CN216213557U

CN216213557U - Dry preparation device for electrode sheet film

Info

Publication number: CN216213557U
Application number: CN202122640212.4U
Authority: CN
Inventors: 张耀法; 张超; 秦士林; 肖强; 蔡挺威; 马忠龙
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-04-05
Anticipated expiration: 2031-10-29

Abstract

The utility model provides a dry preparation device of an electrode sheet film, which comprises a feeding mechanism and a rolling mechanism. The feeding mechanism comprises a bin with a discharge hole and a pressing component arranged in the bin; the pressing component is provided with a head part capable of extruding electrode film block-shaped materials in the storage bin, and the electrode film block-shaped materials are discharged from the discharge hole due to the extrusion of the head part; the rolling mechanism is provided with a first rolling assembly arranged below the discharge port, and the first rolling assembly is used for rolling electrode film block materials in an extrusion state to form a sheet-shaped first film piece. According to the dry preparation device of the electrode piece film, the pressing component is arranged, so that balanced pressure can be applied to the electrode film block-shaped material in the storage bin, and the first piece film piece with uniform thickness can be formed when the electrode film block-shaped material is subjected to rolling treatment by the rolling mechanism.

Description

Dry preparation device for electrode sheet film

Technical Field

The utility model relates to the technical field of lithium ion battery production equipment, in particular to a dry preparation device of an electrode sheet membrane.

Background

The lithium ion battery is a high-capacity long-life environment-friendly battery, has a plurality of advantages, and is widely applied to the fields of energy storage, electric automobiles, portable electronic products and the like. The electrode pole piece is the basis of the lithium ion power battery, and directly determines the electrochemical performance and safety of the battery.

And the electrode sheet film is an important component of the electrode sheet. The processing technology of the electrode sheet film 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 in order to ensure the fluidity of the battery slurry, the solvent content of the battery slurry is generally over 40%. The process of preparing the pole piece by the traditional coating process is also a process of heating and drying a large amount of solvent, which means that the pole piece produced by the mainstream wet coating process needs to consume huge electric power, and the solvent evaporation process causes the production efficiency of the coating process to be lower.

The dry process corresponding to the wet process theoretically needs no solvent, can prepare the electrode sheet film only through the fiberization of the dry binder, and can obtain the dry electrode sheet by hot-pressing and compounding the electrode sheet film and the current collector. The process for preparing the pole piece by the dry method does not need complex coating equipment, and can prepare the battery pole piece only by continuous heating and rolling. The technology does not need a solvent drying process, can obtain the dry-process pole piece only through rolling, has simple equipment and lower energy consumption, has higher production efficiency, and is a more advanced battery pole piece processing technology.

The existing dry method for preparing the pole piece film is mainly divided into two methods, one method is to add powder after airflow pulverization and fibrosis into a horizontal roller press and directly roll the powder by adjusting a roller gap to prepare the pole piece film. However, the thickness of the pole piece film prepared by the method is thick, and if the roll gap is forcibly reduced, the prepared pole piece film becomes brittle due to excessive compaction density, so that the battery pole piece cannot be further prepared. The other method is to prepare the pole piece film with better strength and thinner thickness by repeatedly folding and rolling after kneading and fiberizing, but the existing pole piece film dry preparation equipment has defects in structural design, the thickness uniformity of the prepared pole piece film is lower, the quality of the pole piece film is seriously influenced, the preparation efficiency is low, and the practicability is insufficient.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a dry method manufacturing apparatus for an electrode sheet film, so as to improve the uniformity of the film thickness of a battery electrode sheet.

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

a dry-process production apparatus for an electrode sheet film, comprising:

the feeding mechanism comprises a bin with a discharge hole and a pressing component arranged in the bin; the pressing component is provided with a head part capable of extruding electrode film block-shaped materials in the storage bin, and the electrode film block-shaped materials are discharged through the discharge hole due to the extrusion of the head part;

and the rolling mechanism is provided with a first rolling component arranged below the discharge hole, and the first rolling component is used for rolling the electrode film block material in an extrusion state into a sheet-shaped first film piece.

Further, the head part is provided with an extrusion molding surface for extruding the electrode film block-shaped material.

Further, the extrusion profile is an arc-shaped surface.

Furthermore, the extrusion profile is divided into two parts which are arranged on two sides of the head part.

Furthermore, the first rolling assembly comprises two pressing rollers arranged below the discharge port, and the two pressing rollers are arranged oppositely.

Further, the rolling mechanism further comprises at least one second rolling component arranged at the downstream of the first rolling component; the second rolling component comprises a first mirror roller and a first anilox roller which are oppositely arranged, and is used for rolling the first film piece to form a second film piece with an anilox surface.

Further, the rolling mechanism also comprises a third rolling component arranged at the downstream of the second rolling component;

the third rolling component is provided with two second mirror surface rollers which are oppositely arranged so as to roll the two superposed layers of the second film piece to form a third film piece, and the thickness dimension of the third film piece is smaller than that of the second film piece.

Furthermore, the pressing assembly comprises a boosting part which is in power connection with the head part, and the boosting part is used for driving the head part to extrude the electrode film block-shaped material.

Further, the boosting part comprises a cylinder, and a cylinder rod of the cylinder is connected with the head part.

Further, the dry preparation device also comprises a detection unit and a control unit connected with the detection unit, and the control unit is connected with the boosting part; wherein the detection unit is used for detecting the current change of the first rolling component and sending the current change to the control unit, and the control unit is configured to be capable of responding to a detection signal of the detection unit and outputting a driving signal to control the action of the boosting part.

Compared with the prior art, the utility model has the following advantages:

according to the dry preparation device of the electrode sheet film, the pressing assembly is arranged, so that balanced pressure can be applied to the electrode film block-shaped material in the storage bin, and the first sheet film piece with uniform thickness can be formed when the electrode film block-shaped material is subjected to rolling treatment by the rolling mechanism, so that the quality of the finished product of the electrode sheet film is improved.

In addition, through setting up detecting element and the control unit, can detect the current variation of first roll-in subassembly to regulate and control boosting portion according to the testing result, in order to do benefit to the even push down of head to the cubic material of electrode film, thereby produce the first piece membrane spare that thickness is even. Through setting up second roll-in subassembly and third roll-in subassembly, can carry out the overlap joint combination and roll-in with the electrode piece membrane that the length is shorter of rolling out through first roll-in subassembly roller, and then produce the continuous electrode piece membrane of certain length.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

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

FIG. 2 is a schematic structural view of a second and third rolling assembly according to the present novel embodiment;

fig. 3 is a schematic view of a second film member overlap-rolled according to an embodiment of the present invention.

Description of reference numerals:

1. a feeding mechanism; 101. a storage bin; 102. a discharge port; 103. pressing the assembly; 104. a head portion; 105. extruding the molded surface; 106. a boosting part;

2. a first rolling assembly; 3. electrode film block material; 4. a first sheet of film; 5. a second rolling assembly; 501. a first anilox roll; 502. a first mirror surface roller;

6. a second film member; 7. a third roller press assembly; 701. a second mirror surface roller;

8. a spliced long pole piece film; 9. and a third membrane.

Detailed Description

It should be noted that 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 item, but are instead intended to cover the same item.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically 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 meanings of the above terms in the present invention can be understood in conjunction with specific situations.

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

The utility model relates to a dry preparation device of an electrode pole piece film, which comprises a feeding mechanism 1 and a rolling mechanism on the whole structure as shown in figures 1 to 3, wherein the feeding mechanism 1 comprises a bin 101 with a discharge hole 102 and a pressing component 103 arranged in the bin 101. The pressing unit 103 has a head 104 capable of pressing the electrode film bulk material 3 in the bin 101, and the electrode film bulk material 3 is discharged through the discharge port 102 by the pressing of the head 104. The rolling mechanism is provided with a first rolling component 2 arranged below the discharge port 102, and the first rolling component 2 is used for rolling the electrode film block material 3 in an extrusion state into a sheet-shaped first film piece 4.

The dry preparation device for the battery electrode film in the embodiment can apply balanced pressure to the electrode film bulk material 3 in the storage bin 101 by arranging the pressing component 103, so as to form the first film 4 with uniform thickness. The pressing component 103 described herein can apply a uniform pressure to the electrode film bulk material 3 by mechanical means, or by automatic control, and the like, only the pressing component 103 needs to apply a uniform pressure.

Based on the above general description, in the present embodiment, as a preferred embodiment, as shown in fig. 1, as mentioned above, the feeding mechanism 1 of the present embodiment includes a bin 101 having a discharge port 102, and a pressing assembly 103 disposed in the bin 101, the pressing assembly 103 has a head 104 capable of pressing the electrode film bulk material 3 in the bin 101, and the electrode film bulk material 3 is discharged through the discharge port 102 due to the pressing of the head 104. The rolling mechanism is provided with a first rolling component 2 arranged below the discharge port 102, and the first rolling component 2 is used for rolling the electrode film block material 3 in an extrusion state into a sheet-shaped first film piece 4.

The electrode membrane-block material 3 of this example was an irregular block mixture obtained by kneading and banburying PTFE (polytetrafluoroethylene) to fiberize. The first sheet film member 4 of this embodiment is a relatively short electrode sheet film obtained preliminarily after rolling the electrode film bulk material 3.

As also shown in fig. 1, the first rolling assembly 2 is specifically provided as two rolling rolls arranged below the discharge port 102, and the two rolling rolls are arranged in a left-right opposite arrangement, and a roll gap capable of preparing the first sheet film member 4 is formed between the two rolling rolls.

In the specific implementation, as shown in fig. 1, the feeding mechanism 1 is disposed above the first rolling assembly 2, preferably, the bin 101 of the feeding mechanism 1 is rectangular and disposed at the bottom of the bin 101, so as to form the discharge port 102, and the electrode film block material 3 in the bin 101 can be discharged from the discharge port 102 by being pressed by the head 104 of the pressing assembly 103.

In a preferred embodiment, the head 104 has an extrusion surface 105 for extruding the electrode membrane bulk material 3. As a further arrangement, the pressing profile 105 is provided in two on the left and right sides of the head 104, and at the same time, the pressing profile 105 is provided in an arc-shaped surface. During specific implementation, two extrusion profiles 105 are respectively corresponding to two compression rollers of the first rolling assembly 2, that is, as shown in fig. 1, the distance between the two extrusion profiles 105 and the two compression rollers is approximately equal, so that the head 104 can form uniform downward pressure on the electrode film bulk material 3 conveniently, the electrode film bulk material 3 can be fully utilized, and waste is avoided.

In this embodiment, the pressing unit 103 includes a boosting portion 106 in power connection with the head portion 104, and the boosting portion 106 is used for driving the head portion 104 to press the electrode film bulk material 3. Preferably, in this example, an air cylinder is used as the boosting portion 106 to drive the head 104, a cylinder rod of the air cylinder is connected to the head 104, and by using the air cylinder as the driving mechanism, there is no need to design other transmission mechanisms, so that the structure is simple, the arrangement is convenient, and besides, the air cylinder is used to drive the head 104, other conventional driving devices, such as a servo motor, can be used to drive the head 104.

Preferably, the dry preparation apparatus of the present embodiment is further provided with a detection unit and a control unit connected to the detection unit, and the control unit is connected to the boosting portion 106, the detection unit can be used for detecting the current variation of the first rolling assembly 2 and can send the detected signal to the control unit, and the control unit is configured to be capable of responding to the detection signal of the detection unit and outputting a driving signal to control the action of the boosting portion 106.

Through setting up detecting element and the control unit, can be according to the operating conditions such as the current change of first roll-in subassembly 2, the adjustment pushes down the pressure of subassembly 103 to the cubic material 3 of electrode film in the feed bin 101, and then realizes that head 104 pushes down the equilibrium of the cubic material 3 of electrode film to produce the even first piece membrane 4 of thickness.

Of course, the above-mentioned detecting unit and the control unit can refer to the common structure in the prior art, for example, the detecting unit adopts the conventional current measuring sensor, and the control unit adopts the conventional PLC controller.

In addition, the rolling mechanism in the present embodiment further includes at least one second rolling assembly 5 disposed downstream of the first rolling assembly 2, and a third rolling assembly 7 disposed downstream of the second rolling assembly 5. As shown in fig. 2, the second rolling units 5 are provided in two sets, and the first sheet member 4 is rolled by the first rolling unit 2 to form the second sheet member 6.

In specific implementation, the second rolling component 5 comprises a first mirror roller 502 and a first anilox roller 501 which are oppositely arranged, so as to roll the first film piece 4 to form the second film piece 6 with the screen surface. In the state shown in fig. 2, the second roller pressing assembly 5 located above is specifically set to be the first mirror surface roller 502 as the upper side pressing roller, the first anilox roller 501 as the lower side pressing roller, and the second roller pressing assembly 5 located below is specifically set to be the first anilox roller 501 as the upper side pressing roller and the first mirror surface roller 502 as the lower side pressing roller.

Still as shown in fig. 2, the upper and lower two sets of second rolling assemblies 5 are provided with unwinding rollers wound with the first film 4 for conveying the first film 4 to the second rolling assemblies 5, and the upper and lower two sets of first film 4 pass through the upper and lower two sets of second rolling assemblies 5 respectively to roll and form two sets of second film 6. Wherein, the lower surface of the second film piece 6 formed by rolling through the second rolling component 5 positioned above is a mesh surface, and the upper surface of the second film piece 6 formed by rolling through the second rolling component 5 positioned below is a mesh surface.

By setting the lower surface of the second film piece 6 above and the upper surface of the second film piece 6 below as the mesh surfaces, the two sets of second film pieces 6 above and below can pass through the third rolling assembly 7 in an overlapping or lapping state and are rolled by the third rolling assembly 7.

As shown in fig. 3, the upper and lower second film pieces 6 rolled by the second rolling assembly 5 are stacked and overlapped to form a group of long spliced electrode sheet films 8, and the spliced long electrode sheet films 8 are rolled by the third rolling assembly 7 to form a complete third film piece 9. The third rolling assembly 7 has two second mirror rollers 701 arranged oppositely, and a roll gap between the two second mirror rollers 701 is smaller than that of the second rolling assembly 5, so as to prepare a third film piece 9 with a required thickness.

In addition, a winding roller is arranged at the downstream of the third rolling assembly 7 so as to wind the third film piece 9 formed by rolling through the third rolling assembly 7.

It should be noted that the second film member 6 of the present embodiment is an electrode sheet film with one surface subjected to rough treatment, that is, an electrode sheet film with a textured surface. The third film member 9 of this embodiment is a continuous electrode film as required. Meanwhile, the structures not mentioned in the dry method manufacturing apparatus described in this embodiment can refer to the structure parts of common equipment products in the prior art, for example, the structures not mentioned in the roll pressing mechanism can refer to the structure parts of a conventional horizontal roll pressing machine, and are not described herein again.

The dry-process preparation device of electrode pole piece membrane described in this embodiment can apply balanced pressure to the massive material 3 of electrode membrane in the feed bin 101 through setting up the subassembly 103 that pushes down, and then can form the first piece membrane 4 of even thickness when roll-in mechanism carries out roll-in processing to the massive material 3 of electrode membrane to improve the off-the-shelf quality of electrode pole piece membrane.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A dry method preparation device of an electrode plate film is characterized by comprising the following steps:

the feeding mechanism (1) comprises a bin (101) with a discharge hole (102) and a pressing component (103) arranged in the bin (101); the pressing component (103) is provided with a head part (104) capable of extruding the electrode film block-shaped materials (3) in the storage bin (101), and the electrode film block-shaped materials (3) are discharged through the discharge hole (102) due to the extrusion of the head part (104);

and the rolling mechanism is provided with a first rolling component (2) arranged below the discharge hole (102), and the first rolling component (2) is used for rolling the electrode film block material (3) in an extrusion state to form a sheet-shaped first film piece (4).

2. The dry-process production apparatus for an electrode tab film according to claim 1, characterized in that: the head (104) has an extrusion profile (105) for extruding the electrode membrane cake (3).

3. The dry-process production apparatus for an electrode tab film according to claim 2, characterized in that: the extruded profile (105) is an arc-shaped surface.

4. The dry-process production apparatus for an electrode tab film according to claim 2, characterized in that: the extrusion molding surfaces (105) are respectively arranged on two sides of the head part (104).

5. The dry-process production apparatus for an electrode tab film according to claim 1, characterized in that: the first rolling assembly comprises two pressing rollers arranged below the discharge hole (102), and the two pressing rollers are arranged oppositely.

6. The dry-process production apparatus for an electrode tab film according to claim 1, characterized in that: the rolling mechanism further comprises at least one second rolling assembly (5) arranged downstream of the first rolling assembly (2);

the second rolling component (5) comprises a first mirror roller (502) and a first anilox roller (501) which are oppositely arranged, and is used for rolling the first film piece (4) to form a second film piece (6) with an anilox surface.

7. The dry-process production apparatus for an electrode tab film according to claim 6, characterized in that: the rolling mechanism also comprises a third rolling assembly (7) arranged at the downstream of the second rolling assembly (5);

the third rolling assembly (7) is provided with two second mirror rollers (701) which are oppositely arranged, so that the second film piece (6) with two layers superposed is rolled to form a third film piece (9), and the thickness dimension of the third film piece (9) is smaller than that of the second film piece (6).

8. The dry-process production apparatus of an electrode tab film according to any one of claims 1 to 7, characterized in that: the pressing component (103) comprises a boosting part (106) in power connection with the head part (104), and the boosting part (106) is used for driving the head part (104) to extrude the electrode film block-shaped material (3).

9. The dry-process production apparatus for an electrode tab film according to claim 8, characterized in that: the boosting part (106) comprises a cylinder, and a cylinder rod of the cylinder is connected with the head part (104).

10. The dry-process production apparatus for an electrode tab film according to claim 8, characterized in that: the dry preparation device also comprises a detection unit and a control unit connected with the detection unit, and the control unit is connected with the boosting part (106); wherein the content of the first and second substances,

the detection unit is used for detecting the current change of the first rolling component (2) and sending the current change to the control unit, and the control unit is configured to be capable of responding to a detection signal of the detection unit and outputting a driving signal to control the action of the boosting part (106).