Circulating treatment system for lithium battery coating slurry

Abstract

The utility model discloses a circulating treatment system for lithium battery coating slurry. The circulating treatment system comprises a buffer tank, a filter, an electromagnetic valve, a material conveying pipeline and a material returning pipeline, the buffer tank, the filter and the electromagnetic valve are sequentially connected through a material conveying pipeline, and the electromagnetic valve is connected to the buffer tank through a material returning pipeline; and the material conveying pipeline and the material returning pipeline are switched through an electromagnetic valve, so that slurry is recycled, and internal gas is filtered through a filter. According to the utility model, the electromagnetic valve is arranged at the joint of the material conveying pipeline and the material returning pipeline, and the switching of the pipelines is controlled through the electromagnetic valve, so that the recycling of slurry is realized. Meanwhile, the phenomenon of non-uniform coating caused by coagulation and agglomeration of slurry in a cavity in the die head is prevented, the phenomena of unevenness and wrinkling of a coating surface caused by fusion of gas in the filter and the slurry are prevented, and the service life of the filter is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of circulating treatment of lithium battery coating slurry, in particular to a circulating treatment system of lithium battery coating slurry. Background Art

[0002] Lithium-ion batteries have become a pillar product in the development of the new energy industry due to their advantages such as high energy density, high output power, and long charge and discharge life, and are widely used in various industries.

[0003] The coating process is a key link in the production of lithium-ion batteries. The slurry is processed by various equipment in the coating process and coated on the substrate on the die head.

[0004] The existing coating technology is relatively mature, but there are still many details that need to be improved. For example, the slurry inside the die cavity may agglomerate due to shutdown and other reasons, resulting in uneven subsequent coating. In the slurry processing process, the bladder filter needs to be replaced frequently, which requires a lot of cost. In addition, when replacing the bladder filter, the slurry will mix with the gas inside the bladder filter, causing unevenness or wrinkles at the coating terminal. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art. To achieve the above purpose, a circulation treatment system for lithium battery coating slurry is adopted to solve the problems raised in the above background technology.

[0006] A circulation processing system for lithium battery coating slurry, the circulation processing system comprising a buffer tank, a filter, an electromagnetic valve, a material delivery pipeline, and a material return pipeline;

[0007] The filter and the electromagnetic valve are connected in sequence through a material delivery pipeline, and the electromagnetic valve is connected to the buffer tank through a return pipeline;

[0008] The feed pipeline and the return pipeline are switched by electromagnetic valves to circulate the slurry, and the internal gas is filtered through the filter.

[0009] As a further solution of the utility model: the circulation treatment system also includes a stirring tank, a degassing tank, an iron remover, a scraper filter, and a die head;

[0010] The buffer tank comprises a tank body, a feed inlet, a discharge outlet, a return outlet, a stirring device, a stirring motor, and an infrared depth detection device;

[0011] The tank body is installed on a bracket, the feed port is located at the top of the tank body, the discharge port is located at the bottom side of the tank body, the return port is located at the upper end of the side, the stirring device is located inside the tank body, the stirring motor is located at the upper end of the cover plate of the tank body, and is used to stir the internal slurry of the tank body, and the infrared depth detection device is located around the stirring motor and is used to detect the depth of the liquid inside the tank body.

[0012] As a further solution of the utility model: one end of the return pipe is connected to the feed pipe between the filter and the die head and close to one side of the die head to form a T-shaped pipeline, and the other end of the return pipe is connected to the return port of the buffer tank and connected to the buffer tank.

[0013] As a further solution of the utility model: the filter includes a shell, an inner cavity, an outer cavity, a filter element, a feed channel, a discharge channel, an exhaust channel, a waste buffer area, a waste discharge channel, a valve, and an exhaust valve.

[0014] As a further solution of the utility model: the inner cavity is composed of a filter element and a cavity surrounded by a shell on the upper surface of the filter;

[0015] The outer cavity is composed of a cavity between the shell and the filter element.

[0016] As a further solution of the utility model: the feed channel is located at the bottom center of the filter, and the discharge channel is located at the top center of the filter.

[0017] As a further solution of the utility model: the exhaust channels are located at both ends of the discharge channel and are arranged symmetrically, and the exhaust channels control the inlet and outlet of gas and slurry through exhaust valves.

[0018] As a further solution of the utility model: the waste buffer area is located on both sides of the feed channel, is symmetrically distributed, and has a capsule-shaped structure at the bottom.

[0019] As a further solution of the utility model: the waste discharge channel is located at the bottom end of the waste buffer area and communicates with the waste buffer area, and the waste discharge channel includes a waste discharge valve, a waste discharge metal pipe, and a screw cover.

[0020] As a further solution of the utility model: the valve is located at the junction of the discharge channel and the bottleneck of the filter and on the side wall different from the exhaust channel.

[0021] Compared with the prior art, the utility model has the following technical effects:

[0022] The above technical solution is adopted, by connecting one end of the return pipe to the feed pipe between the filter and the die head and close to the die head side, forming a T-shaped pipeline, and the other end is connected to the return port of the buffer tank, leading to the buffer tank, and the slurry is controlled by the solenoid valve to flow back to the buffer tank for processing, so as to realize the recycling of the slurry and prevent the uneven coating caused by the condensation and agglomeration of the slurry in the internal cavity of the die head. The filter used can quickly remove the gas inside the filter after replacing the filter element or discharging the waste material in the filter element buffer area, preventing the gas in the filter from merging with the slurry, resulting in unevenness and wrinkling on the coating surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The specific implementation of the utility model is described in detail below in conjunction with the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the overall structure of the circulation treatment system of the embodiment disclosed in this application;

[0025] Figure 2 This is a schematic diagram of the structure of the cache tank of the embodiment disclosed in this application;

[0026] Figure 3 A schematic diagram of the structure of the Nas filter according to the embodiment disclosed in the present application;

[0027] Figure 4 It is a cross-sectional schematic diagram of the waste discharge channel of the embodiment disclosed in the present application.

[0028] In the figure: 1, stirring tank; 2, degassing tank; 3, iron remover; 4, scraper filter; 5, buffer tank; 51, tank body; 52, feed port; 53, discharge port; 54, return port; 55, stirring device; 56, stirring motor; 57, infrared depth detection device; 6, filter; 6a, shell; 6b, inner cavity; 6c, outer cavity; 6d, filter element; 6e, feed channel; 6f, discharge channel; 6g, exhaust channel; 6h, waste buffer area; 6i, waste discharge channel; 6i1, waste discharge valve; 6i2, waste discharge metal pipe; 6i3, screw cover; 6j, valve; 6k, exhaust valve; 7, electromagnetic valve; 8, die head; 9, feed pipeline; 10, return pipeline. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Please refer to Figure 1In an embodiment of the utility model, a circulation processing system for lithium battery coating slurry includes: a stirring tank 1, a degassing tank 2, an iron remover 3, a scraper filter 4, a buffer tank 5, a filter 6, an electromagnetic valve 7, a die head 8, a feed pipeline 9 and a return pipeline 10.

[0031] The slurry flows through the mixing tank 1, the degassing tank 2, the iron remover 3 and the scraper filter 4 in sequence through the feed pipeline, and flows into the buffer tank 5 from the feed inlet 52 after preliminary treatment.

[0032] In this embodiment, if Figure 2 As shown, the figure is a schematic diagram of the structure of the cache tank; the cache tank 5 includes a tank body 51, which is installed on a bracket, and a feed inlet 52 is provided on the top of the tank body, a discharge port 53 is provided on the bottom side, a return port 54 is provided on the upper end of the side, a stirring device 55 is provided inside, and a stirring motor 56 and an infrared depth detection device 57 are provided on the cover plate of the tank body.

[0033] The slurry is initially accumulated in the buffer tank 5. The capacity of the buffer tank 5 is monitored by the infrared depth detection device 57, and the data is reflected in the upper computer. At the same time, in order to prevent the slurry from agglomerating and condensing in the buffer tank 5, the upper computer controls the stirring motor 56 above the buffer tank 5 to drive the stirring device 55 to stir. When the slurry capacity in the buffer tank 5 reaches a certain volume, the upper computer opens the electromagnetic valve 7, and the slurry flows into the die head 8 for coating after being filtered through the feed pipe 9 and the filter 6. The electromagnetic valve 7 is located at the junction of the feed pipe 9 and the return pipe 10, and is used to control the switching of the feed pipe 9 and the return pipe 10. One end of the return pipe 10 is connected to the feed pipe 9 between the filter 6 and the die head 8 and is close to the die head 8 to form a T-shaped pipeline. The other end is connected to the return port 54 of the buffer tank 5, leading to the buffer tank 5. When the equipment is shut down, the upper computer is controlled to switch the electromagnetic valve 7 from the feed pipe 9 to the return pipe 10, and the slurry in the die head 8 is recovered to the buffer tank 5 for processing, so as to realize the recycling of the slurry. At the same time, after the equipment is restarted, it can effectively prevent the uneven coating caused by the condensation and agglomeration of the slurry in the internal cavity of the die head 8.

[0034] In this embodiment, if Figure 3As shown, the diagram is a schematic diagram of the structure of the capsule filter; the filter 6 includes a shell 6a, an inner cavity 6b, an outer cavity 6c, a filter element 6d, a feed channel 6e, a discharge channel 6f, an exhaust channel 6g, a waste buffer area 6h, a waste discharge channel 6i and a valve 6j. The inner cavity 6b is composed of an internal space surrounded by the filter element 6d and the shell 6a on the upper surface of the filter 6. The outer cavity 6c is composed of a cavity between the shell 6a and the filter element 6d. The filter element 6d has cylindrical walls on both sides and a circular arc bottom at the bottom. The feed channel 6e is located at the bottom center of the filter 6. The discharge channel 6f is located at the top center of the filter 6. The exhaust channel 6g is located at both ends of the discharge channel 6f and is symmetrically arranged. The exhaust channel 6g controls the inflow and outflow of gas and slurry through the exhaust valve 6k. The waste buffer area 6h is located on both sides of the feed channel 6e, symmetrically distributed, and the bottom is in the shape of a long arc. The waste discharge channel 6i is located at the bottom of the waste buffer area 6h and communicates with the waste buffer area 6h. The waste discharge channel 6i includes a waste discharge valve 6i1, a waste discharge metal pipe 6i2 and a screw cover 6i3. The valve 6j is located at the junction of the discharge channel 6f and the bottleneck of the filter 6 and on the side of the side wall exhaust channel 6g.

[0035] In this embodiment, when the filter element 6d of the filter 6 is blocked, a new filter 6 is replaced, the valve 6j of the filter 6 is closed, the screw cap 6i4 is tightened, the exhaust channel 6g is opened, and the slurry flows into the outer cavity 6c through the feed channel 6e, gradually overflowing the waste buffer area 6h. As the liquid level rises, the slurry passes through the filter element 6d to filter out the slurry with larger particles, and then flows into the inner cavity 6b of the filter 6, and finally fills the filter 6, and the gas in the filter 6 is quickly discharged through the exhaust channel 6g. When the slurry overflows from the exhaust channel 6g, the gas inside the filter 6 is completely emptied, the exhaust valve 6g2 of the filter 6 is closed, and the valve 6j is opened. The slurry in the inner cavity 6b flows out from the discharge channel 6f. The gas in the filter 6 can be quickly and effectively discharged through the filter 6, preventing the gas inside the filter 6 from mixing in the slurry, causing unevenness and wrinkling on the coating surface.

[0036] In this embodiment, Figure 4 As shown, the figure is a cross-sectional schematic diagram of the waste discharge channel; during the use of the filter 6, large particles of slurry will be filtered out, and at the same time, under the action of gravity, they will flow to the waste buffer area 6h for precipitation. After a period of time, the small liquid valve 6i1 and the screw cover 6i3 of the waste discharge channel 6i can be opened to discharge waste through the waste discharge metal pipe 6i2. After the waste discharge of the waste discharge metal pipe 6i2 is completed, the small liquid valve 6i1 is closed and the screw cover 6i3 is tightened, which can effectively prevent the slurry from flowing out due to the loosening of the liquid valve. According to the above-mentioned slurry treatment process of the bladder filter 6, the slurry treatment is re-performed to achieve repeated use of the filter 6 and increase the service life of the filter.

[0037] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0038] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A circulation treatment system for lithium battery coating slurry, characterized in that: The circulation treatment system comprises a buffer tank (5), a filter (6), an electromagnetic valve (7), a material delivery pipeline (9), and a material return pipeline (10); The filter (6) and the electromagnetic valve (7) are connected in sequence through a material delivery pipeline (9), and the electromagnetic valve (7) is connected to the buffer tank (5) through a return pipeline (10); The feed pipe (9) and the return pipe (10) are switched by the electromagnetic valve (7) to circulate the slurry, and the internal gas is filtered by the filter (6); One end of the return pipe (10) is connected to the feed pipe (9) between the filter (6) and the die head (8) and is close to one side of the die head (8) to form a T-shaped pipeline. The other end of the return pipe (10) is connected to the return port (54) of the buffer tank (5) and is connected to the buffer tank (5).

2. A lithium battery coating slurry circulation treatment system according to claim 1, characterized in that: The circulation treatment system also includes a stirring tank (1), a degassing tank (2), an iron remover (3), a scraper filter (4), and a die head (8); The buffer tank (5) comprises a tank body (51), a feed port (52), a discharge port (53), a return port (54), a stirring device (55), a stirring motor (56), and an infrared depth detection device (57); The tank body (51) is mounted on a bracket, the feed port (52) is located at the top of the tank body (51), the discharge port (53) is located at the bottom side of the tank body (51), the return port (54) is located at the upper end of the side, the stirring device (55) is located inside the tank body (51), the stirring motor (56) is located at the upper end of the cover plate of the tank body, and is used to stir the internal slurry of the tank body (51), and the infrared depth detection device (57) is located around the stirring motor (56) and is used to detect the depth of the liquid inside the tank body.

3. A lithium battery coating slurry circulation treatment system according to claim 1, characterized in that: The filter (6) comprises a shell (6a), an inner cavity (6b), an outer cavity (6c), a filter element (6d), a feed channel (6e), a discharge channel (6f), an exhaust channel (6g), a waste buffer area (6h), a waste discharge channel (6i), a valve (6j), and an exhaust valve (6k).

4. A lithium battery coating slurry circulation treatment system according to claim 3, characterized in that: The inner cavity (6b) is composed of a filter element (6d) and a cavity surrounded by a housing (6a) on the upper surface of the filter (6); The outer cavity (6c) is composed of a cavity between the housing (6a) and the filter element (6d).

5. A lithium battery coating slurry circulation treatment system according to claim 3, characterized in that: The feed channel (6e) is located at the bottom center of the filter (6), and the discharge channel (6f) is located at the top center of the filter (6).

6. A lithium battery coating slurry circulation treatment system according to claim 3, characterized in that: The exhaust channels (6g) are located at both ends of the discharge channel (6f) and are arranged symmetrically, and the exhaust channels (6g) control the inflow and outflow of gas and slurry through the exhaust valve (6k).

7. A lithium battery coating slurry circulation treatment system according to claim 3, characterized in that: The waste buffer area (6h) is located on both sides of the feed channel (6e), is symmetrically distributed, and has a capsule-shaped structure at the bottom.

8. A lithium battery coating slurry circulation treatment system according to claim 3, characterized in that: The waste discharge channel (6i) is located at the bottom end of the waste buffer area (6h) and communicates with the waste buffer area (6h). The waste discharge channel (6i) comprises a waste discharge valve (6i1), a waste discharge metal pipe (6i2), and a screw cover (6i3).

9. A lithium battery coating slurry circulation treatment system according to claim 3, characterized in that: The valve (6j) is located at the junction of the discharge channel (6f) and the bottleneck of the filter (6) and on the side of the side wall different from the exhaust channel (6g).

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