003] Currently, the drying process in the production of ternary precursors uses a hot air circulating oven, which relies on energy sources such as electricity and steam to raise the temperature to the set temperature for drying the material. The drying process requires exhaust ventilation and dehumidification. Depending on the material, the exhaust ventilation temperature is between 95℃ and 120℃. This heat is released into the atmosphere and is not utilized.
[0004] Because the oven discharge carries out some materials with extremely low mesh size, the heat exchange surfaces of traditional heat exchangers, heat pumps and other heat recovery devices will be covered by the materials, resulting in low heat recovery efficiency. Furthermore, after heat recovery, the moisture in the air will condense and form water vapor due to the decrease in hot air temperature. This water vapor will remain in the pipeline and be recovered into the oven, causing a decrease in drying efficiency. Utility Model Content
[0005] The purpose of this utility model is to provide a heat recovery device for the drying process of lithium-ion battery cathode materials. By setting up a drying chamber, a filter box, a heat exchange chamber and a drainage chamber, it solves the problems that the heat of the exhaust air during the drying process of the precursor cannot be fully utilized, and that the hot air discharged from the drying chamber carries materials that cause blockage of the heat exchanger and that there is no drainage facility for condensate.
[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:
[0007] This utility model relates to a heat recovery device for the drying process of lithium-ion battery cathode materials, comprising a drying chamber, a filter box, a heat exchange chamber, and a drainage chamber. The filter box is positioned above the top of the drying chamber. A gas supply pipe is fixedly connected to the output end of the filter box. The gas supply pipe is U-shaped, and an inner sleeve is fixed to the horizontal portion of the gas supply pipe. Spiral blades are fixed to the periphery of the inner sleeve. A heat exchange chamber is fixed to the periphery of the horizontal portion of the gas supply pipe. The two ends of the inner sleeve are respectively fixed to the two end faces of the inner wall of the heat exchange chamber. The gas supply pipe is positioned away from the filter box. The end is fixedly connected to a drain chamber, and an air inlet pipe is fixedly fixed in the center of the bottom of the drain chamber. The bottom end of the drain chamber on one side of the air inlet pipe is fixedly connected to a drain pipe. During operation, the precursor in the refractory is dried through the drying chamber. The precursor with a small mesh size in the air output from the drying chamber is filtered out through the filter box. The filtered air is delivered to the air supply pipe. After being delivered through the air supply pipe, it is delivered to the drain chamber. The condensed water is left in the drain chamber and discharged through the air. The heat in the air in the air is recovered through the heat exchange chamber and the air supply pipe.
[0008] Furthermore, the top of the drying chamber is fixedly connected to an exhaust pipe and a return pipe. The exhaust pipe and the return pipe are symmetrical to each other along the center line parallel to the short side of the top of the drying chamber. The top end of the exhaust pipe is fixedly connected to the input end of the filter box. The drying chamber discharges the air after drying the precursor through the exhaust pipe and returns the air that has recovered heat and removed condensate to the drying chamber through the return pipe.
[0009] Furthermore, a filter element is fixed to the bottom of the filter box, and the filter element is connected to the inlet of the filter box. The filter box filters the low-mesh precursor passing through it through the filter element.
[0010] Furthermore, a spiral blade is fixed to the periphery of the inner sleeve, and the spiral blade is fixed to the inner wall of the heat exchange cavity. The inner sleeve and the spiral blade cooperate to fully cool the water passing through the heat exchange cavity.
[0011] Furthermore, a hot water pipe is fixedly connected to the upper part of the heat exchange chamber near the edge of the filter box, and an inlet pipe is fixedly connected to the lower part of the drain chamber near the edge of the drain chamber. The drain pipe and the inlet pipe are symmetrical along the center of the heat exchange chamber. The drain chamber discharges the heat exchanged hot water to the recovery device through the hot water pipe.
[0012] Furthermore, the top of the air inlet pipe is fixed with connecting columns in a ring array, and the top of all the connecting columns is fixed with a waterproof cap. The top of the drain chamber is fixedly connected to a top pipe, and the top of the top pipe is fixedly connected to the end of the air supply pipe away from the filter box. The bottom of the drain chamber is fixedly connected to a return pipe. The air inlet pipe and the return pipe are fixedly connected to each other, so that the air in the drain chamber after heat exchange and removal of condensate flows back into the drying chamber.
[0013] This utility model has the following beneficial effects:
[0014] This invention solves the problem of insufficient utilization of exhaust heat during precursor drying by setting up a drying chamber, a filter box, and a heat exchange chamber. The air discharged from the drying chamber is transported to the exhaust pipe, then to the filter box, and finally to the air supply pipe. The air supply pipe then transports the air to the drain chamber. When the hot air passes through the air supply pipe, the drain chamber transports heat exchange water to the heat exchange chamber through the water inlet pipe. After heat exchange in the heat exchange chamber, the water is discharged through the hot water pipe. The heat exchange water passes through the heat exchange chamber and, with the help of the spiral blades on the inner circumference, rapidly absorbs the heat from the air passing through the air supply pipe, thus recovering the heat from the air passing through the air supply pipe. This allows the heat from the exhaust air during precursor drying to be fully recovered and utilized.
[0015] This invention solves the problems of heat exchanger blockage caused by materials carried in the hot air discharged from the oven, and the lack of condensate drainage facilities, by setting up a drying chamber, filter box, heat exchange chamber, and drainage chamber. The filter box filters out low-mesh precursors in the incoming air through the filter element. After recovering heat, the air is transported to the top pipe through the air supply pipe, and then to the drainage chamber through the top pipe. It is blown to the outside of the waterproof cap and to the bottom of the drainage chamber. The condensate is collected at the bottom of the drainage chamber and discharged through the drain pipe. The air enters the top of the air inlet pipe through the gap between the connecting columns, and is transported to the exhaust pipe through the air inlet pipe after cooling. It then flows back to the drying chamber through the exhaust pipe. This allows the materials carried in the hot air discharged from the oven to be effectively filtered out, and the condensate can be effectively discharged after the air flows back. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 A three-dimensional view of the assembly structure of a heat recovery device for the drying process of lithium-ion battery cathode materials;
[0018] Figure 2 This is a 3D view of the drying chamber structure;
[0019] Figure 3 A three-dimensional cross-sectional view of the filter box section;
[0020] Figure 4 A three-dimensional cross-sectional view of the heat exchange cavity;
[0021] Figure 5 This is a three-dimensional sectional view of the drainage cavity.
[0022] Figure label:
[0023] 1. Drying chamber; 101. Exhaust pipe; 102. Return pipe; 2. Filter box; 201. Filter element; 3. Heat exchange chamber; 301. Air supply pipe; 302. Spiral blades; 303. Water inlet pipe; 304. Hot water pipe; 305. Inner sleeve; 4. Drainage chamber; 401. Drainage pipe; 402. Air inlet pipe; 403. Connecting column; 404. Waterproof cap; 405. Top pipe. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. Specific Implementation Example 1
[0025] Please see Figure 1-4 This utility model relates to a heat recovery device for the drying process of lithium-ion battery cathode materials, comprising a drying chamber 1, a filter box 2, a heat exchange chamber 3, and a drainage chamber 4. The filter box 2 is installed on the top of the drying chamber 1. During operation, the precursor is dried through the drying chamber 1, and air is discharged during the drying process. The air discharged from the drying chamber 1 is filtered by the filter box 2 and then transported to the air supply pipe 301. The output end of the filter box 2 is fixedly connected to the air supply pipe 301. The air discharged from the drying chamber 1 is heat-exchanged through the heat exchange chamber 3 and then transported to the drainage chamber 4 through the air supply pipe 301. The air supply pipe 301 is U-shaped, and an inner sleeve 305 is fixed to the horizontal part of the air supply pipe 301. Spiral blades 302 are fixed to the periphery of the inner sleeve 305. A heat exchange chamber 3 is fixed around the horizontal part of the air supply pipe 301. The two ends of the inner sleeve 305 are respectively fixed to the two end faces of the inner wall of the heat exchange chamber 3. During operation, heat exchange water passes through the heat exchange chamber 3 and, when passing around the inner sleeve 305, cooperates with the spiral blades 302 to quickly absorb the heat in the air passing through the air supply pipe 301 and recover the heat discharged from the drying chamber 1. The end of the air supply pipe 301 away from the filter box 2 is fixedly connected to the drain chamber 4. An air inlet pipe 402 is fixedly fixed in the center of the bottom of the drain chamber 4. The bottom end of the drain chamber 4 on one side of the air inlet pipe 402 is fixedly connected to the drain pipe 401. The condensate generated during the air supply is collected through the drain chamber 4 and discharged through the drain pipe 401. The returning air flows back to the return pipe 102 through the air inlet pipe 402.
[0026] Specifically, the top of the drying chamber 1 is fixedly connected to an exhaust pipe 101 and a return pipe 102. The exhaust pipe 101 and the return pipe 102 are symmetrical about each other along the center line parallel to the short side of the top of the drying chamber 1. The top end of the exhaust pipe 101 is fixedly connected to the input end of the filter box 2. The drying chamber 1 delivers the hot air containing the drying precursor to the filter box 2 through the exhaust pipe 101. After the air recovers heat and removes condensate, it flows back to the drying chamber 1 through the return pipe 102.
[0027] Furthermore, a filter element 201 is fixed to the bottom of the filter box 2. The filter element 201 is connected to the inlet of the filter box 2. The filter box 2 filters out low-mesh precursors in the air that enters it through the filter element 201.
[0028] Furthermore, a spiral blade 302 is fixed to the periphery of the inner sleeve 305. The spiral blade 302 is fixed to the inner wall of the heat exchange chamber 3, and the inner sleeve 305 increases the heat exchange rate through the spiral blade 302.
[0029] Furthermore, a hot water pipe 304 is fixedly connected to the upper part of the heat exchange chamber 3 near the edge of the filter box 2. The hot water pipe 304 is connected to the pipeline for recovering hot water. An inlet pipe 303 is fixedly connected to the lower part of the heat exchange chamber 3 near the edge of the drain chamber 4. The inlet pipe 303 is connected to the pipeline for supplying water, so that the water for heat exchange is transported to the heat exchange chamber 3. The hot water pipe 304 and the inlet pipe 303 are symmetrical along the center of the interior of the heat exchange chamber 3. The drain chamber 4 transports the water for heat exchange to the heat exchange chamber 3 through the inlet pipe 303. After heat exchange in the heat exchange chamber 3, the water is discharged through the hot water pipe 304, thus recovering heat from the air passing through the air supply pipe 301.
[0030] The operation process of this embodiment is as follows: During operation, the air discharged from the drying chamber 1 is delivered to the exhaust pipe 101, and then to the filter box 2 through the exhaust pipe 101. After the precursor with a lower mesh size is filtered by the filter element 201 in the filter box 2, it is delivered to the air supply pipe 301, and then to the drain chamber 4 through the air supply pipe 301. When the hot air passes through the air supply pipe 301, the drain chamber 4 delivers heat exchange water to the heat exchange chamber 3 through the water inlet pipe 303. After heat exchange in the heat exchange chamber 3, it is discharged through the hot water pipe 304. The heat exchange water passes through the heat exchange chamber 3 and, when it passes through the inner sleeve 305, cooperates with the spiral blades 302 to quickly absorb the heat in the air passing through the air supply pipe 301 and recover the heat in the air passing through the air supply pipe 301. Specific Implementation Example 2
[0031] Please see Figure 1 , 25. Based on the specific embodiment one, the top end of the air inlet pipe 402 is fixed with connecting columns 403 in a ring array. The top ends of all connecting columns 403 are fixed with waterproof caps 404. The top end of the drain chamber 4 is fixedly connected to the top pipe 405. The top end of the top pipe 405 is fixedly connected to the end of the air supply pipe 301 away from the filter box 2. The bottom end of the drain chamber 4 is fixedly connected to the return pipe 102. The air inlet pipe 402 and the return pipe 102 are fixedly connected to each other. When the air inlet pipe 402 is working, the waterproof caps 404 are connected to the top end of the air inlet pipe 402 through the connecting columns 403 to prevent air from being delivered from the top pipe 405 to the drain chamber 4 and then directly blown into the air inlet pipe 402, causing condensate to be discharged into the drying chamber 1.
[0032] The operation process of this embodiment is as follows: During operation, after the air recovers heat, it is transported to the top pipe 405 through the air supply pipe 301, and then to the drain chamber 4 through the top pipe 405. It is blown to the outside of the waterproof cap 404 and to the bottom of the drain chamber 4. The condensate is collected at the bottom of the drain chamber 4 and discharged through the drain pipe 401. The air enters the top of the air inlet pipe 402 through the gap between the connecting columns 403. The cooled air is transported to the exhaust pipe 101 through the air inlet pipe 402 and then flows back to the drying chamber 1 through the exhaust pipe 101.
[0033] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0034] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.
Claims
1. A heat recovery device for the drying process of lithium-ion battery cathode materials, comprising a drying chamber (1), a filter box (2), a heat exchange chamber (3), and a drainage chamber (4), characterized in that: A filter box (2) is provided above the top of the drying box (1). The output end of the filter box (2) is fixedly connected to an air supply pipe (301). The air supply pipe (301) is U-shaped and an inner sleeve (305) is fixed to the horizontal part of the air supply pipe (301). Spiral blades (302) are fixed to the periphery of the inner sleeve (305). A heat exchange chamber (3) is fixed to the periphery of the horizontal part of the air supply pipe (301). The two ends of the inner sleeve (305) are respectively fixed to the two end faces of the inner wall of the heat exchange chamber (3). The end of the air supply pipe (301) away from the filter box (2) is fixedly connected to a drain chamber (4). An air inlet pipe (402) is fixed to the center of the bottom of the drain chamber (4). A drain pipe (401) is fixedly connected to the bottom end of the drain chamber (4) on one side of the air inlet pipe (402).
2. The heat recovery device for the drying process of lithium-ion battery cathode material according to claim 1, characterized in that: The top of the drying chamber (1) is fixedly connected to an exhaust pipe (101) and a return pipe (102). The exhaust pipe (101) and the return pipe (102) are symmetrical about each other along the center line parallel to the short side of the top of the drying chamber (1). The top end of the exhaust pipe (101) is fixedly connected to the input end of the filter box (2).
3. The heat recovery device for the drying process of lithium-ion battery cathode material according to claim 1, characterized in that: The filter element (201) is fixed at the bottom of the filter box (2), and the filter element (201) is connected to the inlet of the filter box (2).
4. The heat recovery device for the drying process of lithium-ion battery cathode material according to claim 1, characterized in that: The inner sleeve (305) is fixed with a spiral blade (302) on its periphery, and the spiral blade (302) is fixed on the inner wall of the heat exchange chamber (3).
5. The heat recovery device for the drying process of lithium-ion battery cathode material according to claim 1, characterized in that: A hot water pipe (304) is fixedly connected to the upper part of the heat exchange chamber (3) near the edge of the filter box (2), and an inlet pipe (303) is fixedly connected to the lower part of the heat exchange chamber (3) near the edge of the drain chamber (4). The hot water pipe (304) and the inlet pipe (303) are symmetrical along the center of the heat exchange chamber (3).
6. The heat recovery device for the drying process of lithium-ion battery cathode material according to claim 2, characterized in that: The top end of the air inlet pipe (402) is fixed with connecting columns (403) in a ring array. The top ends of all the connecting columns (403) are fixed with waterproof caps (404). The top end of the drain cavity (4) is fixedly connected with a top pipe (405). The top end of the top pipe (405) is fixedly connected with the end of the air supply pipe (301) away from the filter box (2). The bottom end of the drain cavity (4) is fixedly connected with the return pipe (102). The air inlet pipe (402) and the return pipe (102) are fixedly connected to each other.