CN110508197B - Battery slurry homogenizing system and process flow thereof - Google Patents

Abstract

The invention provides a battery slurry homogenizing system, which comprises a structural frame, wherein at least one storage tank is arranged on the structural frame, mixing tanks with the same number as the storage tanks are arranged on the structural frame below the storage tank, and dispersing tanks with the same number as the mixing tanks are arranged on the structural frame below the mixing tanks; the discharge port of the storage tank is communicated with the powder feed port in a sealing way, and the mixing discharge port is communicated with the slurry feed port in a sealing way; the mixing tank is transversely arranged on the structural frame, and the dispersing tank is transversely arranged on the structural frame; the mixing tank is internally provided with a mixing stirring shaft, the mixing stirring shaft is provided with a spiral strip type mixing stirring blade, the dispersing tank is internally provided with a dispersing stirring shaft, the dispersing stirring shaft is provided with a spiral strip type dispersing stirring blade, and at least two dispersing parts are arranged in the dispersing tank in a slurry scattering manner so as to solve the defects that in the prior art, the battery slurry stirring equipment is difficult to clean, the sealing performance is poor, slurry splashing, dead angles and discontinuous operation are easy to generate.

Description

Battery slurry homogenizing system and process flow thereof

Technical Field

The invention relates to the technical field of battery slurry production equipment, in particular to a battery slurry homogenizing system and a process flow thereof.

Background

At present, along with popularization and application of new energy technology, the lithium battery is widely applied to energy storage power supply systems such as hydraulic power, firepower, wind power, solar power stations and the like, and uninterrupted power supplies for post and telecommunications communication, and particularly applied to various fields such as electric tools, electric bicycles, electric motorcycles, electric automobiles, military equipment, aerospace and the like. The development of large capacity lithium batteries as automotive power applications will make lithium batteries one of the primary power sources for automobiles. Therefore, the quality and the production and manufacturing technical requirements of the lithium battery are the most basic conditions for meeting different running conditions and safe running of the automobile.

However, the quality and manufacturing process of the lithium battery slurry are the basis for guaranteeing the quality of the lithium battery, and in the manufacturing process of the battery slurry, stirring the battery slurry prepared to be processed is a particularly important one-step process, along with the increasing wide application field of the lithium battery, the requirements on the manufacturing process of the battery slurry become higher and higher, in order to meet the requirements on the quality, various production devices and the production processes thereof are continuously optimized along with the continuous change, but in the manufacturing process of the battery slurry, stirring the slurry is an indispensable key step, and the importance of stirring is self-evident, so that many manufacturers are also continuously searching for new stirring devices and stirring methods, such as

The Chinese patent (publication number: CN 103285765A) discloses a double-planetary mixer, which comprises a material cylinder container, a power mixing structure and a high-speed dispersing structure, wherein the power mixing structure is provided with a mixing main shaft, a dispersing main shaft and a temperature measuring rod shaft, the power mixing structure is also provided with a stirring motor, a dispersing motor, a stirring mechanism and a planetary mechanism, the planetary mechanism is connected to the mixing main shaft, the high-speed dispersing structure is provided with the dispersing rod shaft and the emulsifying rod shaft, the dispersing rod shaft and the emulsifying rod shaft are connected to the dispersing main shaft, the dispersing main shaft provides power and control, and the material cylinder container is provided with a coil pipe and a guide plate for cooling. The double-planetary mixer is suitable for preparing the lithium iron phosphate storage battery taking acetone substances as solvents, and can effectively resist the corrosiveness of the acetone substances. The stirring equipment provided by the technical scheme disclosed by the patent is efficient and stable, the waste of circulating water is reduced, meanwhile, the occurrence of abnormality of the acetone solvent at high temperature can be avoided, and the corrosiveness of the acetone solvent is effectively resisted. However, the stirring device provided by the technical scheme is not beneficial to continuous automatic operation of the battery slurry homogenizing system, and has the following problems:

1. clean problem, to rabbling mechanism and jar container need regularly clean, just can guarantee the uniformity of stirring, must often clean just can avoid forming dead material or thick liquids wall built-up and remain etc. influence ejection of compact viscosity, fineness uniformity's problem, but because equipment is bulky, washs often not only wastes time and energy, also influences production efficiency simultaneously.

2. The problem of sealing is that after filling and stirring, the equipment of the technical scheme does not keep sealing on the slurry, so that misoperation of operators is very easy to occur, metal tools and the like are mixed into the slurry, friction is caused to form metal particles, and the equipment is damaged or the slurry is at risk of defective products.

3. The problem at splash and dead angle, because above-mentioned technical scheme's equipment is when the thick liquids stirring, rabbling mechanism needs to stretch into in the thick liquids, consequently, rabbling mechanism's diameter needs to be less than the material jar container is many, just can conveniently advance the discharge jar, this has just caused and can appear that rabbling mechanism and the clearance of material jar inner wall is too big in the stirring in-process, lead to being close to the material jar inner wall face side and form dead material, and the condition that powder mixed, and influence the fineness of thick liquids, in addition, owing to material jar upper end opening sets up, the defect that thick liquids splashed can also appear in the stirring in-process, the risk of the thick liquids water absorption denaturation after the stirring can also be increased simultaneously.

4. The problem of high failure rate is that slurry splashes into the stirring mechanism because the stirring mechanism is above the material cylinder, so that the failure rate of the stirring mechanism damage is high.

5. The operation is discontinuous, and the continuous operation and the interval operation for controlling the operation time are difficult to realize due to the limitation of the equipment structure of the technical scheme, so that the equipment has the defect of difficult compatibility on a plurality of production lines;

in addition, because the restriction of prior art structure, the condition that the feed cylinder descends can appear in long-time work, and then influence stirring effect.

A twin screw mixer is also often used in the prior art, but this type of apparatus also has problems, as follows,

1. The uniformity of the slurry is too poor: because the mixing time is seriously insufficient, the active substances cannot be completely infiltrated and depolymerized by the liquid, and the consistency of the slurry is poor;

2. The conductive agent is seriously agglomerated: due to the problem of short mixing time, the active material cannot be coated with the conductive agent material, causing agglomeration of the conductive agent, resulting in insufficient cycle times and energy density of the battery.

Even if a high-speed dispersing machine is adopted in the subsequent process, slurry with good dispersion is difficult to obtain, and even the phenomenon of re-agglomeration is caused;

3. The batch production cannot be realized, and the waste is serious: the twin-screw can only run continuously, and each time the twin-screw is stopped and started, the waste of a lot of slurry is caused at the front end and the rear end due to the adjustment operation, and the slurry remained in the screw last time can only be scrapped;

4. Is not easy to clean: if the material system is replaced, the screw cavity is thoroughly cleaned. As the whole screw machine body is disassembled, more than two days are generally needed, and the production time is wasted;

5. the pole piece has larger resistance, and the conductive agent and the adhesive are unevenly mixed because of poor cladding property of the active substance.

Therefore, aiming at the problems in the prior art, it is highly important to provide a battery slurry homogenizing technology which has the advantages of simple process operation, no splashing and dead angle of slurry, good slurry uniformity, continuous or intermittent operation, low cost and low energy consumption.

Disclosure of Invention

The invention aims to avoid the defects in the prior art and provide a battery slurry homogenizing system which has the advantages of simple process operation, no splashing and dead angle of slurry, good slurry uniformity, continuous or intermittent operation, low cost and low energy consumption.

Another object of the present invention is to provide a process flow of a battery slurry homogenizing system, which has the advantages of simple process operation, no splashing and dead angle of slurry, good slurry uniformity, continuous or intermittent operation, low cost and low energy consumption, and avoids the defects in the prior art.

The aim of the invention can be achieved by the following technical scheme:

the utility model provides a battery thick liquids homogenate system, including the structure frame, the structure frame sets up at least one holding vessel, its characterized in that: mixing tanks with the same number as the storage tanks are correspondingly arranged below the storage tanks, and dispersing tanks with the same number as the mixing tanks are correspondingly arranged below the mixing tanks;

A storage tank discharge port arranged at the bottom of the storage tank is communicated with a powder feed port arranged at the upper part of the mixing tank, and a mixing discharge port arranged at the lower part of the mixing tank is communicated with a slurry adding port arranged at the upper part of the dispersing tank;

A mixing stirring shaft coaxial with the mixing tank body is horizontally arranged in the mixing tank, the mixing stirring shaft is provided with a spiral mixing stirring blade, and one side of the mixing tank is provided with a first speed reducing motor for driving the mixing stirring shaft to rotate;

The dispersing tank is internally and horizontally provided with a dispersing stirring shaft coaxial with the tank body of the dispersing tank, the dispersing stirring shaft is provided with a spiral dispersing stirring blade, one side of the dispersing tank is provided with a second gear motor for driving the dispersing stirring shaft to rotate, at least two dispersing parts are arranged in the dispersing tank, and the axial direction of each dispersing part is perpendicular to the axial direction of the spiral dispersing stirring blade.

Preferably, the structure frame is provided with two storage tanks, two mixing tanks and two dispersing tanks side by side to form two parallel-connected homogenizing systems, and the two homogenizing systems are crossed or synchronously operated so as to realize continuous or indirect slurry production.

Preferably, the ribbon type mixing stirring blade comprises a mixing outer rotor blade and a mixing inner rotor blade, wherein the mixing outer rotor blade is arranged on a mixing stirring shaft in a mode that the stirring slurry moves towards the middle part of the tank body, and the mixing inner rotor blade is arranged on the mixing stirring shaft in a mode that the stirring slurry moves towards two sides of the tank body;

The spiral type dispersing stirring blade comprises a dispersing outer propeller and a dispersing inner propeller, wherein the dispersing outer propeller is arranged on a dispersing stirring shaft in a mode that stirring slurry moves towards the middle of the tank body, and the dispersing inner propeller is arranged on the dispersing stirring shaft in a mode that stirring slurry moves towards the two sides of the tank body.

Preferably, the mixing external rotor blade comprises a proximal mixing blade and a distal mixing blade, the proximal mixing blade is arranged on a mixing stirring shaft close to the direction of the first speed reduction motor, the distal mixing blade is arranged on a mixing stirring shaft far away from the direction of the first speed reduction motor, and the proximal mixing blade and the distal mixing blade are consistent in structure and opposite in rotation direction;

The mixing internal rotation paddle comprises a near-end mixing paddle and a far-end mixing paddle, the near-end mixing paddle is arranged on a mixing stirring shaft close to the direction of the first speed reduction motor, the far-end mixing paddle is arranged on a mixing stirring shaft far away from the direction of the first speed reduction motor, and the near-end mixing paddle and the far-end mixing paddle are consistent in structure and opposite in rotation direction;

The dispersing outer propeller and the dispersing inner propeller are respectively consistent with the structures of the mixing outer propeller blade and the mixing inner propeller blade.

Preferably, the radial distance between the mixing outer propeller blade and the dispersing outer propeller is greater than the radial distance between the mixing inner propeller blade and the dispersing inner propeller blade respectively.

Preferably, the clearance between any point on the outer edges of the mixing outer propeller blade and the dispersing outer propeller and the inner walls of the mixing tank and the dispersing tank is 1-10 mm.

Preferably, the upper end of the dispersion tank around the slurry feeding port is provided with two dispersing parts, each dispersing part comprises a dispersing motor, a dispersing motor seat, a dispersing shaft and a dispersing disc, the lower end of the dispersing motor seat is fixedly connected with the dispersion tank, the upper end of the dispersing motor seat is provided with the dispersing motor, the output end of the dispersing motor is connected with the dispersing shaft, the dispersing shaft penetrates through the dispersing motor seat to extend into the dispersing tank, the lower end of the dispersing shaft is provided with the dispersing disc, the dispersing shaft is in sealing connection with the dispersing motor seat, and the dispersing disc rotates in the dispersing tank under the driving of the dispersing motor.

Preferably, the two dispersing shafts are respectively positioned at two sides of the dispersing stirring shaft after extending into the dispersing tank, and the two dispersing discs are respectively positioned in the dispersing tank below the dispersing stirring shaft.

Preferably, the inner walls of the mixing tank and the dispersing tank are coated with Teflon, and the surfaces of the ribbon mixing stirring blade and the ribbon dispersing stirring blade are coated with Teflon.

The aim of the invention can be achieved by the following technical scheme:

A process flow for providing a battery slurry homogenization system, such as the above battery slurry homogenization system, comprising the steps of:

Firstly, stirring dry powder, namely putting the powder in a storage tank into a mixing tank, synchronously rotating a mixing stirring shaft when the powder enters the mixing tank, uniformly mixing a plurality of powder, and continuously stirring in the state;

Step two, stirring with high viscosity, adding part of colloid into a mixing tank, synchronously rotating a mixing stirring shaft when the colloid is added into the mixing tank, stirring the powder and the colloid in the mixing tank to be in a high-viscosity mud state, and continuously stirring in the state;

step three, diluting and stirring, namely adding the rest colloid into a mixing tank, synchronously rotating a mixing stirring shaft when the colloid is added into the mixing tank, stirring the high-viscosity slurry in the mixing tank to be diluted, and continuously stirring in the state;

Step four, transferring the slurry, vacuumizing a dispersion tank, adding positive pressure into the mixing tank, rapidly conveying the slurry from the mixing tank to the dispersion tank, adding liquid into the mixing tank for flushing after the slurry is conveyed, and enabling the flushed liquid to enter the dispersion tank;

Step five, dispersing and stirring, wherein the dispersing tank disperses and stirs the slurry through rotation of a dispersing and stirring shaft until the slurry meets the requirements, and then the slurry enters the next working procedure.

The invention has the beneficial effects that:

The battery slurry homogenizing system has the following beneficial effects:

1. the production and operation of the slurry are simpler:

Because the mixing form is changed, the production process is embedded into the production program before the equipment leaves the factory, and a user can put into production only by inputting the formula proportion of various materials according to the productivity, the need of readjusting the production equipment such as rotating speed, temperature, time and the like due to the different sizes of the equipment and the product system is completely avoided.

2. The novel slurry mixing device has no splashing and dead angle:

All materials are mixed in the mixing tank body in a full-contact and closed manner, powder cannot be mixed, slurry splashes, dead materials are formed between the stirring paddles and the tank body, the trouble of scraping the paddles and the worry of contacting with external air are also omitted, and the method is particularly suitable for slurry production by adopting high-nickel materials as raw materials by current battery slurry manufacturers.

3. Consistency of the slurry is further ensured:

Because the high speed and stirring in the tank body are directly transmitted by the speed reducer, the rotating speed is absolutely free of errors, thereby ensuring the possibility of making slurry consistency.

4. Continuous and batch production can be carried out:

the system can be used as a continuous type, can also be used for intermittent slurry production, and can discharge cleanly.

5. The slurry does not agglomerate:

The equipment that this technical scheme provided all is sealing state around the stirring, and the jar body is airtight for thick liquids quality obtains guaranteeing, does not produce the caking phenomenon.

6. The comprehensive investment cost and the energy consumption of the system are low:

The slurry produced by the system is about 10% of the energy consumption of other equipment such as a stirrer and the like under the same yield.

7. The installation and the debugging are simple, and the period is short:

The system is of a modularized design structure, and is convenient to assemble and high in efficiency.

Compared with the prior art, the invention has the advantages of simple process operation, no splashing and dead angle of the slurry, good uniformity of the slurry, continuous or intermittent operation, low cost and low energy consumption.

Drawings

The invention is further illustrated by means of the accompanying drawings, the embodiments in which do not constitute any limitation of the invention.

Fig. 1 is a schematic diagram of an embodiment of a battery slurry homogenization system of the present invention.

Fig. 2 is a schematic view showing the internal structure of a kneading tank of an embodiment of a battery slurry homogenizing system of the present invention.

Fig. 3 is a schematic view showing the internal structure of a dispersion tank of an embodiment of a battery slurry homogenizing system of the present invention.

Fig. 4 is a schematic view showing the stirring direction of the slurry in the kneading tank in the embodiment of the battery slurry homogenizing system of the present invention.

Fig. 5 is a schematic view of the direction of dispersion tank slurry agitation for one embodiment of a battery slurry homogenization system of the present invention.

Fig. 6 is a schematic view showing the structure of a ribbon-shaped kneading stirring blade in an embodiment of a battery slurry homogenizing system of the present invention.

Fig. 7 is a schematic view showing an internal structure of a dispersion motor base of an embodiment of a battery slurry homogenizing system of the present invention.

Fig. 8 is a schematic view of a dispersion disk structure of an embodiment of a battery slurry homogenization system of the present invention.

Fig. 9 is a pole piece diagram of an embodiment of a battery slurry homogenization system of the present invention with the slurry agitated.

Fig. 10 is a pole piece diagram of a conventional mixer of the prior art after the slurry is mixed.

Fig. 11 is a pole piece diagram of a prior art twin screw mixer slurry after mixing.

Fig. 12 is a pole piece diagram of a twin screw mixer of the prior art after the slurry is stirred.

Fig. 13 is a schematic view of a production line having a battery slurry homogenization system of the present invention.

Fig. 1 to 8 include:

1-a storage tank,

11-A discharge port of the storage tank;

2-a mixing tank,

21-A powder feeding port,

22-A mixing discharge port,

23-A mixing stirring shaft,

24-Spiral mixing stirring blade,

241-The mixing outer propeller blade,

2411-A proximal mixing blade,

2412-Distal mixing blade,

242-Mixing internal rotation blade,

2421-A proximal mixing blade,

2422-A distal mixing blade,

25—A first gear motor;

3-a dispersion tank,

31-A slurry inlet port,

32-A discharge hole,

33-A dispersing stirring shaft,

34-Spiral strip type dispersing stirring blade,

35-A second gear motor;

4-a dispersing part,

41-A dispersion motor,

42-A dispersion motor mount,

43-A dispersion axis,

44-A dispersion plate,

45-A mechanical seal seat,

46-A bearing,

47-A mechanical seal,

48-A framework oil seal,

49-An upper bearing,

491-An upper bearing seat;

5-a powder feeding system;

6, a powder weighing system;

7, a battery slurry homogenizing system;

8-a slurry storage system;

9-glue solution metering and conveying system;

10-slurry delivery pig System.

Detailed Description

The invention will be further described with reference to the following examples:

Example 1

As shown in fig. 1 to 8, the present embodiment provides a battery slurry homogenizing system, which comprises a structural frame, wherein two storage tanks 1 are arranged on the structural frame in parallel, a mixing tank 2 is connected to a position corresponding to the storage tanks 1 in the longitudinal direction, and a dispersing tank 3 is connected to a position corresponding to the mixing tank 2 below each storage tank 1.

The bottom of the storage tank 1 is provided with a storage tank discharge port 11, the upper end of the mixing tank 2 is provided with a powder feed port 21, the storage tank discharge port 11 is communicated with the powder feed port 21 in a sealing way, the middle part of the lower end of the mixing tank 2 is provided with a mixing discharge port 22, the middle part of the upper end of the dispersing tank 3 is provided with a slurry feeding port 31, and the mixing discharge port 22 is communicated with the slurry feeding port 31 in a sealing way; a discharge hole 32 is formed in the bottom of the dispersion tank 3;

The mixing tank 2 is horizontally arranged on the structural frame in a manner of sealing and stirring the slurry in the mixing tank, and the dispersing tank 3 is horizontally arranged on the structural frame in a manner of sealing, scattering and stirring the slurry in the mixing tank;

A mixing stirring shaft 23 coaxial with the tank body of the mixing tank 2 is horizontally arranged in the mixing tank 2, a spiral mixing stirring blade 24 is arranged on the mixing stirring shaft 23, and a first reducing motor 25 for driving the mixing stirring shaft to rotate is arranged on one side of the mixing tank 2;

The dispersing tank 3 is internally and horizontally provided with a dispersing stirring shaft 33 coaxial with the tank body of the dispersing tank 3, the dispersing stirring shaft 33 is provided with a spiral dispersing stirring blade 34, one side of the dispersing tank 3 is provided with a second speed reducing motor 35 for driving the dispersing stirring shaft 33 to rotate, two dispersing parts 36 are arranged in the dispersing tank 3 in a slurry scattering mode, and the axial direction of the dispersing parts 36 is perpendicular to the axial direction of the spiral dispersing stirring blade 34.

The upper end of the mixing tank is also provided with a liquid filling port, a glue solution filling port, a vacuum component and a breathing port; the side of the mixing tank is provided with an observation port, a temperature sensor and a low liquid level sensor.

The upper end of the dispersion tank is also provided with a helium adding port, a liquid adding port and a vacuum component; the side of the dispersion tank is provided with an inspection port, a temperature sensor, a sampling valve and a low liquid level sensor.

Specifically, two storage tanks are arranged on the structure frame in parallel, a mixing tank is connected to the position, corresponding to the position, of the lower part of each storage tank in the longitudinal direction, and a dispersing tank is connected to the position, corresponding to the position, of the lower part of each mixing tank.

The structure ensures that the battery slurry homogenizing system can realize alternate continuous production operation of slurry stirring and intermittent slurry production operation of independent or synchronous operation through controlling the two sets of systems, can complete various operation requirements in a slurry automatic production line, and greatly improves the applicability of the battery slurry homogenizing system.

Example 2

As shown in fig. 1 to 8, the main technical solution of this embodiment is substantially the same as that of embodiment 1, and the characteristics not explained in this embodiment are explained in embodiment 1, and are not described in detail herein. This embodiment differs from embodiment 1 in that: the ribbon-type kneading stirring blade 24 includes a kneading outer rotor blade 241 and a kneading inner rotor blade 242,

Specifically, the mixing external rotating blade 241 is arranged on the mixing stirring shaft in a manner of moving the stirring slurry to the middle of the tank body, and the mixing internal rotating blade is arranged on the mixing stirring shaft in a manner of moving the stirring slurry to two sides of the tank body;

Specifically, the structure ensures that the slurry can be stirred in the mixing tank and the dispersing tank in all directions without dead angles, avoids the defect of dead materials caused by insufficient stirring, and simultaneously, the mixing outer rotating blades, the mixing inner rotating blades and the dispersing outer rotating blades and the dispersing inner rotating blades are mutually staggered to stir the slurry, so that the effect of stirring uniformly can be maximized, and the requirement on stirring the slurry can be met at a higher speed.

When the first gear motor 25 rotates counterclockwise, the mixing outer rotor blade 241 and the mixing inner rotor blade 242 are driven to rotate, so that the slurry is mixed.

If the first gear motor 25 rotates clockwise, an effect opposite to the above-described stirring direction is produced.

The ribbon type dispersing stirring blade 34 comprises a dispersing outer propeller 341 and a dispersing inner propeller 342, the dispersing outer propeller 341 is arranged on the dispersing stirring shaft 33 in a mode that stirring slurry moves towards the middle of the tank body, and the dispersing inner propeller 342 is arranged on the dispersing stirring shaft in a mode that stirring slurry moves towards two sides of the tank body.

When the second gear motor 35 rotates counterclockwise, the dispersing outer propeller 341 and the dispersing inner propeller 342 are driven to rotate, so that slurry is stirred.

If the second reduction motor 35 rotates clockwise, an effect opposite to the above-described stirring direction is produced.

The mixing external propeller blades 241 include a proximal mixing propeller blade 2411 and a distal mixing propeller blade 2412, the proximal mixing propeller blade 2411 is provided on the mixing and stirring shaft 23 in the direction close to the first gear motor 25, the distal mixing propeller blade 2412 is provided on the mixing and stirring shaft 23 in the direction away from the first gear motor 25, and the proximal mixing propeller blade 2411 and the distal mixing propeller blade 2412 have the same structure and are opposite in rotation direction;

the internal mixing rotation paddles 242 comprise a proximal mixing paddle 2421 and a distal mixing paddle 2422, the proximal mixing paddle 2421 is arranged on the mixing stirring shaft 23 in the direction close to the first gear motor 25, the distal mixing paddle 2421 is arranged on the mixing stirring shaft 23 in the direction far away from the first gear motor 25, and the proximal mixing paddle 2421 and the distal mixing paddle 2422 are consistent in structure and opposite in rotation direction;

The proximal mixing blade 2411 is spirally formed in a clockwise direction in a direction away from the first gear motor 25, and the distal mixing blade 2412 is spirally formed in a counterclockwise direction in a direction away from the first gear motor 25;

the proximal mixing blade 2421 is spirally anticlockwise in a direction away from the first gear motor 25, and the distal mixing blade 2422 is spirally clockwise in a direction away from the first gear motor 25;

The proximal mixing paddles 2411 comprise four proximal paddles with identical rotation directions and arranged at intervals, the distal mixing paddles 2412 comprise four distal paddles with identical rotation directions and arranged at intervals, the proximal paddles are in a clockwise spiral shape, and the distal paddles are in a counterclockwise spiral shape.

The proximal mixing blade 2421 comprises two proximal blades which have identical rotation directions and are in a crossed spiral shape, the distal mixing blade 2422 comprises two distal blades which have identical rotation directions and are in a crossed spiral shape, the proximal blades are in a anticlockwise spiral shape, and the distal blades are in a clockwise spiral shape.

The outer dispersing propeller 341 and the inner dispersing propeller 342 are identical to the outer mixing propeller 241 and the inner mixing propeller 242 in structure.

Specifically, the structure ensures that the proximal mixing blade is in a clockwise spiral shape along the direction away from the first gear motor, and the distal mixing blade is in a counterclockwise spiral shape along the direction away from the first gear motor;

The near-end mixing blade is in a spiral shape in a counterclockwise direction along the direction away from the first gear motor, and the far-end mixing blade is in a spiral shape in a clockwise direction along the direction away from the first gear motor;

ensures the uniformity of stirring the slurry in the tank body, and meets the requirements on the fineness and viscosity of the slurry.

The radial distance of the mixing outer propeller blades 241 and the dispersing outer propeller 341 is greater than the radial distance of the mixing inner propeller blades 242 and the dispersing inner propeller 342, respectively.

Specifically, structural stability of the mixing stirring shaft is guaranteed through the structure, and meanwhile, the mixing effect is improved when slurry is stirred, and on the other hand, the requirement on full slurry stirring can be met.

The clearance between any one of the outer edges of the kneading outer propeller blades 241 and the dispersing outer propeller 341 and the inner walls of the kneading tank 2 and the dispersing tank 3 is 2mm.

Specifically, under the rotation of the outer propeller, the structure ensures that the slurry in the tank body is completely in the stirring process, and avoids the situation that dead material areas are formed or stirring is not in place due to too large gap between the outer propeller and the inner wall of the tank body due to too small diameter of the outer propeller.

As shown in fig. 4, when the first gear motor 25 rotates counterclockwise, the ribbon mixing stirring blade 24 drives the slurry to move in a stirring direction.

As shown in fig. 5, the second gear motor 35 rotates counterclockwise, and the ribbon-shaped dispersing and stirring blade 34 drives the slurry to move in a stirring direction.

Example 3

As shown in fig. 1 to 8, the main technical solution of this embodiment is substantially the same as that of embodiment 1, and the characteristics not explained in this embodiment are explained in embodiment 1, and are not described in detail herein. This embodiment differs from embodiment 1 in that: two dispersing parts 4 are arranged at the upper end of the dispersing tank 3 around the slurry feeding port 31;

The dispersing part 4 comprises a dispersing motor 41, a dispersing motor seat 42, a dispersing shaft 43 and a dispersing disc 44, wherein the lower end of the dispersing motor seat 42 is fixedly connected with the dispersing tank 3, the dispersing motor 41 is arranged at the upper end of the dispersing motor seat 42, the dispersing shaft 43 is connected with the output end of the dispersing motor 41, the dispersing shaft 43 penetrates through the dispersing motor seat 42 to extend into the dispersing tank 3, the dispersing disc 44 is arranged at the lower end of the dispersing shaft 43, the dispersing shaft 43 is in sealing connection with the dispersing motor seat 42, and the dispersing disc 44 rotates in the dispersing tank 3 under the driving of the dispersing motor 41.

The two dispersing shafts 43 extend into the dispersing tank 3 and are respectively located at two sides of the dispersing stirring shaft 33, and the two dispersing discs 44 are both located in the dispersing tank 3 below the dispersing stirring shaft 33.

The dispersing shaft 43 is in a specific structure of being in sealing connection with the dispersing motor base 42, a mechanical seal base 45 is arranged on the inner wall of the joint of the dispersing motor base 42 and the tank body, a rotating shaft hole is formed in the middle of the mechanical seal base 45, a bearing 46 is arranged on the rotating shaft hole, and the dispersing shaft 43 penetrates through the bearing 46 and rotates on the rotating shaft hole.

A mechanical seal 47 is sleeved on the dispersing shaft 43 above the mechanical seal seat 45, and the mechanical seal 47 is connected with the mechanical seal seat 45.

And a framework oil seal 48 is sleeved on the dispersing shaft 43 below the mechanical seal seat 45.

An upper bearing 49 is sleeved on the dispersing shaft 43 at the joint of the dispersing motor 41, an upper bearing seat 50 for fixing the position of the upper bearing 49 is arranged at the joint of the dispersing motor seat 42 and the dispersing motor 41, and the vertical connecting line of the upper bearing 49 and the central point of the bearing 46 coincides with the axis of the dispersing shaft 43.

The dispersion disk 44 is provided on the lower end surface of the dispersion shaft 43 such that the slurry around the dispersion disk 44 circulates upward and downward.

A plurality of upper dispersing jaw pieces 441 are provided on the circumferential edge of the dispersing disc 44, and the upper dispersing jaw pieces 441 are formed to extend away from the dispersing disc 44 and bend upward of the dispersing disc 44;

The upper dispersing jaw pieces 441 are provided with lower dispersing jaw pieces 442 at intervals, and the lower dispersing jaw pieces 442 are formed to extend away from the dispersing disc 44 and bend downward of the dispersing disc 44.

Specifically, the dispersing part is added in the tank body, so that the slurry can be dispersed through the dispersing part while being stirred, the requirement on the stirring effect of the battery slurry can be met, the stirring environment of the dispersing tank on the slurry is changed, and the stirring efficiency is greatly improved.

Specifically, the positions of the dispersing shafts of the structure ensure that the slurry at two sides of the stirring shaft (namely, the whole slurry in the tank body) is fully dispersed, so that the defect that when two dispersing shafts are arranged at the same side of the stirring shaft, the dispersing is uneven (only one side of slurry is circularly dispersed) and the slurry cannot meet the use requirement is avoided,

In addition, after the slurry enters the tank body, the slurry can be overturned and stirred in the tank body under the drive of the stirring shaft, so that the slurry can be concentrated under the tank body, and the dispersing disc is arranged in the tank body under the stirring shaft, so that the dispersing disc can effectively disperse all the slurry in the stirring process, the dispersing disc at the position is at a preferable position, a better dispersing effect can be generated, and the dispersing discs at other height positions are also feasible.

Example 4

As shown in fig. 1 to 8, the main technical solution of this embodiment is substantially the same as that of embodiment 1, and the characteristics not explained in this embodiment are explained in embodiment 1, and are not described in detail herein. This embodiment differs from embodiment 1 in that: the inner walls of the mixing tank and the dispersing tank are coated with a Teflon layer, the surfaces of the spiral mixing stirring blades and the spiral dispersing stirring blades are coated with the Teflon layer, and the dispersing disc is coated with the Teflon layer.

Specifically, the defects of slurry wall hanging and residue are avoided by the structure.

Example 5

An embodiment of a process flow of a battery slurry homogenization system of the invention includes the steps of:

Firstly, stirring dry powder, namely putting the powder in a storage tank into a mixing tank, synchronously rotating a mixing stirring shaft when the powder enters the mixing tank, uniformly mixing a plurality of powder, and continuously stirring in the state;

Step two, stirring with high viscosity, adding part of colloid into a mixing tank, synchronously rotating a mixing stirring shaft when the colloid is added into the mixing tank, stirring the powder and the colloid in the mixing tank to be in a high-viscosity mud state, and continuously stirring in the state;

step three, diluting and stirring, namely adding the rest colloid into a mixing tank, synchronously rotating a mixing stirring shaft when the colloid is added into the mixing tank, stirring the high-viscosity slurry in the mixing tank to be diluted, and continuously stirring in the state;

Step four, transferring the slurry, vacuumizing a dispersion tank, adding positive pressure into the mixing tank, rapidly conveying the slurry from the mixing tank to the dispersion tank, adding liquid into the mixing tank for flushing after the slurry is conveyed, and enabling the flushed liquid to enter the dispersion tank;

Step five, dispersing and stirring, wherein the dispersing tank disperses and stirs the slurry through rotation of a dispersing and stirring shaft until the slurry meets the requirements, and then the slurry enters the next working procedure.

Specifically, the following effects can be achieved by the steps:

1. Primary carbon coating of active material:

The pre-stirring of the dry powder solves the problem of uniform premixing of powder and primary carbon coating of active substances. By adopting a horizontal device and a special stirring paddle mode, even if the proportion of powder to powder is particularly large, the powder can be completely mixed within 10 min;

2. mixing:

The working process of the steps is that the premixed dry powder becomes a pasty kneading working condition under a proper glue solution proportion;

3. Depolymerizing infiltration:

the purpose is to disassemble the agglomerated particles, and modify the particle surface, namely: interfacial modification of the actives. After sintering, the active substances are generally difficult to infiltrate, and the surface of the active substances is provided with a plurality of irregular micropores containing gas, so that the modification aims to fully infiltrate particles, remove the gas and improve the surface tension;

4. Coating

Uniformly and firmly coating auxiliary materials such as a conductive agent and an active substance;

5. Scientific linear velocity and bonding process:

the device does not destroy the physical structure of particles during operation;

As shown in FIG. 9, the slurry pole piece stirred by the refining system provided by the application has bright and moist appearance, good fluidity, and better solid content, fineness and viscosity than the slurry stirred by the equipment in the prior art, so that the refining system provided by the embodiment can continuously prepare the slurry with good consistency in a short time, is simple to operate, low in labor intensity and clean in feeding, saves the trouble of cleaning a tank body and scraping the slurry, avoids the problem that the quality of the slurry is influenced by humid air, and has the advantages of small equipment occupation area, large treatment capacity and less operators, thus being excellent equipment for mass high-quality pulping.

As shown in fig. 10, the pole piece of the slurry made by the conventional stirrer has the following defects:

1. the proportion of the formula is easy to be out of order, and the slurry absorbs water and is denatured:

The traditional stirrer is in a lifting and closing type mixing mode of an upper bucket body and a lower bucket body, and transmission structures such as stirring paddles penetrate into the lower bucket body from the upper bucket body to drive materials to stir. In this way, the slurry is easy to splash on the upper barrel body and the transmission part during stirring, the powder and the slurry become dead materials, and the slurry contacts with air after the barrel body descends, so that the slurry is denatured after water absorption;

2. Consistency of the slurry is difficult to ensure:

Because the traditional stirrer is driven by a belt and a chain, the rotation speed cannot be constant along with the stretching of the belt and the chain, and the slurry splashes, so that the prepared slurry is in imbalance of various proportions such as solid content, viscosity and the like, and the consistency of the slurry batch is seriously out of control;

3. The fineness of the slurry is difficult to control:

Because the stirring paddles of the traditional stirrer have a large gap with the barrel wall and the barrel bottom, dead materials and uneven mixing are easy to generate. In addition, the slurry splashed to the upper part of the stirring barrel is not mixed at all. Therefore, the fineness of the slurry is generally more than twice the value of the incoming material particles;

4. The failure rate is high:

Because complicated drive component is in thick liquids agitator top, when stirring thick liquids, thick liquids splash and easily get into the bearing, and liquid also can get into the bearing when wasing, leads to damaging the fault rate high. In addition, many factory produced mixers, as well as the hazard of grease leaking into the slurry;

5. The continuous pulping and cleaning are inconvenient:

The traditional stirrer can only prepare pulp one tank by one tank and clean for more than eight hours one time;

due to the influence of a plurality of factors such as equipment structure, the slurry cannot be prepared by a traditional stirrer;

Therefore, from the comparison of pole pieces, the refining system has better slurry effect compared with the traditional stirring equipment.

As shown in fig. 11 and 12, the pole piece of the paste made by the twin screw extruder has the following drawbacks due to the twin screw extruder:

1. the uniformity of the slurry is too poor:

Because the mixing time is seriously insufficient, active substances cannot be completely infiltrated and depolymerized by liquid, the consistency of slurry is poor, and particularly, the ketjen black materials added for improving the conductivity of the battery are added at present;

2. the conductive agent is seriously agglomerated:

Due to the problem of short mixing time, the active material cannot be coated with the conductive agent material, causing agglomeration of the conductive agent, resulting in insufficient cycle times and energy density of the battery.

Even if a high-speed dispersing machine is adopted in the subsequent process, slurry with good dispersion is difficult to obtain, and even the phenomenon of re-agglomeration is caused;

3. The batch production cannot be realized, and the waste is serious:

the twin-screw can only run continuously, and each time the twin-screw is stopped and started, the waste of a lot of slurry is caused at the front end and the rear end due to the adjustment operation, and the slurry remained in the screw last time can only be scrapped;

6. Is not easy to clean:

If the material system is replaced, the screw cavity is thoroughly cleaned. Because the whole screw body is disassembled, more than two days are generally required;

as shown in fig. 12, the surface of the pole piece is provided with conductive agent aggregation (a circle in the figure), and the conductive agent powder which is not infiltrated is arranged in the bulge formed by the aggregation.

Therefore, from the comparison of pole pieces, the refining system has better slurry effect compared with the traditional stirring equipment.

Example 6

Embodiments of a production line having a battery slurry homogenization system of the present invention: the device comprises a powder feeding system 5, a powder weighing system 6, a battery slurry homogenizing system 7, a slurry storage system 8, a slurry conveying spherical pig system 10 and a glue solution metering and conveying system 9 which are shown in fig. 13;

the concrete implementation mode is as follows, powder is put into the powder feeding system 5, the powder is weighed through the powder weighing system 6 and then enters the battery slurry homogenizing system 7, at the moment, the glue solution metering and conveying system 9 is used for filling the glue solution into the battery slurry homogenizing system 7, and after being stirred by the battery slurry homogenizing system 7, the powder enters the slurry storage system 8 and finally enters the slurry conveying spherical pig system 9.

Variations and modifications to the above would be obvious to persons skilled in the art to which the invention pertains from the foregoing description and teachings. Therefore, the invention is not limited to the specific embodiments disclosed and described above, but some modifications and changes of the invention should be also included in the scope of the claims of the invention. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present invention in any way.

Claims (6)

1. A battery slurry homogenization system, including the structure frame, the structure frame sets up at least one holding vessel, its characterized in that: mixing tanks with the same number as the storage tanks are correspondingly arranged below the storage tanks, and dispersing tanks with the same number as the mixing tanks are correspondingly arranged below the mixing tanks;

A storage tank discharge port arranged at the bottom of the storage tank is communicated with a powder feed port arranged at the upper part of the mixing tank, and a mixing discharge port arranged at the lower part of the mixing tank is communicated with a slurry adding port arranged at the upper part of the dispersing tank;

A mixing stirring shaft coaxial with the mixing tank body is horizontally arranged in the mixing tank, the mixing stirring shaft is provided with a spiral mixing stirring blade, and one side of the mixing tank is provided with a first speed reducing motor for driving the mixing stirring shaft to rotate;

The dispersing tank is internally and horizontally provided with a dispersing stirring shaft coaxial with the tank body of the dispersing tank, the dispersing stirring shaft is provided with a spiral dispersing stirring blade, one side of the dispersing tank is provided with a second speed reducing motor for driving the dispersing stirring shaft to rotate, at least two dispersing parts are arranged in the dispersing tank, and the axial direction of each dispersing part is vertical to the axial direction of the spiral dispersing stirring blade;

The spiral strip type mixing stirring blade comprises a mixing outer rotating blade and a mixing inner rotating blade, wherein the mixing outer rotating blade is arranged on a mixing stirring shaft in a manner that stirring slurry moves towards the middle of the tank body, and the mixing inner rotating blade is arranged on the mixing stirring shaft in a manner that stirring slurry moves towards two sides of the tank body;

the spiral type dispersing and stirring blade comprises a dispersing outer propeller and a dispersing inner propeller, the dispersing outer propeller is arranged on a dispersing and stirring shaft in a manner that stirring slurry moves towards the middle of the tank body, and the dispersing inner propeller is arranged on the dispersing and stirring shaft in a manner that stirring slurry moves towards two sides of the tank body;

The mixing outer propeller blade comprises a proximal mixing blade and a distal mixing blade, wherein the proximal mixing blade is arranged on a mixing stirring shaft close to the direction of the first gear motor and comprises proximal blades arranged at intervals;

the distal mixing paddles are arranged on a mixing stirring shaft far away from the direction of the first gear motor and comprise distal paddles which are arranged at intervals;

the structure of the proximal mixing blade is consistent with that of the distal mixing blade, and the rotation directions of the proximal mixing blade and the distal mixing blade are opposite;

the mixing internal rotation paddle comprises a near-end mixing paddle and a far-end mixing paddle, wherein the near-end mixing paddle is arranged on a mixing stirring shaft close to the direction of the first speed reduction motor and comprises two near-end paddles which have the same rotation direction and are in a crossed spiral shape;

The distal mixing paddle is arranged on a mixing stirring shaft far away from the direction of the first gear motor, and comprises two distal paddles which have consistent rotation directions and are in a crossed spiral shape;

The structure of the near-end mixing blade is consistent with that of the far-end mixing blade, and the rotation directions of the near-end mixing blade and the far-end mixing blade are opposite;

the dispersing outer propeller and the dispersing inner propeller are respectively consistent with the structures of the mixing outer propeller blade and the mixing inner propeller blade;

the radial distance between the mixing outer propeller blade and the dispersing outer propeller blade is respectively larger than the radial distance between the mixing inner propeller blade and the dispersing inner propeller blade; the clearance between any point on the outer edges of the mixing outer propeller blades and the dispersing outer propeller blades and the inner walls of the mixing tank and the dispersing tank is 1-10 mm respectively.

2. The battery slurry homogenization system of claim 1, wherein: the structure frame is provided with two storage tanks, two mixing tanks and two dispersing tanks side by side to form two parallel-connected homogenizing systems, and the two homogenizing systems are crossed or synchronously operated so as to realize continuous or intermittent slurry production.

3. The battery slurry homogenization system of claim 1 or 2, wherein: the slurry adding device is characterized in that two dispersing parts are arranged at the upper end of a dispersing tank around the slurry adding port, each dispersing part comprises a dispersing motor, a dispersing motor seat, a dispersing shaft and a dispersing disc, the lower end of the dispersing motor seat is fixedly connected with the dispersing tank, the dispersing motor is arranged at the upper end of the dispersing motor seat, the output end of the dispersing motor is connected with the dispersing shaft, the dispersing shaft penetrates through the dispersing motor seat to extend into the dispersing tank, the dispersing disc is arranged at the lower end of the dispersing shaft, the dispersing shaft is in sealing connection with the dispersing motor seat, and the dispersing disc rotates in the dispersing tank under the driving of the dispersing motor.

4. The battery slurry homogenization system of claim 3, wherein: two after stretching into the dispersion jar inside, be located respectively dispersion stirring axle's both sides, two dispersion dish all is located dispersion jar inside of dispersion stirring axle below.

5. The battery slurry homogenization system of claim 1 or 2, wherein: the inner walls of the mixing tank and the dispersing tank are coated with Teflon, and the surfaces of the spiral mixing stirring blades and the spiral dispersing stirring blades are coated with Teflon.

6. A process flow of a battery slurry homogenization system according to claim 1 or 2, characterized in that the process flow of a battery slurry homogenization system comprises the steps of:

Firstly, stirring dry powder, namely putting the powder in a storage tank into a mixing tank, synchronously rotating a mixing stirring shaft when the powder enters the mixing tank, uniformly mixing a plurality of powder, and continuously stirring in the state;

Step two, stirring with high viscosity, adding part of colloid into a mixing tank, synchronously rotating a mixing stirring shaft when the colloid is added into the mixing tank, stirring the powder and the colloid in the mixing tank to be in a high-viscosity mud state, and continuously stirring in the state;

step three, diluting and stirring, namely adding the rest colloid into a mixing tank, synchronously rotating a mixing stirring shaft when the colloid is added into the mixing tank, stirring the high-viscosity slurry in the mixing tank to be diluted, and continuously stirring in the state;

Step four, transferring the slurry, vacuumizing a dispersion tank, adding positive pressure into the mixing tank, rapidly conveying the slurry from the mixing tank to the dispersion tank, adding liquid into the mixing tank for flushing after the slurry is conveyed, and enabling the flushed liquid to enter the dispersion tank;

Step five, dispersing and stirring, wherein the dispersing tank disperses and stirs the slurry through rotation of a dispersing and stirring shaft until the slurry meets the requirements, and then the slurry enters the next working procedure.