Dry-method electrode rolling film-making system

Abstract

The utility model relates to a dry-method electrode calendering film-making system which comprises a blanking device, the discharge end of the blanking device is connected with a film-forming roller group, and the discharge end of the film-forming roller group is connected with a thinning roller group; the discharging device feeds materials to the film forming roller set, the film forming roller set extrudes the materials to form films, and the thinning roller set thinns the films. The tension of the diaphragm can be kept stable in the moving process, so that the problems of diaphragm breakage, material blocking and the like in the diaphragm running process are prevented, and the production efficiency and the product quality are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dry electrode manufacturing, in particular to a dry electrode rolling film making system. Background Art

[0002] The preparation process of lithium battery electrode sheets includes wet preparation process and dry preparation process. The wet preparation process is to coat the liquid slurry on the current collector, add the toxic solvent NMP in the slurry making process, and evaporate it after coating, resulting in resource waste and environmental pollution. The dry preparation process removes the traditional solvent, rolls the active material into a film in solid form, and then composites and cuts the membrane with the current collector to obtain the electrode sheet. The dry preparation process can improve the performance of the battery membrane and greatly improve the economy and environmental protection.

[0003] The existing film making system uses a roller pressing method to roll the raw material into a film. Since the film is long and thin, the existing film making system cannot control the tension of the film after film formation, which may cause problems such as film breakage and material jamming during the operation of the film, affecting production efficiency and product quality. Utility Model Content

[0004] In response to the shortcomings of the above-mentioned existing production technologies, the applicant provides a dry electrode calendering film-making system. By setting up a tension control roller group, the tension of the membrane can be kept stable during movement, thereby preventing problems such as membrane breakage and material jamming during membrane operation, effectively improving production efficiency and product quality.

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

[0006] A dry electrode calendering film-making system, comprising a feeding device, wherein the feeding end of the feeding device is connected to a film-forming roller group, and the feeding end of the film-forming roller group is connected to a thinning roller group;

[0007] The material unloading device feeds the material to the film-forming roller group, the film-forming roller group squeezes the material to form a film sheet, and the thinning roller group thins the film sheet.

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

[0009] The discharge end of the thinning roller group is connected to a winding device, and the winding device winds up the thinned film.

[0010] At least one group of tension control rollers is arranged between the film forming roller group and the winding device;

[0011] The tension control roller group adopts a tension swing roller group, or a tension floating roller group.

[0012] The structure of the tension swing roller group is as follows: it comprises a first fixed roller and a swing roller, and the swing roller is swingably connected to the first fixed roller.

[0013] The structure of the tension floating roller group is as follows: it includes a second fixed roller and a third fixed roller, and a floating roller is arranged between the second fixed roller and the third fixed roller.

[0014] A reversing roller group is installed between the film forming roller group and the thinning roller group, and between the thinning roller group and the winding device. The reversing roller group converts the transmission direction of the film from the horizontal direction to the vertical direction, or from the vertical direction to the horizontal direction.

[0015] The film forming roller group and the thinning roller group both have a heating function.

[0016] A partition roller group is installed between the film forming roller group and the thinning roller group, and between the thinning roller group and the winding device.

[0017] A deviation correction sensor is installed at the feeding part of the winding device;

[0018] At least one thickness gauge is installed between the film forming roller group and the winding device.

[0019] A trimming device is installed between the film forming roller group and the thinning roller group.

[0020] The beneficial effects of the utility model are as follows:

[0021] The utility model has a compact and reasonable structure and is easy to operate. Through back roller film forming and back roller thinning, the film forming surface density and precision are high. The tension control roller group is set to keep the tension of the diaphragm stable during the movement, thereby preventing the diaphragm from breaking, material jamming and other problems during the operation of the diaphragm, and effectively improving production efficiency and product quality.

[0022] The utility model also has the following advantages:

[0023] (1) In the present invention, a series of high-precision tension rollers and tension sensors are used to control the tension of the diaphragm without causing the risk of mechanical damage such as tape breakage to the diaphragm.

[0024] (2) In the present invention, by installing a fixed tension roller and a passing roller at the winding device, it can be ensured that after a roll of film is wound and taken away, the subsequent film will not be pulled back by the front roller group, thereby improving the working stability of the system.

[0025] (3) In the present invention, by providing a deviation correction sensor, the diaphragm can be accurately aligned when being rolled up, thereby preventing the diaphragm from deviating.

[0026] (4) In the present invention, by providing a thinning roller group, the diaphragm can be further fine-rolled and thinned, thereby increasing the compaction density of the diaphragm and obtaining a high-precision diaphragm thickness.

[0027] (5) In the present invention, by providing a trimming device, the waste edges on both sides of the diaphragm can be cut off to reduce the risk of the diaphragm being broken due to the pulling of the waste edges during movement.

[0028] (6) In the utility model, by setting a partition roller group, the diaphragm tension at the front and rear ends (i.e., the feed end and the discharge end) can be isolated, thereby ensuring that the diaphragm runs smoothly at the tension discontinuity point and effectively controlling the tension accuracy of each tension zone, thereby preventing the diaphragm from being damaged during the traction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the utility model.

[0030] Figure 2 It is a structural schematic diagram of the film-forming roller group in the utility model.

[0031] Figure 3 It is a structural schematic diagram of the thinning roller group in the utility model.

[0032] Among them: 1. Film forming roller group; 2. Thinning roller group; 3. Winding device; 4. Correction sensor; 5. Thickness gauge; 6. Tension control roller group; 7. Fixed tension roller; 8. Trimming device; 9. Unloading device; 10. Film; 11. Passing roller; 12. Partition roller group;

[0033] 101. a first positioning roller; 102. a first calendering roller;

[0034] 201, second positioning roller; 202, second calendering roller;

[0035] 601, first fixed roller; 602, swing roller; 603, second fixed roller; 604, third fixed roller; 605, floating roller. DETAILED DESCRIPTION

[0036] The specific implementation of the present utility model is described below in conjunction with the accompanying drawings.

[0037] The structure and functions of the utility model are as follows:

[0038] like Figure 1-Figure 3As shown, a dry electrode calendering film-making system includes a feeding device 9, the feeding end of the feeding device 9 is connected to the film-forming roller group 1, the feeding end of the film-forming roller group 1 is connected to the thinning roller group 2, the feeding end of the thinning roller group 2 is connected to the winding device 3, and at least one group of tension control roller groups 6 are arranged between the film-forming roller group 1 and the winding device 3; the feeding device 9 feeds the material to the film-forming roller group 1, the film-forming roller group 1 extrude the material to form a film 10, the thinning roller group 2 thins the film 10, and the winding device 3 winds up the thinned film 10, and the tension control roller group 6 keeps the tension of the film 10 stable during operation. The dry electrode calendering film-making system of the utility model includes a feeding device 9, a film-forming roller group 1, a thinning roller group 2, a winding device 3 and a tension control roller group 6, which are sequentially connected and arranged from the feeding direction to the discharging direction;

[0039] The unloading device 9 is used to transfer the raw materials required for making the film 10 to the feeding end of the film forming roller group 1;

[0040] like Figure 2 As shown, the film forming roller group 1 includes two symmetrically arranged first positioning rollers 101, and two first calendering rollers 102 arranged between the two first positioning rollers 101, and the two first calendering rollers 102 are symmetrically arranged; the diameter of a single first positioning roller 101 is larger than the diameter of a single first calendering roller 102, and the two first calendering rollers 102 use independent driving devices, and the two first calendering rollers 102 rotate to extrude the material discharged from the unloading device 9 into a film sheet 10;

[0041] like Figure 3 As shown, the thinning roller set 2 is used to thin the film 10 to increase the compaction density of the film 10, thereby improving the quality of subsequent products; the thinning roller set 2 includes two symmetrically arranged second positioning rollers 201 and two symmetrically arranged second calendering rollers 202, and the arrangement form thereof is the same as that of the film forming roller set 1;

[0042] The film forming roller set 1 and the thinning roller set 2 both have a heating function, that is, the first positioning roller 101, the first calendering roller 102, the second positioning roller 201 and the second calendering roller 202 all have a heating function, which can be achieved by oil heating;

[0043] The winding device 3 adopts a winding shaft type, which is used to collect the pressed film 10 into a roll to facilitate subsequent transportation and processing; the feeding part of the winding device 3 is equipped with a correction sensor 4, which is used to detect whether the film 10 is deviated, and adaptively adjust the position of the winding device to ensure that the film 10 is accurately centered when winding, thereby preventing the film 10 from deviating during the winding process;

[0044] In addition, a fixed tension roller 7 and two over rollers 11 are also installed at the winding device 3. The fixed tension roller 7 is used to adjust the tension of the film 10. At the same time, it forms a U-shaped transmission path with the two over rollers 11, so as to ensure that after a roll of film 10 is rolled up and taken away, the subsequent film 10 can be fixed and will not be pulled back by the front roller group of the winding device 3.

[0045] The tension control roller group 6 is used to control the tension of the diaphragm 10 during operation. The tension control roller group 6 adopts a tension swing roller group or a tension floating roller group.

[0046] The structure of the tension swing roller group is as follows: it includes a first fixed roller 601 and a swing roller 602 , the swing roller 602 is swingably connected to the first fixed roller 601 , and the swing roller 602 moves in a circular motion around the connection point relative to the first fixed roller 601 , thereby adjusting the tension of the diaphragm 10 .

[0047] The structure of the tension floating roller group is as follows: it includes a second fixed roller 603 and a third fixed roller 604, a floating roller 605 is arranged between the second fixed roller 603 and the third fixed roller 604, and the floating roller 605 tensions the film 10 by gravity;

[0048] When the tension of the diaphragm 10 is too large during operation, the tension control roller group 6 swings upward or floats, thereby reducing the tension of the diaphragm 10; when the tension of the diaphragm 10 is too small during operation, the tension control roller group 6 swings downward or floats, thereby increasing the tension of the diaphragm 10, thereby keeping the tension of the diaphragm 10 stable during movement.

[0049] In the utility model, a trimming device 8 is installed between the film forming roller group 1 and the thinning roller group 2. The trimming device 8 cuts off the excess waste edges of the film 10 and can cut off the excess waste edges on both sides of the film 10.

[0050] A reversing roller group is installed between the film forming roller group 1 and the thinning roller group 2, and between the thinning roller group 2 and the winding device 3. The reversing roller group converts the transmission direction of the film 10 from the horizontal direction to the vertical direction, or from the vertical direction to the horizontal direction.

[0051] The reversing roller group includes at least one fixed tension roller 7 and at least one passing roller 11 .

[0052] A partition roller group 12 is installed between the film forming roller group 1 and the thinning roller group 2, and between the thinning roller group 2 and the winding device 3. The partition roller group 12 is used to isolate the tension of the film sheets 10 on both sides, so that the tension of the film sheets 10 on both sides can not affect each other.

[0053] At least one thickness gauge 5 is installed between the film forming roller group 1 and the winding device 3, and the thickness gauge 5 detects the thickness of the film 10; the thickness gauge 5 is installed between the film forming roller group 1 and the thinning roller group 2, and is used to detect the thickness of the film 10 after film forming; it can also be installed between the thinning roller group 2 and the winding device 3, and is used to detect the thickness of the film 10 after film reduction. It can be arranged according to actual usage requirements.

[0054] The following is the specific examples section.

[0055] Example 1

[0056] like Figure 1 As shown, according to actual use requirements, in this embodiment, the film forming roller group 1 is arranged horizontally (its feeding and discharging directions are along the vertical direction), and the thinning roller group 2 is arranged vertically (its discharging and discharging directions are along the horizontal direction);

[0057] Two groups of tension control roller groups 6 are arranged between the film forming roller group 1 and the thinning roller group 2, wherein one group of tension control roller groups 6 adopts a tension swing roller group, and the other group of tension control roller groups 6 adopts a tension floating roller group;

[0058] The trimming device 8 and the partition roller group 12 are sequentially arranged between the two tension control roller groups 6, and the partition roller group 12 is ensured to be located at the rear end of the trimming device 8 (i.e., after the discharge end);

[0059] A set of reversing rollers is arranged between the latter set of tension control rollers 6 and the thinning roller set 2. The reversing roller set includes a passing roller 11 and a fixed tension roller 7, so that the film 10 can smoothly enter the thinning roller set 2.

[0060] A tension control roller group 6, a partition roller group 12, a thickness gauge 5 and a reversing roller group are arranged in sequence between the thinning roller group 2 and the winding device 3. The reversing roller group includes a fixed tension roller 7 and two passing rollers 11.

[0061] The working process of this embodiment is as follows:

[0062] The mixed raw materials for film-making are added to the feeding device 9, and the feeding device 9 feeds the materials between the two first calendering rollers 102 of the film-forming roller group 1, and the two first calendering rollers 102 rotate in opposite directions, so as to extrude the materials into films to form a film sheet 10;

[0063] The film 10 after film formation passes through the tension control roller group 6, and the tension control roller group 6 ensures that the film 10 maintains a stable tension during the traction process;

[0064] Subsequently, the film 10 passes through the thinning roller set 2. During the movement of the film 10, the trimming device 8 cuts off the waste edges on both sides of the film 10 to reduce the risk of the film 10 being broken due to the pulling of the waste edges during the movement.

[0065] After trimming, since the tension of the film 10 at the feeding end and the discharging end of the trimming device 8 is inconsistent, a set of partition rollers 12 can be added to separate the tension of the film 10 at the front and rear ends to ensure smooth operation of the film 10;

[0066] Then, the trimmed film 10 enters the thinning roller group 2 for further finishing and thinning;

[0067] Finally, the film 10 passes through the tension control roller group 6 and the isolation roller group 12 in sequence, and enters the winding device 3. The position of the film 10 is detected by the deviation correction sensor 4, so as to automatically adjust the position of the winding device to ensure that the film 10 is accurately centered when winding;

[0068] The thickness gauge 5 detects the thickness of the thinned film 10 .

[0069] The above description is an explanation of the utility model, not a limitation of the utility model. The scope of the utility model is defined by the claims. Any form of modification can be made within the protection scope of the utility model.

Claims

1. A dry electrode rolling film making system, characterized in that: It comprises a material discharge device (9), wherein the discharge end of the material discharge device (9) is connected to a film forming roller group (1), and the discharge end of the film forming roller group (1) is connected to a thinning roller group (2); The unloading device (9) feeds material to the film-forming roller group (1), the film-forming roller group (1) extrude the material to form a film sheet (10), and the thinning roller group (2) thins the film sheet (10); A partition roller group (12) is installed between the film forming roller group (1) and the thinning roller group (2), and between the thinning roller group (2) and the winding device (3); The film-forming roller group (1) comprises two symmetrically arranged first positioning rollers (101), and two first calendering rollers (102) arranged between the two first positioning rollers (101), and the two first calendering rollers (102) are symmetrically arranged; the diameter of a single first positioning roller (101) is greater than the diameter of a single first calendering roller (102).

2. The dry electrode rolling film making system according to claim 1, characterized in that: The discharge end of the thinning roller group (2) is connected to a winding device (3), and the winding device (3) winds up the thinned film (10).

3. The dry electrode rolling film making system according to claim 2, characterized in that: At least one group of tension control rollers (6) is arranged between the film forming roller group (1) and the winding device (3); The tension control roller group (6) adopts a tension swing roller group, or a tension floating roller group.

4. The dry electrode rolling film making system according to claim 3, characterized in that: The structure of the tension swing roller group is as follows: it comprises a first fixed roller (601) and a swing roller (602), and the swing roller (602) is swingably connected to the first fixed roller (601).

5. The dry electrode rolling film making system according to claim 3, characterized in that: The structure of the tension floating roller group is as follows: it includes a second fixed roller (603) and a third fixed roller (604), and a floating roller (605) is arranged between the second fixed roller (603) and the third fixed roller (604).

6. The dry electrode rolling film making system according to claim 1, characterized in that: A reversing roller group is installed between the film forming roller group (1) and the thinning roller group (2), and between the thinning roller group (2) and the winding device (3). The reversing roller group enables the transmission direction of the film (10) to be converted from a horizontal direction to a vertical direction, or from a vertical direction to a horizontal direction.

7. The dry electrode rolling film making system according to claim 1, characterized in that: The film forming roller group (1) and the thinning roller group (2) both have a heating function.

8. The dry electrode rolling film making system according to claim 1, characterized in that: A deviation correction sensor (4) is installed in cooperation with the feeding part of the winding device (3); At least one thickness gauge (5) is installed between the film-forming roller group (1) and the winding device (3).

9. The dry electrode rolling film making system according to claim 1, characterized in that: A trimming device (8) is installed between the film-forming roller group (1) and the thinning roller group (2).

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