Gravity filtering device for battery coating slurry

Abstract

The utility model discloses a gravity filtering device for battery coating slurry, which is used for filtering after a diaphragm pump pumps the slurry and comprises a gravity hopper and a filter, and the gravity hopper is provided with a feed storage cavity and a discharge transition cavity which are communicated with each other; wherein the discharging transition cavity is of a truncated cone structure with a large upper part and a small lower part; a feeding port is formed in the top of the feeding waiting cavity, and a discharging port is formed in the bottom of the discharging transition cavity; a feed port of the feed storage cavity is hermetically connected with a pumping outlet pipeline of the diaphragm pump; the filter comprises a filter shell and a filter element; wherein the filter shell is of a hollow structure, a filtering cavity channel is formed in the hollow structure, a feeding connector communicated with the filtering cavity channel is formed in the top of the hollow structure, and a discharging connector communicated with the filtering cavity channel is formed in the bottom of the hollow structure. The filter element can effectively filter colloidal particles in slurry and prevent the colloidal particles from being extruded to penetrate through the filter element, so that the problem of scratches on the surface of a coating is remarkably reduced.

Description

Technical Field

[0001] The utility model relates to a gravity filtration device for battery coating slurry, belonging to the technical field of battery manufacturing. Background Art

[0002] At present, the lithium battery coating process is an important link in the lithium battery manufacturing process, mainly involving a process of uniformly coating the stirred slurry on the current collector and drying the organic solvent in the slurry. The coating effect has an important impact on the battery capacity, internal resistance, cycle life and safety.

[0003] Common defects in the coating process mainly include bubbles, pinholes, scratches, drum edges, cracks, wrinkles, etc. With wet mixing, there are undispersed glue blocks in the slurry, and it is easy to produce glue particle scratches on the surface of the electrode during the coating process, affecting the product qualification rate. The glue particle scratches on the positive electrode have a certain impact on the capacity and cycle performance, while the glue particle scratches on the negative electrode are more likely to bring potential safety hazards.

[0004] In the existing coating system, the slurry is mainly pumped into the feeding trolley by a diaphragm pump, and then the slurry in the feeding trolley is supplied to the die head for coating by a screw pump. Although there are multiple layers of filtration in the whole feeding system, due to the extrusion force during the pumping process, the glue particles in the slurry are easily extruded through the filter element, forming glue particle scratches on the coating surface.

[0005] After retrieving the existing technology, it is found that the Chinese patent with the publication number CN215823530U discloses a slurry feeding pipeline for the battery coating process. A buffer tank is provided in the pipeline in this patent. However, it is found in actual use that when dealing with a large amount of slurry, it is not very convenient to place the buffer tank in the pipeline. Summary of the Invention

[0006] The technical problem to be solved by the utility model is to overcome the defects of the existing technology and provide a gravity filtration device for battery coating slurry, which can effectively filter the glue particles in the slurry, avoid the glue particles being extruded through the filter element, and thus significantly reduce the scratch problem on the coating surface.

[0007] To solve the above technical problem, the technical solution of the utility model is: a gravity filtration device for battery coating slurry, used for filtration after the diaphragm pump pumps the material, including:

[0008] A gravity hopper, which is provided with a feed storage cavity and a discharge transition cavity that are connected and communicated;

[0009] Among them, the discharge transition cavity has a truncated cone structure with a large top and a small bottom;

[0010] The top of the feed storage cavity is provided with a feed inlet, and the bottom of the discharge transition cavity is provided with a discharge outlet;

[0011] The feed inlet of the feed storage chamber is hermetically connected to the material suction outlet pipe of the diaphragm pump;

[0012] A filter, the filter includes a filter housing and a filter element;

[0013] Wherein, the filter housing is a hollow structure, a filter chamber is arranged in the hollow structure, a feed interface communicating with the filter chamber is arranged at the top of the hollow structure, and a discharge interface communicating with the filter chamber is arranged at the bottom of the hollow structure;

[0014] The filter element is detachably installed in the filter chamber, and the feed interface of the filter housing is communicated with the discharge port of the discharge transition chamber of the gravity hopper.

[0015] Furthermore, for the convenience of connection, a connecting flange is arranged at the discharge port of the discharge transition chamber of the gravity hopper;

[0016] A mating flange matching the connecting flange is arranged at the feed interface of the filter housing;

[0017] The connecting flange and the mating flange are adapted to be connected by a bolt assembly.

[0018] Furthermore, for the convenience of controlling the stop valve, the gravity filtration device for battery coating slurry further includes a stop valve, and the stop valve is installed on the discharge interface of the filter.

[0019] Furthermore, a specific range of the mesh number of the filter element is provided, and the mesh number of the filter element of the filter is between 140 meshes and 160 meshes.

[0020] Furthermore, a specific structure of automatic feeding is provided, and the gravity filtration device for battery coating slurry further includes a controller and a liquid level sensor, wherein:

[0021] The liquid level sensor is installed on the top of the gravity hopper, the liquid level sensor is provided with a sensing end, and the sensing end is adapted to sense the liquid level heights of the feed storage chamber and the discharge transition chamber and send out liquid level height signals;

[0022] The controller is arranged outside the gravity hopper, and the controller is electrically connected to the diaphragm pump and the liquid level sensor respectively;

[0023] The controller is adapted to receive the liquid level height signal of the liquid level sensor and control the start and stop of the diaphragm pump through the liquid level height signal.

[0024] Furthermore, a specific type of the liquid level sensor is provided, and the liquid level sensor is an ultrasonic sensor.

[0025] Further, the gravity filtration device for battery coating slurry further includes a feed buffer channel, which is in a spiral structure and is fixedly arranged on the inner wall of the feed storage cavity of the gravity hopper;

[0026] The feed buffer channel includes a starting end disposed at the feed inlet and a terminating end extending to the bottom of the feed storage cavity.

[0027] Further, the cross-section of the feed buffer channel is arc-shaped.

[0028] Further, the gravity filtration device for battery coating slurry further includes a rinsing device, which includes:

[0029] A rotary joint, which has a fixed end and a rotating end. The fixed end is installed at the middle position of the top of the gravity hopper and extends out of the gravity hopper. The fixed end is adapted to connect to a high-pressure liquid source, and the rotating end is arranged inside the gravity hopper;

[0030] A conveying extension pipe, one end of which is connected to the rotating end of the rotary joint, and the other end is a closed end, which extends downward inside the gravity hopper;

[0031] A plurality of spray rings, which are arranged at intervals along the axial direction of the conveying extension pipe on the conveying extension pipe.

[0032] Further, a plurality of spray outlets are evenly arranged on the outer circumference of the spray ring;

[0033] The high-pressure liquid inside the spray ring is adapted to drive the rotation of the conveying extension pipe and the spray ring through the spray outlets.

[0034] By adopting the above technical solutions, the utility model has the following beneficial effects:

[0035] In the utility model, firstly, the slurry is pumped into the feed inlet of the gravity hopper through a diaphragm pump and enters the feed storage cavity. Then the slurry slides into the discharge transition cavity, from the truncated cone structure with a large upper part and a small lower part to the discharge port, and enters the filter. The slurry naturally passes through the filter element and finally flows out from the discharge interface, avoiding the extrusion of the slurry during the pumping process. In this way, the rubber particles in the slurry will not pass through the filter element due to extrusion, thereby significantly reducing the appearance of scratches on the coating surface and improving the coating quality.

[0036] Secondly, by setting up the connecting flange and the mating flange, the detachable connection between the gravity hopper and the filter is realized, and the sealing performance is ensured at the same time. By installing a stop valve at the discharge interface of the filter, the flow of the slurry can be conveniently controlled, further improving the operational convenience. The combined use of the liquid level sensor and the controller enables the automatic control of the start and stop of the diaphragm pump according to the liquid level height of the slurry, ensuring the efficient operation of the system. By setting up an inlet buffer channel in the inlet storage chamber, the impact of the slurry during the feeding process is effectively reduced, further improving the filtering effect.

[0037] In summary, the patent of the present utility model effectively filters the colloidal particles in the slurry, significantly reducing the scratches on the coating surface caused by the colloidal particles in the slurry and ensuring the coating quality. Brief Description of the Drawings

[0038] Figure 1 It is a schematic three-dimensional structure diagram of Embodiment 2 of the gravity filtration device for battery coating slurry of the present utility model;

[0039] Figure 2 It is a schematic structure diagram of Embodiment 1 of the gravity filtration device for battery coating slurry of the present utility model;

[0040] Figure 3 It is a schematic structure diagram of Embodiment 3 of the gravity filtration device for battery coating slurry of the present utility model. Detailed Description of the Embodiments

[0041] In order to make the content of the present utility model easier to be clearly understood, the present utility model will be further described in detail below according to specific embodiments in conjunction with the drawings.

[0042] Embodiment 1

[0043] As Figures 1-3 shown, a gravity filtration device for battery coating slurry, which is used for filtration after the diaphragm pump pumps the material, includes:

[0044] A gravity hopper 1, the gravity hopper 1 is provided with a connected inlet storage chamber 11 and a discharge transition chamber 12;

[0045] Among them, the discharge transition chamber 12 has a frustum-shaped structure with a large top and a small bottom;

[0046] The top of the inlet storage chamber 11 is provided with an inlet 111, and the bottom of the discharge transition chamber 12 is provided with a discharge port;

[0047] The inlet 111 of the inlet storage chamber 11 is sealed and connected to the material pumping outlet pipeline of the diaphragm pump;

[0048] A filter 2, the filter 2 includes a filter housing 21 and a filter element 22;

[0049] Among them, the filter housing 21 is a hollow structure. A filter chamber is provided inside the hollow structure. A feed interface communicating with the filter chamber is provided at the top of the hollow structure, and a discharge interface 212 communicating with the filter chamber is provided at the bottom of the hollow structure;

[0050] The filter element 22 is detachably installed in the filter chamber. The feed interface of the filter housing 21 communicates with the discharge port of the discharge transition chamber 12 of the gravity hopper 1.

[0051] In this embodiment, as Figures 1-2 shown, first, the slurry is pumped into the feed port 111 of the gravity hopper 1 through a diaphragm pump, enters the feed storage chamber 11, then the slurry slides down to the discharge transition chamber 12, from the upper large and lower small truncated cone structure to the discharge port, enters the filter 2, the slurry naturally passes through the filter element 22, and finally flows out from the discharge interface 212, avoiding the extrusion of the slurry during the pumping process. In this way, the rubber particles in the slurry will not pass through the filter element 22 due to extrusion, thereby significantly reducing the appearance of scratches on the coating surface and improving the coating quality.

[0052] The truncated cone structure of the discharge transition chamber 12 can facilitate the natural flow of the slurry. An observation window is also provided on the filter housing 21 to facilitate monitoring the state of the filter element 22;

[0053] Specifically, as Figures 1-2 shown, a connecting flange is provided at the discharge port of the discharge transition chamber 12 of the gravity hopper 1;

[0054] The feed interface of the filter housing 21 is provided with a mating flange matching the connecting flange 122;

[0055] The connecting flange and the mating flange are adapted to be connected by a bolt assembly.

[0056] In this embodiment, as Figures 1-2 shown, the main functions of the connecting flange and the mating flange are to ensure the stable connection and sealing performance between the gravity hopper 1 and the filter 2. By using the combination of the connecting flange and the mating flange, rapid and reliable installation and disassembly can be achieved, while ensuring that the slurry does not leak during transmission. The specific use process is as follows: First, align the connecting flange on the discharge port of the discharge transition chamber 12 of the gravity hopper 1 with the mating flange on the feed interface of the filter housing 21. Then, use a bolt assembly to tightly connect the two connecting flanges and the mating flange. During installation, an appropriate sealing gasket can be added between the connecting flange and the mating flange to further enhance the sealing effect. Regularly check and properly tighten the bolts to ensure the stability of long-term use.

[0057] Specifically, as Figures 1-2 shown, the gravity filtration device for battery coating slurry further includes a stop valve (not shown in the figure), and the stop valve is installed on the discharge interface 212 of the filter 2.

[0058] In this embodiment, the globe valve is mainly provided to control the output flow rate and time of the filtered slurry, which can effectively regulate the filtration process and completely block the flow of the slurry when needed, facilitating the maintenance and cleaning of the equipment.

[0059] During use, the operator can adjust the opening degree of the globe valve according to actual needs. For example, at the beginning of filtration, the globe valve can be slightly opened first to allow air and possible impurities to be discharged first; then the opening degree can be gradually increased to achieve the ideal flow rate. When the filter element needs to be replaced or the equipment needs to be cleaned, the globe valve can be completely closed to ensure safe operation.

[0060] Specifically, as Figures 1-2 shown, the mesh number of the filter element 22 of the filter 2 is 150 meshes.

[0061] In this embodiment, as Figures 1-2 shown, this mesh number of 150 meshes can effectively remove most of the impurities and particles in the battery coating slurry, and at the same time will not overly reduce the fluidity of the slurry. This selection is beneficial to improving the battery coating quality and reducing battery performance problems caused by impurities.

[0062] During use, the slurry passes through the filter element 22, and larger impurities are intercepted outside the filter element, while the qualified slurry passes through smoothly. As the use time increases, impurities will gradually accumulate on the surface of the filter element 22, and it is necessary to clean or replace it regularly to maintain the filtration efficiency.

[0063] Of course, the mesh number range of the filter element 22 of the filter 2 can be between 140 meshes and 160 meshes.

[0064] Specifically, as Figures 1-2 shown, the gravity filtration device for battery coating slurry further includes a controller and a liquid level sensor 3, where:

[0065] The liquid level sensor 3 is installed on the top of the gravity hopper 1. The liquid level sensor 3 is provided with a sensing end, and the sensing end is adapted to sense the liquid level heights of the feed storage chamber 11 and the discharge transition chamber 12 and send out liquid level height signals;

[0066] The controller is arranged outside the gravity hopper 1, and the controller is electrically connected to the diaphragm pump and the liquid level sensor respectively;

[0067] The controller is adapted to receive the liquid level height signal of the liquid level sensor 3 and control the start and stop of the diaphragm pump according to the liquid level height signal.

[0068] In this embodiment, as Figures 1-2As shown, the controller and the liquid level sensor 3 are mainly used to realize the automatic control of the battery coating slurry filtration process, improve production efficiency and safety, and prevent overflow or idling. The operation process is as follows: The liquid level sensor 3 continuously monitors the slurry liquid level height in the feeding storage chamber 11 and the discharging transition chamber 12, and transmits the liquid level height signal to the controller. The controller automatically controls the start and stop of the diaphragm pump according to the preset liquid level range. When the liquid level is lower than the set lower limit, the controller starts the diaphragm pump for feeding; when the liquid level reaches the set upper limit, the controller controls the diaphragm pump to stop to prevent overflow.

[0069] Specifically, as Figures 1-2 shown, the liquid level sensor 3 is an ultrasonic sensor.

[0070] Of course, in some embodiments, the liquid level sensor 3 can also be other non-contact liquid level sensors.

[0071] Embodiment 2

[0072] This embodiment is basically the same as Embodiment 1, the difference is that:

[0073] Specifically, as Figures 1-2 shown, the gravity filtration device for battery coating slurry further includes a feeding buffer channel 4. The feeding buffer channel 4 has a spiral structure and is fixedly arranged on the inner wall of the feeding storage chamber 11 of the gravity hopper 1;

[0074] The feeding buffer channel 4 includes a starting end arranged at the feeding port 111 and a terminating end extending to the bottom of the feeding storage chamber 11.

[0075] Specifically, as Figures 1-2 shown, the cross-section of the feeding buffer channel 4 is arc-shaped.

[0076] In this embodiment, as Figures 1-2 shown, the main purpose of the design of the feeding buffer channel 4 is to alleviate the problem of the slurry directly impacting the bottom of the feeding storage chamber 11, and at the same time provide a smoother flow path. The design of the spiral structure and the arc-shaped cross-section can effectively reduce the turbulence and bubble generation of the slurry during the conveying process, and improve the uniformity and stability of the slurry. During use, the slurry enters from the feeding port 111 and slowly descends along the spiral feeding buffer channel 4. During this process, the speed of the slurry gradually slows down and the energy is effectively dispersed. When the slurry reaches the bottom of the feeding storage chamber 11, it is already in a relatively stable state, which is beneficial to the subsequent natural filtration process. The arc-shaped cross-section design further optimizes the flow characteristics of the slurry. This shape can reduce the friction between the slurry and the channel wall surface, and reduce the loss of the slurry during the conveying process. At the same time, the arc shape is also convenient for cleaning and maintenance, reducing the risk of slurry residue and blockage.

[0077] Embodiment 3

[0078] This embodiment is basically the same as Embodiment 1, with the differences being:

[0079] Specifically, as Figure 1 and Figure 3 shown, the gravity filtration device for battery coating slurry further includes a flushing device, and the flushing device can have the following structure, including:

[0080] A rotary joint 51, the rotary joint 51 is provided with a fixed end and a rotating end. The fixed end is installed at the middle position on the top of the gravity hopper 1 and extends out of the gravity hopper 1. The fixed end is adapted to connect to a high-pressure liquid source, and the rotating end is arranged inside the gravity hopper 1;

[0081] A conveying extension pipe 52, one end of the conveying extension pipe 52 is connected to the rotating end of the rotary joint 51, and the other end is a closed end, and the closed end extends downward inside the gravity hopper 1;

[0082] A plurality of spray rings 53, the spray rings 53 are arranged at intervals along the axial direction of the conveying extension pipe 52 on the conveying extension pipe 52.

[0083] Specifically, as Figure 1 and Figure 3 shown, a plurality of spray outlets are evenly arranged on the circumferential outer edge of the spray ring 53;

[0084] The high-pressure liquid inside the spray ring 53 is adapted to drive the conveying extension pipe 52 and the spray ring 53 to rotate through the spray outlets.

[0085] In this embodiment, as Figures 1-2 shown, the design of the flushing device is mainly used to clean the gravity hopper 1 after the filtration. The rotary flushing device can achieve all-round and high-efficiency cleaning. The usage process is as follows: First, connect the high-pressure liquid source to the fixed end of the rotary joint 51. When the high-pressure liquid source is started, the liquid enters the plurality of spray rings 53 through the conveying extension pipe 52. The spray outlets on the spray rings 53 spray the high-pressure liquid onto the inner wall of the gravity hopper 1, and at the same time, the jet force drives the conveying extension pipe 52 and the spray rings 53 to rotate, achieving 360-degree all-round cleaning. The spray rings 53 are evenly distributed with a plurality of spray outlets on the circumferential outer edge. Ensure that the cleaning liquid can evenly cover the inner wall of the gravity hopper 1. The reaction force of the high-pressure liquid at the spray outlets can not only clean the inner wall, but also drive the overall rotation, increasing the cleaning coverage and effect.

[0086] The specific embodiments described above further elaborate on the technical problems solved, technical solutions, and beneficial effects of the present utility model. It should be understood that the above description is only for the specific embodiments of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A gravity filtration device for a battery coating slurry, which is used for filtration after the diaphragm pump pumps the material, and is characterized in that, Comprising: A gravity hopper (1), the gravity hopper (1) being provided with a feed storage cavity (11) and a discharge transition cavity (12) that are connected and communicate with each other; Wherein, the discharge transition cavity (12) has a truncated conical structure with a larger upper part and a smaller lower part; The top of the feed storage cavity (11) is provided with a feed inlet (111), and the bottom of the discharge transition cavity (12) is provided with a discharge outlet; The feed inlet (111) of the feed storage cavity (11) is hermetically connected to the pumping outlet pipeline of the diaphragm pump; A filter (2), the filter (2) including a filter housing (21) and a filter element (22); Wherein, the filter housing (21) has a hollow structure, a filter chamber is provided in the hollow structure, a feed interface communicating with the filter chamber is provided at the top of the hollow structure, and a discharge interface (212) communicating with the filter chamber is provided at the bottom of the hollow structure; The filter element (22) is detachably installed in the filter chamber, and the feed interface of the filter housing (21) is communicated with the discharge outlet of the discharge transition cavity (12) of the gravity hopper (1).

2. The gravity filtration device for battery coating slurry according to claim 1, characterized in that The mesh number of the filter element (22) of the filter (2) is between 140 mesh and 160 mesh.

3. The gravity filtration device for battery coating slurry according to claim 1, characterized in that It further includes a controller and a liquid level sensor (3), wherein: The liquid level sensor (3) is installed on the top of the gravity hopper (1), the liquid level sensor (3) is provided with a sensing end, and the sensing end is adapted to sense the liquid level heights of the feed storage cavity (11) and the discharge transition cavity (12) and send out liquid level height signals; The controller is arranged outside the gravity hopper (1), and the controller is electrically connected to the diaphragm pump and the liquid level sensor respectively; The controller is adapted to receive the liquid level height signal of the liquid level sensor (3) and control the start and stop of the diaphragm pump according to the liquid level height signal.

4. The gravity filtration device for battery coating slurry according to claim 3, characterized in that The liquid level sensor (3) is an ultrasonic sensor.

5. The gravity filtration device for battery coating slurry according to claim 1, characterized in that The discharge outlet of the discharge transition cavity (12) of the gravity hopper (1) is provided with a connecting flange; The feed interface of the filter housing (21) is provided with a mating flange that matches the connecting flange (122); The connecting flange and the mating flange are adapted to be connected by a bolt assembly.

6. The gravity filtration device for battery coating slurry according to claim 1, characterized in that It further includes a stop valve, and the stop valve is installed on the discharge interface (212) of the filter (2).

7. The gravity filtration device for battery coating slurry according to claim 1, characterized in that It further includes a feed buffer channel (4), the feed buffer channel (4) has a spiral structure, and the feed buffer channel (4) is fixedly arranged on the inner wall of the feed storage cavity (11) of the gravity hopper (1); The feed buffer channel (4) includes a starting end disposed at the feed inlet (111) and a terminating end extending to the bottom of the feed storage cavity (11).

8. The gravity filtration device for battery coating slurry according to claim 1, wherein the cross-section of the feed buffer channel (4) is arc-shaped.

9. The gravity filtration device for battery coating slurry according to claim 1, wherein it further includes a flushing device, and the flushing device includes: a rotary joint (51), the rotary joint (51) is provided with a fixed end and a rotating end, the fixed end is installed at the middle position of the top of the gravity hopper (1) and extends out of the gravity hopper (1), the fixed end is adapted to connect to a high-pressure liquid source, and the rotating end is disposed inside the gravity hopper (1); a conveying extension pipe (52), one end of the conveying extension pipe (52) is connected to the rotating end of the rotary joint (51), and the other end is a closed end, and the closed end extends downward inside the gravity hopper (1); a plurality of spray rings (53), the spray rings (53) are arranged at intervals along the axial direction of the conveying extension pipe (52) on the conveying extension pipe (52).

10. The gravity filtration device for battery coating slurry according to claim 9, wherein a plurality of spray outlets are evenly arranged on the outer circumference of the spray ring (53); the high-pressure liquid inside the spray ring (53) is adapted to drive the conveying extension pipe (52) and the spray ring (53) to rotate through the spray outlets.

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