Efficient rolling compound system

Abstract

The utility model relates to an efficient rolling compound system which comprises a hot pressing roller set, the discharging end of the hot pressing roller set is connected with the feeding end of heating equipment, the discharging end of the heating equipment is connected with the feeding end of a cold pressing roller set, and the discharging end of the cold pressing roller set is connected with the feeding end of a winding device. The hot pressing roller group is used for primarily compounding a current collector and a diaphragm to form a first pole piece, the first pole piece is heated by heating equipment in a conveying process, so that the first pole piece releases residual stress to obtain a second pole piece, and the second pole piece is subjected to cold pressing compounding by the cold pressing roller group to obtain a finished product pole piece. And the finished product pole piece is wound by a winding device. By arranging the hot pressing roller set, the heating equipment and the cold pressing roller set, hot pressing, heating and cold pressing can be sequentially conducted on the current collector and the diaphragm, so that residual stress in the pole piece is effectively released, the compounding effect of the pole piece is improved, the problem of subsequent separation of the finished pole piece is effectively avoided, and the product quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery pole piece preparation technical field especially, it is a kind of efficient roll compounding system. BACKGROUND

[0002] Dry method pole piece is a kind of electrode piece manufactured by dry process, realizes powder film formation under no solvent or very little solvent condition, and the film piece after film formation is compounded with current collector, so that dry method pole piece is prepared, with simple process, low energy consumption, environmental protection and other advantages, has extensive application prospect in battery manufacturing field.

[0003] In prior art, through the roll group roll pressing, the film piece and the current collector are tightly joined, so that the film piece and the current collector are compounded.But, this is through the roll group simple roll pressing compound mode, leading to the connection strength between film piece and current collector is poor, film piece and current collector are easy to separate in subsequent pole piece use process, affect product quality. UTILITY MODEL CONTENTS

[0004] Therefore, it is necessary to provide an efficient roll compounding system in view of the problem that the film piece and the current collector are easy to separate after simple roll pressing by the roll group in prior art, so as to cause poor product quality.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] An efficient roll compounding system, including hot pressing roll group, the discharge end of hot pressing roll group links the inlet end of heating equipment, the discharge end of heating equipment links the inlet end of cold pressing roll group, the discharge end of cold pressing roll group links the inlet end of winding device;

[0007] The hot pressing roll group is first compounded with the film piece and the current collector, to form the first pole piece, the first pole piece is heated by the heating equipment during conveying, so that the first pole piece releases residual stress to obtain the second pole piece, the second pole piece is cold-pressed and compounded by the cold pressing roll group to obtain finished pole piece, and the finished pole piece is wound by the winding device.

[0008] As a further improvement of the above technical scheme:

[0009] The hot pressing roll group includes two pairs of symmetrically arranged hot pressing rolls, and a single hot pressing roll can be heated.

[0010] Visual correction assembly is arranged between the hot pressing roll group and the heating equipment.

[0011] The cold pressing roll group includes fixed cold pressing roll and floating cold pressing roll, the floating cold pressing roll is connected with the output end of executing device, the executing device drives the floating cold pressing roll to make linear motion of ascending or descending along vertical direction, so as to adjust the gap between the floating cold pressing roll and the fixed cold pressing roll.

[0012] The winding device comprises a winding air inflation roller, and a winding deviation correction roller set and a winding tension roller set are sequentially connected with the feeding end of the winding air inflation roller.

[0013] A thickness gauge is installed between the cold pressing roller set and the winding device.

[0014] The hot pressing roller set, the heating equipment and the cold pressing roller set are connected through a plurality of composite guide rollers.

[0015] A composite tension roller set is arranged between the hot pressing roller set and the heating equipment.

[0016] The feeding end of the hot pressing roller set is connected with the current collector unwinding device, and the feeding end of the hot pressing roller set is also connected with the discharging end of at least one diaphragm feeding system.

[0017] The single diaphragm feeding system adopts a diaphragm unwinding device or a calender device.

[0018] The utility model discloses the following advantages:

[0019] The utility model discloses compact structure, reasonable, convenient operation can to current collector and diaphragm heat pressure, heating, cold pressing in proper order through setting up hot pressing roller set, heating equipment, cold pressing roller set, thereby effectively release the residual stress in pole piece, improve the composite effect of pole piece, effectively avoid the separation problem of finished product pole piece subsequently, thereby improve product quality.

[0020] The utility model also includes the following advantages:

[0021] (1) through setting up heating equipment, can heat the diaphragm and current collector after heat pressure and get second pole piece, thereby effectively reduce the residual stress in first pole piece, also can accelerate solvent volatilization therein, can effectively improve pole piece composite effect.

[0022] (2) through setting up multiple tension roller sets, deviation correction roller sets, can accurately control the tape speed, tension and deviation correction in pole piece transmission process, improve system working stability.

[0023] (3) through the installation of roll gap displacement sensor between two hot pressing rollers and two cold pressing rollers, the roll gap of hot pressing roller set and cold pressing roller set can be monitored in real time, thereby the consistency of pole piece thickness can be effectively ensured.

[0024] (4) through setting up a plurality of air inflation rollers, the winding / unwinding tension of diaphragm, current collector and finished product pole piece can be accurately and effectively controlled. DRAWINGS

[0025] Figure 1 The structure of the utility model is shown in the figure Figure 1 .

[0026] Figure 2 Structure diagram of the utility model Figure 2 .

[0027] Figure 3 Structure diagram of the utility model Figure 3 .

[0028] Figure 4 Structure diagram of the cold press roller group in the utility model.

[0029] 1, hot press roller group; 2, heating equipment; 3, cold press roller group; 4, diaphragm unwinding device; 5, calendering device; 6, current collector unwinding device; 7, thickness gauge; 8, composite guide roller; 9, winding device; 10, composite tension roller group;

[0030] 301, fixed cold press roller; 302, floating cold press roller; 303, execution device;

[0031] 501, pre-press roller group; 502, calendering guide roller; 503, thinning roller group;

[0032] 601, current collector unwinding air expansion roller; 602, unwinding tension roller group; 603, unwinding deviation correction roller group; 604, unwinding guide roller;

[0033] 901, winding air expansion roller; 902, winding tension roller group; 903, winding deviation correction roller group. DETAILED DESCRIPTION

[0034] The specific implementation of the utility model will be described below in combination with the drawings.

[0035] The structure and function of the utility model are as follows:

[0036] As shown in Figures 1-4 An efficient roller compounding system, comprising a hot press roller group 1, the discharge end of the hot press roller group 1 is connected to the feeding end of a heating equipment 2, the discharge end of the heating equipment 2 is connected to the feeding end of a cold press roller group 3, and the discharge end of the cold press roller group 3 is connected to the feeding end of a winding device 9; the hot press roller group 1 performs primary compounding on the current collector and the diaphragm to form a first pole piece, the first pole piece is heated by the heating equipment 2 during the conveying process, so that the first pole piece releases residual stress to form a second pole piece, and the second pole piece is cold-pressed by the cold press roller group 3 to form a finished product pole piece, which is wound by the winding device 9. By arranging the hot press roller group 1, the heating equipment 2 and the cold press roller group 3, the current collector and the diaphragm can be sequentially hot-pressed, heated and cold-pressed, so that the residual stress in the pole piece is effectively released, the subsequent separation problem of the finished product pole piece is effectively avoided, and the product quality is improved.

[0037] The hot pressing roller group 1 comprises two symmetrically arranged hot pressing rollers, and each hot pressing roller can be heated.

[0038] A visual deviation rectification assembly is arranged between the hot pressing roller group 1 and the heating device 2.

[0039] The heating device 2 can be an oven.

[0040] As shown in FIG. Figure 4 The cold pressing roller group 3 comprises a fixed cold pressing roller 301 and a floating cold pressing roller 302. The execution device 303 drives the floating cold pressing roller 302 to move linearly in the vertical direction to adjust the gap between the floating cold pressing roller 302 and the fixed cold pressing roller 301.

[0041] In the utility model, the execution device 303 adopts hydraulic devices, can provide the rolling force along the vertical direction, and has high control precision.

[0042] The winding device 9 comprises a winding air expansion roller 901.

[0043] The cold pressing roller group 3 and the winding device 9 are cooperatively installed with a thickness gauge 7.

[0044] The hot pressing roller group 1, the heating device 2, the cold pressing roller group 3 and the winding device 9 are connected through a plurality of composite guide rollers 8.

[0045] A composite tension roller set 10 is arranged between the hot-pressing roller set 1 and the heating device 2. By arranging the composite tension roller set 10, the tension of the pole piece during the conveying process can be controlled, and the overall tension is stable.

[0046] The feeding end of the hot-pressing roller set 1 is connected with the current collector unwinding device 6, and the feeding end of the hot-pressing roller set 1 is also connected with the discharging end of at least one film feeding system. As shown in Figures 2-3 The current collector unwinding device 6 comprises a current collector unwinding air expansion roller 601 for unwinding the current collector, the current collector unwinding air expansion roller 601 is connected with the hot-pressing roller set 1 through unwinding guide rollers 604, and the current collector unwinding air expansion roller 601 is also arranged with an unwinding tension roller set 602 and an unwinding deviation correction roller set 603 between the hot-pressing roller set 1, so that the conveying pressure and the conveying angle of the current collector can be effectively controlled.

[0047] In addition, the discharging end of the current collector unwinding air expansion roller 601 is also arranged with a gluing device (not shown in the figure), which is used for coating adhesive on one or two end faces of the current collector.

[0048] The single film feeding system adopts a film unwinding device 4 or a calendering device 5. The efficient roller pressing composite system of the utility model can simultaneously composite two films on two end faces of the current collector, and two film feeding systems are arranged at the feeding end of the hot-pressing roller set 1. Specifically, as shown in Figure 2 The two film feeding systems both adopt the film unwinding device 4, and the single film unwinding device 4 comprises a film unwinding air expansion roller and a plurality of unwinding guide rollers. The film unwinding air expansion roller unwinds the film roll, and the film is conveyed to the feeding end of the hot-pressing roller set 1 through the unwinding guide rollers; or as shown in Figure 3 One film feeding system adopts the film unwinding device 4, and the other film feeding system adopts the calendering device 5. The calendering device 5 comprises a pre-pressing roller set 501 and a thinning roller set 503, the pre-pressing roller set 501 and the thinning roller set 503 are connected through a plurality of calendering guide rollers 502, the film raw material is injected into the feeding end of the pre-pressing roller set 501 through a feeding device, the film raw material is pre-pressed and formed through the pre-pressing roller set 501, and then the film is pressed again through the thinning roller set 503, so that the film is prepared, and the prepared film does not need to be wound, and is directly pressed on one end face of the current collector through the hot-pressing roller set 1.

[0049] The working process of the utility model is as follows:

[0050] The two film feeding systems respectively convey the films to the feeding end of the hot-pressing roller set 1, and at the same time, the current collector unwinding device 6 conveys the current collector with double-side gluing to the feeding end of the hot-pressing roller set 1;

[0051] After the current collector and the two films are hot-pressed through the hot-pressing roller set 1, the two films are respectively compounded on the two end faces of the current collector, so that the first pole piece is formed;

[0052] Subsequently, the forward conveying first pole piece is heated and dried by the heating device 2 during conveying, to obtain a second pole piece;

[0053] Then, the second pole piece is pressed again by the cold pressing roller group 3, to obtain a finished pole piece;

[0054] Finally, the finished pole piece is wound by the winding device 9.

[0055] The above description is an explanation of the utility model, not a limitation of the utility model, the range defined by the utility model is seen from the claims, within the protection range of the utility model, any form of modification can be made.

Claims

1. A high efficiency roll compounding system characterized by: The hot pressing roller group (1) is connected with the heating device (2) at the outlet end, the outlet end of the heating device (2) is connected with the cold pressing roller group (3) at the inlet end, and the outlet end of the cold pressing roller group (3) is connected with the winding device (9) at the inlet end. The hot pressing roller group (1) is used for primary compounding of the current collector and the film to form a first electrode sheet, the first electrode sheet is heated by the heating device (2) during conveying, so that the first electrode sheet releases residual stress to form a second electrode sheet, the second electrode sheet is cold-pressed by the cold pressing roller group (3) to form a finished electrode sheet, and the finished electrode sheet is wound by the winding device (9).

2. A high efficiency roll compounding system as claimed in claim 1, wherein: The hot pressing roller group (1) comprises two symmetrical hot pressing rollers, and each hot pressing roller can be heated.

3. The efficient roll lamination system of claim 1, wherein: A visual correction assembly is arranged between the hot pressing roller group (1) and the heating device (2).

4. The high efficiency roll compounding system of claim 1, wherein: The cold pressing roller group (3) comprises a fixed cold pressing roller (301) and a floating cold pressing roller (302), the floating cold pressing roller (302) is connected with the output end of an executing device (303), the executing device (303) drives the floating cold pressing roller (302) to move linearly upward or downward in the vertical direction, so as to adjust the gap between the floating cold pressing roller (302) and the fixed cold pressing roller (301).

5. The efficient roll lamination system of claim 1, wherein: The winding device (9) comprises a winding air expansion roller (901), the inlet end of the winding air expansion roller (901) is connected with a winding correction roller group (903) and a winding tension roller group (902) in sequence.

6. The efficient roll lamination system of claim 1, wherein: A thickness gauge (7) is installed between the cold pressing roller group (3) and the winding device (9).

7. The efficient roll lamination system of claim 1, wherein: The hot pressing roller group (1), the heating device (2), the cold pressing roller group (3) and the winding device (9) are connected through a plurality of composite guide rollers (8).

8. The efficient roll lamination system of claim 1, wherein: A composite tension roller group (10) is arranged between the hot pressing roller group (1) and the heating device (2).

9. The efficient roll lamination system of claim 1, wherein: The inlet end of the hot pressing roller group (1) is connected with the current collector unwinding device (6), and the inlet end of the hot pressing roller group (1) is also connected with the outlet end of at least one film feeding system.

10. The efficient roll lamination system of claim 9, wherein: Each film feeding system adopts a film unwinding device (4) or a calender device (5).

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