Dry method electrode manufacturing equipment
Through the combination of screw extruder, calendering device and current collector device of dry electrode manufacturing equipment, the problem of low film formation quality of existing equipment is solved, and high-quality production and efficient manufacturing of electrode films are achieved.
Patent Information
- Application Number
- CN202422149783.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-02
AI Technical Summary
The existing dry electrode manufacturing equipment has low film formation quality and single function, so it cannot effectively improve the bonding performance and adhesion of the electrodes.
The dry electrode manufacturing equipment consisting of a screw extruder, a calender device, a current collector device, a winding device and a control device are adopted. Through the adjustable spacing and heating control of multiple press rollers, the reprocessing of the initial film material and the compression bonding of the current collector film are realized, and the quality and production efficiency of the electrode film are improved.
The film formation quality and production efficiency of the electrode film are improved, the bonding performance and adhesion of the electrode are enhanced, and environmental pollution and production costs are reduced.
Smart Images
Figure CN223123911U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of battery electrodes, and in particular, to a dry electrode manufacturing device. Background Art
[0002] At present, the mature production processes of battery diaphragms and coated electrodes in the industry are mainly wet coating. After the raw materials are stirred and mixed, a solvent is added to make a slurry. The prepared slurry is transported to the die head of the coater through a conveying and feeding system and evenly coated on the foil, and then enters the oven for drying. However, such electrode coating production processes require the use of toxic organic solvents, and the drying consumes a large amount of electricity and occupies a large area. It not only easily causes environmental pollution, but also greatly increases the production cost.
[0003] The preparation of electrodes can also adopt a dry process. The dry process of electrodes is not only simple in process, but also does not have the problem of solvent volatilization. The electrodes prepared by the dry process have better bonding properties and adhesion, which can further improve the comprehensive performance of the battery. The existing dry electrode manufacturing devices generally focus on the process of extruding powder into a film, and the device functions are relatively single. The subsequent treatment of the film is relatively simple, resulting in a reduction in film formation quality. Summary of the Utility Model
[0004] Based on this, it is necessary to provide a dry electrode manufacturing device to solve the technical problem of low film formation quality of the dry electrode manufacturing device in the existing technology.
[0005] To achieve the above object, the present application provides a dry electrode manufacturing device, which includes:
[0006] A screw extruder for extruding powder into an initial film material;
[0007] A calendering device is arranged at the end of the screw extruder. The calendering device includes a bracket, a plurality of calender rolls and a plurality of rotating motors. The plurality of calender rolls are arranged in sequence along a preset horizontal direction on the bracket. The plurality of rotating motors are respectively connected to the plurality of calender rolls in a one-to-one correspondence. The distance between any two adjacent calender rolls is adjustable, and the initial film material is extruded between any two adjacent calender rolls;
[0008] A current collector device for providing a current collector film between two adjacent calender rolls at the end along the preset horizontal direction. The two calender rolls press and combine the initial film material and the current collector film to form an electrode film;
[0009] A winding device is arranged at the end of the calendering device. The winding device is used for winding the electrode film;
[0010] A control device is respectively communicatively connected to the screw extruder, the calendering device, the current collector device and the winding device; and
[0011] The electric cabinet is electrically connected to the screw extruder, the calendering device, the current collector device, the winding device and the control device respectively.
[0012] Optionally, the rotational speeds of multiple calender rolls along the preset horizontal direction increase sequentially.
[0013] Optionally, the first calender roll at the head end along the preset horizontal direction is a casting roll, the last two calender rolls at the end along the preset horizontal direction are composite rolls, and the remaining calender rolls are calendering rolls. Heating devices are provided inside both the composite rolls and the calendering rolls.
[0014] Optionally, four calendering rolls are provided.
[0015] Optionally, the dry electrode manufacturing equipment further includes a trimming mechanism arranged on the bracket, and the trimming mechanism is used to cut the electrode film into a preset width.
[0016] Optionally, two trimming mechanisms are provided. The two trimming mechanisms are respectively arranged above the last calender roll at the end along the preset horizontal direction and at the bottom of the second last calender roll at the end along the preset horizontal direction.
[0017] Optionally, the dry electrode manufacturing equipment further includes a thickness detection device. The thickness detection device is arranged between the calendering device and the winding device, and the thickness detection device is used to detect the thickness of the electrode film.
[0018] Optionally, the dry electrode manufacturing equipment further includes a swing roll device. The swing roll device is arranged between the calendering device and the winding device, and the swing roll device is used to adjust the tension of the electrode film between the calendering device and the winding device.
[0019] Optionally, the dry electrode manufacturing equipment further includes a mounting frame, and both the current collector device and the winding device are arranged on the mounting frame.
[0020] Optionally, three extrusion screws are provided inside the screw extruder.
[0021] The beneficial effects of the dry electrode manufacturing equipment provided by this application are as follows: Compared with the prior art, the dry electrode manufacturing equipment of this application includes a screw extruder, a calendering device, a current collector device, a winding device, a control device, and an electrical cabinet. After the screw extruder extrudes the initial film material, multiple calender rolls of the calendering device are arranged in sequence along a preset horizontal direction on a bracket, and the initial film material is extruded between any two adjacent calender rolls, realizing the reprocessing of the initial film material and improving the quality of the film material. On the other hand, multiple calender rolls are arranged side by side for calendering and the distance between any two adjacent calender rolls is adjustable. Each calender roll supports each other, which can weaken the deflection deformation of the steel roll. Therefore, the roll pressing accuracy can be gradually improved and the film forming quality can be improved. On the other hand, any two adjacent calender rolls can be used to extrude the initial film material, improving the utilization rate of the calender rolls and effectively improving the production efficiency of the electrode film. On the other hand, the current collector device can also provide a current collector film for the initial film material, enriching the functions of the dry electrode manufacturing equipment and further improving the quality of the electrode film. Description of the Drawings
[0022] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0023] Figure 1 Schematic three-dimensional structure diagram of the dry electrode manufacturing equipment provided by the embodiment of this application;
[0024] Figure 2 Schematic diagram of the calender roll extruding the initial film material of the dry electrode manufacturing equipment provided by the embodiment of this application;
[0025] Figure 3 Schematic diagram of multiple calender rolls with the same speed extruding the initial film material;
[0026] Figure 4 Schematic diagram of multiple calender rolls with sequentially increasing speeds extruding the initial film material of the dry electrode manufacturing equipment provided by the embodiment of this application;
[0027] Figure 5 Schematic diagram of the internal structure of the calendering device of the dry electrode manufacturing equipment provided by the embodiment of this application;
[0028] Figure 6 Schematic diagram of the positional relationship between the current collector device, the winding device, the swing roll device, and the initial film material of the dry electrode manufacturing equipment provided by the embodiment of this application.
[0029] Explanation of the reference numerals in the drawings:
[0030] 1. Screw extruder; 2. Calendering device; 210. Support; 220. Calender roll; 3. Current collector device; 4. Rewinding device; 5. Control device; 6. Electric cabinet; 7. Trimming mechanism; 8. Thickness detection device; 9. Swing roll device; 10. Mounting frame; 11. Initial film material; 12. Current collector film; 13. Electrode film. Detailed implementation manners
[0031] To make the above objects, features, and advantages of the present application more apparent and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.
[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application.
[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.
[0034] In the present application, unless otherwise clearly specified and limited, the terms "mount", "connect", "connection", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0035] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.
[0036] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.
[0037] An embodiment of the present application provides a dry electrode manufacturing device. Please refer to Figures 1 to 6 together. The dry electrode manufacturing device includes a screw extruder 1, a calendering device 2, a current collector device 3, a winding device 4, a control device 5 and an electrical cabinet 6. The screw extruder 1 is used to extrude powder materials into an initial film material 11. The calendering device 2 is disposed at the end of the screw extruder 1. The calendering device 2 includes a bracket 210, a plurality of calender rolls 220 and a plurality of rotating motors. The plurality of calender rolls 220 are arranged in sequence along a preset horizontal direction on the bracket 210. The plurality of rotating motors are connected to the plurality of calender rolls 220 one by one. The distance between any two adjacent calender rolls 220 is adjustable. The initial film material 11 is extruded between any two adjacent calender rolls 220. The current collector device 3 is used to provide a current collector film 12 between two adjacent calender rolls 220 at the end along the preset horizontal direction. The two calender rolls 220 press the initial film material 11 and the current collector film 12 to form an electrode film 13. The winding device 4 is disposed at the end of the calendering device 2. The winding device 4 is used to wind the electrode film 13. The control device 5 is communicatively connected to the screw extruder 1, the calendering device 2, the current collector device 3 and the winding device 4 respectively. The electrical cabinet 6 is electrically connected to the screw extruder 1, the calendering device 2, the current collector device 3, the winding device 4 and the control device 5 respectively.
[0038] Among them, for the convenience of explanation, the preset horizontal direction is shown as the direction x in Figures 1 to 5 .
[0039] In the embodiments of the present application, the dry electrode manufacturing equipment includes a screw extruder 1, a calendering device 2, a current collector device 3, a winding device 4, a control device 5, and an electrical cabinet 6. After the screw extruder 1 extrudes the initial film material 11, a plurality of calender rolls 220 of the calendering device 2 are arranged in sequence along a preset horizontal direction on a bracket 210, and the initial film material 11 is extruded between any two adjacent calender rolls 220, realizing the reprocessing of the initial film material 11 and improving the quality of the film material.
[0040] On the other hand, a plurality of calender rolls 220 are arranged side by side for calendering and the distance between any two adjacent calender rolls 220 is adjustable. Each calender roll 220 supports each other, which can weaken the deflection deformation of the steel roll. Therefore, the roll pressing accuracy can be gradually improved and the film forming quality can be improved.
[0041] On the other hand, any two adjacent calender rolls 220 can be used to extrude the initial film material 11, improving the utilization rate of the calender rolls 220 and effectively improving the production efficiency of the electrode film 13.
[0042] On the other hand, the current collector device 3 can also provide a current collector film 12 for the initial film material 11, enriching the functions of the dry electrode manufacturing equipment and further improving the quality of the electrode film 13.
[0043] In one embodiment, the uniformly mixed powder containing an active agent, a conductive agent, and a binder is fed into the screw extruder 1 through a feeding port. After the powder is fully heated and highly fibrillated and mixed uniformly in the screw extruder 1, it is pushed to the extrusion die head under high pressure and extruded from the slit of the extrusion die head to form the initial film material 11. The production methods of screw mixing and die head extrusion of the screw extruder 1 have the advantages of high speed and large shear force, which are conducive to the high-speed fibrillated mixing uniformity of the powder, and have advantages such as high yield, good thickness consistency, and small equipment volume.
[0044] In one embodiment, the rotation speeds of a plurality of calender rolls 220 along the preset horizontal direction increase sequentially.
[0045] Please refer to Figure 2 , when the rotation speed of the subsequent calender roll 220 along the preset direction is greater than that of the previous calender roll 220, the linear velocity difference between the front and rear two calender rolls 220 will cause a velocity gradient of the initial film material 11 in the thickness direction. When the initial film material 11 is extruded, its surfaces close to different calender rolls 220 have different linear velocities respectively, and the velocity of the middle layer of the initial film material 11 is between the linear velocities of the two surfaces. Since the binder in the powder has a property that when the temperature t of the material ≥ 19 °C, slender fibers will be generated on the surface of the material when it is subjected to shear force, and an intercrossed fiber network will be formed during roll pressing, making the initial film material 11 have a certain toughness. Therefore, the velocity gradient generated between calender rolls 220 with different speeds is beneficial to the further fibrillation of the binder, improving the toughness and tension, reducing wrinkles, and improving the film forming quality.
[0046] It is understood that, please refer to Figure 3 and Figure 4 , after the initial film material 11 is extruded multiple times, its thickness is gradually thinned and calendered; therefore, the distance between two adjacent calender rollers 220 along the preset horizontal direction is sequentially decreased.
[0047] Please refer to Figure 3 , it should be noted here that if the rotational speeds of each calender roller 220 are the same, the corresponding film length will gradually become longer. If the linear speeds of the front and rear rollers are consistent, phenomena such as film slack and sag will occur during long-term production.
[0048] Please refer to Figure 4 , when the rotational speed of the rear calender roller 220 along the preset direction is greater than that of the front calender roller 220, since the surface of the initial film material 11 of the faster-rotating rear calender roller 220 has a faster linear speed, the initial film material 11 can always adhere to the surface of the calender roller 220, avoiding phenomena such as slack and sag.
[0049] In one embodiment, the first calender roller 220 at the head end along the preset horizontal direction is a casting roller, the last two calender rollers 220 at the end along the preset horizontal direction are composite rollers, and the remaining calender rollers 220 are calendering rollers. Heating devices are provided inside both the composite roller and the calendering roller, and the roller surface temperatures of the composite roller and the calendering roller can be custom-controlled to make the initial film material 11 match the most suitable temperature at different calendered thicknesses.
[0050] In one embodiment, please refer to Figure 5 , there are four calendering rollers provided.
[0051] In one embodiment, please refer to Figure 1 and Figure 5 , the dry electrode manufacturing equipment further includes a trimming mechanism 7 provided on the bracket 210, and the trimming mechanism 7 is used to cut the electrode film 13 into a preset width.
[0052] In one embodiment, please refer to Figure 5 , there are two trimming mechanisms 7 provided. The two trimming mechanisms 7 are respectively provided above the last calender roller 220 at the end along the preset horizontal direction and at the bottom of the second-to-last calender roller 220 at the end along the preset horizontal direction. The initial film material 11 is trimmed once separately, and then the initial film material 11 and the current collector film 12 are pressed together to form the electrode film 13 and trimmed again, which can effectively reduce the trimming difficulty of the finished electrode film 13.
[0053] In one embodiment, please refer to Figure 1, the dry electrode manufacturing equipment further includes a thickness detection device 8, which is arranged between the rolling device 2 and the winding device 4, and the thickness detection device 8 is used to detect the thickness of the electrode film 13.
[0054] Specifically, the control device 5 correspondingly adjusts the thickness of the initial film material 11 of the screw extruder 1 and the distance between every two adjacent pressure rollers 220 according to the detection data of the thickness detection device 8, so as to obtain the electrode film 13 with a preset thickness.
[0055] In one embodiment, please refer to Figure 1 and Figure 6 , the dry electrode manufacturing equipment further includes a swing roller device 9, which is arranged between the rolling device 2 and the winding device 4, and the swing roller device 9 is used to adjust the tension of the electrode film 13 between the rolling device 2 and the winding device 4 to ensure that the electrode film 13 is tightly wound on the winding device 4.
[0056] In one embodiment, please refer to Figure 1 and Figure 6 , the dry electrode manufacturing equipment further includes a mounting frame 10, and both the current collector device 3 and the winding device 4 are arranged on the mounting frame 10 to improve the integration degree of the device.
[0057] In one embodiment, three extrusion screws are arranged in the screw extruder 1 to improve the stirring and mixing ability of the powder material.
[0058] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.
[0059] The above-described embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.
Claims
1. A dry electrode manufacturing device, characterized in that, Including: A screw extruder for extruding powder materials into initial film materials; A calendering device arranged at the end of the screw extruder. The calendering device includes a bracket, a plurality of calendering rollers and a plurality of rotating motors. The plurality of calendering rollers are arranged in sequence along a preset horizontal direction on the bracket. The plurality of rotating motors are respectively connected to the plurality of calendering rollers one by one. The distance between any two adjacent calendering rollers is adjustable, and the initial film material is extruded between any two adjacent calendering rollers; A current collector device for providing a current collector film between two adjacent calendering rollers at the end along the preset horizontal direction. The two calendering rollers press and combine the initial film material and the current collector film to form an electrode film; A winding device arranged at the end of the calendering device. The winding device is used for winding the electrode film; A control device respectively communicatively connected to the screw extruder, the calendering device, the current collector device and the winding device; And An electric cabinet respectively electrically connected to the screw extruder, the calendering device, the current collector device, the winding device and the control device.
2. The dry electrode manufacturing equipment according to claim 1, characterized in that The rotational speeds of the plurality of calendering rollers along the preset horizontal direction increase in sequence.
3. The dry electrode manufacturing equipment according to claim 1, wherein, The first calendering roller at the head end along the preset horizontal direction is a casting roller, the last two calendering rollers at the end along the preset horizontal direction are composite rollers, and the remaining calendering rollers are calendering rollers. Heating devices are arranged inside the composite rollers and the calendering rollers.
4. The dry electrode manufacturing equipment according to claim 3, characterized in that, Four calendering rollers are provided.
5. The dry electrode manufacturing equipment according to any one of claims 1-4, characterized in that, The dry electrode manufacturing equipment further includes a trimming mechanism arranged on the bracket. The trimming mechanism is used for cutting the electrode film into a preset width.
6. The dry electrode manufacturing apparatus according to claim 5, wherein, Two trimming mechanisms are provided. The two trimming mechanisms are respectively arranged above the last calendering roller at the end along the preset horizontal direction and at the bottom of the second last calendering roller at the end along the preset horizontal direction.
7. The dry electrode manufacturing apparatus according to any one of claims 1-4, characterized in that, The dry electrode manufacturing equipment further includes a thickness detection device arranged between the calendering device and the winding device. The thickness detection device is used for detecting the thickness of the electrode film.
8. The dry electrode manufacturing equipment according to any one of claims 1-4, characterized in that, The dry electrode manufacturing equipment further includes a swing roller device arranged between the calendering device and the winding device. The swing roller device is used for adjusting the tension of the electrode film between the calendering device and the winding device.
9. The dry electrode manufacturing equipment according to any one of claims 1-4, characterized in that, The dry electrode manufacturing equipment further includes a mounting frame. The current collector device and the winding device are both arranged on the mounting frame.
10. The dry electrode manufacturing equipment according to any one of claims 1-4, characterized in that, Three extrusion screws are arranged inside the screw extruder.