Film pressing equipment and electrode manufacturing system

Abstract

The utility model provides film pressing equipment and an electrode manufacturing system. The film pressing equipment comprises a film forming roller, a fixed roller, a first calendering roller and a second calendering roller which are sequentially arranged according to a material feeding sequence, wherein the circumferential surfaces of the film forming roller, the fixed roller, the first calendering roller and the second calendering roller are all provided with wear-resistant layers, and the thicknesses of the wear-resistant layers are sequentially increased according to the material feeding sequence; the wear resistance of the surfaces of the compression rollers is enhanced, the wear degree of the surfaces of the compression rollers is reduced, the wear degree of the compression rollers can be relatively balanced, the service life of the compression rollers can be prolonged, and the film pressing equipment is ensured to run for a long time with stable performance.

Description

Technical Field

[0001] This application relates to the field of battery cell technology, and in particular to a molding equipment and electrode manufacturing system. Background Technology

[0002] Compared to wet electrode fabrication processes, dry electrode fabrication processes are simpler and less expensive, which is beneficial for preparing high-energy-density and high-performance stable electrodes.

[0003] However, as the compaction density of the material film increases, the extrusion pressure exerted on the material film by the pressure roller system also increases, leading to accelerated wear on the pressure roller surface and affecting the calendering performance and service life of the pressure roller. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a film pressing device and an electrode manufacturing system to solve some or all of the technical problems mentioned above.

[0005] For the purposes described above, a first aspect of this application provides a film pressing device, comprising:

[0006] It includes film-forming rolls, stationary rolls, first calendering rolls, and second calendering rolls arranged in sequence according to the material feeding order;

[0007] The film-forming roller, the stationary roller, the first calendering roller, and the second calendering roller are all provided with a wear-resistant layer on their circumferential surfaces, and the thickness of the wear-resistant layer increases sequentially according to the material feeding order.

[0008] Optionally, the thickness of the wear-resistant layer of the film-forming roll, the stationary roll, the first calendering roll, and the second calendering roll is within the range of 0.1 mm to 0.3 mm.

[0009] Optionally, according to the material feeding sequence, the thickness of the wear-resistant layer of the film-forming roller, the stationary roller, the first calendering roller, and the second calendering roller is inversely proportional to the surface friction coefficient of the corresponding wear-resistant layer.

[0010] Optionally, in the film-forming roll, the stationary roll, the first calendering roll, and the second calendering roll, the ratio of the wear-resistant layer thickness of two adjacent rolls in the material feeding sequence is within the range of 1:1.5 to 1:1.05.

[0011] Optionally, the thicknesses of the wear-resistant layers of the film-forming roll, the stationary roll, the first calendering roll, and the second calendering roll form an arithmetic sequence according to the material feeding order; or,

[0012] The thicknesses of the wear-resistant layers of the film-forming roller, the stationary roller, the first calendering roller, and the second calendering roller are in a geometric sequence according to the material feeding order.

[0013] Optionally, when there is only one first calendering roll and one second calendering roll, the ratio of the wear-resistant layer thickness of adjacent rolls (the film-forming roll, the stationary roll, the first calendering roll, and the second calendering roll) in the material feeding sequence is within the range of 65% to 75%, or...

[0014] When at least one of the first calendering roll and the second calendering roll is at least two, the first calendering roll and the second calendering roll are arranged alternately, and the ratio of the wear-resistant layer thickness of the two adjacent rolls in the order of material feeding is within the range of 75% to 85%.

[0015] Optionally, the wear-resistant layer is a tungsten carbide layer or a chromium oxide layer.

[0016] Optionally, the film pressing equipment also includes:

[0017] The first cutter abuts against the circumferential surface of the stationary roller to cut off the edge portion of the material film conveyed by the stationary roller; the first cutter is movably disposed along the central axis of the stationary roller; and / or

[0018] The second cutter abuts against the circumferential surface of the second calender roll to cut off the edge portion of the material film conveyed by the second calender roll; and the second cutter is movable in the direction extending along the central axis of the second calender roll.

[0019] Optionally, the arrangement direction of the fixed roll and the first calendering roll forms an angle with the arrangement direction of the first calendering roll and the second calendering roll.

[0020] The film-forming roller and the first calendering roller are movable relative to the stationary roller in a first direction.

[0021] The second calendering roll is movable relative to the fixed roll in the first and second directions;

[0022] The second direction is different from the first direction.

[0023] A second aspect of this application provides an electrode manufacturing system, including the lamination apparatus as described in the first aspect.

[0024] As can be seen from the above, the film pressing equipment and electrode manufacturing system provided in this application, by making the wear-resistant layer thickness of the film forming roller, stationary roller, first calendering roller and second calendering roller increase sequentially according to the material feeding order, can make the wear-resistant layer thickness proportional to the extrusion pressure applied to the material film. This not only enhances the wear resistance of each roller surface and reduces the wear degree of each roller surface, but also ensures that the wear degree of each roller is relatively uniform, which can reduce the wear on subsequent rollers in the equipment, help extend the service life of each roller, and ensure that the film pressing equipment operates with stable performance for a long time. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a side view of the film pressing device in an embodiment of this application;

[0027] Figure 2 This is a top view of the film pressing device in the embodiments of this application;

[0028] Figure 3 This is a graph showing the change in compaction density and pressure of the material film in the embodiments of this application;

[0029] Figure 4 This is a graph showing the variation of extrusion pressure and roller diameter ratio in the embodiments of this application;

[0030] Figure 5 This is a graph showing the change in efficiency ratio versus roller diameter ratio in the embodiments of this application;

[0031] Figure 6 This is a graph showing the change in total power versus roller diameter ratio in the embodiments of this application;

[0032] Figure 7 This is a graph showing the change in extrusion pressure versus time when calendering is performed with different roll diameter ratios in the embodiments of this application;

[0033] Figure 8 This is a graph showing the change in torque versus time for one of two adjacent rolls when calendering is performed with different roll diameter ratios in the embodiments of this application.

[0034] Figure 9 This is a graph showing the change in torque versus time for the other of two adjacent rollers when calendering is performed with different roller diameter ratios in the embodiments of this application.

[0035] Figure 10 This is a schematic diagram showing the location of the wear-resistant layer in an embodiment of this application;

[0036] Figure 11 This is a schematic diagram of the electrode manufacturing system in an embodiment of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 10. Film pressing equipment;

[0039] 101. First roll gap; 102. Second roll gap; 103. Third roll gap; 104. Fourth roll gap; 105. Bearing housing; 106. Material film;

[0040] 100. Film-forming roll; 200. Stationary roll; 300. First calendering roll; 400. Second calendering roll; 510. First cutter; 520. Second cutter; 530. Collector; 600. Wear-resistant layer;

[0041] 20. Unwinding assembly; 201. Current collector;

[0042] 30. Spray painting components;

[0043] 40. Pressure roller assembly;

[0044] 50. Slitting component;

[0045] 60. Rewinding assembly;

[0046] 70. Surface density measuring device. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0048] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0049] Traditional battery electrode fabrication methods mostly employ wet electrode fabrication technology. The main process involves mixing active materials, conductive additives, and binders in a solvent to form a slurry. This slurry is then coated onto the surface of a current collector (such as aluminum or copper foil). Drying removes the solvent, allowing the slurry to solidify on the current collector surface, forming a material film that serves as the active layer of the electrode. Although wet electrode fabrication technology is mature and widely used, it still suffers from drawbacks such as difficulty in controlling electrode thickness, high manufacturing costs, and unstable energy density.

[0050] As a preferred option, dry electrode fabrication technology offers greater economic benefits and a simpler manufacturing process. This technology eliminates the use of solvents, instead directly mixing binders, active materials, and conductive agents, followed by calendering the mixture using a multi-roller system to generate a uniformly thick film that serves as the active layer of the electrode. Therefore, dry electrode fabrication technology not only simplifies the production process and reduces environmental impact but also lowers production costs, contributing to higher electrode energy density and more stable performance.

[0051] However, the dry electrode fabrication process requires the use of a multi-roll system to gradually calender the material film to the required thickness. Because the multi-roll system has a large number of rollers, and there are constraints and interference issues during the adjustment of the roller gap between adjacent rollers, it is difficult to achieve precise adjustment of the roller gap, thus affecting the fabrication accuracy of the material film in the dry electrode fabrication technology.

[0052] This application provides a pressure film system 10, combined with... Figures 1-11 The presentation details the membrane pressing system.

[0053] A film-forming system 10 includes a film-forming roller 100, a stationary roller 200, a first calendering roller 300, and a second calendering roller 400 arranged sequentially according to the material feeding sequence. The film-forming roller 100 and the first calendering roller 300 are movably arranged in a first direction, and the second calendering roller 400 is movably arranged in a second direction, which is different from the first direction. The arrangement direction of the stationary roller 200 and the first calendering roller 300 forms an angle with the arrangement direction of the first calendering roller 300 and the second calendering roller 400. The film-forming roller 100, the stationary roller 200, the first calendering roller 300, and the second calendering roller 400 can rotate under the drive of a driving component. In one example, the rotation directions of adjacent pairs of the film-forming roller 100, the stationary roller 200, the first calendering roller 300, and the second calendering roller 400 are opposite.

[0054] Please refer to the details. Figure 1 , Figure 2 and Figure 11 , Figure 1 This is a front view of the pressure film system 10. Figure 2 This is a top view of the pressure film system 10. Figure 11This is a schematic diagram of the electrode manufacturing system.

[0055] like Figure 1 , Figure 2 and Figure 11 As shown, the film-forming roller 100, fixed roller 200, first calendering roller 300, and second calendering roller 400 of the film-pressing system 10 are arranged sequentially according to the material flow sequence. Specifically, when preparing the material film 106 using the film-pressing system 10, the material is fed between the film-forming roller 100 and the fixed roller 200. The material is bitten in through the roller gap between the two and pre-pressed into an initial material film 106. As the fixed roller 200 and the first calendering roller 300 rotate, the material film 106 passes sequentially through the roller gap between the fixed roller 200 and the first calendering roller 300, and the roller gap between the first calendering roller 300 and the second calendering roller 400. During the transmission process, an increasing extrusion pressure is gradually applied, causing the material film 106 to gradually thin and lengthen. As the second calendering roller 400 rotates, the processed material film 106 is successfully output.

[0056] Furthermore, regarding the film-forming roller 100 and the fixed roller 200, the fixed roller 200 can be fixed in position, while the film-forming roller 100 is movable relative to the fixed roller 200 in the first direction. By moving the film-forming roller 100 in the first direction, the roller gap size between the film-forming roller 100 and the fixed roller 200 can be adjusted to optimize the roller gap between them according to the material characteristics, thereby reducing the difficulty of adjusting the roller gap between them. This ensures the degree of biting and pre-extrusion effect of the film-forming roller 100 and the fixed roller 200 on the material, thereby ensuring that the material enters smoothly and is initially formed.

[0057] Furthermore, regarding the fixed roll 200 and the first calendering roll 300, the fixed roll 200 can be fixed in position, while the first calendering roll 300 is movable in the first direction. This reduces the difficulty of adjusting the roll gap between the fixed roll 200 and the first calendering roll 300. When the position of the first calendering roll 300 is freely adjusted along the first direction, the roll gap size between the fixed roll 200 and the first calendering roll 300 can be precisely changed so that the roll gap formed between them can be adapted to the surface of the material film 106 inside. This allows the fixed roll 200 and the first calendering roll 300 to apply extrusion pressure to the material. This not only improves the calendering degree and thinning effect of the material film 106 but also optimizes the compaction effect of the material film 106, ensuring the film-forming effect and efficiency of the material film 106.

[0058] Furthermore, regarding the first calendering roll 300 and the second calendering roll 400, the first calendering roll 300 is movable in a first direction, and the second calendering roll 400 is movable in both the first and second directions. Therefore, by moving at least one of the first calendering roll 300 or the second calendering roll 400, the roll gap size between them can be flexibly adjusted so that the roll gap formed between the two rolls can be adapted to the surface of the material film 106, thereby changing the calendering effect of the two rolls on the material film 106. This allows the thickness of the material film 106 to be further reduced, and under the extrusion pressure applied by the first calendering roll 300 and the second calendering roll 400, the compaction density of the material film 106 can be further increased.

[0059] Furthermore, the second calendering roll 400 can be moved in both the first and second directions, and the first and second directions are different. Therefore, when adjusting the position of the second calendering roll 400 in the first and second directions to adjust the roll gap between the first calendering roll 300 and the second calendering roll 400, it does not affect the roll gap between the rolls, which helps to improve the fineness of the roll gap between the first calendering roll 300 and the second calendering roll 400.

[0060] For example, the first direction can be perpendicular to the second direction; for instance, when the first direction is horizontal, it can be denoted as X; when the second direction is vertical, it can be denoted as Y, and X and Y are perpendicular to each other.

[0061] Furthermore, the film-forming roller 100, the first calendering roller 300, and the second calendering roller 400 are respectively connected to a bearing seat 105. Specifically, the position of the film-forming roller 100 can be changed by moving the bearing seat 105 connected to the film-forming roller 100 along the first direction; the position of the first calendering roller 300 can be changed by moving the bearing seat 105 connected to the first calendering roller 300 along the first direction; and the position of the second calendering roller 400 can be changed by moving the bearing seat 105 connected to the second calendering roller 400 along the first direction and / or the second direction.

[0062] Furthermore, such as Figure 1 and Figure 2 As shown, the arrangement direction of the fixed roll 200 and the first calendering roll 300 is at an angle to the arrangement direction of the first calendering roll 300 and the second calendering roll 400, so that the second calendering roll 400 is staggered relative to the fixed roll 200, which improves the compactness of the arrangement between the fixed roll 200, the first film-forming roll 100 and the second film-forming roll 100, and ensures the film-forming effect and film-forming quality of the electrode; at the same time, it reduces the degree of interference to the roll gap between the first calendering roll 300 and other rolls when adjusting the second calendering roll 400, which helps to achieve precise control of the roll gap between the first calendering roll 300 and the second calendering roll 400.

[0063] For example, in order to improve the adjustment accuracy of the roll gap, the arrangement direction of the fixed roll 200 and the first calendering roll 300 can be a first direction.

[0064] In some embodiments, a first roll gap 101 is formed between the film-forming roller 100 and the stationary roller 200 to compress the bitten material into a material film 106; a second roll gap 102 is formed between the stationary roller 200 and the first calendering roller 300; and a third roll gap 103 is formed between the first calendering roller 300 and the second calendering roller 400, wherein the third roll gap 103 is smaller than the second roll gap 102.

[0065] For the first roll gap 101, as Figure 1 , Figure 2 and Figure 11 As shown, the first roll gap 101 is the roll gap formed between the film-forming roller 100 and the fixed roller 200. Specifically, when the material enters the first roll gap 101, it can be bitten into the material through the first roll gap 101 and pre-pressed to pre-press the material into an initial material film 106 for subsequent calendering. More specifically, since the film-forming roller 100 is movable in the first direction and the fixed roller 200 is fixed, the size of the first roll gap 101 can be changed by adjusting the film-forming roller 100 so that the material to be bitten into can be adapted to the first roll gap 101 and be bitten into smoothly.

[0066] For the second roll gap 102, as Figure 1 , Figure 2 and Figure 11 As shown, the second roll gap 102 is the roll gap formed between the fixed roll 200 and the first calendering roll 300. Specifically, when the material film 106 passes through the inside of the second roll gap 102, the fixed roll 200 and the first calendering roll 300 can apply extrusion pressure to the material film 106 to make the material film 106 thinner and longer. More specifically, since the first calendering roll 300 is movable in the first direction and the fixed roll 200 is fixed, the size of the second roll gap 102 can be precisely adjusted by changing the first calendering roll 300, which can ensure that a uniform and appropriate extrusion pressure is applied to the material film 106 to achieve thickness control of the material film 106 and ensure surface quality.

[0067] For the third roll gap 103, as Figure 1 , Figure 2 and Figure 11As shown, the third roll gap 103 is the roll gap formed between the first calendering roll 300 and the second calendering roll 400. Specifically, when the material film 106 passes through the interior of the third roll gap 103, the first calendering roll 300 and the second calendering roll 400 can apply greater extrusion pressure to the material film 106, so that the material film 106 is further thinned and extended, thereby further increasing the compaction density of the material film 106. More specifically, since the first calendering roll 300 is movable in the first direction and the second calendering roll 400 is movable in both the first and second directions, the size of the third roll gap 103 can be precisely adjusted by changing the positions of the first calendering roll 300 and the second calendering roll 400, and the material film 106 can be further calendered.

[0068] In some embodiments, the outer diameters of the fixed roll 200, the first calendering roll 300, and the second calendering roll 400 increase sequentially according to the material feeding order.

[0069] Specifically, such as Figure 1 , Figure 2 as well as Figure 11 As shown, in accordance with the material feeding direction, if the linear velocity ratio of two adjacent rollers in the fixed roller 200, the first calendering roller 300, and the second calendering roller 400 remains constant, by increasing the outer diameter of these three rollers sequentially according to the material feeding order, it can be ensured that the contact area between the material film 106 and the fixed roller 200, the first calendering roller 300, and the second calendering roller 400 increases sequentially. Therefore, the friction force experienced by the material film 106 during the feeding process also increases, causing the material film 106 to move smoothly and steadily along the feeding direction, and enabling the material film 106 to be uniformly thinned, thereby improving the quality and consistency of the material film 106.

[0070] Furthermore, for the compression molding system 10, the greater the extrusion pressure applied to the material film 106 by the compression molding system 10, the higher the compaction density of the material film 106; specifically, Figure 3 This is a graph showing the change in compaction density versus pressure of the material film 106 in this embodiment of the application. Figure 4 This is a graph showing the variation of extrusion pressure and roller diameter ratio in the embodiments of this application. Figure 5 This is a graph showing the change in efficiency ratio versus roller diameter ratio in the embodiments of this application. Figure 6 This is a graph showing the change in total power versus roller diameter ratio in the embodiments of this application. Figure 7 This is a graph showing the change in extrusion pressure versus time when calendering is performed with different roll diameter ratios in the embodiments of this application. Figure 8 This is a graph showing the change in torque versus time for one of the two adjacent rolls when calendering is performed with different roll diameter ratios in the embodiments of this application. Figure 9 This is a graph showing the change in torque versus time for one of the two adjacent rollers when calendering is performed with different roller diameter ratios in the embodiments of this application.

[0071] according to Figure 3 , Figure 4 It can be seen that, according to the material feeding direction, the compaction density of the material film 106 is directly proportional to the pressure it receives. Specifically, as the roller diameter ratio increases, the extrusion force applied to the material film 106 by the two adjacent pressure rollers is greater, and therefore the pressure received by the material film 106 is greater. At this time, the internal voids of the material film 106 are gradually filled, the compaction density of the material film 106 is improved, and thus the forming quality of the material film 106 is improved.

[0072] Furthermore, taking the first calendering roll 300 and the second calendering roll 400 as examples, let the ratio of the roll diameters of two adjacent rolls be β; even further, for the two rolls, according to Figures 7-9 It can be seen that when the diameter ratio of two adjacent pressure rollers is 1:1, 1:2, 1:3 and 1:4, the extrusion pressure applied by the first pressure roller 300 and the second pressure roller 400 to the material film 106 tends to stabilize as the calendering process continues. Among them, when the diameter ratio is small, the torque difference between the two pressure rollers is greater, and the extrusion pressure applied to the material film 106 is also greater, so the calendering effect on the material is better.

[0073] Furthermore, to balance the relationship between the roller diameter ratio and power in the film pressing system 10, an efficiency ratio parameter can be defined. The efficiency ratio can be expressed as the ratio of the extrusion pressure to the total power, which describes the efficiency of the extrusion pressure applied to the material film 106 by the film pressing system 10 under the condition of consuming a certain amount of energy. Specifically, taking the first calendering roller 300 and the second calendering roller 400 as examples, the efficiency ratio can be expressed as the ratio of the extrusion pressure to the total power; where the extrusion pressure refers to the extrusion pressure on the material film 106 between the first calendering roller 300 and the second calendering roller 400, and the total power of the film pressing system 10 includes four parts: the power required to drive the first calendering roller 300 to rotate, the motor power required for the first calendering roller 300 to provide torque for calendering the material, the power required to drive the second calendering roller 400 to rotate, and the motor power required for the second calendering roller 400 to provide torque for calendering the material film 106.

[0074] Furthermore, according to Figures 5-6 It can be seen that, according to the material feeding sequence, under the premise of ensuring the same linear speed ratio, when the roller diameter ratio of two adjacent pressure rollers decreases, a greater extrusion force can be generated between the two pressure rollers, thereby more effectively realizing the calendering of the material film 106; that is, when the outer diameters of the fixed roller 200, the first calendering roller 300 and the second calendering roller 400 increase sequentially according to the material feeding sequence, the efficiency ratio of the film pressing system 10 increases sequentially, and the film pressing system 10 can generate a greater extrusion force under the same energy consumption, thereby improving the calendering efficiency of the equipment on the material film 106.

[0075] In some embodiments, for the fixed roll 200, the first calendering roll 300 and the second calendering roll 400, the ratio of the outer diameters of the two adjacent rolls according to the material feeding sequence is within the range of 1:3 to 1:1.

[0076] Specifically, such as Figures 5-6 As shown, according to the material feeding sequence, when the diameter ratio of two adjacent pressure rollers is small, a greater extrusion force can be generated between the two pressure rollers, thereby more effectively calendering the material film 106. According to the material feeding sequence, when the outer diameters of the fixed roller 200, the first calendering roller 300, and the second calendering roller 400 increase sequentially according to the material feeding sequence, the diameter ratio between adjacent rollers decreases. At this time, the efficiency ratio of the film pressing system 10 is higher, and the film pressing system 10 can generate a greater extrusion force while consuming the same amount of energy. However, according to... Figure 5 It can be seen that when the roller diameter ratio exceeds 1:3, the efficiency of the film pressing system 10 decreases. In other words, the film pressing system 10 requires more power to generate the same extrusion force, which is not conducive to the preparation of the material film 106. Therefore, according to the material feeding sequence, when the outer diameter ratio of two adjacent rollers among the fixed roller 200, the first calendering roller 300 and the second calendering roller 400 is within the range of 1:3 to 1:1, the calendering effect on the material film 106 is better and the efficiency is higher.

[0077] In some embodiments, the outer diameter of the film-forming roller 100 is the same as the outer diameter of the stationary roller 200.

[0078] Specifically, such as Figure 1 , Figure 2 as well as Figure 11 As shown, the first roller gap 101 formed between the film-forming roller 100 and the stationary roller 200 is mainly used to bite in the material and pre-press it into a material film 106. Excessive extrusion force is not required. Therefore, the film-forming roller 100 and the stationary roller 200 can be set to the same outer diameter. In addition, when the outer diameter of the film-forming roller 100 is the same as that of the stationary roller 200, the same outer diameter can ensure that the extrusion force applied when biting in the material is more uniform, prevent the material from shifting or being subjected to uneven force when entering the roller gap between the two, and ensure that the material can enter the roller gap smoothly and be initially formed.

[0079] In some embodiments, the linear speeds of the film-forming roller 100, the stationary roller 200, the first calendering roller 300, and the second calendering roller 400 increase sequentially according to the material feeding order.

[0080] Specifically, by increasing the linear speeds of the film-forming roller 100, the stationary roller 200, the first calendering roller 300, and the second calendering roller 400 sequentially according to the material feeding order, the material film 106 can adhere to the surfaces of the stationary roller 200, the first calendering roller 300, and the second calendering roller 400 during the transport process and can move rapidly accordingly. This helps to improve the stretching and film-forming effects of the material film 106, ensuring that it forms uniformly and stably during the preparation process, and improving the quality and consistency of the final product.

[0081] In some embodiments, for the film forming roll 100, the stationary roll 200, the first calendering roll 300 and the second calendering roll 400, the ratio of the linear velocities of two adjacent rolls in the material feeding sequence is within the range of 2 to 4.

[0082] Specifically, according to the material feeding sequence, the ratio of the linear velocities of adjacent two rollers among the film forming roller 100, stationary roller 200, first calendering roller 300 and second calendering roller 400 is within the range of 2 to 4; more specifically, when the ratio of the linear velocities of adjacent two rollers among the film forming roller 100, stationary roller 200, first calendering roller 300 and second calendering roller 400 is greater than or equal to 2, it can be ensured that the material film 106 is always attached to the surface of the rollers in the feeding direction, thereby enabling smooth transmission along the feeding direction.

[0083] More specifically, when the ratio of the linear velocities of two adjacent rollers in the film-forming roller 100, stationary roller 200, first calendering roller 300, and second calendering roller 400 is less than or equal to 4, the excessive difference in frictional force experienced by the material film 106 on the surfaces of different rollers can be avoided, preventing problems such as local thinning or even breakage of the material film 106. This ensures the transmission stability of the material film 106 and protects its structural integrity, which helps to optimize the preparation process of the material film 106.

[0084] In some embodiments, the film pressing system 10 further includes a first cutter 510 and / or a second cutter 520. The first cutter 510 abuts against the circumferential surface of the stationary roller 200 to cut off the edge portion of the material film 106 conveyed by the stationary roller 200. The first cutter 510 is movably disposed in the direction extending along the central axis of the stationary roller 200. The second cutter 520 abuts against the circumferential surface of the second calendering roller 400 to cut off the edge portion of the material film 106 conveyed by the second calendering roller 400. The second cutter 520 is movably disposed in the direction extending along the central axis of the second calendering roller 400.

[0085] like Figure 1 and Figure 11As shown, during the preparation of the material film 106, the material is extruded into an initial material film 106 through the first roll gap 101 between the film-forming roller 100 and the calendering roller. Subsequently, the material film 106 passes sequentially through the second roll gap 102 between the stationary roller 200 and the first calendering roller 300, and the third roll gap 103 between the first calendering roller 300 and the second calendering roller 400. Under the gradually increasing extrusion pressure, the material film 106 not only gradually lengthens but also continuously thins. During the calendering process, its width also changes. To ensure that the edges of the material film 106 are neat and its width meets actual requirements, the film pressing system 10 can be equipped with a first cutter 510 and / or a second cutter 520 to cut off the edge area of ​​the material film 106. This allows for precise control of the width of the material film 106, helping to maintain the dimensional accuracy and appearance quality of the material film 106.

[0086] Specifically, such as Figure 1 and Figure 11 As shown, the material is extruded by the film-forming roller 100 and the stationary roller 200 to form a material film 106, which is then conveyed by the friction of the surface of the stationary roller 200. Therefore, the first cutter 510 can abut against the circumferential surface of the stationary roller 200. Specifically, when the stationary roller 200 rotates, the first cutter 510 moves relative to the surface of the stationary roller 200, thereby accurately removing excess material in the edge area of ​​the material film 106 to ensure the neatness of the edge of the material film 106. At the same time, it also limits its width, which is beneficial to the further processing and treatment of the material film 106 and ensures the quality and dimensional accuracy of the material film 106.

[0087] Furthermore, the first cutter 510 is movable along the central axis of the fixed roller 200, so that the position of the first cutter 510 can be flexibly adjusted according to actual needs to control the amount of material film 106 cut off from the edge area, ensuring that the edge area of ​​the material film 106 is precisely trimmed, while effectively managing its width, which is conducive to improving the processing quality and consistency of the material film 106.

[0088] Specifically, such as Figure 1 and Figure 11 As shown, after the material is squeezed by the first calendering roller 300 and the second calendering roller 400, it is then conveyed by the second calendering roller 400. Therefore, the second cutter 520 can abut against the circumferential surface of the fixed roller 200. Specifically, when the second calendering roller 400 rotates, the second cutter 520 moves relative to the surface of the fixed roller 200, which can accurately remove excess material in the edge area of ​​the material film 106, so as to adjust the width of the material film 106 and ensure that the material film 106 has good dimensional accuracy.

[0089] Furthermore, the second cutter 520 is movable along the central axis of the fixed roller 200, so the position of the second cutter 520 can be flexibly adjusted according to actual needs to control the amount of material film 106 cut off from the edge area, which can effectively manage the width of the material film 106 and improve the processing quality of the material film 106.

[0090] Furthermore, a collector 530 is provided below both the first cutter 510 and the second cutter 520 to collect and utilize the cut material.

[0091] It should be noted that the material cut off by the first cutter 510 retains its chemical properties because it has not undergone significant extrusion pressure during calendering, and therefore can be directly reused after recycling. However, the material cut off by the second cutter 520 has undergone multiple calendering processes, resulting in increased compaction density and potential changes in its chemical properties. Therefore, the material cut off by the second cutter 520 needs to be tested to confirm its physical and chemical state before appropriate physical or chemical methods are used for processing and recycling based on the test results. This ensures the quality and safety of the recycled material, improves resource utilization, and reduces production costs.

[0092] In some embodiments, the circumferential surfaces of the film forming roller 100, the stationary roller 200, the first calendering roller 300, and the second calendering roller 400 are all provided with a wear-resistant layer 600, and the thickness of the wear-resistant layer 600 increases sequentially according to the material feeding order.

[0093] During the preparation of the material film 106, in order to gradually thin the material film 106, the extrusion pressure applied to the material film 106 by the film-forming roller 100, the stationary roller 200, the first calendering roller 300, and the second calendering roller 400 gradually increases. Therefore, by providing a wear-resistant layer 600 on the circumferential surface of each roller, and by increasing the thickness of the wear-resistant layer 600 sequentially according to the material feeding sequence, it can be ensured that the wear resistance of each roller surface is compatible with the extrusion pressure it bears, so that the wear degree of each roller is relatively balanced, reducing the wear on subsequent rollers in the equipment, extending the service life of the electrode manufacturing system, and ensuring the stable operation of the film pressing system 10.

[0094] Furthermore, the wear-resistant layer 600 can be a ceramic coating or a silicon coating with high friction and low viscosity characteristics. Taking the ceramic coating as an example, it can not only provide good friction to ensure stable material transfer during calendering, but also has excellent anti-stick properties, effectively preventing material from adhering to the surface of the pressure roller. In addition, the wear-resistant layer 600 with low viscosity characteristics reduces the adhesion of the material film 106 to the surface of the wear-resistant layer 600, improves the consistency of the film thickness of the material film 106, and optimizes the calendering effect, thereby improving the forming quality of the material film 106.

[0095] By selecting such wear-resistant layer 600 material, it is possible to reduce defects caused by adhesion while ensuring efficient calendering, thus ensuring a smooth and consistent electrode fabrication process.

[0096] This application also provides another film pressing system 10, which has good wear resistance, ensures the calendering quality of the material film 106, and extends the service life of the equipment, specifically in conjunction with... Figures 1-11 The content shown provides a detailed description of the film pressing system 10.

[0097] A film pressing system 10 includes a film forming roller 100, a stationary roller 200, a first calendering roller 300, and a second calendering roller 400 arranged sequentially according to the material feeding sequence; wherein, the circumferential surfaces of the film forming roller 100, the stationary roller 200, the first calendering roller 300, and the second calendering roller 400 are all provided with a wear-resistant layer 600, and the thickness of the wear-resistant layer 600 increases sequentially according to the material feeding sequence.

[0098] Please refer to the details. Figure 10 , Figure 10 This is a schematic diagram showing the location of the wear-resistant layer 600 in an embodiment of this application.

[0099] like Figure 1 , Figure 2 , Figure 10 and Figure 11 As shown, the film pressing system 10 includes multiple pressure rollers arranged sequentially according to the material feeding order. These rollers are a film-forming roller 100, a stationary roller 200, a first calendering roller 300, and a second calendering roller 400. Specifically, a first roller gap 101 is formed between the film-forming roller 100 and the stationary roller 200 to initially bite into the material and pre-press it to form an initial material film 106. As the stationary roller 200 rotates, the initial material film 106 is introduced into the second roller gap 102 formed between the stationary roller 200 and the first calendering roller 300, and then... The second roll gap 102 applies extrusion pressure to further thin the material film 106 and increase its compaction density. Then, the material film 106 enters the third roll gap 103 formed by the first calendering roll 300 and the second calendering roll 400 as the first calendering roll 300 rotates. At this stage, the first calendering roll 300 and the second calendering roll 400 apply greater extrusion pressure to the material film 106 to further thin it and significantly increase its compaction density, thus ensuring the quality and performance of the final electrode film.

[0100] Specifically, according to the material feeding direction, as the thickness of the material film 106 gradually decreases, the extrusion pressure applied to the material film 106 by each pressure roller gradually increases. To cope with this increasing extrusion pressure and reduce wear, wear-resistant layers 600 can be provided on the circumferential surfaces of the film-forming roller 100, the stationary roller 200, the first calendering roller 300, and the second calendering roller 400, with the thickness of each wear-resistant layer 600 increasing sequentially according to the material feeding order, thereby increasing the wear resistance of each pressure roller surface. More specifically, such as... Figure 10 As shown, by increasing the thickness of the wear-resistant layer 600 of the film-forming roller 100, stationary roller 200, first calendering roller 300 and second calendering roller 400 sequentially according to the material feeding order, not only is the wear resistance of the roller surface enhanced and the wear of the roller surface by the material during calendering reduced, but the thickness of the wear-resistant layer 600 of each roller is also proportional to the extrusion pressure applied to the material film 106, ensuring that the wear of each roller is relatively balanced, reducing the wear on subsequent rollers in the equipment, thereby extending the service life of the electrode manufacturing system and ensuring that the electrode manufacturing system maintains stable performance during long-term operation.

[0101] Furthermore, according to the material feeding sequence, the thickness of the wear-resistant layer 600 of the film-forming roller 100, the stationary roller 200, the first calendering roller 300 and the second calendering roller 400 is proportional to the surface friction coefficient of the corresponding wear-resistant layer 600.

[0102] Specifically, such as Figure 1 As shown, following the material feeding sequence, as the thickness of the material film 106 gradually decreases, the extrusion pressure applied to the material film 106 by each pressure roller gradually increases. This increasing extrusion pressure makes the surface of the material film 106 more prone to adhesion to the surface of the wear-resistant layer 600, thus hindering the removal and calendering of the material film 106 and increasing the operational difficulty during the preparation process. By employing a wear-resistant layer 600 whose thickness is inversely proportional to the surface friction coefficient, the surface friction coefficient of the wear-resistant layer 600 on each pressure roller decreases sequentially as the thickness of the wear-resistant layer 600 on the film-forming roller 100, stationary roller 200, first calendering roller 300, and second calendering roller 400 increases sequentially. This allows the wear-resistant layer 600 subjected to greater extrusion pressure to have a lower friction coefficient, improving the rationality of the wear-resistant layer 600 configuration, reducing roller sticking caused by excessive extrusion pressure, lowering the probability of abnormal operating conditions during electrode preparation, helping to maintain good transfer performance of the material film 106, and improving the smoothness of the material film 106 preparation process.

[0103] In some embodiments, the thickness of the wear-resistant layer 600 of the film-forming roll 100, the stationary roll 200, the first calendering roll 300 and the second calendering roll 400 is 0.1 mm to 0.3 mm.

[0104] For any of the film-forming rolls 100, stationary roll 200, first calendering roll 300, and second calendering roll 400, the thickness of the wear-resistant layer 600 can be set to any value between 0.1 mm and 0.3 mm. For example, taking the stationary roll 200 as an example, since the extrusion force applied by the stationary roll 200 to the material film 106 is relatively small, the wear degree of the material film 106 on the stationary roll 200 is low. Therefore, a wear-resistant layer 600 with a thickness of 0.1 mm or more can be selected. This thickness of wear-resistant layer 600 can resist minor wear without excessively increasing costs or affecting the performance of the stationary roll 200.

[0105] Furthermore, when a wear-resistant layer 600 with a thickness inversely proportional to its surface friction coefficient is used, a thinner wear-resistant layer 600 can give the surface of the fixed roll 200 a higher surface friction coefficient, which helps to enhance the friction between the circumferential surface of the fixed roll 200 and the material film 106, ensuring that the material film 106 can be smoothly and stably transferred to the second roll gap 102 between the fixed roll 200 and the first calendering roll 300.

[0106] For example, taking the first calendering roll 300 as an example, since the first calendering roll 300 applies a large extrusion force to the material film 106, the wear of the material film 106 on the first calendering roll 300 is relatively severe. Therefore, a wear-resistant layer 600 with a thickness of less than 0.3 mm can be selected. This thickness can effectively resist relatively severe wear without excessively affecting the overall performance of the first calendering roll 300.

[0107] Furthermore, when a wear-resistant layer 600 with a thickness inversely proportional to its surface friction coefficient is used, a thicker wear-resistant layer 600 can reduce the surface friction coefficient of the first calender roll 300 relative to the stationary roll 200. That is, the surface friction coefficient is relatively low, which makes the surface of the first calender roll 300 smoother than that of the stationary roll 200. This helps to reduce the friction between the circumferential surface of the first calender roll 300 and the material film 106, avoids the material film 106 sticking to the roll due to large extrusion pressure, and ensures that the material film 106 can be smoothly detached from its surface and continue to be transported. This is beneficial to ensuring the efficient and smooth operation of the film pressing system 10.

[0108] In some embodiments, the ratio of the thickness of the wear-resistant layer 600 of two adjacent rolls in the order of material feeding, namely the film-forming roll 100, the stationary roll 200, the first calendering roll 300 and the second calendering roll 400, is within the range of 1:1.5 to 1:1.05.

[0109] Following the material feeding sequence, as the extrusion pressure applied to the material film 106 increases, the thickness of the wear-resistant layer 600, used to resist wear, also increases sequentially. Among the film-forming roller 100, stationary roller 200, first calendering roller 300, and second calendering roller 400, the ratio of the thickness of the wear-resistant layer 600 between adjacent rollers is within the range of 1:1.5 to 1:1.05, resulting in a stepped distribution among the rollers and a sequentially increasing ability of each roller to resist extrusion pressure. Specifically, taking the stationary roller 200 and the first calendering roller 300 as examples, when the ratio of the thickness of the wear-resistant layer 600 between the stationary roller 200 and the first calendering roller 300 is greater than 1:1.5, the increased difference in the thickness of the wear-resistant layers 600 significantly enhances the extrusion capacity of the first calendering roller 300 on the material film 106, thereby effectively increasing the compaction density of the material film 106. This makes the film pressing system suitable for applications requiring high-strength compaction.

[0110] Conversely, when the thickness ratio of the wear-resistant layer 600 of the fixed roll 200 to that of the first calendering roll 300 is less than 1:1.05, the small thickness difference of the wear-resistant layers 600 of the two rolls is conducive to achieving stable extrusion of the material film 106, ensuring the consistency and precision of the calendering process, thereby guaranteeing the calendering effect and quality of the material film 106.

[0111] In some embodiments, the thicknesses of the wear-resistant layers 600 of the film-forming roller 100, the stationary roller 200, the first calendering roller 300, and the second calendering roller 400 are in an arithmetic sequence according to the material feeding order; or the thicknesses of the wear-resistant layers 600 of the film-forming roller 100, the stationary roller 200, the first calendering roller 300, and the second calendering roller 400 are in a geometric sequence according to the material feeding order.

[0112] Specifically, by setting the thickness of the wear-resistant layer 600 of the film-forming roller 100, stationary roller 200, first calendering roller 300, and second calendering roller 400 to an arithmetic or geometric sequence according to the material feeding order, it is possible to ensure that the wear resistance and friction coefficient of each roller change in a regular manner. This is beneficial for optimizing the wear protection effect among the rollers, allowing each roller to receive appropriate protection based on its specific role in the preparation of the material film 106. More specifically, since the friction coefficient of the rollers changes in a regular manner, the stability of the material film 106 during the transmission process can be improved. At the same time, the use of an arithmetic or geometric sequence-increasing thickness configuration helps to balance the workload of each roller, reduce the occurrence of abnormal operating conditions, and thus improve the production efficiency of the material film 106 and the quality of electrode preparation.

[0113] For example, when the thickness of the wear-resistant layer 600 of the film-forming roller 100, the stationary roller 200, the first calendering roller 300 and the second calendering roller 400 increases sequentially in an arithmetic sequence according to the material feeding order, the thickness of the film-forming roller 100, the stationary roller 200, the first calendering roller 300 and the second calendering roller 400 can be 0.15mm, 0.18mm, 0.21mm and 0.23mm respectively, and the tolerance of the arithmetic sequence is 0.3.

[0114] For example, when the thickness of the wear-resistant layer 600 of the film-forming roller 100, the stationary roller 200, the first calendering roller 300 and the second calendering roller 400 increases in a geometric sequence according to the material feeding order, the thicknesses of the film-forming roller 100, the stationary roller 200, the first calendering roller 300 and the second calendering roller 400 can be 0.15mm, 0.18mm, 0.216mm and 0.2592mm respectively, and the common ratio of the geometric sequence is 1.2.

[0115] In some embodiments, when there is only one first calendering roll 300 and one second calendering roll 400, the ratio of the thickness of the wear-resistant layer 600 of the two adjacent rolls in the order of material feeding in the film forming roll 100, the stationary roll 200, the first calendering roll 300 and the second calendering roll 400 is within the range of 65% to 75%.

[0116] Specifically, such as Figure 1 and Figure 2 As shown, when the pressing system 10 has a first calendering roller 300 and a second calendering roller 400, the number of rollers is relatively small, that is, the number of times the extrusion pressure is applied to the material film 106 is small. Therefore, in order to ensure that the thickness of the material film 106 is reduced to the target value, the difference in the extrusion pressure applied to the material film 106 by the adjacent rollers is relatively large, which in turn makes the thickness difference of the wear-resistant layer 600 of the two adjacent rollers large. More specifically, in this case, according to the material feeding sequence, the ratio of the thickness of the wear-resistant layer 600 between adjacent rollers in the film-forming roller 100, stationary roller 200, first calendering roller 300, and second calendering roller 400 can be set within the range of 65% to 75%, so that the difference between the thickness of the wear-resistant layer 600 of adjacent rollers is appropriately increased. This not only ensures that each roller receives appropriate wear protection, but also optimizes the compaction effect on the material film 106 and ensures its compaction density as the thickness of the wear-resistant layer 600 increases moderately. In addition, when a wear-resistant layer 600 with a thickness inversely proportional to its surface friction coefficient is used, the steady increase in the friction coefficient of the wear-resistant layer 600 of each roller as the thickness of the wear-resistant layer 600 increases can also gradually reduce the problem of roller sticking and the risk of tearing.

[0117] For example, when the film pressing system 10 has a first calendering roller 300 and a second calendering roller 400, the thickness of the wear-resistant layer 600 of the film forming roller 100, the stationary roller 200, the first calendering roller 300 and the second calendering roller 400 are 0.1 mm, 0.15 mm, 0.2 mm and 0.3 mm respectively according to the material feeding sequence.

[0118] In some embodiments, when at least one of the first calendering roll 300 and the second calendering roll 400 is at least two, the first calendering roll 300 and the second calendering roll 400 are arranged alternately, and the ratio of the thickness of the wear-resistant layer 600 of the two adjacent rolls in the order of material feeding, including the film forming roll 100, the stationary roll 200, the first calendering roll 300 and the second calendering roll 400, is within the range of 75% to 85%.

[0119] Specifically, when at least one of the first calendering roller 300 and the second calendering roller 400 in the pressing system 10 is set to at least two, the number of rollers is relatively large, that is, the number of times the extrusion pressure is applied to the material film 106 is large. Therefore, in order to ensure that the material film 106 has a uniform compaction density, the difference in the extrusion pressure applied to the material film 106 by the adjacent rollers is relatively small, thereby making the difference in the thickness of the wear-resistant layer 600 of the two adjacent rollers small. More specifically, in this case, the first calendering roll 300 and the second calendering roll 400 are arranged alternately. According to the material feeding sequence, the thickness ratio of the wear-resistant layer 600 between adjacent rolls of the film forming roll 100, the stationary roll 200, and the alternately arranged first calendering roll 300 and second calendering roll 400 can be set within the range of 75% to 85%. As the thickness of the wear-resistant layer 600 increases moderately, the material film 106 can undergo multiple gradual pressing processes, so that it can be fully and uniformly compacted, ensuring the compaction degree and consistency of the material film 106. In addition, when a wear-resistant layer 600 with a thickness inversely proportional to its surface friction coefficient is used, as the thickness of the wear-resistant layer 600 increases sequentially, the steady increase of the friction coefficient of the wear-resistant layer 600 of each roll can also gradually reduce the problem of roll sticking and the risk of tearing.

[0120] For example, when the film pressing system 10 has two first calendering rollers 300 and two second calendering rollers 400, the thickness of the wear-resistant layer 600 of the film forming roller 100, the stationary roller 200, and the two alternately arranged first calendering rollers 300 and second calendering rollers 400 is 0.1 mm, 0.12 mm, 0.15 mm, 0.2 mm, 0.25 mm, and 0.3 mm respectively according to the material feeding sequence.

[0121] In some embodiments, the wear-resistant layer 600 is a tungsten carbide layer or a chromium oxide layer.

[0122] For the wear-resistant layer 600, by forming a tungsten carbide layer or a chromium oxide layer on the surface of each pressure roller, the wear resistance of each pressure roller surface can be enhanced, which is beneficial to improving the overall quality of the material film 106 and extending the service life of the film pressing system 10. Taking tungsten carbide as an example, when tungsten carbide is used as the wear-resistant layer 600 of film-forming roller 100, stationary roller 200, first calendering roller 300 and second calendering roller 400, it can effectively protect the surface of each roller and reduce the wear of the material film 106 on the roller. In addition, since the thickness of the tungsten carbide layer is inversely proportional to its surface friction coefficient, that is, the thicker the wear-resistant layer 600 formed by tungsten carbide material, the smaller the surface friction coefficient of the wear-resistant layer 600 and the higher its surface smoothness. Therefore, as the thickness of the tungsten carbide layer increases sequentially according to the material feeding sequence, the surface friction coefficient of film-forming roller 100, stationary roller 200, first calendering roller 300 and second calendering roller 400 decreases sequentially. This can achieve the purpose of preventing the material film 106 from adhering to the surface of the wear-resistant layer 600 under the action of large extrusion pressure and avoid the occurrence of roller sticking.

[0123] Furthermore, for the wear-resistant layer 600, when the thickness of the wear-resistant layer 600 is set within the range of 0.1mm to 0.3mm, the surface hardness of the wear-resistant layer 600 can reach 2000 to 3000Hv to ensure that the surface of each pressure roller has good wear resistance, which will not be elaborated here.

[0124] In some embodiments, the film pressing system 10 further includes a first cutter 510 and / or a second cutter 520; wherein the first cutter 510 abuts against the circumferential surface of the stationary roller 200 to cut off the edge portion of the material film 106 conveyed by the stationary roller 200; the first cutter 510 is movably disposed in the direction extending along the central axis of the stationary roller 200; the second cutter 520 abuts against the circumferential surface of the second calendering roller 400 to cut off the edge portion of the material film 106 conveyed by the second calendering roller 400; and the second cutter 520 is movably disposed in the direction extending along the central axis of the second calendering roller 400.

[0125] like Figure 1 and Figure 11As shown, during the preparation of the material film 106, the material is extruded into an initial material film 106 through the first roll gap 101 between the film-forming roller 100 and the calendering roller. Subsequently, the material film 106 passes sequentially through the second roll gap 102 between the stationary roller 200 and the first calendering roller 300, and the third roll gap 103 between the first calendering roller 300 and the second calendering roller 400. Under the gradually increasing extrusion pressure, the material film 106 not only gradually lengthens but also continuously thins. During the calendering process, its width also changes. To ensure that the edges of the material film 106 are neat and its width meets actual requirements, the film pressing system 10 can be equipped with a first cutter 510 and / or a second cutter 520 to cut off the edge area of ​​the material film 106. This allows for precise control of the width of the material film 106, helping to maintain the dimensional accuracy and appearance quality of the material film 106.

[0126] Specifically, such as Figure 1 and Figure 11 As shown, the material is extruded by the film-forming roller 100 and the stationary roller 200 to form a material film 106. It is then conveyed using the frictional force on the surface of the stationary roller 200, allowing the first cutter 510 to abut against the circumferential surface of the stationary roller 200. Specifically, when the stationary roller 200 rotates, the first cutter 510 moves relative to the surface of the stationary roller 200, thereby precisely removing excess material from the edge area of ​​the material film 106. This ensures the neatness of the edge of the material film 106 and limits its width, facilitating further processing and ensuring the quality and dimensional accuracy of the material film 106. Furthermore, the first cutter 510 is movable along the central axis of the stationary roller 200, allowing its position to be flexibly adjusted according to actual needs to control the amount of material removed from the edge area of ​​the material film 106. This ensures precise trimming of the edge of the material film 106 and effectively manages its width, improving the processing quality and consistency of the material film 106.

[0127] Specifically, such as Figure 1 and Figure 11 As shown, after the material is extruded by the first calendering roller 300 and the second calendering roller 400, it is then conveyed by the second calendering roller 400. Therefore, the second cutter 520 can abut against the circumferential surface of the fixed roller 200. Specifically, when the second calendering roller 400 rotates, the second cutter 520 moves relative to the surface of the fixed roller 200, precisely removing excess material from the edge area of ​​the material film 106. This allows for adjustment of the width of the material film 106, ensuring good dimensional accuracy. Furthermore, the second cutter 520 is movable along the central axis of the fixed roller 200, allowing for flexible adjustment of its position to control the amount of material removed from the edge area of ​​the material film 106. This effectively manages the width of the material film 106 and improves its processing quality.

[0128] In some embodiments, the arrangement direction of the fixed roll 200 and the first calendering roll 300 forms an angle with the arrangement direction of the first calendering roll 300 and the second calendering roll 400. The film forming roll 100 and the first calendering roll 300 are movably arranged relative to the fixed roll 200 in a first direction, and the second calendering roll 400 is movably arranged relative to the fixed roll 200 in both a first direction and a second direction; wherein the second direction is different from the first direction.

[0129] Specifically, such as Figure 1 and Figure 11 As shown, by setting a certain angle between the arrangement direction of the fixed roll 200 and the first calendering roll 300 and the arrangement direction of the first calendering roll 300 and the second calendering roll 400, the second calendering roll 400 is staggered relative to the fixed roll 200. This improves the compactness of the film pressing system 10 and enhances the space utilization of the equipment. At the same time, the staggered arrangement reduces the interference of the adjustment process of the second calendering roll 400 on the roll gap between the first calendering roll 300 and other rolls, which helps to achieve precise control of the roll gap between the first calendering roll 300 and the second calendering roll 400, ensuring coordinated work between the rolls and improving the stability and film forming accuracy of the film pressing system 10.

[0130] In addition, the film-forming roller 100 and the first calendering roller 300 are movable relative to the fixed roller 200 in the first direction, and the second calendering roller 400 is movable relative to the fixed roller 200 in both the first and second directions. This enhances the flexibility of roller gap adjustment between the rollers, helps to achieve precise control of the roller gap, ensures that the material film 106 can obtain the best extrusion effect, helps to optimize the film-forming effect and quality of the material, and improves the stability and ease of operation of the film pressing system 10.

[0131] This application also provides an electrode manufacturing system, such as Figure 11 As shown, the electrode manufacturing system may include the pressing system 10 described in at least one of the above embodiments; specifically, since the electrode manufacturing system has the pressing system 10 described in at least one of the above embodiments, it also has all the advantages and beneficial effects of the pressing system 10.

[0132] In some embodiments, the electrode manufacturing system further includes an unwinding assembly 20 and a spraying assembly 30.

[0133] like Figure 11As shown, the unwinding assembly 20, the spraying assembly 30, and the film pressing system 10 are arranged sequentially according to the conveying order of the current collector 201. Specifically, the current collector 201 can be installed in the unwinding assembly 20 in a roll form. During the electrode preparation process, the unwinding assembly 20 can unwind and release the current collector 201 to achieve the purpose of providing the current collector 201. The spraying assembly 30 has a nozzle structure, which can spray adhesive onto the surface of the current collector 201 during the electrode preparation process to ensure that the material film 106 adheres to the surface of the current collector 201 through the adhesive in subsequent processes. The spraying assembly 30 can spray adhesive onto one side of the current collector 201 through the nozzle structure, or it can spray adhesive onto the opposite sides of the current collector 201.

[0134] Furthermore, at least one guide roller can be provided between the unwinding assembly 20 and the spraying assembly 30, which can be used to change the transmission direction of the current collector 201 so that the unwinding assembly 20, the spraying assembly 30 and the film pressing system 10 are arranged compactly, reducing the space occupied by the electrode manufacturing system; at the same time, the application of the guide roller can also keep the current collector 201 in a taut state during the release process, so as to ensure that the current collector 201 has good flatness.

[0135] Furthermore, a pressure roller group is provided between the unwinding assembly 20 and the spraying assembly 30. During the electrode preparation process, the current collector 201 provided by the unwinding assembly 20 can pass through the pressure roller group. The pressure roller group can squeeze and smooth the current collector 201 provided by the unwinding assembly 20 to ensure that the current collector 201 has good flatness.

[0136] In some embodiments, the electrode manufacturing system includes two pressing systems 10.

[0137] like Figure 11 As shown, two pressing systems 10 are symmetrically distributed on opposite sides of the current collector 201, forming a fourth roll gap 104 between the second calendering rollers 400 of the two pressing systems 10. Specifically, during electrode fabrication, the current collector 201 can penetrate through the fourth roll gap 104, and the second calendering rollers 400 of the pressing system 10 can provide a material film 106 into the fourth roll gap 104. The fourth roll gap 104 is used to compact the material film 106 onto the surface of the current collector 201 and form an electrode layer. More specifically, since the two pressing systems 10 can simultaneously provide the material film 106 on opposite sides of the current collector 201, it helps to improve the electrode fabrication efficiency.

[0138] In some embodiments, the electrode manufacturing system further includes a pressure roller assembly 40, a slitting assembly 50, and a winding assembly 60.

[0139] like Figure 11As shown, the pressing system 10, the pressure roller group 40, the slitting assembly 50, and the winding assembly 60 can be arranged sequentially according to the electrode layer conveying order. Specifically, during the electrode preparation process, the pressing system 10 can press the material film 106 onto the surface of the current collector 201 to form an electrode layer. Then, the electrode layer is conveyed to the roller gap of the pressure roller group 40. The pressure roller group 40 further compresses the electrode layer, which can further compact the material film 106 and make the material film 106 fully adhere to the surface of the current collector 201, improve the adhesion of the material film 106 to the surface of the current collector 201, and ensure that the surface of the electrode layer is smoother.

[0140] Furthermore, after being squeezed by the pressure roller group 40, the electrode layer can be conveyed to the slitting assembly 50 for slitting. Specifically, the slitting assembly 50 can use laser cutting technology with high cutting precision and high energy level for slitting. During the slitting process of the electrode layer, the current collector 201 is slitted into at least two electrodes along the width direction of the electrode layer by laser, so that at least two electrodes can be prepared at the same time to improve the electrode preparation efficiency.

[0141] Furthermore, since the prepared electrodes are relatively long, a winding assembly 60 can be added to the electrode manufacturing system to facilitate the storage of the electrodes. The winding assembly 60 is used to wind and store the prepared electrodes to form a roll, which facilitates the transfer and use of the electrodes. Since the electrode manufacturing system can prepare at least two electrodes at the same time, at least two winding assemblies 60 can be used to wind and store each set of electrodes separately.

[0142] In some embodiments, a surface density measuring device 70 is provided between the pressing system 10 and the pressure roller group 40 and / or between the pressure roller group 40.

[0143] Specifically, the areal density measuring device 70 is mainly used to measure the areal density of the material film 106 on the surface of the current collector 201, so as to determine whether the areal density of the current material film 106 has reached the target threshold, thereby realizing effective detection of electrode quality. Figure 11 As shown, if the areal density measuring device 70 is set between the pressing system 10 and the pressure roller group 40, the areal density of the material film 106 adhered to the surface of the current collector 201 can be measured so as to calculate the difference between the current areal density of the material film 106 and the specified threshold. More specifically, if there is a difference between the areal density and the specified threshold, the pressure roller group 40 can be controlled to apply a suitable extrusion force to the electrode layer so that the extruded electrode layer meets the specified requirements and ensures the product quality of the electrode.

[0144] It should be noted that, since there are material films 106 on both sides of the electrode layer, in order to ensure the quality of the electrode, each areal density measuring device 70 can simultaneously detect the thickness of the material films 106 distributed on both sides of the current collector 201, so as to ensure that the two electrodes obtained have good quality.

[0145] Furthermore, at least one guide roller can be provided between the pressing system 10 and the pressure roller group 40, which can be used to change the conveying direction of the electrode layer, ensure that there is a sufficient transmission distance between the pressing system 10 and the pressure roller group 40, and make the electrode manufacturing system structure more compact; at the same time, the application of the guide roller can also keep the electrode layer in a taut state during the transmission process, ensuring that the electrode layer has good flatness.

[0146] It should be noted that the above description describes some embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0147] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0148] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0149] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0150] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0151] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A press, characterized in that, The film forming roller, the fixed roller, the first calender roller and the second calender roller are arranged in sequence according to the material feeding order. The circumferential surface of the film forming roller, the fixed roller, the first calender roller and the second calender roller is provided with a wear-resistant layer, and the thickness of the wear-resistant layer increases in sequence according to the material feeding order.

2. The film pressing apparatus according to claim 1, wherein The thickness of the wear-resistant layer of the film forming roller, the fixed roller, the first calender roller and the second calender roller is within the range of 0.1mm to 0.3mm.

3. The pad printing apparatus according to claim 1, wherein According to the material feeding order, the thickness of the wear-resistant layer of the film forming roller, the fixed roller, the first calender roller and the second calender roller is inversely proportional to the surface friction coefficient of the corresponding wear-resistant layer.

4. The pad printing apparatus according to claim 1, wherein In the film forming roller, the fixed roller, the first calender roller and the second calender roller, the ratio of the thickness of the wear-resistant layer of the adjacent two according to the material feeding order is within the range of 1:1.5 to 1:1.

05.

5. The film pressing apparatus according to claim 4, wherein The thickness of the wear-resistant layer of the film forming roller, the fixed roller, the first calender roller and the second calender roller is an arithmetic progression according to the material feeding order; or, The thickness of the wear-resistant layer of the film forming roller, the fixed roller, the first calender roller and the second calender roller is a geometric progression according to the material feeding order.

6. The film pressing apparatus according to claim 4, wherein When the first calender roller and the second calender roller are one, the ratio of the thickness of the wear-resistant layer of the adjacent two according to the material feeding order is within the range of 65% to 75%; or, When at least one of the first calender roller and the second calender roller is at least two, the first calender roller and the second calender roller are arranged alternately, and the ratio of the thickness of the wear-resistant layer of the adjacent two according to the material feeding order is within the range of 75% to 85%.

7. The film press apparatus according to any one of claims 1-6, characterized in that, The wear-resistant layer is a tungsten carbide layer or a chromium oxide layer.

8. The film pressing apparatus according to claim 1, wherein Further comprising: A first cutter abutting the circumferential surface of the fixed roller to cut off the edge part of the material film conveyed by the fixed roller; The first cutter is movably arranged in the extension direction of the central axis of the fixed roller; and / or A second cutter abutting the circumferential surface of the second calender roller to cut off the edge part of the material film conveyed by the second calender roller; and the second cutter is movably arranged in the extension direction of the central axis of the second calender roller.

9. The pad printing apparatus of claim 1, wherein The arrangement direction of the fixed roller and the first calender roller has an included angle with the arrangement direction of the first calender roller and the second calender roller, The film forming roller, the first calender roller is movably arranged in the first direction relative to the fixed roller, The second calender roller is movably arranged in the first direction and the second direction relative to the fixed roller; The second direction is perpendicular to the first direction.

10. An electrode manufacturing system characterized by comprising: The film pressing device according to any one of claims 1-9.

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