NMP (N-Methyl Pyrrolidone) cleaning waste liquid storage device of lithium ion battery slurry stirring equipment

Abstract

The utility model discloses a lithium ion battery slurry stirring equipment NMP (N-Methyl Pyrrolidone) cleaning waste liquid storage device which comprises a closed sedimentation tank body, a closable liquid inlet is formed in one side of the sedimentation tank body, and a closable liquid outlet is formed in the other side of the sedimentation tank body; a closable slurry discharge port is formed in the sedimentation tank body; a breather valve is arranged on the sedimentation tank body and is connected with an external activated carbon adsorption device; the stainless steel material is adopted, so that good corrosion resistance and sealing performance are achieved, NMP waste liquid can be effectively prevented from directly making contact with metal to generate chemical reaction, the stability of equipment is improved, and the service life of the equipment is prolonged; the six-surface closed design of the sedimentation tank body can effectively isolate the contact between the NMP waste liquid and the air, reduce the volatilization speed and reduce the pollution risk to the environment; furthermore, the breather valve and the activated carbon adsorption device can balance the pressure change in the sedimentation tank body and purify harmful components in the waste liquid, so that the environmental safety is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of waste liquid storage, in particular to a storage device for NMP cleaning waste liquid of lithium ion battery slurry stirring equipment. Background Art

[0002] In the production process of lithium-ion batteries, NMP solution is often used as a solvent for positive electrode slurry. The lower surface tension of NMP makes it one of the ideal solvents for preparing high-quality positive electrode slurry.

[0003] In the related art, the cleaning methods of lithium-ion battery slurry mixing tanks are mostly flushing with tap water, pure water, and then wiping with DMC or pure NMP; the solid particles and suspended matter in the waste liquid after cleaning are precipitated by physical and / or chemical reactions in a concrete tertiary sedimentation tank to achieve the purpose of purifying the waste liquid.

[0004] The inventors found that since solvent recovery in the lithium-ion battery production process mostly adopts condensation recovery method, the recovered waste liquid concentration is relatively high and can be used for the initial cleaning of the positive electrode slurry tank to improve its recycling performance; however, NMP is volatile and may pollute the air, water and soil. The use of traditional sedimentation tanks for precipitation and purification of impurities increases the risk of NMP leakage and affects the environment. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a lithium-ion battery slurry stirring equipment NMP cleaning waste liquid storage device to solve the problem.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] A storage device for NMP cleaning waste liquid of lithium-ion battery slurry stirring equipment comprises a closed sedimentation tank body, a closable liquid inlet is provided on one side of the sedimentation tank body, and a closable liquid discharge port is provided on the other side of the sedimentation tank body; a closable slurry discharge port is provided on the sedimentation tank body; a breathing valve is provided on the sedimentation tank body, and the breathing valve is connected to an external activated carbon adsorption device.

[0008] It is further configured as follows: a liquid inlet pipeline is fixedly connected and sealed at the liquid inlet, and a straight-through valve is arranged on the liquid inlet pipeline; a liquid discharge pipeline is fixedly connected to the liquid discharge port, one end of the liquid discharge pipeline is arranged inside the sedimentation tank body and extends downward, and the other end of the liquid discharge pipeline is arranged outside the sedimentation tank body and is installed with a valve; a slurry discharge pipeline is fixedly connected and sealed at the slurry discharge port, and a valve is arranged on the slurry discharge pipeline.

[0009] It is further configured as follows: an inner partition connected to the front and rear inner walls of the sedimentation tank body is provided inside the sedimentation tank body, and a through opening is opened at the front side or the rear side of the inner partition.

[0010] It is further configured as follows: a plurality of inner baffles are provided, the plurality of inner baffles are distributed along the direction from the liquid inlet to the liquid outlet, the inner wall of the sedimentation tank body and the plurality of inner baffles divide the internal space of the sedimentation tank body into a plurality of sedimentation spaces; the through openings arranged on adjacent inner baffles are staggered.

[0011] It is further configured as follows: a plurality of inspection openings are opened on the top surface of the sedimentation tank body, sealed inspection doors are provided at the plurality of inspection openings, a plurality of external straight ladders are provided outside the sedimentation tank body, internal straight ladders are provided in the plurality of sedimentation spaces, and the plurality of external straight ladders and the internal straight ladders correspond one-to-one to the plurality of sealed inspection doors.

[0012] It is further configured as follows: a first slope is provided on the bottom wall of the sedimentation space farthest from the liquid inlet, the upper surface of the first slope is inclined downward in a direction close to the liquid discharge port, and the right-angle side wall of the first slope is completely abutted and fixed to the inner partition.

[0013] It is further configured that: except for the bottom walls of the multiple precipitation spaces farthest from the liquid inlet, a second slope is provided, the upper surface of the second slope is inclined downward in the direction close to the liquid inlet, and the right-angle side wall of the second slope is arranged opposite to the liquid inlet and is completely abutted and fixed to the inner partition.

[0014] It is further configured as follows: a plurality of discharge ports are provided, the plurality of discharge ports correspond to the first slope body and the second slope body respectively, and the discharge ports are located at one side of the bottom end of the first slope body and the second slope body.

[0015] It is further configured as follows: the slope of the second slope is 15%-17%.

[0016] It is further configured as follows: the slope of the first slope is 19%-21%.

[0017] Compared with the prior art, the beneficial technical effects of the utility model are:

[0018] 1. The stainless steel material used in this application has good corrosion resistance and sealing properties, which can effectively prevent the NMP waste liquid from directly contacting the metal to produce chemical reactions, thereby improving the stability and life of the equipment; the six-sided closed design of the sedimentation tank body can effectively isolate the contact between the NMP waste liquid and the air, reduce the volatilization rate, and reduce the risk of pollution to the environment.

[0019] 2. The breathing valve and activated carbon adsorption device provided in this application can balance the pressure changes inside the sedimentation tank and purify harmful components in the waste liquid to ensure environmental safety.

[0020] 3. The flow path of the NMP waste liquid is lengthened by multiple internal baffles, and the staggered openings provide sufficient time for the slurry and impurities carried in the waste liquid to settle, thereby improving the sedimentation efficiency and separation effect.

[0021] 4. The first slope and the second slope designed at the bottom use gravity to guide the sediment to slide to the corresponding discharge port, making the sediment easy to remove and improving the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a top view of the utility model;

[0024] Figure 2 It is a rear view of the utility model;

[0025] Figure 3 For along Figure 1 Sectional view along line AA;

[0026] Figure 4 It is a side sectional view of the inner partition in the utility model.

[0027] Figure numerals: 1. sedimentation tank body; 2. liquid inlet; 3. liquid discharge port; 4. liquid discharge pipeline; 5. slurry discharge port; 6. breathing valve; 7. inner partition; 8. through port; 9. first slope; 10. second slope; 11. inspection port; 12. sealed inspection door; 13. external vertical ladder; 14. internal vertical ladder. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Example 1

[0032] Reference Figure 1-Figure 4 , a lithium-ion battery slurry stirring equipment NMP cleaning waste liquid storage device disclosed in the utility model, including a sedimentation tank body 1 which is set to be made of stainless steel and is closed on six sides. The stainless steel material has good corrosion resistance and sealing properties, can effectively prevent the NMP waste liquid from directly contacting the metal to produce a chemical reaction, and also has good pressure bearing performance;

[0033] Furthermore, the six-sided closed design of the sedimentation tank body 1 can effectively block the contact between the NMP waste liquid and the air, reduce the volatilization rate, and thus reduce the risk of NMP pollution to the environment.

[0034] A liquid inlet 2 is provided at one side of the sedimentation tank body 1, a liquid inlet pipeline is fixedly sealed at the liquid inlet 2, a straight-through valve is provided on the liquid inlet pipeline, and the other end of the liquid inlet pipeline is sealed and connected to the workshop pipeline;

[0035] A liquid discharge port 3 is provided on the side end surface of the sedimentation tank body 1 away from the liquid inlet 2, and a liquid discharge pipe 4 arranged in an L shape is fixedly connected to the liquid discharge port 3. One end of the liquid discharge pipe 4 is arranged inside the sedimentation tank body 1 and extends downward, and the other end of the liquid discharge pipe 4 is arranged outside the sedimentation tank body 1 and is installed with a valve.

[0036] A slurry discharge port 5 is provided on the upper surface of the sedimentation tank body 1, and a slurry discharge pipeline is fixedly sealed at the slurry discharge port 5, and a mechanical sealing valve is provided on the slurry discharge pipeline; in this embodiment, the slurry discharge port 5 is used to discharge the sediment, and when discharging the slurry, the sludge pump is connected to the slurry discharge pipeline, and the mechanical sealing valve and the sludge pump are opened to extract and discharge the sediment;

[0037] Furthermore, a breathing valve 6 is provided on the top surface of the sedimentation tank body 1, and the breathing valve 6 is connected to an external activated carbon adsorption device. It is worth mentioning that the activated carbon adsorption device is a prior art and will not be described in detail here.

[0038] When the NMP waste liquid cleans the battery slurry stirring device, the slurry and impurities in the stirring device will be taken out, and then discharged into the sedimentation tank body 1 through the liquid inlet 2. The slurry and impurities in the NMP waste liquid are precipitated in the sedimentation tank body 1, and the precipitated NMP waste liquid can be discharged from the drainage pipeline 4;

[0039] In this embodiment, the breathing valve 6 is provided to solve the positive and negative pressure problems caused by the change of the liquid level in the sedimentation tank body 1; specifically, when the liquid level inside the sedimentation tank body 1 changes, resulting in negative pressure inside the equipment, the breathing valve 6 can allow external air to enter the equipment to balance the pressure difference; conversely, when excessive positive pressure is generated inside the equipment, the breathing valve 6 can release excess gas or prevent the internal pressure from increasing; such a setting can reduce the risk of deformation and damage of the sedimentation tank body 1;

[0040] In this embodiment, an activated carbon adsorption device is set at the position where the breathing valve 6 is connected to the outside world. Since activated carbon is a highly porous material with adsorption properties, it can adsorb harmful components or odorous substances in the volatile organic matter inside the sedimentation tank body 1, thereby purifying the waste liquid and reducing pollution.

[0041] Example 2

[0042] A plurality of inner baffles 7 connected to the front and rear inner walls of the sedimentation tank body 1 are horizontally arranged inside the sedimentation tank body 1, and the plurality of inner baffles 7 are evenly distributed along the direction from the liquid inlet 2 to the liquid discharge port 3;

[0043] The inner wall of the sedimentation tank body 1 and a plurality of inner baffles 7 divide the inner space of the sedimentation tank body 1 into a plurality of sedimentation spaces. A through opening 8 is provided at the front or rear side of each inner baffle 7, and the through openings 8 on adjacent inner baffles 7 are arranged in a staggered manner.

[0044] The arrangement of multiple inner baffles 7 lengthens the flow path of the NMP waste liquid, and the staggered openings 8 can reduce the flow rate of the NMP waste liquid, play a flow blocking role, so that the slurry and impurities carried in the NMP waste liquid have sufficient time to settle, thereby improving the sedimentation efficiency and separation effect.

[0045] Furthermore, a first slope 9 is provided on the bottom wall of the precipitation space farthest from the liquid inlet 2, and a second slope 10 is provided on the bottom wall of the other plurality of precipitation spaces; specifically, the upper surface of the first slope 9 is inclined downward in a direction close to the discharge port 3, and the right-angled side wall of the first slope 9 is completely abutted and fixed to the inner partition 7, and the upper surface of the second slope 10 is inclined downward in a direction close to the liquid inlet 2, and the right-angled side wall of the second slope 10 is arranged opposite to the liquid inlet 2 and completely abutted and fixed to the inner partition 7;

[0046] Furthermore, the slope of the first slope 9 is 19%-21%; the slope of the second slope 10 is 15%-17%;

[0047] Furthermore, in this embodiment, a plurality of discharge ports 5 are provided, and the plurality of discharge ports 5 correspond one-to-one to the first slope 9 and the second slope 10 , respectively, and the discharge ports 5 are respectively provided at one side position at the bottom end of the first slope 9 and the second slope 10 .

[0048] The first slope 9 and the second slope 10 guide the slurry and impurities settled in the sedimentation tank 1 to slide down and accumulate at the position corresponding to the slurry discharge port 5 by gravity, creating convenient conditions for subsequent discharge and recycling.

[0049] Furthermore, since the particle size of the last stage of particles is small, their settling speed will be relatively slow. Therefore, increasing the slope of the first slope 9 can accelerate the settling speed of the particles along the preferred direction, allowing them to settle to the bottom faster and improve the sedimentation efficiency.

[0050] Example 3

[0051] A plurality of inspection openings 11 are provided on the top surface of the sedimentation tank body 1, and sealed inspection doors 12 are provided at the plurality of inspection openings 11. A plurality of external ladders 13 are provided outside the sedimentation tank body 1, and internal ladders 14 are provided in the plurality of sedimentation spaces. The plurality of external ladders 13 and the plurality of internal ladders 14 correspond one-to-one to the plurality of sealed inspection doors 12.

[0052] The working principle and beneficial effects of the utility model are:

[0053] After the NMP waste liquid cleans the lithium-ion battery slurry stirring equipment, the NMP waste liquid will carry the slurry and impurities in the stirring equipment and be discharged into the sedimentation tank body 1 through the liquid inlet 2. The purpose is to precipitate the slurry and impurities to achieve the purpose of purifying the waste liquid. The graded precipitation of the multiple precipitation spaces passed by the NMP waste liquid is finally discharged through the discharge port 3;

[0054] The sedimentation tank body 1 is made of stainless steel and is closed on six sides. It has corrosion resistance, sealing and pressure-bearing properties, which can effectively prevent chemical reactions and reduce the risk of NMP waste liquid polluting the environment. The breathing valve 6 arranged on the sedimentation tank body 1 can solve the positive and negative pressure problems caused by the changes in the liquid level inside the device, thereby reducing the risk of damage to the equipment, and the breathing valve 6 is provided with an activated carbon adsorption device, which can solve the problem of odor escape.

[0055] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it. The technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A lithium-ion battery slurry stirring equipment NMP cleaning waste liquid storage device, characterized in that: The invention comprises a closed sedimentation tank body (1), wherein a closable liquid inlet (2) is provided on one side of the sedimentation tank body (1), and a closable liquid discharge port (3) is provided on the other side of the sedimentation tank body (1); a closable slurry discharge port (5) is provided on the sedimentation tank body (1); and a breathing valve (6) is provided on the sedimentation tank body (1), and the breathing valve (6) is connected to an external activated carbon adsorption device.

2. A lithium-ion battery slurry stirring equipment NMP cleaning waste liquid storage device according to claim 1, characterized in that: The liquid inlet (2) is fixedly connected and sealed with a liquid inlet pipeline, and a straight-through valve is provided on the liquid inlet pipeline; the liquid discharge port (3) is fixedly connected with a liquid discharge pipeline (4), one end of the liquid discharge pipeline (4) is arranged inside the sedimentation tank body (1) and extends downward, and the other end of the liquid discharge pipeline (4) is arranged outside the sedimentation tank body (1) and is installed with a valve; the slurry discharge port (5) is fixedly connected and sealed with a slurry discharge pipeline, and a valve is provided on the slurry discharge pipeline.

3. A lithium-ion battery slurry stirring equipment NMP cleaning waste liquid storage device according to claim 1, characterized in that: The sedimentation tank body (1) has an inner baffle (7) connected to the front and rear inner walls of the sedimentation tank body (1), and a through opening (8) is provided at the front or rear side of the inner baffle (7).

4. A lithium-ion battery slurry stirring equipment NMP cleaning waste liquid storage device according to claim 3, characterized in that: A plurality of inner baffles (7) are provided, and the plurality of inner baffles (7) are distributed along the direction from the liquid inlet (2) to the liquid outlet (3); the inner wall of the sedimentation tank body (1) and the plurality of inner baffles (7) divide the internal space of the sedimentation tank body (1) into a plurality of sedimentation spaces; the through openings (8) provided on adjacent inner baffles (7) are arranged in a staggered manner.

5. A lithium-ion battery slurry stirring equipment NMP cleaning waste liquid storage device according to claim 4, characterized in that: The top surface of the sedimentation tank body (1) is provided with a plurality of inspection openings (11), and sealed inspection doors (12) are arranged at the plurality of inspection openings (11). A plurality of external straight ladders (13) are arranged outside the sedimentation tank body (1), and internal straight ladders (14) are arranged in the plurality of sedimentation spaces, and the plurality of external straight ladders (13) and the plurality of internal straight ladders (14) correspond to the plurality of sealed inspection doors (12) one by one.

6. A lithium-ion battery slurry stirring equipment NMP cleaning waste liquid storage device according to claim 4, characterized in that: A first slope (9) is provided on the bottom wall of the sedimentation space farthest from the liquid inlet (2), the upper surface of the first slope (9) being inclined downward in a direction close to the liquid discharge port (3), and the right-angled side wall of the first slope (9) being completely abutted and fixed to the inner partition (7).

7. A lithium-ion battery slurry stirring equipment NMP cleaning waste liquid storage device according to claim 6, characterized in that: In addition to the bottom walls of the plurality of sedimentation spaces farthest from the liquid inlet (2), a second slope (10) is provided, the upper surface of the second slope (10) is inclined downward in a direction close to the liquid inlet (2), and the right-angled side wall of the second slope (10) is arranged opposite to the liquid inlet (2) and is completely abutted and fixed to the inner partition (7).

8. A lithium-ion battery slurry stirring equipment NMP cleaning waste liquid storage device according to claim 7, characterized in that: A plurality of slurry discharge ports (5) are provided, and the plurality of slurry discharge ports (5) correspond one-to-one to the first slope body (9) and the second slope body (10), respectively, and the slurry discharge ports (5) are located at one side of the bottom end of the first slope body (9) and the second slope body (10).

9. A lithium-ion battery slurry stirring equipment NMP cleaning waste liquid storage device according to claim 8, characterized in that: The slope of the second slope (10) is 15%-17%.

10. The NMP cleaning waste liquid storage device for lithium-ion battery slurry stirring equipment according to claim 8, characterized in that: The slope of the first slope (9) is 19%-21%.

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