Lithium battery slurry filtering and recycling system

Abstract

The utility model discloses a system for filtering and recycling lithium battery slurry. The system comprises a stirring device, the filtering device is provided with a feeding port and a recycling port, the feeding port of the filtering device is communicated with the stirring device through a feeding pipeline, and the stirring device is connected with the recycling port of the filtering device through a recycling assembly; and the slurry heater is mounted on the recovery assembly, so that the problem that the active viscosity of slurry reprepared by an existing coating slurry recovery device is reduced or is lost is solved.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a system for filtering and recycling lithium battery slurry. Background Art

[0002] At present, the commonly used slurry for lithium battery diaphragm coating is mainly made of alumina or boehmite as raw materials, and is prepared by adding auxiliary additives such as solvents, dispersants, adhesives, etc. The solid content of the slurry is generally between 40-50%, and the amount of auxiliary additives used is mainly adhesives. The adhesives are mainly emulsion polymers such as acrylic emulsions, styrene-butadiene emulsions, and styrene-acrylic emulsions. Slurry waste will be generated in the slurry production process and the diaphragm coating process. In addition to some organic additives, the waste is a water-based system and contains a large amount of alumina or boehmite raw materials. Due to the stability of the slurry, if the raw materials are not recycled, it will not only cause waste of resources, but also pollute the environment.

[0003] In response to the above-mentioned problems of resource waste and environmental pollution, the authorization announcement number CN209735962U published on December 6, 2019, discloses a slurry recovery device for lithium battery diaphragm coating, which includes a demulsifier box and a filter recovery box, which are connected by a conveying pipeline, and a downwardly extending agitator is provided in the middle of the top of the demulsifier box, and a conveying pipeline is connected to the filter recovery box on the side wall of the demulsifier box. A primary filter screen and a secondary filter screen that are movably connected are arranged in sequence from top to bottom in the cavity of the filter recovery box, a primary filter screen outlet and a secondary filter screen outlet that correspond to the primary filter screen and the secondary filter screen respectively are arranged on the side wall of the filter recovery box, an air suction port is arranged on the side wall below the secondary filter screen, the air suction port is connected to the vacuum pump, a water outlet and a reflux port are respectively arranged at the bottom of the side wall of the filter recovery box, the reflux port is connected to the delivery pipe through the reflux pipe, and the water outlet is connected to the wastewater treatment system through the water outlet pipe.

[0004] In this way, under the action of the vacuum pump, the slurry is fully filtered through the cooperation of the primary filter and the secondary filter, the filtrate is discharged through the water outlet and deionized water is introduced through the water inlet to repeatedly clean the filter cake on the filter, and finally the filter cake is obtained through the material taking port for pulping to re-prepare the slurry. However, the active viscosity of the re-prepared slurry decreases or loses the active viscosity, and cannot meet the requirements of the coating process. Utility Model Content

[0005] In order to overcome at least one defect of the above-mentioned prior art, the utility model provides a lithium battery slurry filtering and recycling system, which solves the problem that the active viscosity of the slurry re-prepared by the existing coating slurry recovery device decreases or loses its active viscosity.

[0006] The technical solution adopted by the utility model to solve the problem is:

[0007] A system for filtering and recycling lithium battery slurry, comprising:

[0008] Stirring device;

[0009] A filter device, the filter device having a feed port and a recovery port, the feed port of the filter device being connected to the stirring device through a feed pipe, and the stirring device being connected to the recovery port of the filter device through a recovery component;

[0010] A slurry heater is installed on the recovery component.

[0011] In some embodiments of the present invention, the recovery component further includes an electrically controlled regulating member, and the electrically controlled regulating member is used to control the on / off or flow rate of the slurry output from the recovery port to the slurry heater.

[0012] In some embodiments of the present invention, the electrically controlled regulating member includes an electric ball valve disposed at the recovery port, and a main control element electrically connected to the electric ball valve, and the electric ball valve is connected to the slurry heater via a heating input pipe.

[0013] In some embodiments of the utility model, the recovery component also includes a three-way reversing device arranged on the heating input pipe, and a ball-pushing pipe cleaning device connected to the three-way reversing device.

[0014] In some embodiments of the present invention, the filter device further has a guide structure, the cross-sectional area of ​​the guide structure gradually decreases along the central axis direction of the filter device and toward the recovery port, and the guide structure is connected to the recovery port.

[0015] In some embodiments of the present invention, the filtering device is a piston filter.

[0016] In some embodiments of the present invention, the filtering device further has a discharge port, the discharge port is located between the feed port and the recovery port, and a coating machine die head is configured on the discharge port.

[0017] In some embodiments of the present invention, a power device is provided between the feed port of the filtering device and the stirring device, and the power device is connected to the feed pipeline.

[0018] In some embodiments of the present invention, the power device is a diaphragm pump.

[0019] In some embodiments of the present invention, the heating range of the slurry heater is 35°C-65°C.

[0020] In summary, the utility model provides a lithium battery slurry filtering and recycling system, which has the following technical effects:

[0021] The slurry heater configured on the recovery component is cleverly utilized to heat the large particle slurry in the filtering device for reflow to the stirring device, thereby increasing the active viscosity of the large particle slurry. This not only solves the problem of decreased active viscosity or loss of active viscosity of the slurry re-prepared by the existing coating slurry recovery device, but also effectively achieves the effect of zero loss in the slurry filtration step. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an overall schematic diagram of a lithium battery slurry filtering and recycling system of the utility model;

[0023] Figure 2 for Figure 1 A local enlarged schematic diagram of point A in the middle.

[0024] Icons: 1- stirring device, 11- return port, 2- filtering device, 21- feed port, 22- recovery port, 23- flow guide structure, 24- discharge port, 3- slurry heater, 41- electric ball valve, 42- main control element, 43- heating input pipe, 44- three-way reversing device, 45- ball pusher cleaner, 46- heating output pipe, 5- coating machine die head, 6- power unit. DETAILED DESCRIPTION

[0025] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0028] Please combine the specific Figure 1 and Figure 2 As shown, the utility model discloses

[0029] A lithium battery slurry filtering and recycling system comprises a stirring device 1 and a filtering device 2, wherein a stirring chamber is provided inside the stirring device 1, and a stirring assembly for stirring the slurry is also arranged in the stirring chamber, so that the slurry in the stirring chamber is mixed more evenly.

[0030] In this embodiment, if Figure 1 As shown, the stirring device 1 has a return port 11 and an output port, both of which are connected to the stirring chamber, and the output port is preferably arranged at the bottom of the stirring device 1, so as to output all the slurry from the stirring chamber. The return port 11 is preferably arranged at the top of the stirring device 1, and can also be optionally arranged at the side of the stirring device 1, so that the recovered slurry can flow back into the stirring chamber of the stirring device 1 through the return port 11.

[0031] Furthermore, the filtering device 2 has a feed port 21 and a recovery port 22. The feed port 21 of the filtering device 2 is connected to the output port of the stirring device 1 through a feed pipe, so that the slurry in the stirring chamber can be transported to the filtering device 2 through the feed pipe for filtration. To ensure that the slurry can be transported to the filtering device 2 stably and quickly.

[0032] As a preferred method of this embodiment, please refer to Figure 1 As shown, a power device 6 is provided between the feed port 21 of the filter device 2 and the stirring device 1, and the power device 6 is connected to the feed pipeline. Specifically, a power input end and a power output end are provided on the power device 6, and the feed pipeline includes a first feed pipe and a second feed pipe, one end of the first feed pipe is connected to the output port of the stirring device 1, the other end of the first feed pipe is connected to the power input end of the power device 6, one end of the second feed pipe is connected to the power output end of the power device 6, and the other end of the second feed pipe is connected to the feed port 21 of the filter device 2.

[0033] In this way, the power device 6 provides sufficient power, so that the slurry can flow from the stirring chamber through the first feed pipe, the power device 6, the second feed pipe in sequence, and be delivered to the filtering device 2. Preferably, the power device 6 is a diaphragm pump, which can not only ensure that the flow rate of the slurry is automatically adjusted with the change of the back pressure of the diaphragm pump, but also the diaphragm pump can reduce the frequency of blockage of the power device 6 through the particles in the slurry, thereby further ensuring that the slurry with medium and high viscosity can be delivered more stably.

[0034] After the slurry enters the filter device 2, it is filtered by the filter device 2. During the filtering process, the slurry will not be exposed to the air, that is, the slurry does not come into contact with the air. Preferably, the filter device 2 is a piston filter, and the piston filter here is an existing mature liquid filtering device. Usually, the piston filter is mainly composed of a filter body, a piston assembly and a filter unit. When the slurry is transported to the filter device 2, under the driving action of the piston assembly, the slurry flows through the filter unit, and the large particles in the slurry are stuck, and the slurry will penetrate the filter unit and eventually output through the discharge port 24 of the filter unit. Preferably, the discharge port 24 of the filter device 2 is located between the feed port 21 and the recovery port 22, and the discharge port 24 is provided with a coating machine die 5, and the filtered slurry output from the discharge port 24 will be transported to the coating machine die 5 for subsequent coating process.

[0035] It should be noted that the use of piston filters has a higher filtration accuracy to meet the battery production process, and due to the use of hydraulic drive and piston movement, the filtration efficiency is high and a continuous filtration process can be ensured. In addition, the structure is simple and easy to maintain, and the maintenance cost of the piston filter is low, thereby reducing the later maintenance cost of the lithium battery slurry filtration and recycling system.

[0036] In other embodiments, the filter device 2 can also be selected as a two-level filter, that is, the filter device 2 is provided with a first-level filter screen and a second-level filter screen that are movably connected from top to bottom, and the filter device 2 is provided with a first-level filter port and a second-level filter port, the first-level filter port is arranged corresponding to the first-level filter screen, and the second-level filter port is arranged corresponding to the second-level filter screen. In this way, it can also be adapted to the filtering purpose of battery coating slurry.

[0037] The core of this embodiment is to combine Figure 1 and Figure 2 As shown, the lithium battery slurry filtering and recycling system also includes a slurry heater 3. The return port 11 of the stirring device 1 is connected to the recovery port 22 of the filtering device 2 through a recovery component. The slurry heater 3 is installed on the recovery component. The large particle slurry that enters the recovery component and flows back to the stirring device 1 (that is, the slurry obtained by obtaining the filter cake for pulping and re-preparing in the prior art) is isolated and heated under the action of the slurry heater 3, thereby increasing the active viscosity of the large particle slurry to meet the requirements of the coating process.

[0038] It should be noted that the slurry heater 3 can heat the slurry in the recovery component in the range of 35°C-65°C. When the temperature heated by the slurry heater 3 exceeds 65°C, the electrical properties of the slurry will be affected. In particular, when the temperature heated by the slurry heater 3 exceeds 70°C, the electrical properties of the slurry will be seriously affected. The heating temperature of the slurry can be set and adjusted according to the solid content in the large particle slurry flowing through the recovery component, so as to increase the activity of the large particle slurry.

[0039] As a further preferred method of this embodiment, please refer to Figure 1 and Figure 2 As shown, the above-mentioned recovery component also includes an electric control regulating member, which is used to control the on-off or flow rate of the slurry output from the recovery port 22 to the slurry heater 3, so that the flow rate of the large particle slurry in the recovery component can be well controlled, and then the active viscosity of the large particle slurry can be very effectively improved in cooperation with the slurry heater 3. For example, when it is necessary to significantly increase the active viscosity of the large particle slurry, the electric control regulating member can be controlled to reduce the flow rate of the large particle slurry, and at the same time, the heating temperature of the slurry heater 3 can be increased.

[0040] Specifically, please combine Figure 1 and Figure 2 As shown, the above-mentioned electric control regulating member includes an electric ball valve 41 provided at the recovery port 22, and a control main element 42 electrically connected to the electric ball valve 41, and the electric ball valve 41 is connected to the slurry heater 3 through a heating input pipe 43. In this way, the electric ball valve 41 can be more accurately regulated by the control main element 42, so as to more accurately control the flow rate of the large particle slurry, thereby better ensuring that the active viscosity of the large particle slurry meets the requirements of the coating process, and the operation is simple and efficient.

[0041] It is additionally noted that the slurry heater 3 can be heated by a heating wire or a heating tube, or can also be heated by a heating sheet. Of course, other heating components that can provide a large amount of heat to restore the active viscosity of the large particle slurry can be used as a conventional replacement for the above heating method.

[0042] Further, please refer to Figure 1 As shown, the slurry heater 3 is connected to the return port 11 of the stirring device 1 through the heating output pipe 46 of the recovery component, and the large particle slurry with good active viscosity is transported back to the stirring chamber for secondary grinding and dispersion, thereby ultimately achieving the purpose of lossless utilization, eliminating the problem of material waste, and achieving zero loss in the slurry filtration process.

[0043] As a preferred method of this embodiment, please refer to Figure 1 and Figure 2As shown, the recovery assembly also includes a three-way reversing device 44 provided on the heating input pipe 43, and a ball-pushing pipe cleaner 45 connected to the three-way reversing device 44. In this way, when the large-particle slurry appears to be agglomerated in the heating input pipe 43, the ball-pushing pipe cleaner 45 can be opened and the inert gas can be used as a power to perform ball-pushing pipe cleaning, thereby ensuring that the large-particle slurry does not block the heating input pipe 43, thereby further ensuring the stable and smooth reflux of the large-particle slurry.

[0044] As a further preferred method of this embodiment, please refer to Figure 2 As shown, the filter device 2 also has a flow guiding structure 23, the cross-sectional area of ​​which gradually decreases along the central axis direction of the filter device 2 and toward the recovery port 22, and the flow guiding structure 23 is connected to the recovery port 22. In this way, all the large particle slurry in the filter device 2 will be able to be guided to the recovery port 22 more smoothly and orderly, and the large particle slurry will eventually be transported into the heating input pipe 43 of the recovery component.

[0045] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A system for filtering and recycling lithium battery slurry, characterized in that: include: A stirring device (1); A filtering device (2), the filtering device (2) having a feed port (21) and a recovery port (22), the feed port (21) of the filtering device (2) being connected to the stirring device (1) via a feed pipe, and the stirring device (1) being connected to the recovery port (22) of the filtering device (2) via a recovery component; A slurry heater (3), wherein the slurry heater (3) is installed on the recovery component.

2. The lithium battery slurry filtering and recycling system according to claim 1, characterized in that: The recovery component also includes an electrically controlled regulating member, which is used to control the on / off or flow rate of the slurry output from the recovery port (22) to the slurry heater (3).

3. The lithium battery slurry filtering and recycling system according to claim 2, characterized in that: The electrically controlled regulating component comprises an electric ball valve (41) arranged at the recovery port (22), and a control main element (42) electrically connected to the electric ball valve (41), and the electric ball valve (41) is connected to the slurry heater (3) via a heating input pipe (43).

4. The lithium battery slurry filtering and recycling system according to claim 3 is characterized in that: The recovery assembly further comprises a three-way reversing device (44) arranged on the heating input pipe (43), and a ball-pushing pipe cleaning device (45) connected to the three-way reversing device (44).

5. The lithium battery slurry filtering and recycling system according to any one of claims 1 to 4, characterized in that: The filter device (2) further comprises a flow guiding structure (23), the cross-sectional area of ​​the flow guiding structure (23) gradually decreases along the central axis direction of the filter device (2) and towards the recovery port (22), and the flow guiding structure (23) is connected to the recovery port (22).

6. The lithium battery slurry filtering and recycling system according to any one of claims 1 to 4, characterized in that: The filtering device (2) is a piston filter.

7. The lithium battery slurry filtering and recycling system according to any one of claims 1 to 4, characterized in that: The filtering device (2) also has a discharge port (24), the discharge port (24) is located between the feed port (21) and the recovery port (22), and a coating machine die head (5) is arranged on the discharge port (24).

8. The lithium battery slurry filtering and recycling system according to claim 1, characterized in that: A power device (6) is provided between the feed port (21) of the filtering device (2) and the stirring device (1), and the power device (6) is connected to the feed pipeline.

9. The lithium battery slurry filtering and recycling system according to claim 8, characterized in that: The power device (6) is a diaphragm pump.

10. The lithium battery slurry filtering and recycling system according to any one of claims 1 to 4, characterized in that: The heating range of the slurry heater (3) is 35°C-65°C.

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