CN217250284U

CN217250284U - Dry preparation device for electrode sheet film

Info

Publication number: CN217250284U
Application number: CN202123391400.4U
Authority: CN
Inventors: 张超; 张耀法; 蔡挺威; 马忠龙
Original assignee: Svolt Energy Technology Wuxi Co Ltd
Current assignee: Svolt Energy Technology Wuxi Co Ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-08-23
Anticipated expiration: 2031-12-29

Abstract

The utility model provides a dry preparation device of an electrode pole piece film, which comprises a pretreatment device, a compaction device and a multistage rolling device which are sequentially arranged on a powder material conveying path, wherein the pretreatment device is used for pre-compacting the powder material into a thick pole piece film; the compacting device is provided with a compacting roller which can bear external driving force and rotate around the self axial direction, the peripheral surface of the compacting roller is provided with a line part, and the compacting roller is used for compacting the thick pole piece film and forming a line structure on the thick pole piece film; the multi-stage rolling device is used for pressing the compacted thick pole piece film into a thin pole piece film with a preset thickness. The utility model discloses a dry process preparation facilities of electrode utmost point piece membrane is through setting up preprocessing device, compaction device and multistage roll-in device to the compaction electrode utmost point piece membrane, and the long electrode utmost point piece membrane of thickness is predetermine in production.

Description

Dry preparation device for electrode sheet film

Technical Field

The utility model relates to a battery electrode preparation technical field, in particular to dry method of electrode piece membrane

Background

With the increasing popularization of new energy automobiles, the requirements of people on the energy density and the safety performance of the lithium ion battery for the automobile are continuously improved, and the energy density of the lithium ion battery for the automobile is expected to reach 500Wh/kg (Wh/kg is the mass energy density of the lithium battery) in the future. In order to realize the rapid popularization of the lithium ion battery, the competitiveness of the lithium ion battery is improved, and the reduction of the production cost of the lithium ion battery is very important.

The processing technology of the pole piece of the lithium ion battery can be divided into a wet process and a dry process according to whether a solvent is used or not. The traditional wet process, which is the most common slurry coating process at present, is to uniformly mix an electrode active material, a conductive agent and a binder to prepare a liquid battery slurry mixture, and then coat and dry an electrode sheet. Therefore, huge electric power consumption is needed to be consumed in the process of producing the pole piece by using a wet coating process, and a serious VOC (volatile organic compound) pollution problem can be generated.

Although the dry-method electrode preparation method has the advantages of no solvent, small occupied area, equipment cost saving and the like, the automation degree is low, and continuous automatic production cannot be realized. The dry electrode technology comprises the steps of mixing an electrode active material with solid conductive agent particles to obtain dry main positive and negative materials with uniformly dispersed conductive agents, adding a dry binder into the materials to obtain fibrous main positive and negative materials, crushing the main positive and negative materials by a crusher to obtain electrode powder, rolling the electrode powder to form a thin electrode sheet film, and finally pressing the formed electrode sheet film onto a metal foil current collector to form a finished electrode.

In the process of producing the electrode pole piece film, the prior device usually adopts the method that powder enters a roller press to be directly rolled for film forming, and the pole piece with the required thickness can be obtained by adjusting a roller gap. However, in the process of preparing the pole piece by the method, the feeding amount and the uniformity of the cloth are difficult to control, so that the surface density of the obtained final pole piece film is unstable, and the pole piece film is often broken due to the fact that the rolling is directly carried out without compacting powder in the production process, and continuous production of the pole piece film cannot be realized.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a dry process preparation facilities of electrode polar plate membrane to the compaction electrode polar plate membrane to produce the long electrode polar plate membrane of predetermineeing thickness.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

a dry method preparation device of an electrode sheet film comprises a pretreatment device, a compaction device and a multi-stage rolling device which are sequentially arranged on a powder material conveying path; the pretreatment device is used for pre-pressing the powdery material into a thick pole piece film; the compacting device is provided with a compacting roller which can bear external driving force and can rotate around the self axial direction, the peripheral surface of the compacting roller is provided with a line part, and the compacting roller is used for compacting the thick pole piece film and forming a line structure on the thick pole piece film; the multi-stage rolling device is used for pressing the compacted thick pole piece film into a long pole piece film with a preset thickness.

Furthermore, a plurality of gears are sleeved on the compaction roller, and the texture part is formed on the tooth part of each gear.

Further, the dry preparation device also comprises a guide piece arranged between the pretreatment device and the compaction device, and the guide piece is used for guiding the thick pole piece film pre-pressed to the compaction device.

Further, the preprocessing device comprises a prepressing mechanism arranged on the conveying path, and the prepressing mechanism comprises a driving unit and a prepressing roller capable of bearing the driving unit and driven to rotate around the axial direction of the prepressing roller.

Further, the compacting roller and/or the pre-pressing roller are/is adjustable in position in a direction perpendicular to the conveying path.

Further, the pretreatment device further comprises a strickle mechanism arranged on the conveying path, the strickle mechanism is positioned at the upstream of the prepressing mechanism, and the strickle mechanism is provided with a strickle piece strickleing off the powdery material conveyed on the conveying path.

Furthermore, the strickle mechanism is including locating separately the support piece of conveying route both sides, the both ends of strickleing the piece and sliding respectively and locating two on the support piece, just the strickleing the piece along the perpendicular to the direction of conveying route is adjustable in position.

Further, the multistage rolling device comprises a multistage rolling mechanism arranged on the conveying path, and a conveying mechanism arranged in the midstream of the compaction device and the multistage rolling mechanism.

Furthermore, the dry preparation device further comprises a material crushing device arranged at the upstream of the conveying path, wherein the material crushing device comprises a material crushing part for crushing the blocky materials into the powdery materials, and a discharging pipeline with a discharging opening, which is arranged on the material crushing part.

Furthermore, a discharge control valve is arranged on the discharging pipeline.

Compared with the prior art, the utility model discloses following advantage has:

dry process preparation facilities of electrode pole piece membrane, through be provided with compaction device on powdery material's transport path, can carry out the compaction to the thick pole piece membrane that powdery material formed through preprocessing device, thereby can strengthen the intensity of thick pole piece membrane, help preventing the fracture of thick pole piece membrane, simultaneously in compaction process, can also realize carrying out the overlap joint processing to discontinuous region in the thick pole piece membrane, and through be provided with line portion on the outer peripheral face of compaction roller, thereby can carry out the in-process of compaction at thick pole piece membrane formation line structure, so that carry out the frictional force between thick pole piece membrane of follow-up roll-in-process increase and the multistage roll-in device to thick pole piece membrane, thereby make the pole piece can change in and get into multistage roll-in device, further produce the long electrode pole piece membrane of predetermineeing thickness.

In addition, a guide piece is arranged between the pretreatment device and the compaction device, so that the thick pole piece film prepared by pre-pressing can be guided to the compaction device. Through be provided with on powdery material transport path and scrape flat mechanism, can also scrape the height of piece through the adjustment when strickleing off the powdery material on the transport path to in the thickness of the electrode pole piece membrane that can produce as required, and carry out the powdery material layer that has certain thickness, so that produce the electrode pole piece membrane of required thickness.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic overall structure diagram of a dry-process manufacturing apparatus for an electrode sheet film according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a strickle mechanism according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a pre-pressing mechanism and a compacting mechanism according to an embodiment of the present invention.

Description of reference numerals:

1. a first conveyor belt; 101. a first driven shaft; 102. a first drive shaft;

2. a second conveyor belt; 201. a second driven shaft; 202. a second driving shaft;

3. a compaction roller; 4. a first drive shaft; 5. pre-pressing rollers; 6. a second drive shaft; 7. a scraping member; 8. a support member; 9. a support roller; 10. a multi-stage rolling mechanism;

11. a third conveyor belt; 1101. a third driving shaft; 1102. a third driven shaft; 1103. tensioning the shaft;

12. a material crushing section; 13. a discharge control valve; 14. a blanking pipeline; 15. a powdery material; 16. a thick pole piece film; 17. a guide member.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", "front", "rear", "left", "right", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same order, but are to be construed as referring to the same order.

Furthermore, in the description of the present invention, the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise explicitly limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood in combination with the specific situation.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The utility model relates to a dry process preparation facilities of electrode utmost point piece membrane, on overall structure, including locating preprocessing device, compaction device and the multistage roll-in device on the 15 transport route of powdery material in proper order. Wherein the pre-processing device is used for pre-pressing the powdery material 15 into the thick pole piece film 16.

The compacting device is provided with a compacting roller 3 which can bear external driving force and can rotate around the self axial direction, the peripheral surface of the compacting roller 3 is provided with a grain part, and the compacting roller 3 is used for compacting the thick pole piece film 16 and forming a grain structure on the thick pole piece film 16. The multi-stage rolling device is used for pressing the compacted thick pole piece film 16 into a long pole piece film with a preset thickness.

The long pole piece film with the preset thickness is the pole piece film with a certain thickness required to be obtained in production.

Based on the above general description, as shown in fig. 1 to 3, as a preferred embodiment, a first conveyor belt 1 and a second conveyor belt 2 are sequentially arranged from left to right on the conveying path of the powdery material 15 in this embodiment, so as to realize the transportation of the powdery material 15 to the multi-stage rolling device. The first conveyor belt 1 has a first driven shaft 101 at a left end thereof and a first driving shaft 102 at a right end thereof, and the second conveyor belt 2 has a second driven shaft 201 at a left end thereof and a second driving shaft 202 at a right end thereof.

In specific implementation, the compacting roller 3 is arranged above the second driven shaft 201, a plurality of gears are sleeved on the compacting roller 3, and the texture part is formed on the gear part of each gear. Through the combined action of compaction roller 3 and second driven shaft 201, can carry out the compaction to the thick pole piece membrane 16 of preforming into to strengthen the intensity of thick pole piece membrane 16, help preventing thick pole piece membrane 16 from breaking, and can overlap joint thick pole piece membrane 16 discontinuous, so that form continuous thick pole piece membrane 16, and then realize the serialization production of electrode pole piece membrane.

In addition, by providing the texture part on the outer peripheral surface of the compacting roller 3, a texture structure corresponding to the shape of the tooth part of the gear can be formed on the upper surface of the thick pole piece film 16, so that the friction force between the thick pole piece film 16 and the multi-stage rolling device can be increased in the subsequent multi-stage rolling, and the thick pole piece film 16 can enter the multi-stage rolling device more easily. Wherein, the compaction roller 3 can be rotated by the first driving shaft 4 arranged above the compaction roller, and the first driving shaft 4 and the compaction roller 3 can be connected by a V-belt or a chain wheel in a transmission way.

As shown in fig. 1, the dry-method manufacturing apparatus further includes a guide 17 disposed between the pre-processing apparatus and the compacting apparatus, and the guide 17 is used to guide the pre-pressed thick pole piece film 16 to the compacting apparatus. The guide member 17 is specifically a transition plate disposed at a joint position of the first conveyor belt 1 and the second conveyor belt 2, and in order to avoid the first conveyor belt 1 and the second conveyor belt 2, left and right sides of the guide member 17 are respectively disposed in an arc shape corresponding to the shapes of the first driving shaft 102 and the second driven shaft 201.

The pre-processing device comprises a pre-pressing mechanism arranged on the conveying path, wherein the pre-pressing mechanism comprises a driving unit and a pre-pressing roller 5 which can bear the driving of the driving unit and rotate around the self axial direction. As also shown in fig. 1, the pre-press roller 5 is disposed above the first driving shaft 102, and the powdery material 15 is rolled to form the thick pole piece film 16 by the cooperation of the first driving shaft 102 and the pre-press roller 5.

In this embodiment, the prepress roller 5 can be driven to rotate by a driving unit, the driving unit comprises a second driving shaft 6 arranged above the prepress roller 5, and the second driving shaft 6 and the prepress roller 5 can be in transmission connection through a V-belt or a chain wheel.

As shown in fig. 3, in this embodiment, in order to facilitate the production of electrode sheet films with different thicknesses, the positions of the compaction roller 3 and the pre-press roller 5 in the direction perpendicular to the conveying path are adjustable, so that the positions of the compaction roller 3 and the pre-press roller 5 in the direction perpendicular to the conveying path can be adjusted according to the thickness of the electrode sheet film to be produced, and further, the gap between the compaction roller 3 and the second driven shaft 201 and the gap between the pre-press roller 5 and the first driving shaft 102 are adjusted, so that the thick electrode sheet film 16 with corresponding thickness is rolled according to the thickness of the electrode sheet film to be produced.

When the installation structure is implemented specifically, mounting columns for mounting the compaction rollers 3 are arranged on two sides of the second conveyor belt, and the compaction rollers 3 are slidably mounted on the mounting columns along the height direction of the mounting columns, so that the height positions of the compaction rollers 3 can be adjusted, and after the height positions of the compaction rollers 3 are adjusted, the sizes of the triangular belts or the chains can be correspondingly adjusted. The structure of the position adjustment of the pre-press roll 5 in the direction perpendicular to the transport path may be similar to the structure of the position adjustment of the compaction roll 3 and will not be described in detail here.

The pre-treatment device also comprises a strickling mechanism arranged on the conveying path, the strickling mechanism is positioned at the upstream of the pre-pressing mechanism, and the strickling mechanism is provided with a strickling piece 7 strickling the powder material 15 conveyed on the conveying path. In addition, the strickle mechanism still includes the support piece 8 of locating respectively in the transport route both sides, and the both ends of strickleing 7 are slided respectively and are located two support pieces 8, and strickle 7 adjustable along the direction upper position of perpendicular to transport route.

As shown in fig. 1 and fig. 2, in practical implementation, two supporting rollers 9 are further disposed at an intermediate position of the first conveying belt 1, so as to support the first conveying belt 1, and prevent the first conveying belt 1 from sinking due to an excessively long length of the first conveying belt 1, which is inconvenient for controlling the conveying thickness of the powdery material 15.

The strickle mechanism then sets up between two backing rolls 9, support piece 8 can specifically set up to two stands of locating 1 both sides of first conveyer belt, strickle a 7 and then slide the horizontal pole that sets up between two stands for the direction of height along the stand, thereby can realize carrying out the level and smooth in the surface of powdery material 15 through strickleing a 7, the thickness of the pole piece membrane that can export as required, the high position to strickle a 7 adjusts, thereby realize exporting the powdery material layer that has certain thickness.

The multistage rolling device includes a multistage rolling mechanism 10 provided on the conveying path, and a conveying mechanism provided upstream of the compacting device and the multistage rolling mechanism 10. As shown in fig. 1, the conveying mechanism is specifically provided as a third conveying belt 11 located between the second conveying belt 2 and the multistage rolling mechanism 10, by which the thick pole piece film 16 conveyed via the second conveying belt 2 can be conveyed into the multistage rolling mechanism 10.

The third conveyor belt 11 has a third driving shaft 1101 provided near the multistage rolling mechanism 10, a third driven shaft 1102 provided near the second conveyor belt 2, and a tension shaft 1103 provided between the third driving shaft 1101 and the third driven shaft 1102. In addition, the multi-stage rolling mechanism 10 may be implemented by a rolling press apparatus commonly used in the art.

The dry preparation apparatus of the present embodiment further includes a material crushing apparatus provided upstream of the conveying path, and the material crushing apparatus includes a material crushing portion 12 for crushing the block-shaped material into a powdery material 15, and a discharge pipe 14 having a discharge opening provided on the material crushing portion 12.

In addition, a discharge control valve 13 is provided in the discharge pipe 14. Wherein, the material crushing device can select the crusher commonly used in the prior art. And through setting up unloading control valve 13, can control the flow of powdery material 15 in unloading pipeline 14 to the thickness of the electrode pole piece membrane that can produce as required adjusts the flow of powdery material 15 in unloading pipeline 14.

When the dry preparation device for the electrode pole piece film is used, the positions of the pre-pressing roller 5 and the compacting roller 3 and the height of the leveling part 7 can be adjusted in advance according to the thickness of the electrode pole piece film to be produced, and then the dry preparation device for the electrode pole piece film is started. The powdery material 15 crushed by the material crushing portion 12 falls onto the first conveyor belt 1 through the blanking pipe 14, and the powdery material 15 is flattened by the strickling mechanism to form a powdery material layer with a certain thickness and is conveyed to the position of the prepressing mechanism through the conveying of the first conveyor belt 1.

The pre-pressing mechanism can pre-press the powdery material layer into a thick electrode piece film 16, the thick electrode piece film 16 is conveyed to the second conveying belt 2 through the guide piece 17, is compacted through the compacting device and is lapped on the discontinuous thick electrode piece film 16, then the continuous thick electrode piece film 16 is conveyed to the conveying mechanism and enters the multi-stage rolling mechanism 10 through the conveying mechanism, and finally the long electrode piece film with the preset thickness is formed through rolling of the multi-stage rolling mechanism 10.

The dry preparation device of electrode pole piece film described in this embodiment, through being provided with the compaction device on the transport route of powdery material 15, can carry out the compaction to the thick pole piece film 16 that powdery material 15 formed through preprocessing device, thereby can strengthen the intensity of thick pole piece film 16, and through further compaction, can realize the overlap joint of discontinuous thick pole piece film 16, and through being provided with line portion on the outer peripheral face at compaction roller 3, thereby can form the line structure on thick pole piece film 16 in the in-process of carrying out the compaction to the pole piece, so that carry out the in-process increase thick pole piece film 16 of follow-up roll-in to thick pole piece film 16 and the frictional force between the multistage roll-in device, thereby make the pole piece can change into multistage roll-in device more easily, further produce the long pole piece film of predetermineeing thickness.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A dry method preparation device of an electrode piece membrane is characterized in that:

comprises a pretreatment device, a compaction device and a multi-stage rolling device which are arranged on a conveying path of a powdery material (15) in sequence; wherein,

the pretreatment device is used for pre-pressing the powdery material (15) into a thick pole piece film (16);

the compacting device is provided with a compacting roller (3) which can bear external driving force and rotate around the axial direction of the compacting device, the peripheral surface of the compacting roller (3) is provided with a texture part, and the compacting roller (3) is used for compacting the thick pole piece film (16) and forming a texture structure on the thick pole piece film (16);

the multi-stage rolling device is used for pressing the compacted thick pole piece film (16) into a long pole piece film with a preset thickness.

2. The dry-process production apparatus for an electrode tab film according to claim 1, characterized in that:

the compaction roller (3) is sleeved with a plurality of gears, and the texture parts are formed in the gear parts of the gears.

3. The dry-process production apparatus for an electrode tab film according to claim 1, characterized in that:

the dry preparation device also comprises a guide (17) arranged between the pretreatment device and the compaction device, and the guide (17) is used for guiding the thick pole piece film (16) pre-pressed to the compaction device.

4. The dry-process production apparatus for an electrode tab film according to claim 1, characterized in that:

the pre-pressing mechanism comprises a driving unit and a pre-pressing roller (5) which can bear the driving of the driving unit and rotate around the self axial direction.

5. The dry-process production apparatus for an electrode tab film according to claim 4, characterized in that:

the compacting roller (3) and/or the pre-pressing roller (5) are/is adjustable in position in a direction perpendicular to the conveying path.

6. The dry-process production apparatus for an electrode tab film according to claim 4, characterized in that:

the pretreatment device also comprises a strickle mechanism arranged on the conveying path, the strickle mechanism is positioned at the upstream of the prepressing mechanism, and the strickle mechanism is provided with a strickle piece (7) strickleing the powdery material (15) conveyed on the conveying path.

7. The dry-process production apparatus for an electrode tab film according to claim 6, characterized in that:

the strickle mechanism is including locating separately strutting piece (8) of transfer path both sides, the both ends of strickleing piece (7) are slided respectively and are located two on strutting piece (8), just strickle piece (7) along the perpendicular to the direction of transfer path is upper position-adjustable.

8. The dry-process production apparatus for an electrode tab film according to claim 1, characterized in that:

the multi-stage rolling device comprises a multi-stage rolling mechanism (10) arranged on the conveying path, and a conveying mechanism arranged in the midstream of the compaction device and the multi-stage rolling mechanism (10).

9. The dry-process production apparatus of an electrode tab film according to any one of claims 1 to 8, characterized in that:

the dry preparation device further comprises a material crushing device arranged at the upstream of the conveying path, wherein the material crushing device comprises a material crushing part (12) used for crushing blocky materials into the powdery materials (15), and a discharging pipeline (14) with a discharging opening and arranged on the material crushing part (12).

10. The dry-process production apparatus for an electrode tab film according to claim 9, characterized in that:

and a discharging control valve (13) is arranged on the discharging pipeline (14).