CN222677727U - Lithium battery slurry mixing equipment and coating system - Google Patents

Abstract

The utility model discloses lithium battery slurry mixing equipment and a coating system, which belong to the field of lithium battery manufacturing, and comprise a powder storage system for storing powder materials, a fluid storage system for storing fluid slurry, a homogenizing tank for receiving and mixing the powder materials and the fluid slurry, wherein at least one pair of circulating pipeline holes are formed in the homogenizing tank, circulating pipelines communicated with the corresponding circulating pipeline holes are arranged outside the homogenizing tank, and a viscometer for detecting the viscosity of the slurry is arranged in a circulating path of the circulating pipeline. When the slurry is uniformly mixed, the discharge port is closed, the viscosity of the slurry is measured by the viscometer when the slurry passes through the circulating pipeline, and when the viscosity does not reach the standard, the quantity of the powder material or the liquid slurry conveyed to the homogenizing tank is controlled, so that the viscosity of the slurry is adjusted, and when the viscosity of the slurry reaches the standard, the circulating pipeline hole is closed, and the mixed slurry is discharged through the discharge port.

Description

Lithium battery slurry mixing equipment and coating system

Technical Field

The utility model relates to the field of lithium battery manufacturing, in particular to lithium battery slurry mixing equipment and a coating system.

Background

Lithium batteries are one of the most widely used batteries at present, and have the advantages of high energy density, long life, and low self-discharge rate. The first procedure of lithium battery production makes the homogenate, the homogenate is to mix the active material with binder, conductive agent and so on through homogenate technology to form the slurry with good dispersion uniformity and stability, the quality of the slurry directly affects the performance of the battery, 70% of the lithium battery performance is seen as a slice in the industry, and 70% of the slice is seen as homogenate.

The prior art in-industry homogenizing method mainly comprises double-planet homogenizing and double-screw homogenizing, wherein the former is named as the planetary which runs around a star, the former is composed of a low-speed stirring component and a high-speed dispersing component which are formed by 2 bending frame type stirring, the running track is accurate, the homogenizing effect is good, the process maturity is high, but the dispersing effect on small-particle-size lithium iron phosphate materials, conductive carbon black with larger specific surface area and the like is poor, the high-speed dispersing machine is required to be matched, the homogenizing process time factory is high in energy consumption, the large-batch continuous production cannot be met, the two screws of the latter are meshed, the relative screw sleeve surface materials are cleaned during working, the self-cleaning function is realized, the residual materials in the double-screw pulping machine are kept at a lower level, the discharging speed of the materials is improved while the cleaning pressure is reduced, but the manufacturing process is high in cost, the large-size dispersing effect is required to be produced by matching with a large amount of stirring tanks, the occupied area is high, the energy consumption is high, the surface of the screw and the inner wall of the cavity is easy to cause the risk of high, and the standard metal foreign material in-grade metal foreign material is influenced, and the safety performance is influenced.

Therefore, the above two main homogenization methods in the industry cannot meet the requirement of mass continuous production, in order to improve the homogenization efficiency in the prior art, powder materials and fluid slurry are often premixed and then stirred for homogenization, but the viscosity of the slurry is difficult to control in the process, so that the final coating effect is affected.

Disclosure of utility model

The utility model aims to provide a lithium battery slurry mixing device and a coating system, which solve the problem that the viscosity of slurry is difficult to control in a mode of premixing powder materials and fluid slurry and then homogenizing in the prior art, so that the final coating effect is affected.

In order to achieve the above purpose, the utility model provides lithium battery slurry mixing equipment, which comprises a powder storage system for storing powder materials, a fluid storage system for storing fluid slurry, a slurry tank for receiving and mixing the powder materials and the fluid slurry, at least one pair of circulating pipeline holes are formed in the slurry tank, circulating pipelines communicated with the corresponding circulating pipeline holes are arranged outside the slurry tank, a viscometer for detecting the viscosity of the slurry is arranged in a circulating path of the circulating pipeline, the input of the powder materials and the fluid slurry into the slurry tank is controlled according to the viscosity of the slurry, and a discharge port is further arranged on the slurry tank.

Further, the powder storage system comprises at least one centrifugal tank which is arranged on the same horizontal direction with the homogenizing tank, the centrifugal tank is communicated with the homogenizing tank through a negative pressure pipeline, and the fluid storage system comprises at least one liquid tank which is arranged above the homogenizing tank and is communicated with the homogenizing tank through a fluid pipeline. Specifically, a liquid flow valve for controlling the flow of the fluid slurry is arranged on the fluid pipeline.

Preferably, the powder storage system further comprises at least one powder tank communicated with the centrifugal tank through a powder pipeline, and a powder flow valve for controlling the flow of powder materials is arranged on the powder pipeline.

In one possible implementation mode, a centrifugal bin for receiving and stirring the powder material is sleeved in the centrifugal tank, a powder containing cavity for containing the premixed powder material is formed between the centrifugal bin and the centrifugal tank, the centrifugal bin is driven to rotate by a driving mechanism, and a plurality of small holes are formed in the centrifugal bin and used for conveying the mixed and dispersed powder material to the powder containing cavity through the small holes.

Preferably, the middle part of the inner wall of the powder accommodating cavity formed by the centrifugal tank is of a cylindrical structure, the upper part and the lower part are of conical structures, and the lower part of the conical structure is provided with a hole which is connected with the negative pressure pipeline.

Preferably, a first motor is arranged above the centrifugal tank, the first motor is in driving connection with a rotating shaft in rotating connection with the centrifugal bin, and a dispersing paddle is arranged on the rotating shaft.

Preferably, a second motor for driving the centrifugal bin to rotate is arranged below the centrifugal tank, a rotating shaft of the second motor is rotationally connected with the centrifugal tank through a bearing, and a brake pad for controlling the centrifugal bin to brake is arranged below the bearing.

Preferably, a third motor is arranged above the homogenizing tank, the third motor is in driving connection with a stirring shaft, and stirring paddles and a dispersing disc are arranged on the stirring shaft.

The utility model also provides a coating system which comprises the coating buffer tank and the lithium battery slurry mixing equipment, wherein the coating buffer tank is used for receiving the mixed slurry with qualified viscosity in the homogenizing tank.

Compared with the prior art, the technical proposal provided by the utility model has the following steps

The beneficial effects are that:

The lithium battery slurry mixing equipment of the utility model respectively pre-mixes the powder material and the fluid slurry before stirring and homogenizing the powder material and the fluid slurry, can greatly save the homogenizing time and reduce the energy consumption of the equipment, and more importantly, because the powder material and the fluid slurry are separately conveyed, the viscosity of the slurry cannot be controlled after being uniformly mixed, thereby influencing the final coating effect, the utility model is provided with the circulating pipeline and the viscometer, when the slurry is uniformly mixed, the discharge hole is firstly closed, when the slurry passes through the circulating pipeline, the viscosity of the slurry is measured by the viscometer, when the viscosity does not reach the standard, the quantity of the powder material or the liquid slurry conveyed to the homogenizing tank is controlled, so that the viscosity of the slurry is regulated, when the viscosity of the slurry reaches the standard, the hole of the circulating pipeline is closed, and the mixed slurry is discharged through the discharge hole.

In addition, in the utility model, the centrifugal tank and the homogenizing tank in the powder storage system are arranged in the same horizontal direction, and the liquid tank in the fluid storage system is arranged above the homogenizing tank, so that the overall layout of the system is more compact and reasonable, the occupied area is reduced, and the system can be used for carrying out circulating uninterrupted production, thereby improving the productivity and shortening the whole trial production period.

It is apparent that the elements or features described in the above single embodiment may be used alone or in combination in other embodiments.

Drawings

In the drawings, the dimensions and proportions are not representative of the dimensions and proportions of an actual product. The figures are merely illustrative and certain unnecessary elements or features have been omitted for clarity.

Fig. 1 is a schematic diagram of the overall structure of a lithium battery slurry mixing device according to embodiment 1 of the present utility model;

FIG. 2 is a schematic view showing the structure of a centrifugal cartridge in example 1 of the present utility model;

Fig. 3 is a flow chart of embodiment 1 of the present utility model.

Description of the reference numerals

10. Powder storage system, 11, active material tank, 12, conductive agent tank, 13, additive tank, 14, powder standby tank, 15, powder pipeline, 16, powder flow valve, 20, centrifugal tank, 21, first motor, 22, rotating shaft, 23, dispersing paddle, 24, feeding nozzle, 25, negative pressure pipeline, 26, centrifugal bin, 27, second motor, 28, bearing, 29, brake pad, 30, fluid storage system, 31, solvent tank, 32, glue tank, 33, conductive slurry tank, 34, liquid standby tank, 35, fluid pipeline, 36, liquid flow valve, 40, homogenizing tank, 41, third motor, 42, stirring paddle, 43, dispersing disc, 44, circulating pipeline hole, 45, discharging hole, 46, discharging pipeline, 47, circulating pipeline, 48, viscosimeter.

Detailed Description

The present utility model will be described in detail below with reference to the accompanying drawings. What has been described herein is merely a preferred embodiment according to the present utility model, and other ways of implementing the utility model will occur to those skilled in the art on the basis of the preferred embodiment, and are within the scope of the utility model.

Example 1

The embodiment provides a lithium battery slurry mixing device to solve the problem that in the prior art, the viscosity of slurry is difficult to control in a mode of homogenizing powder materials and fluid slurry after premixing, so that the final coating effect is affected.

Specifically, a lithium battery slurry mixing device comprises a powder storage system 10 for storing powder materials, a fluid storage system 30 for storing fluid slurry, and a homogenizing tank 40 for receiving and mixing the powder materials and the fluid slurry.

The powder storage system 10 comprises at least one centrifugal tank 20 which is arranged in the same horizontal direction with the homogenizing tank 40, the centrifugal tank 20 is communicated with the homogenizing tank 40 through a negative pressure pipeline 25, the powder storage system further comprises at least one powder tank which is communicated with the centrifugal tank 20 through a powder pipeline 15, and the powder pipeline 15 is provided with a powder flow valve 16 for controlling the flow of powder materials.

In some possible embodiments, the powder tanks can be multiple to store different powder materials separately, and specifically, the powder tank can comprise an active material tank 11, a conductive agent tank 12, a binder tank and an additive tank 13, wherein the volume of the active material tank 11 is about 200L, a cover is arranged on the upper part of the tank body, a feeding hole is arranged on the cover, the volume of the conductive agent tank 12, the binder tank and the additive tank 13 is about 1/10 of the volume of the active material tank 11, and the upper part of each tank body is provided with a cover, and the cover is provided with a feeding hole. The powder tank may be communicated with the centrifugal tank 20 through a powder pipe 15, and a powder flow valve 16 for controlling the flow rate of the powder material is provided on the powder pipe 15, so that the addition amount and the addition rate of the powder material can be controlled. The upper parts of the active material tank 11, the conductive agent tank 12, the binder tank, the additive tank 13 and other powder tanks are cylindrical, the lower parts are conical, and the powder pipelines 15 are arranged below the conical parts.

The active material tank 11, the conductive agent tank 12 and the additive tank 13 in the powder storage system 10 are continuously fed, which can be manual or mechanical automatic feeding, preferably adopts mechanical automatic feeding, the powder enters the tank body through a feeding hole at the upper part of the tank body, when the ratio of each powder reaches 1/2 of the volume of each tank body, a powder flow valve 16 of the powder storage system 10 is opened, the powder uniformly and quantitatively drops to a centrifugal tank 20, and the opening and closing degree of the powder flow valve 16 corresponding to each tank body is different due to different material content in the slurry system, so that the content proportion of different powder in unit time is controlled to be consistent, uniform mixing of the powder is facilitated, each powder enters the centrifugal tank 20 through different powder pipelines 15 connected between the powder storage system 10 and the centrifugal tank 20, the powder flow valve 16 is arranged at one end of the powder pipeline 15 close to the centrifugal tank 20, the active material tank 11 stores ternary, lithium iron phosphate, lithium manganese iron, sodium iron, lithium, cobalt titanate, lithium, one kind of lithium, or a black or a plurality of additives in the conductive tank 12-13, a special additive in the powder storage system, an LFO(s) is provided in the storage tank 10, an LFO (liquid-13) or a special powder storage system, and an LFO (liquid storage system) is provided in the storage tank 13, and the requirements of the additive are met.

In some possible embodiments, the centrifugal tank 20 is sleeved with a centrifugal bin 26 for receiving and stirring the powder material, a powder containing cavity for containing the premixed powder material is formed between the centrifugal bin 26 and the centrifugal tank 20, the centrifugal bin 26 is driven to rotate by a driving mechanism, and a plurality of small holes are formed in the centrifugal bin 26 and used for conveying the mixed and dispersed powder material to the powder containing cavity through the small holes, as shown in fig. 2.

Specifically, the middle part of the centrifugal tank 20 is of a cylindrical structure, the upper part of the centrifugal tank is of a conical structure, the upper part of the centrifugal tank is used as a tank cover, a first motor 21 is installed in a central opening, a rotating shaft 22 which is connected with a centrifugal bin 26 in a driving mode is arranged below the first motor 21, a dispersing paddle 23 is installed on the rotating shaft 22 and used for dispersing powder in the falling process, a plurality of small holes are formed in the periphery of the first motor 21 and are used for being connected with powder pipelines 15 of different powder storage systems 10, the lower part of the centrifugal tank is integrally cast with the middle cylinder, the inner connecting part of the lower part of the centrifugal tank is in arc transition, dead angles in the centrifugal tank 20 are avoided, the lower part of the centrifugal tank is provided with a hole and used for being connected with a negative pressure pipeline 25, in addition, a second motor 27 which is used for driving the centrifugal bin 26 to rotate is arranged below the centrifugal tank 20, and a rotating shaft of the second motor 27 is connected with the centrifugal tank 20 in a rotating mode through a bearing 28, and a brake pad 29 used for controlling braking of the centrifugal bin 26 is arranged below the bearing 28.

In other possible embodiments, the fluid storage system 30 includes at least one liquid tank disposed above the homogenization tank 40, the liquid tank being in communication with the homogenization tank 40 through the fluid conduit 35. The liquid tanks can be multiple to accommodate different fluid materials, and specifically can comprise a solvent tank 31, a glue tank 32, a conductive paste tank 33 and a standby tank 14, wherein the volumes of the solvent tank 31 and the glue tank 32 are about 200L, the upper part of the tank body is provided with a cover, the cover is provided with a feeding hole, the volumes of the conductive paste tank 33 and the powder standby tank 14 are about 50L, the upper part of each tank body is provided with a cover, the cover is provided with a feeding hole, the upper parts of the solvent tank 31, the glue tank 32, the conductive paste tank 33 and the standby tank 14 are cylindrical, the lower parts are conical, the lower parts of the conical parts are provided with fluid pipelines 35, and the fluid pipelines 35 are provided with liquid flow valves 36 to control the flow of the fluid paste. Whether the solvent tank 31 is opened or not is determined by whether the slurry needs to be adjusted in viscosity, and at least one liquid reserve tank 34 is provided for use of liquid additives for other special functions.

In the above embodiment, the centrifugal tank 20 and the homogenizing tank 40 in the powder storage system 10 are arranged in the same horizontal direction, and the liquid tank in the fluid storage system 30 is arranged above the homogenizing tank 40, so that the overall layout of the system is more compact and reasonable, the occupied area is reduced, and the system can be produced circularly and uninterruptedly, the productivity is improved, and the whole trial production period is shortened.

In this embodiment, at least one pair of circulation pipe holes 44 are provided in the homogenization tank 40, a circulation pipe 47 communicating with the corresponding circulation pipe hole 44 is provided outside the homogenization tank 40, a viscometer 48 for detecting the viscosity of the slurry is provided in the circulation path of the circulation pipe 47, the input of the powder material and the fluid slurry into the homogenization tank 40 is controlled according to the viscosity of the slurry, and a discharge port is provided in the homogenization tank 40. The discharge port specifically comprises a discharge hole 45 arranged at the bottom of the homogenization tank 40, and the discharge hole 45 is connected with a discharge pipeline 46.

Specifically, a pair of circulation pipe holes 44 may be formed in the homogenization tank 40, one circulation pipe hole 44 being formed in the bottom of the homogenization tank 40, and the other circulation pipe hole 44 being formed in the upper feed inlet of the homogenization tank 40.

In some possible embodiments, a negative pressure pipeline 25 interface is arranged above the homogenizing tank 40, powder after being uniformly mixed in the centrifugal tank 20 enters the homogenizing tank 40 through the negative pressure pipeline 25, small holes are formed in the cover of the homogenizing tank 40 and are used for connecting pipelines of different fluid storage systems 30, a third motor 41 is arranged in the center of the cover, the third motor 41 is in driving connection with a stirring shaft, and stirring paddles 42 and a dispersing disc 43 are arranged on the stirring shaft and are used for kneading and dispersing slurry.

Referring to fig. 1 and 3, when the embodiment is applied, different powder arrives at a centrifugal tank 20 through a powder pipeline 15, one side of a small hole on a tank cover is connected with a pipeline, one side is connected with a feeding nozzle 24, the powder enters a centrifugal tank 26 through the feeding nozzle 24, a first motor 21 arranged on the tank cover of the centrifugal tank 20 is started, a rotating shaft 22 drives a dispersing paddle 23 to rotate clockwise for dispersing the powder in falling, a second motor 27 is started, the centrifugal tank 26 is driven by a bearing 28 to rotate anticlockwise, the powder is uniformly dispersed in the centrifugal tank 26, the mixed and dispersed powder enters a powder accommodating cavity in the centrifugal tank 20 from small holes on the tank wall of the centrifugal tank 26, a negative pressure pipeline 25 is in a continuous open state, the powder enters a homogenizing tank 40 through the negative pressure pipeline 25 after entering the powder accommodating cavity, a liquid tank 32 which is completed after being fed, a liquid flow valve 36 arranged on a liquid pipeline 35 below the conducting slurry tank 33 is opened, and the liquid slurry is input into the homogenizing tank 40.

Powder passes through the negative pressure pipeline 25, fluid passes through the fluid pipeline 35 and quantitatively enters the homogenizing tank 40 according to the proportion, the third motor 41 drives the stirring paddles 42 and the dispersing discs 43 in the interior to continuously rotate through the stirring shaft to knead and disperse the powder and the fluid, the discharge holes 45 are in a closed state during homogenizing, the circulating pipeline holes 44 are in an open state, the viscosity of the slurry is measured in real time by the viscometer 48, the slurry continuously circulates in the circulating pipeline 47 when the viscosity is unqualified, the slurry is dispersed and stirred for a plurality of times through the homogenizing tank 40 until the viscosity is qualified, the circulating pipeline holes 44 are closed after the viscosity of the slurry meets the process requirement, the discharge holes 45 are opened, and the slurry is conveyed to a coating system for coating.

Example 2

The present embodiment also provides a coating system, which includes a coating buffer tank, and further includes the lithium battery slurry mixing device in embodiment 1, where the coating buffer tank is configured to receive the mixed slurry with acceptable viscosity in the homogenizing tank 40.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated in terms of "front", "rear", "left", "right", "upper", "lower", "top", "bottom", "inner", "outer", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The scope of protection of the utility model is limited only by the claims. Those skilled in the art, having the benefit of the teachings of this utility model, will readily recognize alternative constructions to the disclosed structure as viable alternative embodiments, and the disclosed embodiments may be combined to create new embodiments that fall within the scope of the appended claims.

Claims (10)

1. The utility model provides a lithium cell closes thick liquid equipment, includes powder storage system (10) that are used for storing powder material and is used for storing fluid slurry's fluid storage system (30), still includes homogenate jar (40) that are used for receiving and mixing powder material and fluid slurry, its characterized in that, set up at least a pair of circulation pipeline hole (44) on homogenate jar (40) to be provided with circulation pipeline (47) that the intercommunication corresponds circulation pipeline hole (44) in homogenate jar (40) outside, be provided with in the circulation route of circulation pipeline (47) and be used for detecting thick liquid viscosity's viscometer (48), be used for according to the input of thick liquid viscosity control powder material and fluid slurry to in homogenate jar (40), still be provided with the discharge gate on homogenate jar (40).

2. The lithium battery slurry mixing device according to claim 1, wherein the powder storage system (10) comprises at least one centrifugal tank (20) arranged in the same horizontal direction as the homogenizing tank (40), the centrifugal tank (20) is communicated with the homogenizing tank (40) through a negative pressure pipeline (25), and the fluid storage system (30) comprises at least one liquid tank arranged above the homogenizing tank (40), and the liquid tank is communicated with the homogenizing tank (40) through a fluid pipeline (35).

3. The lithium battery slurry mixing device according to claim 2, wherein a liquid flow valve (36) for controlling the flow of the fluid slurry is arranged on the fluid pipeline (35).

4. The lithium battery slurry mixing device according to claim 2, wherein the powder storage system (10) further comprises at least one powder tank communicated with the centrifugal tank (20) through a powder pipeline (15), and a powder flow valve (16) for controlling the flow of powder material is arranged on the powder pipeline (15).

5. The lithium battery slurry mixing device according to claim 2, wherein a centrifugal bin (26) for receiving and stirring the powder material is sleeved in the centrifugal tank (20), a powder accommodating cavity for accommodating the premixed powder material is formed between the centrifugal bin (26) and the centrifugal tank (20), the centrifugal bin (26) is driven to rotate by a driving mechanism, and a plurality of small holes are formed in the centrifugal bin (26) and used for conveying the mixed and dispersed powder material to the powder accommodating cavity through the small holes.

6. The lithium battery slurry mixing device according to claim 5, wherein the middle part of the inner wall of the powder accommodating cavity formed by the centrifugal tank (20) is of a cylindrical structure, the upper part and the lower part are of a conical structure, and an opening below the conical structure of the lower part is connected with the negative pressure pipeline (25).

7. The lithium battery slurry mixing device according to claim 5, wherein a first motor (21) is arranged above the centrifugal tank (20), the first motor (21) is in driving connection with a rotating shaft (22) rotatably connected with the centrifugal bin (26), and a dispersing paddle (23) is arranged on the rotating shaft (22).

8. The lithium battery slurry mixing device according to claim 5, wherein a second motor (27) for driving the centrifugal bin (26) to rotate is arranged below the centrifugal tank (20), a rotating shaft of the second motor (27) is rotationally connected with the centrifugal tank (20) through a bearing (28), and a brake pad (29) for controlling the centrifugal bin (26) to brake is arranged below the bearing (28).

9. The lithium battery slurry mixing device according to any one of claims 1 to 8, wherein a third motor (41) is arranged above the slurry homogenizing tank (40), the third motor (41) is in driving connection with a stirring shaft, and stirring paddles (42) and a dispersing disc (43) are arranged on the stirring shaft.

10. A coating system comprising a coating buffer tank, and further comprising a lithium battery paste mixing device according to any one of claims 1-9, wherein the coating buffer tank is configured to receive a mixed paste of acceptable viscosity in a homogenization tank (40).