CN213936237U

CN213936237U - Dry preparation equipment for lithium battery electrode

Info

Publication number: CN213936237U
Application number: CN202022507744.6U
Authority: CN
Inventors: 王林; 林光证; 夏利
Original assignee: SHENZHEN KEJINGSTAR TECHNOLOGY Ltd
Current assignee: SHENZHEN KEJINGSTAR TECHNOLOGY Ltd
Priority date: 2020-11-03
Filing date: 2020-11-03
Publication date: 2021-08-10
Anticipated expiration: 2030-11-03

Abstract

The utility model provides a dry process preparation equipment of lithium cell electrode, including loading attachment, preprocessing device, extrusion device, hot press unit and coiling mechanism. One end of the pretreatment device is communicated with a discharge hole of the feeding device and is used for converting the raw material powder fed by the feeding device into a molten state; the extrusion device is communicated with the other end of the pretreatment device and is used for converting raw material powder in a molten state into a casting film; the hot-pressing device is arranged between the extruding device and the winding device and is used for converting the casting film into a pole piece; the winding device is used for winding the pole pieces. Lithium cell electrode's dry process preparation equipment, simple structure, convenient operation can be used to the extensive dry process of industrialization to make lithium cell pole piece.

Description

Dry preparation equipment for lithium battery electrode

Technical Field

The utility model relates to a lithium ion battery production facility technical field especially relates to a dry process preparation equipment of lithium cell electrode.

Background

Lithium ion batteries are increasingly used in the fields of consumer electronics, electric vehicles and energy storage due to their high energy density and long cycle life.

The manufacturing method of the electrode plate of the lithium ion battery is divided into a wet method and a dry method. The wet method is to mix the raw material of the battery with solvent such as NMP (methyl pyrrolidone) or water to form slurry, then coat the slurry on a current collector by coating equipment, and then evaporate the water in the slurry to obtain the pole piece. Wherein the battery raw material comprises an active material, a conductive agent, an additive and the like. The wet process needs a large amount of solvent, and has the disadvantages of great environmental pollution, relatively complex process and large equipment investment. In the dry process, a solvent is not needed, the raw materials of the battery are in a powder state, and the lithium ion battery pole piece can be prepared by adding an adhesive into the powder and pressing the raw material powder of the battery with a positive current collector or a negative current collector by using extrusion equipment.

However, the existing dry process is still in the manual production stage in the laboratory, and industrial mass production cannot be carried out.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a dry-process manufacturing apparatus for lithium battery electrodes, which is capable of industrial mass production.

The utility model provides a dry process preparation equipment of lithium cell electrode, including loading attachment, preprocessing device, extrusion device, hot press unit and coiling mechanism. One end of the pretreatment device is communicated with a discharge hole of the feeding device and is used for converting the raw material powder fed by the feeding device into a molten state. The extrusion device is communicated with the other end of the pretreatment device and is used for converting the raw material powder in a molten state into a casting film. The hot-pressing device is arranged between the extruding device and the winding device and used for converting the casting film into a pole piece. The winding device is used for winding the pole pieces.

In some embodiments, the feeding device comprises a vibration tank and a vibration motor arranged at one end of the vibration tank, and the discharge port of the vibration tank is communicated with the pretreatment device.

In some embodiments, the pretreatment device comprises a hot melt pump, the hot melt pump is communicated with the feeding device and the extrusion device, and the hot melt pump can adopt an electric heating mode.

In some embodiments, the hot press apparatus includes a first hot press roll and a second hot press roll which are oppositely disposed, and a preset gap is provided between the first hot press roll and the second hot press roll, and the preset gap is used for the casting film to pass through.

In some embodiments, the winding device comprises a winding roller on which the pole piece is wound.

In some embodiments, a transition roller is arranged between the winding device and the hot-pressing device, and the transition roller is used for the belt walking of the dry preparation equipment of the lithium battery electrode.

The utility model provides a dry process preparation equipment of lithium battery electrode, simple structure, convenient operation can be used to the extensive dry process of industrialization to make lithium battery pole piece.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic structural diagram of a dry-process preparation device for a lithium battery electrode of the present invention.

Fig. 2 is a schematic diagram of the formation of the pole piece.

Description of reference numerals:

loading device 10

Vibration trough 11

Pretreatment device 20

Extrusion device 30

Casting film 40

Hot press device 50

First heat and pressure roller 51

Second heat and pressure roller 52

Pole piece 60

Transition roll 70

Winding device 80

Raw material powder 90

The following detailed description will further describe embodiments of the invention in conjunction with the above-described drawings.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the present invention belong. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of embodiments of the invention.

As shown in fig. 1, the utility model provides a dry process preparation equipment of lithium battery electrode, including loading attachment 10, preprocessing device 20, extrusion device 30, hot press unit 50 and coiling mechanism 80. One end of the pretreatment device 20 is communicated with the discharge hole of the feeding device 10. The extruding device 30 is communicated with the other end of the pretreatment device 20. The hot press device 50 is disposed between the extruding device 30 and the winding device 80.

The feeding device 10 is used for feeding the raw material powder 90 to the pretreatment device 20. The pre-treatment device 20 is used to convert the raw material powder 90 into a molten state. The extrusion device 30 is used to convert the raw material powder 90 in a molten state into the casting film 40. The hot press apparatus 50 is used to convert the casting film 40 into a pole piece 60. The winding device 80 is used for winding the pole piece 60.

In this embodiment, the feeding device 10 includes a vibration tank 11 and a vibration motor (not shown) disposed at one end of the vibration tank 11, and a discharge port of the vibration tank 11 is connected to one end of the pretreatment device 20. In this embodiment, the feeding device 10 may be a vibrating screen, and in other embodiments, the feeding device 10 may also be other feeding machines commonly used in the prior art, such as a vacuum feeding machine.

The pretreatment device 20 comprises a hot melt pump, and the hot melt pump can adopt an electric heating mode. The temperature of the hot melt pump is set to 180 ℃ to 185 ℃, so that the raw material powder 90 is fully transformed into a molten state at the temperature. A substance which is solid at normal temperature melts into a liquid state after reaching a certain temperature, and the state at this time is referred to as a molten state. It is understood that the pre-treatment device 20 may also be other hot melting machines or the like commonly used in the art.

In the present embodiment, the raw material powder 90 refers to a positive electrode material powder or a negative electrode material powder. The positive electrode material powder comprises a positive electrode active material, a conductive agent acetylene black, a binder PVDF (polyvinylidene fluoride) and the like, wherein the positive electrode active material is selected from one or more of lithium manganate, lithium cobaltate and lithium iron phosphate. The negative electrode material powder includes a negative electrode active material, a conductive agent acetylene black, a binder PVDF (polyvinylidene fluoride), and the like, and the negative electrode active material includes a carbon material (such as graphite), a silicon-based material, and the like. It is understood that the raw material powder 90 may be further provided according to actual needs to obtain other products.

In the present embodiment, the temperature of the extrusion device 30 is set to 190 ℃ and 195 ℃ so that the raw material powder 90 in a molten state is converted into the casting film 40. The cast film 40 is a non-stretched, non-oriented cast film produced by melt casting. The casting film 40 at this time has a uniform thickness, but if it is necessary to achieve a target thickness, it is also necessary to be processed by the hot press apparatus 50.

As shown in fig. 2, the hot press device 50 includes a first hot press roller 51 and a second hot press roller 52 which are oppositely disposed, and the first hot press roller 51 and the second hot press roller 52 have a preset gap therebetween for the casting film 40 to pass through. By adjusting the predetermined gap, the thickness of the pole piece 60 can be controlled. In addition, the rotation speeds of the first hot pressing roller 51 and the second hot pressing roller 52 are independently adjustable, the rotation speeds of the first hot pressing roller 51 and the second hot pressing roller 52 are different, and the obtained pole piece 60 can have a thinner thickness by setting different rotation speeds. The casting film 40 is rolled by the first and second heat and

pressure rollers

51 and 52 to finally form the pole piece 60 of a target thickness.

In this embodiment, the winding device 80 includes a winding roller, and the pole piece 60 is wound on the winding roller.

In this embodiment, a transition roller 70 is disposed between the winding device 80 and the hot-pressing device 50, and the transition roller 70 is used for the belt running of the dry method preparation equipment for the lithium battery electrode.

When the pole piece 60 is used, firstly, the preset gap between the first hot-pressing roller 51 and the second hot-pressing roller 52 is adjusted according to the required thickness of the pole piece 60, and the first hot-pressing roller 51 and the second hot-pressing roller 52 are set to have different rotating speeds. And after the preset gap and the rotating speed are adjusted, starting the equipment to operate. The raw material powder 90 is fed into the pretreatment device 20 through the feeding device 10, the raw material powder 90 is converted into a molten state under the high temperature and high pressure of the pretreatment device 20, and the pretreatment device 20 further pushes the raw material powder 90 in the molten state into the extrusion device 30. The raw material powder 90 in a molten state is extruded under pressure from the extrusion device 30 to form the casting film 40. As shown in fig. 2, the casting film 40 is further rolled by a first hot-press roll 51 and a second hot-press roll 52 to finally form a pole piece 60 of a target thickness. The pole piece 60 passes through the transition roller 70 and is finally fixed on the winding device 80, and the winding device 80 performs winding operation on the pole piece 60.

The utility model provides a lithium battery electrode's dry process preparation equipment, simple structure, convenient operation can be used to the extensive dry process of industrialization and make lithium ion battery pole piece.

The above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention and are not limited, and although the embodiments of the present invention have been described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions to the technical solutions of the embodiments of the present invention may be made without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. The dry preparation equipment for the lithium battery electrode is characterized by comprising a feeding device, a pretreatment device, an extrusion device, a hot pressing device and a winding device; one end of the pretreatment device is communicated with a discharge hole of the feeding device and is used for converting the raw material powder fed by the feeding device into a molten state; the extrusion device is communicated with the other end of the pretreatment device and is used for converting raw material powder in a molten state into a casting film; the hot-pressing device is arranged between the extruding device and the winding device and is used for converting the casting film into a pole piece; the winding device is used for winding the pole pieces.

2. The dry-process preparation equipment of the lithium battery electrode as claimed in claim 1, wherein the feeding device comprises a vibration tank and a vibration motor arranged at one end of the vibration tank, and a discharge port of the vibration tank is communicated with the pretreatment device.

3. The dry-process production equipment for the lithium battery electrode as claimed in claim 1, wherein the pretreatment device comprises a hot-melt pump, and the hot-melt pump is communicated with the feeding device and the extrusion device.

4. The dry-process production apparatus for a lithium battery electrode according to claim 1, wherein the hot-pressing device includes a first hot-pressing roll and a second hot-pressing roll which are disposed opposite to each other with a predetermined gap therebetween for the passage of the casting film.

5. The dry-process production equipment of the lithium battery electrode according to claim 1, wherein the winding device comprises a winding roller, and the pole piece is wound on the winding roller.

6. The dry-process manufacturing equipment for the lithium battery electrode as claimed in claim 1, wherein a transition roller is arranged between the winding device and the hot-pressing device, and the transition roller is used for belt walking of the dry-process manufacturing equipment for the lithium battery electrode.