CN115301114B

CN115301114B - Stirring device for lithium ion battery slurry

Info

Publication number: CN115301114B
Application number: CN202210928337.3A
Authority: CN
Inventors: 吴明珠; 高峰; 张要枫; 赵冬梅; 赵辉
Original assignee: Hubei Titanium Era New Energy Co Ltd
Current assignee: Hubei Titanium Era New Energy Co Ltd
Priority date: 2022-08-03
Filing date: 2022-08-03
Publication date: 2023-07-28
Anticipated expiration: 2042-08-03
Also published as: CN115301114A

Abstract

The application discloses a stirring device for lithium ion battery slurry. This agitating unit, when needs get into jar chamber to the stirring of battery thick liquids, battery thick liquids just are acted on by the feed inlet after reentrant jar chamber by the feed divider, by dispersing into tiny oar material flow, can disperse around stirring paddle like this, avoided getting into the thick liquids of jar chamber too big and produce too big vortex when being stirred by stirring paddle, avoided this too big vortex can make the shape of local thick liquids flow too stable and be difficult to be stirred to appear local inhomogeneity, improved the homogeneity of stirring.

Description

Stirring device for lithium ion battery slurry

Technical Field

The application relates to the technical field of lithium battery slurry production equipment, in particular to a stirring device for lithium ion battery slurry.

Background

The production process of the lithium battery is complex, and the main production process flow mainly comprises stirring, coating, rolling, slitting (front section) winding, welding, liquid injection, formation and capacity separation (rear section). With the development of science and technology, the energy consumption is greatly increased, so that people are required to create a new energy source with high efficiency, high quality and high performance. Agitation is a very important process in battery production and can directly affect the performance of the battery.

In the related art, stirring of lithium battery slurry is not uniform enough.

Disclosure of Invention

In view of this, the present application provides a stirring device for lithium ion battery slurry, which can improve stirring uniformity.

The application provides a agitating unit of lithium ion battery thick liquids, include:

the stirring tank is provided with a tank cavity for accommodating battery slurry, and the tank cavity is communicated with a feed inlet and a discharge outlet;

a stirring blade extending into the tank cavity;

and a distributing tray which is arranged in the tank cavity and is close to the feeding port, wherein the distributing tray is configured to be capable of moving up and down relative to the stirring tank.

Optionally, the material distributing disc comprises a disc seat and a conical disc body, wherein the disc body is rotatably arranged on the disc seat, and the disc seat is used for being driven by external force in a lifting manner.

Optionally, a plurality of ribs are convexly arranged on the tray body.

Optionally, the extending direction of the disc ribs is along the radial direction of the disc body.

Optionally, the disc rib is provided with a rib groove extending along the width direction thereof.

Optionally, a push-pull rod is arranged on the wall of the stirring tank and is pushed and pulled by external force.

Optionally, an observation port is formed in the tank wall of the stirring tank.

Optionally, a charging hole is formed in the tank wall of the stirring tank.

Optionally, the feeding port is communicated with a feeding mechanism.

The stirring device for the lithium ion battery slurry provided by the above is capable of dispersing the battery slurry into fine slurry flows by being acted by the material distribution disc after entering the tank cavity when the battery slurry is required to be stirred, so that the slurry entering the tank cavity is prevented from being excessively large and generating excessive vortex when being stirred by the stirring blade, the excessive vortex is prevented from causing the shape of local slurry flow to be excessively stable and difficult to be stirred, and the local non-uniformity is avoided, and the stirring uniformity is improved.

Drawings

Technical solutions and other advantageous effects of the present application will be made apparent from the following detailed description of specific embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a view angle of a stirring device according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a stirring tank according to an embodiment of the present application.

Fig. 3 is a schematic structural view of another view of the stirring device according to the embodiment of the present application.

Wherein, the elements in the figure are identified as follows:

1-a stirring tank; 2-fixing the assembly; 3-a push-pull rod; 4-a discharge control valve; 5, a discharge hole; 6-a material distributing disc; 7-a stirrer cover; 8-stirring paddles; 9-a feed pipe 10-a feed mechanism; 11-a feed control valve; 12, 14-viewing port; 13-a charging port.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.

Before introducing the technical solutions of the present application, it is necessary to set forth the created background of the invention of the present application.

It is already common in the related art to improve the stirring uniformity of the battery slurry, and it is generally focused on a specific structural design of the stirring blade. The structural design of the stirring blade is very limited in improving the stirring uniformity.

Regarding the reason why the structural design of the stirring blade has limited improvement of stirring uniformity, the inventor has found that the root of the limitation of stirring uniformity is that the slurry generally has a large flow rate when entering the tank cavity after very difficult exploration and analysis. When the slurry with the excessive flow rate enters the action range of the stirring blade, the slurry can violently impact the stirring blade, and under the rotation action of the stirring blade, the impact strength of the slurry by the stirring blade is enhanced, so that turbulent vortex is generated. The turbulence may overstabilize the shape of the local slurry flow with the advantage and disadvantage that the flow range of the slurry as a whole may be accelerated to some extent. However, the disadvantage is quite pronounced, the nature of the vortex being a manifestation of the internal and external pressure differences, i.e. the pressure outside the vortex will be greater than the pressure inside the vortex, and the pressure differences will cause the local slurry flow (which may be understood as a slurry aggregate with directional movement) to maintain its inherent shape stability, which is less likely to be dispersed by external forces and difficult to break up, thereby creating local non-uniformities.

Reducing the feed flow rate of the slurry appears to be the most direct powerful means for the formation of the vortex described above, but the feed flow of the slurry is a very important aspect with respect to the overall operating efficiency of the stirring device. From this point of view, it appears that "end-up-upside-down" is not desirable to sacrifice overall stirring efficiency.

Based on the above-mentioned problem, the inventors propose a stirring device for lithium ion battery slurry, when the battery slurry needs to be stirred, the battery slurry enters a tank cavity from a feed inlet and then is acted by a material separating disc after entering the tank cavity, and is dispersed into fine slurry flow, so that the slurry entering the tank cavity can be dispersed around a stirring blade, and the excessive vortex generated when the slurry entering the tank cavity is stirred by the stirring blade is avoided, and the excessive vortex can be avoided to make the shape of local slurry flow be too stable and difficult to be stirred, thereby avoiding local non-uniformity and improving the uniformity of stirring. Thus, the present invention has been created.

Referring to fig. 1-3, an embodiment of the present application provides a stirring device for lithium ion battery slurry, including:

a stirring tank 1, which is provided with a tank cavity for containing battery slurry, wherein the tank cavity is communicated with a feed inlet and a discharge outlet 5;

a stirring blade 8 extending into the tank cavity;

and a distributing tray 6 disposed in the tank chamber and close to the inlet, wherein the distributing tray 6 is configured to be movable up and down with respect to the stirring tank 1.

The above-described "the distributing tray 6 is configured to be movable up and down with respect to the agitation tank 1" is designed for the purpose of: the distance of the separating discs 6 relative to the stirring blades 8 at the level of the stirring tank 1 can be adjusted so that the separating discs 6 remain at a suitable distance. The excessive spacing is avoided, so that the fed slurry is thoroughly stationary before reaching the stirring blade 8, and the possibility of sedimentation of the slurry after feeding is increased; meanwhile, the phenomenon that the interval is too small, slurry after feeding is impacted on the stirring blade 8 at an increased flow speed is avoided, and the risk of vortex generation is increased.

It should be appreciated that the relevant transmission mechanism for driving the dispensing tray 6 may be a linear motion mechanism, such as a telescopic rod, a telescopic sleeve cooperating assembly, or a slide rail, a chute cooperating assembly, etc.

The external force source to which the tray 6 is driven may be manual, but may be an electric push rod, a pneumatic push rod, or the like, or any other conceivable means.

As an exemplary implementation of the structure or shape of the tray 6, the tray 6 includes a tray seat and a tapered tray body, the tray body is rotatably mounted on the tray seat, and the tray seat is driven to be lifted by an external force.

Thus, after the slurry enters the tank cavity, the conical disc body rotates to generate relative motion relative to the slurry entering direction, and the conical pointed shape is utilized to generate cutting action on the slurry flow to be scattered, so that the material separating effect is enhanced.

Here, the tray may be a plate-like body and a rotation shaft located on the plate-like body. The disc is sleeved on the rotating shaft, and is installed on the rotating shaft through a shaft sleeve or a bearing.

In a typical embodiment, the tray body is provided with a plurality of ribs in a protruding manner.

Therefore, the cutting effect of the disc body on the entering slurry flow can be enhanced through the disc ribs.

The disc ribs can be in a strip shape with a square section or an arc-shaped strip shape.

As an exemplary implementation of the arrangement direction of the disc ribs, the extending direction of the disc ribs is along the radial direction of the disc body.

Therefore, the slurry flow entering the tank cavity can be ensured to impact the slurry flow in a posture perpendicular to the flow direction of the slurry flow, so that the impact strength on the slurry flow is higher, and a better material distributing effect is obtained.

In a typical embodiment, the disc ribs are provided with grooves extending in the width direction thereof.

Therefore, through the arrangement of the rib grooves, when the slurry flow entering the tank cavity is impacted by the disc ribs, the slurry flow is not totally rebounded, but part of the slurry flow can basically flow along the entering flow direction, and the turbulence of the slurry flow is reduced.

The stirring tank 1 is opened at one end and is covered with a stirrer cover 7. The stirring blade passes through the stirrer cover 7 and finally protrudes into the tank space in the stirring tank 1. The bottom of the tank wall of the stirring tank 1 is provided with a discharge hole, four corners of the stirring tank 1 are respectively provided with a fixing device, and the tank wall of the stirring tank 1 is provided with a fixing rod which can be pushed and pulled.

The outer surface of the stirring tank 1 can be provided with small observation ports 12,14 and a charging port 13 along the left and right, and the charging port is communicated with a feeding mechanism 10 capable of continuously feeding. The feeding mechanism 10 is provided with a feeding control valve 11.

The feeding mechanism 10 is communicated with a feeding pipe 9, and the feeding pipe 9 is communicated with a feeding hole.

The tank wall bottom discharge port 5 of the stirring tank 1 is convenient for cleaning the stirring tank 1 and discharging. The discharge port 5 is provided with a discharge control valve 4.

The four corners of the stirring tank 1 are respectively provided with a fixing component 2, so that the stirring tank 1 is fixed, and friction between the stirrer cover 7 and the inner wall of the stirring tank 1 is avoided.

The tank wall of the stirring tank 1 is provided with a push-pull rod 3 which can be pushed and pulled, so that the stirring tank 1 is convenient to push and pull.

The tank wall is provided with small observation openings 12 and 14 and a charging opening 13 at the left and right sides, the observation openings 12 and 14 are used for conveniently observing the stirring state of materials, and the charging opening 13 is used for avoiding opening the stirrer cover 7 and avoiding excessive air from entering.

The operation of the stirring of the present application will now be described with respect to one common application scenario. It should be noted that this common embodiment is not to be taken as a basis for understanding the essential characteristics of the technical problem to be solved by the claims of the present application, which are merely exemplary.

The stirring device for the lithium ion battery slurry is characterized in that when the lithium ion battery slurry is used for feeding, the stirring of the positive electrode is taken as an example, and the stirring of the positive electrode slurry is carried out: firstly, preparing glue solution, firstly adding NMP, setting stirring revolution and dispersion speed, and running for a long time. Then adding the binder, adding the binder in two times, setting stirring revolution and dispersion speed, and running the mixer for a long time, and stirring the binder in two times, wherein the stirring steps are the same. Then scraping materials, and scraping powder and caking on the stirring rod and the wall of the stirrer. Then setting stirring revolution and dispersing speed, stirring time period and vacuumizing. Then preparing slurry, starting circulating water, adding conductive agent, adding the conductive agent twice, setting stirring revolution and dispersion speed, running stirring time, stirring twice, stirring the materials in the same steps, and scraping the materials, and cleaning the stirring rod, powder on the wall of the stirrer and caking. Adding a positive main body material (ternary material, lithium manganate, lithium cobaltate and lithium iron phosphate) at two times, setting stirring revolution and dispersion speed, running for a long time, stirring twice, stirring the materials in the same step, scraping materials, and scraping powder and caking on a stirring rod and a stirring machine wall. Then setting stirring revolution and dispersing speed, stirring time period and vacuumizing.

The foregoing is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present application should be covered by the scope of the present application.

Claims

1. A stirring device for lithium ion battery slurry, comprising:

a stirring blade extending into the tank cavity;

the material distributing disc is arranged in the tank cavity and close to the feeding hole, and the material distributing disc is configured to be capable of moving up and down relative to the stirring tank;

the tray comprises a tray seat and a conical tray body, the tray body is rotatably arranged on the tray seat, and the tray seat is used for being driven by external force in a lifting manner so as to adjust the distance between the tray and the stirring blade at the height of the stirring tank, so that the tray is kept at a preset distance, the excessive distance is avoided, the fed slurry is thoroughly static before reaching the stirring blade, and the possibility of sedimentation of the slurry after feeding is increased; meanwhile, the phenomenon that the gap is too small, so that the fed slurry impacts the stirring blade at an increased flow speed is avoided, and the risk of vortex generation is increased;

a plurality of disc ribs are convexly arranged on the disc body;

the disc ribs are provided with rib grooves extending along the width direction of the disc ribs.

2. The stirring device of claim 1, wherein the direction of extension of the ribs is along a radial direction of the disc.

3. The stirring device of claim 1, wherein the tank wall of the stirring tank is provided with a push-pull rod to be pushed and pulled by an external force.

4. The stirring device of claim 1, wherein a wall of the stirring tank is provided with an observation port.

5. The stirring device of claim 1, wherein a charging port is formed in a tank wall of the stirring tank.

6. The stirring device of claim 1, wherein the feed inlet is in communication with a feed mechanism.