Electrode dry film forming device and method

Abstract

The invention relates to the field of battery research, development and manufacturing, in particular to an electrode dry-method film forming device and method.The electrode dry-method film forming device comprises a rack, a rotary drum, a working mechanism and a positioning mechanism, and the working mechanism comprises at least one of a stirring assembly and a pressing roller assembly; the rotary drum is connected to the rack, the working mechanism can be detachably connected into the rotary drum, and the working mechanism is arranged to move relative to the rotary drum; the positioning mechanism can be in transmission connection with the stirring assembly or the pressing roller assembly so as to adjust the position of the stirring assembly in the rotary drum or adjust the position of the pressing roller assembly in the rotary drum. Material mixing and film forming are integrated in the same device, the structure is simple, operation is convenient, the experiment efficiency is improved, and the equipment investment cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery research and development and manufacturing, and in particular to an electrode dry film forming device and method. Background Art

[0002] With the rapid development of the new energy industry, the requirements for the various performance of lithium-ion batteries are constantly increasing, and the technological progress of power batteries is based on advanced materials and processes in power battery systems, among which the preparation of lithium-ion battery electrodes is particularly critical. At present, the dry film-forming device used for electrode preparation usually adopts horizontal rollers for film formation, and then thins it through multi-stage rolling to obtain a suitable electrode membrane. Horizontal roller dry film-forming equipment usually occupies a large space, but reducing the volume of the equipment will inevitably reduce the size of key components of the equipment, thereby affecting the quality of the film. In addition, due to vertical feeding during the film-forming process, the rollers cannot completely roll the incoming materials into films, which will cause waste of some materials. If the collection environment is not well controlled, the materials will not be able to be reused repeatedly due to pollution. Summary of the invention

[0003] In view of the problems existing in the above-mentioned prior art, the present application provides an electrode dry film forming device and process, which can ensure the film forming quality while meeting the miniaturization of the device, and can be used in a glove box to realize small-batch, high-quality dry film formation in the laboratory. The technical solution is as follows:

[0004] In one aspect, an electrode dry film forming device comprises:

[0005] frame;

[0006] A rotating drum is connected to the frame, and the axial direction of the rotating drum is arranged along the horizontal direction;

[0007] Characterized in that the device also includes:

[0008] A working mechanism, comprising at least one of a stirring assembly and a pressure roller assembly, wherein the working mechanism is detachably connected to the drum and is configured to move relative to the drum;

[0009] as well as

[0010] A positioning mechanism, the positioning mechanism is drivingly connected to the stirring assembly to adjust the position of the stirring assembly in the rotating drum;

[0011] Alternatively, the positioning mechanism is transmission-connected to the pressure roller assembly to adjust the position of the pressure roller assembly in the rotating drum.

[0012] In a possible implementation manner, a first drive assembly and a second drive assembly are further included, wherein the first drive assembly is transmission-connected to the rotating drum, and the second drive assembly is transmission-connected to the working mechanism.

[0013] In a possible implementation manner, when the stirring component is in a working state, the stirring component rotates at a differential speed relative to the rotating drum.

[0014] In a possible implementation manner, when the pressure roller assembly is in a working state, the rotating drum rotates in a reverse differential speed relative to the pressure roller assembly.

[0015] In a possible implementation manner, the rotating drum is capable of rotating around the axial direction of the rotating drum, and the inner wall of the rotating drum is capable of abutting against the rolling surface of the pressing roller assembly.

[0016] In a possible implementation manner, the positioning mechanism is drivingly connected to a pressure roller shaft of the pressure roller assembly to adjust the pressure between the rolling surface of the pressure roller assembly and the inner wall of the drum.

[0017] In a possible implementation manner, the pressure roller assembly includes a pressure roller shaft and a heating roller, and the heating roller is fixedly connected to the pressure roller shaft.

[0018] In a possible implementation manner, the stirring assembly includes a stirring paddle and a stirring shaft, and the stirring paddle is connected to the stirring shaft.

[0019] In a possible implementation manner, the stirring assembly further includes a crushing blade, and the crushing blade is fixed on the stirring shaft at intervals.

[0020] In a possible implementation manner, the inner wall of the rotating drum and the surface of the pressure roller assembly are covered with an anti-stick coating.

[0021] In a possible implementation manner, a heating device is further included to heat the inner wall of the rotating drum.

[0022] Based on the above technical solution, this application has the following beneficial effects:

[0023] 1. The present application provides an electrode dry film-forming device and method. By replacing the stirring assembly and the pressure roller assembly, the mixing and film-forming processes are integrated into the same device, simplifying the process steps. The device has a simple structure and is easy to operate, which improves experimental efficiency and reduces equipment investment costs. It integrates multiple functions into one and is miniaturized, so it can be placed in a glove box for operation, which can realize the exploration of air-sensitive materials used in dry film formation, diversifying the application scenarios of the device.

[0024] 2. During the mixing and film-forming process, the materials always gather at the bottom of the drum due to gravity. There is no need to circulate the materials multiple times before the film is fully formed, and there will be no waste of materials, thus saving material costs.

[0025] 3. Both the drum and the pressure roller can rotate independently, and can be relatively stationary or realize differential motion with each other. Therefore, they can be used to explore the film-forming effect experiments under different mechanical motion mechanisms, and can be used to conduct experimental exploration on different types of materials by adjusting the speed and pressure.

[0026] 4. The inner wall of the drum and the surface of the pressure roller are covered with a certain thickness of anti-stick coating, which can prevent the electrode material from wearing the pressure roller and improve the surface quality of the membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 : A schematic diagram of an electrode dry film forming device provided in an embodiment of the present application;

[0029] Figure 2 : Schematic diagram of the installation of the drum in the embodiment of the present application;

[0030] Figure 3 : Schematic diagram of the installation of the stirring assembly in the embodiment of the present application;

[0031] Figure 4 : Schematic diagram of the installation of the pressure roller assembly in the embodiment of the present application;

[0032] Figure 5 : Figure 3 An enlarged view of the stirring assembly;

[0033] Figure 6 : A schematic diagram of a process for forming a dry film of an electrode provided in an embodiment of the present application;

[0034] Figure markings: 1-frame, 2-drum, 3-stirring assembly, 4-pressure roller assembly, 5-positioning mechanism, 6-first drive assembly, 7-second drive assembly, 8-sealing cover, 31-stirring paddle, 32-crushing blade, 33-stirring shaft, 41-pressure roller, 42-pressure roller shaft, 51-cylinder, 52-connecting plate, 53-bearing seat, 61-first motor, 62-worm, 63-turbine. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0036] For the following defined terms, these definitions shall apply unless a different definition is given in the claims or elsewhere in this specification. All numerical values, whether or not explicitly indicated, are defined herein as modified by the term "about". The term "about" generally refers to a numerical range that a person of ordinary skill in the art considers to be equivalent to the stated values ​​to produce substantially the same properties, functions, results, etc. A numerical range indicated by a lower value and a higher value is defined to include all numerical values ​​included in the numerical range and all subranges included in the numerical range.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0038] The following describes the electrode dry film forming device provided in the embodiment of the present application. Figure 1-5 , Figure 1 It is a schematic diagram of an electrode dry film forming device. It can be understood that the method structure in the figure is only a technical solution of a specific embodiment of the present application, and the method of the present application may include fewer or more structural features, and is not limited to the device structure described in the figure.

[0039] The electrode dry film forming device of the present application includes a frame 1, a rotating drum 2, a working mechanism and a positioning mechanism 5, the working mechanism includes a stirring assembly 3 and a pressure roller assembly 4, the rotating drum 2 is connected to the frame 1, the stirring assembly 3 and the pressure roller assembly 4 can be detachably connected to the rotating drum 2, and the working mechanism is configured to move relative to the rotating drum 2; the positioning mechanism 5 can be connected to the stirring assembly 3 in a transmission manner to adjust the position of the stirring assembly 3 in the rotating drum 2; or, the positioning mechanism 5 is connected to the pressure roller assembly 4 in a transmission manner to adjust the position of the pressure roller assembly 4 in the rotating drum 2. By providing a detachable working mechanism, the material mixing function and the roller film-forming function are integrated into one device, which reduces the volume of the electrode dry film-forming equipment and allows the equipment to be placed in a glove box for use; in addition, by providing a positioning mechanism 5 to control the heights of the two ends of the stirring component 3 in the drum 2, the stirring component 3 can be operated at different positions in the drum 2, thereby improving the mixing uniformity of the entire material in the drum 2; by adjusting the position of the pressure roller assembly 4 in the drum 2 through the positioning mechanism 5, the axial direction of the pressure roller assembly 4 can be ensured to be consistent with the axial direction of the drum 2, thereby ensuring that the pressure direction of the pressure roller assembly 4 is consistent with the radial direction of the drum 2, thereby ensuring the consistency and uniformity of the film thickness.

[0040] Specifically, the frame 1 may include a base and an outer frame. The base is provided with a drum 2 bracket for supporting the drum 2 and the drum 2 can rotate relative to the bracket. Preferably, the drum bracket is a rotating bracket, which can support the drum 2 to rotate, and is helpful for the flow and mixing of materials inside the drum. The outer frame is connected to the positioning mechanism 5, and is used to fix the position of the positioning mechanism 5, so that the positioning mechanisms 5 at both ends of the drum 2 are at the same horizontal height, and maintain the stability of the positioning mechanism 5 when the device is working, so as to prevent the height of the two ends of the pressure roller assembly 4 from being inconsistent due to the misalignment of the positioning mechanism 5, thereby causing uneven film thickness. Using the frame 1 to carry all the components of the device is conducive to improving the overall stability of the device when it is working and ensuring the safety of the device under high-speed operation.

[0041] In some embodiments, the positioning mechanism 5 includes a cylinder 51, a connecting plate 52 and a bearing seat 53. The cylinder 51 is fixed on the frame 1. The cylinder 51 is fixedly connected to the connecting plate 52. The connecting plate 52 is used to connect the cylinder 51 and the bearing seat 53. The two ends of the stirring shaft 33 and the pressure roller shaft 42 can pass through the bearing seat 53 respectively, so that the stirring assembly 3 and the pressure roller assembly 4 can be kept horizontal at a preset height when rotating. The cylinder 51 can drive the bearing seat 53 to move in the vertical direction through the connecting plate 52 to control the position of the stirring assembly 3 in the rotating drum 2, so that the stirring assembly 3 can rotate at different positions in the rotating drum 2 to ensure that the materials in the rotating drum 2 are fully mixed and uniform. The movement of the bearing seat 53 driven by the cylinder 51 in the vertical direction can also control the distance between the pressure roller assembly 4 and the rotating drum 2, so that the device can replace the pressure roller assembly 4 of different sizes to meet the movement of the pressure roller 41 of different diameters in the rotating drum 2, thereby meeting the exploration of the film forming experiment under different conditions and realizing the application of the device in different scenarios.

[0042] Specifically, the positioning mechanism 5 is connected to the first control device, which can control the movement stroke of the piston rod in the cylinder 51 to control the height of the bearing seat 53 in the vertical direction, thereby controlling the height of the stirring assembly 3 in the rotating drum 2 and the distance between the pressure roller assembly 4 and the rotating drum 2.

[0043] In some embodiments, the drum 2 can rotate around the axial direction of the drum 2, and the axial direction of the drum 2 is arranged in the horizontal direction, so that during the rotation of the drum 2, the materials gather at the bottom of the drum 2 under the action of gravity; the inner wall of the drum 2 can abut against the rolling surface of the pressure roller assembly 4, and during the roller film forming process, the materials at the bottom of the drum 2 can all enter between the pressure roller assembly 4 and the drum 2, so that the input materials can be fully utilized, and there is no need to circulate the feeding multiple times before the film is completely formed, thereby saving material costs. Preferably, the axial direction of the drum 2 is arranged parallel to the ground, and the materials in the drum 2 can be evenly dispersed at the bottom of the drum 2, which is conducive to improving the mixing uniformity during the material stirring process, and is conducive to improving the uniformity of the film thickness during the material roller film forming process.

[0044] Specifically, the positioning mechanism 5 is transmission-connected with the pressure roller assembly 4, ensuring the height position of the pressure roller assembly 4 while ensuring that the pressure roller assembly 4 can rotate at high speed; the positioning mechanism 5 can apply pressure to the pressure roller assembly 4 when the pressure roller assembly 4 abuts against the inner wall of the rotating drum 2, and can adjust the pressure between the rolling surface of the pressure roller assembly 4 and the inner wall of the rotating drum 2 to adjust the force of the pressure roller assembly 4 on the material, thereby controlling the thickness of the rolled film during the film forming process.

[0045] Preferably, the device includes at least two positioning mechanisms 5, which can be respectively connected to the two ends of the pressure roller assembly 4 in a transmission manner, which is beneficial to ensuring the stability of the pressure roller assembly 4; and the positioning mechanism 5 can apply equal pressure to the two ends of the pressure roller assembly 4, thereby ensuring the uniformity of force between the pressure roller assembly 4 and the rotating drum 2.

[0046] In some embodiments, the electrode dry film forming device also includes a first drive component 6 and a second drive component 7. The first drive component 6 is transmission-connected to the rotating drum 2. The first drive component 6 can drive the rotating drum 2 to rotate, and can control the rotation rate and rotation direction of the rotating drum 2, thereby controlling the rotating drum 2 to achieve different motion states during the mixing process and the film forming process.

[0047] Specifically, the first driving assembly 6 includes a first motor 61 and a transmission component. The first motor 61 is drivingly connected to the transmission component. The first motor can provide a driving force to drive the transmission component to move, thereby driving the rotation of the drum 2.

[0048] Preferably, the transmission components are a worm 62 and a turbine 63, both ends of the worm 62 are fixed on the base of the frame 1, one end of the worm 62 is drive-connected to the first motor 61, the turbine 63 is fixed at the opening of the outer wall of the drum 2, and the worm 62 and the turbine 63 are transmission-connected, the first motor 61 can drive the worm 62 to rotate clockwise or counterclockwise, and then under the meshing transmission of the worm 62 and the turbine 63, the drum 2 is rotated clockwise or counterclockwise, and the first motor 61 can control the rotation speed of the drum 2 by controlling the rotation speed of the worm 62.

[0049] The second driving assembly 7 is disposed at one end of the drum 2, and can be connected to the stirring assembly 3 or the pressing roller assembly 4, and the second driving assembly 7 can control the rotation speed and rotation direction of the stirring assembly 3 and the pressing roller assembly 4. Figure 1 The second drive assembly 7 is fixed on the frame 1. One side of the frame 1 for fixing the second drive assembly 7 is provided with an opening through which the stirring shaft 33 and the pressure roller shaft 42 can pass. The stirring shaft 33 and the pressure roller shaft 42 pass through the opening to connect with the second drive assembly, and the stirring shaft 33 and the pressure roller shaft 42 can move up and down in the opening. During the stirring and mixing process, the height of the fixed position of the second drive assembly 7 is consistent with the height of the stirring assembly 3; during the roller film forming process, the height of the fixed position of the second drive assembly 7 is consistent with the height of the pressure roller assembly 4. The second drive assembly 7 can be a second motor.

[0050] In some embodiments, when the stirring assembly 3 is connected to the drum 2, the first drive assembly 6 and the second drive assembly 7 can respectively drive the drum 2 and the stirring assembly 3 to rotate at differential speeds, so that the material is fully mixed and crushed under the action of the high-speed rotating stirring paddle and stirring blade.

[0051] In some embodiments, when the pressure roller assembly 4 is connected to the drum 2, the first drive assembly 6 and the second drive assembly 7 can drive the drum 2 and the pressure roller assembly 4 to rotate differentially. The speed difference between the pressure roller assembly 4 and the drum 2 causes the material to be subjected to a stronger stretching effect when passing through the gap between the pressure roller assembly 4 and the drum 2, thereby improving the film formation uniformity of the diaphragm.

[0052] The differential motion may be rotation in different directions at the same speed, rotation in different directions at different speeds, or rotation in the same direction at different speeds.

[0053] Specifically, the pressure roller assembly 4 and the rotating drum 2 can rotate independently, or rotate relatively stationary, or rotate in the same direction with a differential speed, or rotate in opposite directions with a differential speed, which can be used to explore the film-forming effect under different mechanical motion mechanisms.

[0054] In some embodiments, the pressure roller assembly 4 includes a pressure roller 41 and a pressure roller shaft 42, the axial length of the pressure roller shaft 42 is greater than the axial length of the pressure roller 41, and both ends of the pressure roller shaft 42 can be respectively connected to the positioning mechanism 5 by transmission, and one end of the pressure roller shaft 42 is connected to the second driving assembly 7, and the second driving assembly 7 can drive the pressure roller shaft 42 to rotate. Specifically, the pressure roller 41 is fixedly connected to the pressure roller shaft 42, so that the pressure roller shaft can drive the pressure roller 41 to move relative to the rotating drum 2 inside the rotating drum 2, and prevent the pressure roller 41 from being separated from the pressure roller shaft 42 during the rotation process. Preferably, the axial length of the pressure roller 41 is consistent with the axial length of the rotating drum 2, and the axial length of the pressure roller shaft 42 is greater than the axial length of the rotating drum 2, so that the dispersed materials at the bottom of the rotating drum 2 can completely enter between the pressure roller 41 and the rotating drum 2, and the materials at various locations at the bottom of the rotating drum 2 are subjected to uniform pressure, which is conducive to improving the efficiency of material processing.

[0055] In some embodiments, the pressure roller assembly further includes a heating roller, which is fixedly connected to the pressure roller shaft 43. During the roller-pressing film forming process, the heating roller can heat the surface of the film, thereby improving the ductility of the film.

[0056] In some embodiments, the stirring assembly 3 includes a stirring paddle 31 and a stirring shaft 33, and the stirring paddle 31 is fixedly connected to the stirring shaft 33. Preferably, the stirring paddle 31 is a frame-type stirring paddle, and the diameter of the stirring paddle 31 is the same as the inner diameter of the drum 2. When the stirring paddle 31 rotates, the material adhering to the inner wall of the drum 2 can be brought down, thereby improving the mixing uniformity of the material in the drum 2.

[0057] In some embodiments, the stirring component also includes a crushing blade 32, which is fixed at intervals on the stirring shaft 33. When the stirring component 3 rotates, it can crush the material while mixing the material to obtain a fiberized material. The fiberized material is beneficial to improving the uniformity of film formation during the film forming process.

[0058] Preferably, the stirring paddle 31 can be a paddle-type stirring paddle, which is spaced apart from the crushing blade 32 and fixed on the stirring shaft 33. By adjusting the number and shape of the paddles, it can adapt to the mixing requirements of different types of materials; and it can efficiently shear and mix the materials, thereby improving the working efficiency of the device.

[0059] In some embodiments, sealing covers 8 are provided at both ends of the drum 2. The sealing covers 8 are provided with openings through which the stirring shaft 33 and the pressure roller shaft 42 can pass. The sealing covers 8 can cover the openings at both ends of the drum 2 and are fixed at the openings of the drum 2 during the rotation of the drum 2 to prevent the material from splashing to the outside of the drum 2 during the material mixing and rolling film forming process, thereby avoiding material waste.

[0060] In some embodiments, the inner wall of the drum 2 and the surface of the pressure roller assembly 4 are covered with an anti-stick coating, and specifically, the material of the anti-stick coating may be tungsten carbide or Teflon, etc. The anti-stick coating can prevent the material from wearing the pressure roller 41 and the inner wall of the drum 2 during the rolling process, and prevent the material from adhering to the pressure roller 41 and the inner wall of the drum 2, thereby reducing the agglomeration of the material during the rolling process, and is conducive to improving the surface quality of the electrode membrane.

[0061] In some embodiments, a heating device is further included, the heating device including a heater and a second control device, the heater is electrically connected to the second control device, and the heating time and heating temperature of the heater can be adjusted by the second control device. The heating device can heat the drum 2 during the mixing process, and then heat the material in the drum 2, so that the material is softened and easy to shear.

[0062] The following describes the electrode dry film forming method provided by the embodiment of the present application in combination with the above-mentioned electrode dry film forming device. Please refer to Figure 6 , this specification provides method operation steps such as embodiments or flow charts, but more or fewer operation steps may be included based on routine or non-creative work. The order of steps listed in the embodiments is only one way of executing the order of many steps and does not represent the only execution order. When the preparation method is actually executed, it can be executed in the order of the methods shown in the embodiments or the drawings or in parallel. The method includes:

[0063] S1: Assemble the stirring assembly 3 to the drum 2 and pour the material into the drum 2, turn on the heating device to heat the drum 2, shear and mix the material to obtain a fiberized material;

[0064] The stirring assembly 3 is assembled into the drum 2. The mass of the material poured into the drum 2 can be 100-500g. The mass of the poured material can be controlled by the size of the required diaphragm. Sealing covers 8 are respectively installed at both ends of the opening of the drum 2, so that the stirring shaft 33 passes through the opening on the sealing cover 8 and is inserted into the bearing seat 53. One end of the stirring shaft 33 is connected to the second drive assembly 7. The second drive assembly 7 is turned on to drive the stirring assembly 3 to rotate. The rotation speed of the stirring assembly 3 is 500-2600r / min. It can be understood that the rotation speed can be any point value within the above range, which is not enumerated here. By controlling the rotation speed to the above range, under the joint action of the stirring paddle 31 and the crushing blade 32, the material can be prevented from being deposited and agglomerated in the drum 2, so that the material is fully fiberized and mixed evenly.

[0065] In some embodiments, a heating device is turned on during the mixing process, and the heating temperature of the heating device can be 50-100°C. It can be understood that the heating temperature can be any point value within the above range, which is not enumerated here. Setting the temperature to the above range can soften the material in the drum 2, facilitate crushing and mixing of the material, and improve crushing efficiency and mixing uniformity.

[0066] In some embodiments, during the mixing process, the first driving component 6 is turned on to drive the drum 2 to rotate, and the rotation speed of the drum 2 can be 10-1000r / min. It can be understood that the rotation speed of the drum 2 can be any point value within the above range, which is not enumerated here. The drum 2 and the stirring component 3 are set to rotate in opposite directions to improve the stirring efficiency and save mixing time.

[0067] S2: replacing the stirring assembly 3 with a pressing roller assembly 4, and turning on the heating device to heat the rotating drum 2 and the pressing roller assembly 4, and rolling the fiberized material to obtain a film that meets the thickness requirements;

[0068] After removing the stirring assembly 3, insert the two ends of the pressure roller shaft 42 into the bearing seat 53, and adjust the height of the pressure roller assembly 4 through the positioning mechanism 5, so that the pressure roller assembly 4 and the drum 2 are inscribed, and the two ends of the pressure roller assembly 4 are at the same horizontal height to avoid the problem of uneven film thickness caused by inconsistent height, and ensure the thickness uniformity of the prepared film. The pressure between the pressure roller 41 and the drum 2 is set to 1-50MPa through the positioning mechanism 5. It can be understood that the pressure can be any point value within the above range, and it is not enumerated here. If the pressure is less than the above range, it may cause the material to fail to form a film, or it may be insufficient to extend the material to the required thickness; if the pressure exceeds the above range, the film may be broken due to excessive vertical pressure; by controlling the pressure within the above range, it is beneficial to extend the material to form a film, and obtain electrode membranes with different thickness requirements.

[0069] In some embodiments, the heating device is turned on to heat the rotating drum 2 and the pressure roller 41. The heating temperature can be 50-100°C. It can be understood that the pressure can be any point value within the above range, which is not enumerated here. By controlling the heating temperature to the above range, the material can be softened and the adhesion between the fiberized materials can be improved to avoid the breakage of the materials that are stuck together, which facilitates the film formation of the material; further heating the upper and lower surfaces of the unformed film during the rolling process can improve the ductility of the film, thereby improving the production efficiency.

[0070] In some embodiments, one end of the pressure roller shaft 42 is connected to the second drive assembly 7, and the pressure roller assembly 4 is driven to rotate by the second drive assembly 7, and the speed of the pressure roller assembly 4 can be 10-1000r / min. The rotation of the drum 2 is driven by the first drive assembly 6, and the speed of the drum 2 can be 10-1000r / min. Preferably, the speed of the pressure roller assembly 4 is 300-700r / min; preferably, the speed of the drum 2 is 300-700r / min. It can be understood that the speed of the pressure roller assembly 4 and the speed of the drum 2 can be any point value within the above ranges, which are not enumerated here. In this way, the pressure roller assembly 4 and the drum 2 are set to rotate in a certain speed difference, so that the upper and lower surfaces of the diaphragm are subjected to different friction forces, which is conducive to improving the flatness of the upper and lower surfaces of the diaphragm and improving the rolling efficiency.

[0071] After the fiberized material is rolled into a film, the thickness of the film is measured by a micrometer. If the thickness of the film does not meet the required conditions, the above step S2 is repeated.

[0072] S3: taking out the rolled membrane and cutting it to obtain an electrode membrane.

[0073] The pressing roller assembly 4 is lifted up by the positioning mechanism 5, the membrane is taken out and flattened on a flat plate, and a die cutter is used to cut it into the required electrode membrane size, so as to prepare an electrode membrane with uniform thickness and smooth surface.

[0074] In this way, the electrode membrane is prepared in combination with the above-mentioned electrode dry film-forming device, so that the mixing and film-forming of the electrode membrane can be completed in the same equipment, which simplifies the process steps and the device structure while ensuring the quality of the film. There is no need for multiple cycles of feeding before the film is fully formed, thereby avoiding material waste and saving material costs. During the mixing process and the rolling process, the stirring component 3 and the pressure roller component 4 can rotate in different directions at differential speeds with the drum 2, thereby improving production efficiency.

[0075] The following describes specific embodiments of the present application in combination with the above-mentioned electrode dry film forming device and electrode dry film forming method.

[0076] Example 1

[0077] This embodiment provides an electrode dry film forming method, based on the above electrode dry film forming device, specifically, the method may include the following steps:

[0078] 1. Assemble the stirring assembly 3 to the drum 2. The stirring assembly 3 includes a stirring paddle 31, a crushing blade 32 and a stirring shaft 33. The stirring paddle 31 is fixedly connected to the stirring shaft 33. The crushing blade 32 is fixed on the stirring shaft 33 at intervals. Both ends of the stirring shaft 33 are transmission-connected with the positioning mechanism 5. The positioning mechanism 5 is used to bring the stirring assembly 3 to the center of the drum 2. 200g of material is added to the drum 2. Then, sealing covers 8 are respectively installed at both ends of the drum 2. One end of the stirring shaft 33 passes through the sealing cover 8 and is connected to the second drive assembly 7. The second drive assembly 7 is turned on to drive the stirring assembly 3 to rotate. The speed of the stirring assembly 3 is set to 1000r / min. The heating device is turned on to heat the drum 2. The heating temperature is set to 65°C. The material is sheared and mixed until a large amount of fibrous material appears and the material is completely mixed. Then, the second drive assembly 7 is turned off.

[0079] 2. Disassemble the stirring assembly 3 and assemble the pressure roller assembly 4 into the drum 2. The two ends of the pressure roller assembly 4 are respectively connected to the positioning mechanism 5. The positioning mechanism 5 brings the pressure roller assembly 4 to a position inscribed with the drum 2. One end of the pressure roller assembly 4 is connected to the second drive assembly 7. The pressure between the pressure roller assembly 4 and the drum 2 is set to 3MPa through the positioning mechanism 5. Turn on the heating device to heat the pressure roller assembly 4 and the drum 2. The heating temperature is 65°C. Turn on the second drive assembly 7. Set the speed of the pressure roller assembly 4 to 400r / min and the rotation direction to counterclockwise. Turn on the first drive assembly 6 to drive the drum 2 to rotate. Set the speed of the drum 2 to 600r / min. n, the rotation direction is clockwise; after the pressure roller assembly 4 and the drum 2 work together for 5-15 minutes, the speed of the pressure roller assembly 4 is set to 400r / min through the second drive assembly 7, and the rotation direction is clockwise, and the speed of the drum 2 is set to 600r / min through the first drive assembly 6, and the rotation direction is counterclockwise, after the pressure roller assembly 4 and the drum 2 work together for 15-30 minutes, the first drive assembly 6, the second drive assembly 7 and the heating device are turned off, and the thickness of the diaphragm after rolling is measured by a micrometer. If the thickness of the diaphragm does not meet the required condition of 150μm, repeat the above steps. If the thickness of the diaphragm meets the required condition of 150μm, take out the diaphragm.

[0080] 3. Take out the membrane and flatten it on a flat plate, and use a die cutter to cut it into the required electrode membrane size to prepare the electrode membrane.

[0081] In this embodiment, a simple preparation method is used to fully utilize the materials, and an electrode membrane with uniform thickness and smooth surface can be prepared in a relatively short time.

[0082] Example 2

[0083] This embodiment provides an electrode dry film forming method, based on the above electrode dry film forming device, specifically, the method may include the following steps:

[0084] 1. Assemble the stirring component 3 to the drum 2, which is in transmission connection with the positioning mechanism 5. Use the positioning mechanism 5 to bring the stirring component 3 to the center of the drum 2, add 300g of material into the drum 2, and then install sealing covers 8 at both ends of the drum 2. One end of the stirring shaft 33 passes through the sealing cover 8 and is connected to the second drive component 7. Turn on the second drive component 7 to drive the stirring component 3 to rotate, set the speed of the stirring component 3 to 1500r / min, turn on the heating device to heat the drum 2, set the heating temperature to 85°C, shear and mix the material until a large amount of fibrous material appears and the material is completely mixed, and then turn off the second drive component 7.

[0085] 2. Disassemble the stirring assembly 3 and assemble the pressure roller assembly 4 into the drum 2. The two ends of the pressure roller assembly 4 are respectively connected to the positioning mechanism 5. The positioning mechanism 5 brings the pressure roller assembly 4 to a position inscribed with the drum 2. One end of the pressure roller assembly 4 is connected to the second drive assembly 7. The second drive assembly 7 is turned on. The speed of the pressure roller assembly 4 is set to 500r / min and the rotation direction is counterclockwise. The pressure between the pressure roller assembly 4 and the drum 2 is set to 2.5MPa through the positioning mechanism 5. The heating device is turned on to heat the pressure roller assembly 4 and the drum 2. The heating temperature is 85°C. The first drive assembly 6 is turned on to drive the drum 2 to rotate. The speed of the drum 2 is set to 600r / min. n, the rotation direction is clockwise; after the pressure roller assembly 4 and the drum 2 work together for 15-25 minutes, the speed of the pressure roller assembly 4 is set to 500r / min through the second drive assembly 7, and the rotation direction is clockwise, and the speed of the drum 2 is set to 600r / min through the first drive assembly 6, and the rotation direction is counterclockwise, after the pressure roller assembly 4 and the drum 2 work together for 25-50 minutes, the first drive assembly 6, the second drive assembly 7 and the heating device are turned off, and the thickness of the diaphragm after rolling is measured by a micrometer. If the thickness of the diaphragm does not meet the required condition of 150μm, repeat the above steps. If the thickness of the diaphragm meets the required condition of 150μm, take out the diaphragm.

[0086] 3. Take out the membrane and flatten it on a flat plate, and use a die cutter to cut it into the required electrode membrane size to prepare the electrode membrane.

[0087] In this embodiment, a simple preparation method is used to fully utilize the materials, and an electrode membrane with uniform thickness and smooth surface can be prepared in a relatively short time.

[0088] Example 3

[0089] The method of the second embodiment is different from that of the present invention in that, during the film forming process, the rotation speed of the pressure roller assembly 4 is set to 400 r / min and the rotation direction is clockwise through the second drive assembly 7, and the rotation speed of the drum 2 is set to 400 r / min and the rotation direction is counterclockwise through the first drive assembly 6. After the pressure roller assembly 4 and the drum 2 work together for 15-25 minutes, the rotation speed of the pressure roller assembly 4 is set to 400 r / min and the rotation direction is counterclockwise through the second drive assembly 7, and the rotation speed of the drum 2 is set to 500 r / min and the rotation direction is clockwise through the first drive assembly 6. After the pressure roller assembly 4 and the drum 2 work together for 25-70 minutes, the first drive assembly 6, the second drive assembly 7 and the heating device are turned off, and the thickness of the film after rolling is measured by a micrometer. If the thickness of the film does not meet the required condition of 150 μm, the above steps are repeated. If the thickness of the film meets the required condition of 150 μm, the film is taken out. Compared with Example 2, this embodiment reduces the speed of the pressing roller assembly 4 and the rotating drum 2 and prolongs the rolling time, so that an electrode membrane with uniform thickness and smooth surface can be prepared.

[0090] Comparative Example 1

[0091] The difference from the method of the above-mentioned embodiment 1 is that the heating device is not turned on during the stirring and mixing process and the roller pressing film forming process of this comparative example, and the other specific steps and parameters used are consistent with those of embodiment 1, which are not repeated here. The time cost of preparing the electrode membrane under this condition is significantly higher than that of embodiment 1, and the electrode membrane is easy to break. This is because the heating device is not turned on to heat the material in the drum, making the material block harder, the block material is difficult to fiberize, and the adhesion between the fiberized materials is poor. The sheet material is easy to break during the roller pressing film forming process, which is not conducive to the material film forming, resulting in a serious decrease in the production efficiency of the electrode membrane.

[0092] Comparative Example 2

[0093] The difference from the method of the above-mentioned embodiment 1 is that in the process of roller film forming, the pressure between the pressure roller assembly 4 and the drum 2 is set to 0MPa by the positioning mechanism 5, and the other specific steps and parameters used are consistent with those of embodiment 1, which are not described here. The compaction density of the electrode membrane prepared under this condition is significantly lower than that of embodiment 1, and the time to prepare the required thickness is significantly increased. This is because the positioning mechanism 5 does not apply pressure to the pressure roller assembly 4, and the pressure of the pressure roller assembly 4 is insufficient, resulting in the material not being fully compacted, affecting the compactness of the film; and the insufficient pressure makes it impossible to achieve the required film thickness in a short time, and the film forming efficiency is reduced.

[0094] Comparative Example 3

[0095] The difference from the method of the above-mentioned embodiment 1 is that, in the film forming process of this comparative example, the speed of the pressure roller assembly 4 is set to 400r / min and the rotation direction is counterclockwise through the second drive assembly 7, the first drive assembly 6 is turned on to drive the rotating drum 2 to rotate, and the speed of the rotating drum 2 is set to 400r / min and the rotation direction is counterclockwise; after the pressure roller assembly 4 and the rotating drum 2 work together for 5-15min, the speed of the pressure roller assembly 4 is set to 400r / min and the rotation direction is clockwise through the second drive assembly 7, and the speed of the rotating drum 2 is set to 400r / min and the rotation direction is clockwise through the first drive assembly 6, and the pressure roller assembly 4 is closed after the rotating drum 2 works together for 15-30min. Other specific steps and adopted parameters are consistent with those of embodiment 1, and are not repeated here. Under this condition, the rolling process cannot be carried out, because the rotating drum 2 and the pressure roller assembly 4 rotating at the same speed and in the same direction exert forces in the same direction on the upper and lower surfaces of the material, making it difficult for the material to extend into a film.

[0096] The above description has fully disclosed the specific implementation methods of the present application. It should be pointed out that any changes made by technicians familiar with the field to the specific implementation methods of the present application do not deviate from the scope of the claims of the present application. Accordingly, the scope of the claims of the present application is not limited to the above specific implementation methods.

Claims

1. An electrode dry film forming device, comprising: Rack (1); A rotating drum (2) is connected to the frame (1), and the axial direction of the rotating drum (2) is arranged along the horizontal direction; Characterized in that the device also includes: A working mechanism, comprising at least one of a stirring assembly (3) and a pressure roller assembly (4), wherein the working mechanism is detachably connected to the rotating drum (2), and the working mechanism is configured to move relative to the rotating drum (2); as well as A positioning mechanism (5), the positioning mechanism (5) being in driving connection with the stirring assembly (3) so as to adjust the position of the stirring assembly (3) in the rotating drum (2); Alternatively, the positioning mechanism (5) is transmission-connected to the pressure roller assembly (4) so ​​as to adjust the position of the pressure roller assembly (4) in the rotating drum (2).

2. The device according to claim 1, characterized in that It also comprises a first drive assembly (6) and a second drive assembly (7), wherein the first drive assembly (6) is transmission-connected to the rotating drum (2), and the second drive assembly (7) is transmission-connected to the working mechanism.

3. The device according to claim 1, characterized in that When the stirring component (3) is in a working state, the stirring component (3) rotates at a differential speed relative to the rotating drum (2).

4. The device according to claim 1, characterized in that When the pressure roller assembly (4) is in the working state, the rotating drum (2) rotates in the opposite direction with respect to the pressure roller assembly (4) at a differential speed.

5. The device according to any one of claims 1 to 4, characterized in that The rotating drum (2) is capable of rotating around the axial direction of the rotating drum (2), and the inner wall of the rotating drum (2) is capable of abutting against the rolling surface of the pressing roller assembly (4).

6. The device according to any one of claims 1 to 4, characterized in that The positioning mechanism (5) is connected to the roller shaft of the pressure roller assembly (4) in a transmission manner so as to adjust the pressure between the roller pressing surface of the pressure roller assembly (4) and the inner wall of the rotating drum (2).

7. The device according to any one of claims 1 to 4, characterized in that The pressure roller assembly comprises a pressure roller shaft (43) and a heating roller, and the heating roller is fixedly connected to the pressure roller shaft (43).

8. The device according to any one of claims 1 to 4, characterized in that The stirring assembly (3) comprises a stirring paddle (31) and a stirring shaft (33), and the stirring paddle (31) is connected to the stirring shaft (33).

9. The device according to claim 7, characterized in that The stirring assembly (3) further comprises crushing blades (32), wherein the crushing blades (32) are fixed on the stirring shaft (33) at intervals.

10. The device according to any one of claims 1 to 4, characterized in that The inner wall of the rotating drum (2) and the surface of the pressure roller assembly (4) are covered with an anti-stick coating.

11. The device according to any one of claims 1 to 4, characterized in that It also comprises a heating device for heating the inner wall of the rotating drum (2).

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