Efficient recycling system for coating slurry

Abstract

The utility model discloses a kind of coating slurry high-efficiency recycling systems, including sequentially connected slurry storage tank, transfer unit, coating valve and coating die head;Coating valve and transfer unit between being equipped with reflux pipeline;The reflux pipeline includes sequentially connected reflux valve and large circulation valve;The discharge end of large circulation valve is connected to slurry storage tank setting.By being additionally provided with reflux pipeline in original coating system, in the case of long time shutdown, old slurry in transfer trolley can be quickly replaced with new slurry in slurry storage tank, let slurry mix in larger range circulation, avoid slurry and appear dry material, sedimentation etc.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery slurry coating technology, and in particular to a high-efficiency recycling system for coating slurry. Background Technology

[0002] In the lithium battery coating production process, the uniformity and recycling of the slurry are crucial. While existing technologies include methods to return excess slurry to a transfer cart and retain slurry in the pre-coating spray nozzle, long-term use leads to slurry waste, insufficient recycling, and easy contamination by impurities, resulting in coating defects and impacting battery quality and production efficiency. Especially during prolonged shutdowns, the slurry is prone to drying, settling, and decreased uniformity, leading to coating defects such as dark spots, scratches, and foil leakage, reducing product yield and equipment efficiency. Current technologies are significantly inadequate in addressing slurry problems caused by prolonged shutdowns, necessitating a more effective solution to achieve full recycling and reuse of the slurry, ensuring its uniformity and consistency, reducing waste, and improving coating quality and production efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a high-efficiency recycling system for coating slurry. By adding a return pipeline to the original coating system, the old slurry in the transfer trolley and the new slurry in the slurry storage tank can be quickly replaced during long-term shutdowns, allowing the slurry to be mixed and circulated over a wider range, thus avoiding problems such as dryness and sedimentation caused by prolonged standing.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] This utility model discloses a high-efficiency recycling system for coating slurry, comprising a slurry storage tank, a transfer unit, a coating valve, and a coating die connected in sequence; a return pipeline is provided between the coating valve and the transfer unit; the return pipeline includes a return valve and a large circulation valve connected in sequence; the discharge end of the large circulation valve is connected to the slurry storage tank.

[0006] A further embodiment: a slurry recovery mechanism is provided below the coating die head; the discharge end of the slurry recovery mechanism is connected to the transfer unit.

[0007] A further embodiment: The slurry recovery mechanism includes a recovery port, a recovery storage tank, a first screw pump, and a recovery valve connected in sequence.

[0008] A further solution: The reflux valve is connected to the transfer unit via a small circulation valve.

[0009] A further solution: A first filter is provided between the transfer unit and the coating valve.

[0010] A further solution: A second filter is provided between the slurry storage tank transfer units.

[0011] A further option: A diaphragm pump is installed between the second filter and the slurry storage tank.

[0012] A further solution: A branch pipeline is provided between the coating die head and the large circulation valve, which is connected in parallel with the pipelines where the return valve and coating valve are located.

[0013] A further option: The transfer unit includes a transfer storage tank and a second screw pump.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention adds a return pipeline and a slurry recovery mechanism to the existing pipeline design, which can switch the slurry path under different working conditions. It can not only achieve full circulation of slurry during the coating process, but also recover the slurry sprayed from the die head for secondary use. This reduces slurry waste, allows for full circulation of slurry, prevents slurry from drying and clumping, and improves the product qualification rate and equipment efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a flowchart illustrating the operation of this utility model.

[0018] Figure 3 This is a diagram of the slurry path during normal coating of this utility model;

[0019] Figure 4 This is a slurry path diagram for cycle 1 of this utility model;

[0020] Figure 5 This is a slurry path diagram during cycle 2 of this utility model;

[0021] Figure 6 This is a slurry path diagram for cycle 3 of this invention;

[0022] In the diagram: 1-Slurry storage tank, 2-Coating back roller, 3-Coating valve, 4-Coating die head, 5-Transfer unit, 51-Transfer trolley, 52-Second screw pump, 6-Return pipeline, 61-Return valve, 62-Large circulation valve, 7-Slurry recovery mechanism, 71-Recovery port, 72-Recovery storage tank, 73-First screw pump, 74-Recovery valve, 8-Small circulation valve, 9-First filter, 10-Second filter, 11-Diaphragm pump, 12-Branch pipeline. Detailed Implementation

[0023] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Please see Figure 1-2 In this embodiment, a high-efficiency recycling system for coating slurry includes a slurry storage tank 1, a transfer unit 5, a coating valve 3, and a coating die 4 connected in sequence. A return pipeline 6 is provided between the coating valve 3 and the transfer unit 5. The return pipeline 6 includes a return valve 61 and a large circulation valve 62 connected in sequence. The outlet end of the large circulation valve 62 is connected to the slurry storage tank 1. By opening and closing the coating valve 3 and the return valve 61, the effective circulation of slurry can be switched between normal coating and long-term shutdown, avoiding problems such as dryness and sedimentation of the slurry due to long-term standing, and ensuring that the overall quality of the slurry always meets the coating requirements.

[0026] Furthermore, a slurry recovery mechanism 7 is provided below the coating die head 4; the discharge end of the slurry recovery mechanism 7 is connected to the transfer unit 5. By providing the slurry recovery mechanism 7 below the coating die head 4, excess slurry sprayed from the coating die head 4 is collected and introduced into the transfer unit 5, where it is mixed with other slurries for reuse, thus avoiding slurry waste and reducing production costs.

[0027] Furthermore, the slurry recovery mechanism 7 includes a recovery port 71, a recovery storage tank 72, a first screw pump 73, and a recovery valve 74 connected in sequence. Excess slurry falls into the recovery port 71 and is collected in the recovery storage tank 72. After being uniformly stirred at a low speed by the first screw pump 73, it is returned to the transfer unit 5 through the recovery valve 74, ensuring that the slurry entering the coating die head 4 is uniform and consistent, thus improving the coating quality.

[0028] Furthermore, the reflux valve 61 is connected to the transfer unit 5 via the small circulation valve 8. When the small circulation valve 8 is open, it works with other components to create a specific slurry circulation path. This circulation realizes the circulation of slurry in the section of the coating pipe before the coating die head 4 in the transfer unit 5, ensuring the fluidity of this part of the slurry, preventing the slurry from settling or clumping in local areas, and maintaining the uniformity of the slurry.

[0029] Furthermore, a first filter 9 is provided between the transfer unit 5 and the coating valve 3. A second filter 10 is provided between the slurry storage tank 1 and the transfer unit 5. These two filters filter the flowing slurry, removing any slag or other impurities that may be mixed in, maintaining the cleanliness of the entire slurry supply.

[0030] Furthermore, a diaphragm pump 11 is provided between the second filter 10 and the slurry storage tank 1. This diaphragm pump 11 provides the power for slurry transportation and can also control the slurry delivery pressure more precisely, maintaining the stability and uniformity of slurry flow.

[0031] Furthermore, a branch pipe 12 is provided between the coating die head 4 and the large circulation valve 62, which is connected in parallel with the pipes containing the return valve 61 and the coating valve 3. During coating, some excess slurry is returned to the transfer unit 5 through the slurry recovery mechanism 7, and some excess slurry flows through the branch pipe 12 through the small circulation valve 8 and then returns to the transfer unit 5.

[0032] Furthermore, the transfer unit 5 includes a transfer storage tank 51 and a second screw pump 52, which is mainly responsible for the transport and circulation of slurry in the whole system.

[0033] When this invention is in operation, it includes four operating modes: normal coating, cycle 1, cycle 2, and cycle 3. The corresponding slurry transport paths are as follows:

[0034] Please continue reading. Figure 3 When the system is operating under normal coating conditions, the slurry path is as follows: slurry storage tank 1 → diaphragm pump 11 → second filter 10 → transfer unit 5 → second screw pump 52 → first filter 9 → coating die head 4 → coating back roller 2 (current collector). Simultaneously, the following branches also exist:

[0035] Excess slurry (partial): Coating die head 4 → Branch pipeline 12 → Small circulation valve 8 → Transfer unit 5;

[0036] Excess slurry (partial): Coating die head 4 → Recycling port 71 → Recycling storage tank 72 → First screw pump 71 → Recycling valve 74 Transfer unit 5.

[0037] During normal coating, coating valve 3 and small circulation valve 8 are open, and return valve 61 is closed. Slurry storage tank 1 supplies slurry to transfer unit 5 via diaphragm pump 11, and the slurry undergoes a first filtration through second filter 10. Supply stops immediately when the slurry reaches the set liquid level height of the trolley, and resumes supplying when the liquid level falls below the set liquid level height. Transfer unit 5 supplies slurry via second screw pump 52, and the slurry undergoes a second filtration through first filter 9. The slurry after two filtrations enters coating die head 4 and is evenly coated onto the collector of back roller 2 through die lip. Excess slurry flows back to transfer unit 5 through branch pipe 12 and small circulation valve 8, and flows to slurry recovery port 71 through die lip. Slurry in recovery port 71 flows into recovery tank 72. Slurry collected in recovery tank 72 is stirred at low speed by first screw pump 1. When the liquid level in recovery tank 72 reaches the set liquid level height, the recovered slurry is transported to transfer unit 5 by first screw pump 71.

[0038] Please continue reading. Figure 4 When the system is running in cycle 1 mode, the path of the slurry is: transfer unit 5 → second screw pump → first filter 9 → return valve 61 → small circulation valve 8 → transfer unit 5.

[0039] The slurry in transfer unit 5 is pumped from the bottom to filter 1 by the second screw pump 52. After filtration, the slurry returns to transfer unit 5 via return valve 61 and small circulation valve 8. At this time, return valve 61 and small circulation valve 8 are open, while other valves are closed. Circulation path 1 can circulate the slurry in transfer unit 5 and the section of the coating pipe before the die head, and can also return the slurry accumulated in the coating die head 4 to transfer unit 5. This circulation path 1 is suitable for slurry circulation during short shutdowns of the coating machine, keeping the slurry in a flowing state.

[0040] Please continue reading. Figure 5 When the system is running in cycle 2 mode, the path of the slurry is: slurry storage tank 1 → diaphragm pump 11 → second filter 10 → transfer unit 5 → first filter 9 → reflux valve 61 → large circulation valve 62 → slurry storage tank 1.

[0041] The slurry in slurry storage tank 1 is pumped to the second filter 10 by diaphragm pump 11. After filtration, the slurry flows into transfer trolley 51. The slurry in transfer trolley 51 is then pumped from the bottom to the first filter 9 by second screw pump 52. After filtration, the slurry returns directly to slurry storage tank 1 through return valve 61 and large circulation valve 62. At this time, return valve 61 and large circulation valve 62 are open, while other valves are closed. This circulation path 2 is suitable for slurry circulation when the coating machine is shut down for a long time. It quickly replaces the old slurry in transfer trolley 51 with the new slurry in slurry storage tank 1, achieving slurry mixing and circulation.

[0042] Please continue reading. Figure 6 When the system operates in cycle 3 mode, the slurry path is: recovery port 71 → recovery storage tank 72 → first screw pump 73 → recovery valve 74 → transfer unit 5. In transfer unit 5, the recovered slurry is mixed evenly with the original slurry in transfer trolley 51, and then, depending on the system operating status, it is transported to coating die head 4 via second screw pump 52, first filter 9, and other components, or participates in cycle 1 and cycle 2.

[0043] In summary, this utility model, through the above three cyclic processes, can achieve the recycling of coating slurry, which can not only ensure the uniformity and consistency of the slurry, but also realize the recycling and reuse of the slurry, effectively reducing the waste of slurry during the coating process, and improving the product qualification rate and equipment efficiency.

[0044] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0045] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A high-efficiency recycling system for coating slurry, characterized in that, It includes a slurry storage tank (1), a transfer unit (5), a coating valve (3), and a coating die (4) connected in sequence; a return pipeline (6) is provided between the coating valve (3) and the transfer unit (5); the return pipeline (6) includes a return valve (61) and a large circulation valve (62) connected in sequence; the discharge end of the large circulation valve (62) is connected to the slurry storage tank (1).

2. The high-efficiency recycling system for coating slurry according to claim 1, characterized in that, The coating die (4) is provided with a slurry recovery mechanism (7) below it; the discharge end of the slurry recovery mechanism (7) is connected to the transfer unit (5).

3. The high-efficiency recycling system for coating slurry according to claim 2, characterized in that, The slurry recovery mechanism (7) includes a recovery port (71), a recovery storage tank (72), a first screw pump (73), and a recovery valve (74) connected in sequence.

4. The high-efficiency recycling system for coating slurry according to claim 1, characterized in that, The reflux valve (61) is connected to the transfer unit (5) via the small circulation valve (8).

5. The high-efficiency recycling system for coating slurry according to claim 1, characterized in that, A first filter (9) is provided between the transfer unit (5) and the coating valve (3).

6. The high-efficiency recycling system for coating slurry according to claim 1, characterized in that, A second filter (10) is provided between the slurry storage tank (1) and the transfer unit (5).

7. The high-efficiency recycling system for coating slurry according to claim 6, characterized in that, A diaphragm pump (11) is provided between the second filter (10) and the slurry storage tank (1).

8. The high-efficiency recycling system for coating slurry according to claim 1, characterized in that, A branch pipeline (12) is provided between the coating die head (4) and the large circulation valve (62) and is connected in parallel with the pipeline where the return valve (61) and coating valve (3) are located.

9. The high-efficiency recycling system for coating slurry according to claim 1, characterized in that, The transfer unit (5) includes a transfer storage tank (51) and a second screw pump (52).

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