Electrode forming device and coating method

Abstract

The present invention discloses an electrode forming device and a coating method. The electrode forming device comprises a double-cone extrusion mechanism, a double-steel-belt calendering mechanism, an edge trimming mechanism, a four-roller mechanism, and a winding and unwinding mechanism; the double-cone extrusion mechanism is used for mixing and extruding materials; the double-steel-belt calendering mechanism is used for calendering the extruded materials into a film sheet; the edge trimming mechanism is used for trimming the edge of the film sheet; the four-roller mechanism is used for performing a secondary thinning operation on the film sheet and compounding the film sheet with a current collector; and the winding and unwinding mechanism is used for performing winding and unwinding operations on the compounded electrode sheet. The coating method comprises the following steps: S1, material treatment; S2, preliminary film formation; S3, film sheet trimming; S4, secondary thinning; S5, A-side compounding; S6, semi-finished product winding; S7, semi-finished product unwinding; S8, B-side compounding; and S9, finished product winding. The film formation quality of the film sheet can be improved, the consistency and uniformity of film formation can be ensured, the requirements for press rollers can be reduced, and the service life of the press rollers can be prolonged.

Description

An electrode forming device and coating method Technical Field

[0001] This invention relates to the field of lithium battery production technology, and in particular to an electrode forming equipment and coating method. Background Technology

[0002] Dry electrode forming technology is widely used in battery production due to its advantages such as low cost, environmental friendliness, and high energy density. The dry electrode forming process mainly includes the following steps: mixing and stirring; internal mixing; film formation; calendering; trimming; and lamination. However, current calendering equipment and processes still have the following problems:

[0003] (1) The quality of film formation is highly dependent on the amount of binder used, and the pretreatment process of powder is required to be high, such as material dispersion and low shear, otherwise the consistency and uniformity of film formation will be poor.

[0004] (2) The powder material has high hardness, and the pressure roller needs to have sufficient rigidity to meet the production requirements. However, even a pressure roller with sufficient rigidity is still prone to wear during use. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides an electrode forming device and a coating method. The coating method, using the electrode forming device, can improve the film quality of the film, ensure the consistency and uniformity of the film, reduce the requirements on the pressure roller, and extend the service life of the pressure roller.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] An electrode forming device includes a double-cone extrusion mechanism, a double-steel strip calendering mechanism, an edge trimming mechanism, a four-roll mechanism, and a winding and unwinding mechanism. The double-cone extrusion mechanism is used to mix and extrude materials. The double-steel strip calendering mechanism is used to calender the extruded materials into a film. The edge trimming mechanism is used to trim the edges of the film. The four-roll mechanism is used to perform secondary thinning of the film and to composite the film with a current collector. The winding and unwinding mechanism is used to wind and unwind the composite electrode.

[0008] The present invention also provides an application to the above-mentioned electrode forming and coating method, comprising the following steps:

[0009] S1. Material handling: Mixing and extruding materials;

[0010] S2, Preliminary film formation: The extruded material is calendered into a film sheet;

[0011] S3. Membrane trimming: Trim the edges on both sides of the membrane;

[0012] S4. Secondary thinning: High-precision thinning of the membrane;

[0013] S5, A-side composite: Combining the diaphragm with the current collector to form a semi-finished product;

[0014] S6. Semi-finished product winding: Winding up the semi-finished electrode sheets;

[0015] S7. Unwinding of semi-finished products: After flipping the semi-finished products, unwind them.

[0016] S8, B-side lamination: Lamination work on the second side of the semi-finished product;

[0017] S9. Finished product winding: Winding up the electrode sheets;

[0018] In step S1, the material is fed into the hopper, and the double cone extrusion mechanism is set inside the hopper. The double cone extrusion mechanism includes a screw, and the material is extruded into agglomerates by shearing with the screw.

[0019] The beneficial effects of this invention are:

[0020] An electrode forming device is provided, in which material is extruded through a double-cone extrusion mechanism, which improves the uniformity and dispersion of the material in a double-steel strip calendering mechanism; the double-steel strip calendering mechanism calenders the material extruded by the double-cone extrusion mechanism into a film, and the edge trimming mechanism trims the edges of the film to ensure the consistency of film formation; the four-roll mechanism combines the film with the current collector to form a semi-finished product, and the winding and unwinding mechanism winds and unwinds the semi-finished or finished electrode sheet; the combination of the double-steel strip calendering mechanism and the four-roll mechanism reduces the wear of the pressure rollers during use, reduces the rigidity requirements of the pressure rollers, and can extend the service life of the pressure rollers;

[0021] An electrode forming and coating method is provided, comprising: S1, material processing; S2, preliminary film formation; S3, film trimming; S4, secondary thinning; S5, A-side lamination; and S6, semi-finished product winding.

[0022] S7. Unwinding the semi-finished product; S8. B-side lamination; S9. Rewinding the finished product; This method is completed using the electrode forming equipment described above, and therefore also has the beneficial effects of the electrode forming equipment described above. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 is an overall schematic diagram of the electrode forming equipment of the present invention;

[0025] Figure 2 is an overall schematic diagram of the double steel strip rolling mechanism in this invention;

[0026] Figure 3 is a cross-sectional view along line AA in Figure 2;

[0027] Figure 4 is an enlarged view of the structure of part A in Figure 3;

[0028] Figure 5 is a schematic diagram of the structure of one of the calendering roll groups;

[0029] Figure 6 is a schematic diagram of the correction module;

[0030] Figure 7 is a schematic diagram of the structure of the flipping take-up and unwinding assembly;

[0031] Figure 8 is a process flow diagram of the molding method of the present invention;

[0032] Explanation of reference numerals in the attached drawings: 1. Double cone extrusion mechanism; 2. Double steel strip calendering mechanism; 2-1. Tension roller group; 2-2. Correction module; 2-3; Calendering roll assembly; 2-31, Roll; 2-4; Drive roll assembly; 2-5, Steel strip; 2-6, Heating module; 21, Upper crossbeam; 22, Lower crossbeam; 23, Vertical column; 231, Upper vertical column; 2311, Roll; 2312, Electric cylinder mounting frame; 2313, Electric cylinder; 2314, Adjusting roll frame; 2315, Adjusting roll slider; 2316, Adjusting roll; 232, Lower vertical column; 233, Upper-lower vertical column connecting block; 24, Base; 241, Transport trough; 242, Lower crossbeam-base connecting block; 25, Upper roll; 251, Upper steel strip; 26, Lower roll; 261, Lower steel strip; 27, Roll mounting frame; 271, Roll scraper; 272, Steel strip scraper; 273, Roll mounting wall panel; 275, Upper roll mounting frame; 2751. Upper mounting column; 2752. Upper open slide rail; 2753. Upper roll mounting plate; 2754. Upper roll support plate; 27531. Upper pulley; 2755. Upper baffle; 276. Lower roll mounting frame; 2761. Lower mounting column; 2762. Lower open slide rail; 2763. Lower roll mounting plate; 2764. Lower pulley; 2765. Lower baffle; 278. Upper-lower roll mounting frame connecting block; 28. Heater; 291. Hydraulic cylinder; 292. Pressure sensor; 200. Mounting plate; 201. Tensioner roll mounting frame; 202. Slider; 203. Tensioner roll; 204. Tensioner cylinder; 3. Edge trimming mechanism; 4. Four-roll mechanism; 50. Camera detection assembly; 51. Thickness gauge; 52. Deviation correction assembly; 53. Tilting and unwinding assembly. Detailed Implementation

[0033] The following will clearly and completely describe the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in the present invention can be combined interactively without contradicting each other.

[0034] Referring to Figure 1, the present invention provides an electrode forming device, which includes a double-cone extrusion mechanism 1, a double steel strip calendering mechanism 2, an edge trimming mechanism 3, a four-roll mechanism 4, and a winding and unwinding mechanism. The double-cone extrusion mechanism 1 is used to mix and extrude materials. The double steel strip calendering mechanism 2 is used to calender the extruded materials into a film. The edge trimming mechanism 3 is used to trim the edges of the film. The four-roll mechanism 4 is used to perform secondary thinning of the film and to composite the film with a current collector. The winding and unwinding mechanism is used to wind and unwind the composite electrode sheet.

[0035] The double cone extrusion mechanism 1 is disposed in a hopper, which is used to feed materials, and the double cone extrusion mechanism includes a screw.

[0036] The double-cone extrusion mechanism 1 can be a conical double-extrusion feeder. Its working principle is mainly based on the rotation of two non-meshing conical screws to transport materials from the upper hopper to the lower double cone. The screw structure has a spiral groove and transports the material forward through the spiral groove. Before the feeder starts working, the material needs to be filled into the upper hopper. Due to gravity, the material will pour into the lower double cone. The cylinder is a jacketed welded structure that can be cooled by water or heated by hot oil / hot water / steam to regulate the temperature to meet the process requirements of various materials. The extrusion section has an important influence, controlling the uniform distribution and pressure during the extrusion process. Different extrusion section designs can achieve precise control of material flow rate, pressure, and temperature. At the same time, it can be made into a quick-separation structure, which allows for quick changeover and cleaning of the equipment.

[0037] The double steel strip calendering mechanism 2 has a film transport channel inside. The upper and lower sides of the film transport channel are provided with tension roller group 2-1, correction module 2-2, calendering roller group 2-3 and drive roller group 2-4. The tension roller group 2-1, correction module 2-2 and calendering roller group 2-3 are arranged sequentially along the film transport direction. The drive roller group 2-4 is adjacent to the calendering roller group 2-3 and is located on one side of the film transport channel.

[0038] The tensioning roller group 2-1 includes a tensioning roller 203, the calendering roller group 2-3 includes a rolling roll 2-31, and the correction module 2-2 includes a correction and adjustment roller 2316. The tensioning roller 203, the rolling roll 2-31, and the adjustment roller 2316 all roll in contact with the steel strip 2-5. The function of the tensioning roller group 203 is to tighten the steel strip 2-5 to ensure that the steel strip surface is straight. The function of the correction module 2-2 is to prevent the steel strip 2-5 from running off track after it is straightened, and to keep the steel strip 2-5 in the middle of the rolling roll 2-31. The calendering roller group 2-3 applies pressure above the steel strip 2-5, which solves the problem of only applying pressure to the generatrix between the rollers, and changes the pressure on the steel strip from material pressure to surface pressure. The drive roller group 2-4 can move at a differential speed, which can further thin the film and ensure a certain toughness and strength. The double steel strip rolling mechanism 2 also includes a heating module 2-6, which is used to heat the steel strip 2-5, and then the steel strip 2-5 heats the material.

[0039] The four-roll mechanism 4 includes a first roll group, a second roll group, a third roll group, and a fourth roll group arranged sequentially along the film conveying direction. The second roll group and the third roll group cooperate to perform secondary thinning of the film, and the third roll group and the fourth roll group cooperate to composite the current collector with the film.

[0040] The calendering roll group 2-3 also includes a roll mounting frame 27; the rolls 2-31 include an upper roll 25 and a lower roll 26 that are parallel to each other, and both the upper roll 25 and the lower roll 26 are mounted on the roll mounting frame 27; the steel strip 2-5 includes an upper steel strip 251 and a lower steel strip 261;

[0041] The upper roller 25 and the lower roller 26 are both rotatably mounted on the roller mounting frame 27; the film conveying channel is located between the upper roller 25 and the lower roller 26;

[0042] Each of the upper rolls 25 is in rolling contact with the upper steel strip 251;

[0043] Each of the lower rolls 26 makes rolling contact with the lower steel strip 261;

[0044] The roller mounting frame 27 is rotatably equipped with a roller scraper 271 and a steel strip scraper 272.

[0045] The roller scraper 271 is used to scrape off excess material from the upper roller 25 or the lower roller 26, and the steel strip scraper 272 is used to scrape off excess material from the upper steel strip 251 or the lower steel strip 261.

[0046] Referring to Figure 5, the roll mounting frame 27 includes an upper roll mounting frame 275 and a lower roll mounting frame 276; the upper roll mounting frame 275 is disposed above the lower roll mounting frame 276; one side of the upper roll mounting frame 275 is fixedly connected to one side of the lower roll mounting frame 276, and the other side of the upper roll mounting frame 275 and the lower roll mounting frame 276 are detachably connected by an upper-lower roll mounting frame connecting block 278;

[0047] The drive roller assembly 2-4 is fixedly mounted on one side of the upper roll mounting frame 275 and the lower roll mounting frame 276, and the drive roller assembly 2-4 is positioned away from the upper-lower roll mounting frame connecting block 278. The advantage of having only one side of the upper roll mounting frame 275 and the lower roll mounting frame 276 detachable is that when disassembling the steel strip 2-5, the upper-lower roll mounting frame connecting block 278 can be removed from between the upper roll mounting frame 275 and the lower roll mounting frame 276. This allows the steel strip 2-5 in the calendering roll assembly 2-3 to be removed from the empty space of the upper-lower roll mounting frame connecting block 278. The fixed connection between the upper roll mounting frame 275 and the lower roll mounting frame 276 can serve as a stable support, making the disassembly of the steel strip 2-5 more convenient and safer.

[0048] The drive roller assembly 2-4 is fixedly mounted on one side of the upper roll mounting frame 275 and the lower roll mounting frame 276, which can increase the stability of the fixed connection between the upper roll mounting frame 275 and the lower roll mounting frame 276 and reduce the impact on the calendering roller assembly 2-3 caused by the disassembly of the steel strip 2-5 for maintenance or replacement.

[0049] The diaphragm transport channel is located between the upper roll mounting frame 275 and the lower roll mounting frame 276;

[0050] Referring to Figure 3, the double steel strip rolling mechanism 2 also includes an upper crossbeam 21, a lower crossbeam 22, an upper vertical column 231, a lower vertical column 232, and an upper-lower vertical column connecting block 233;

[0051] The upper crossbeam 21 is located above the calendering roll assembly, and the lower crossbeam 22 is located below the calendering roll assembly; the upper vertical column 231 is arranged perpendicular to the upper crossbeam 21 and the lower crossbeam 22 and is connected to the upper crossbeam 21; the lower vertical column 232 is arranged perpendicular to the lower crossbeam 22 and the upper crossbeam 21 and is connected to the lower crossbeam 22; the upper-lower vertical column connecting block 233 is detachably arranged between the upper vertical column 231 and the lower vertical column 232;

[0052] The membrane transmission channel is located between the upper vertical column 231 and the lower vertical column 232;

[0053] By removing the upper-lower vertical column connecting block 233 and the upper-lower roll mounting bracket connecting block 278, the upper steel strip 251 can be removed for easy maintenance.

[0054] Referring to Figure 3, a base 24 is provided below the lower crossbeam 22, and a transport groove 241 is provided on the base 24. The transport groove 241 can be used as a forklift position or a lifting position to facilitate the movement of the double steel strip rolling mechanism 2.

[0055] A lower steel strip film channel is provided between the lower crossbeam 22 and the base 24; a lower crossbeam-base connecting block 242 is provided between the lower crossbeam 22 and the base 24, and the lower crossbeam-base connecting block 242 is detachably connected to both the lower crossbeam 22 and the base 24.

[0056] By removing the lower crossbeam-base connecting block 242, the upper-lower vertical column connecting block 233, and the upper-lower roll mounting bracket connecting block 278, the lower steel strip 261 can be removed for easy maintenance and replacement.

[0057] The upper crossbeam 21 is located on both sides of the calendering roll group and is used to limit the calendering roll group.

[0058] The upper crossbeam 21 is detachably connected to the upper vertical column 231, and the roller mounting frame 27 is detachably connected to the lower crossbeam 22;

[0059] After removing the upper steel strip 251 and the lower steel strip 261, the upper-lower roll mounting bracket connecting block 278 is reset, and then the upper crossbeam 21 is removed. The calender roll group can be taken out at one time to facilitate the maintenance and replacement of the calender roll group.

[0060] Referring to Figure 5, specifically, the upper roll mounting frame 275 includes an upper mounting frame column 2751 arranged parallel to the upper vertical column 231, an upper open slide rail 2752 arranged parallel to the axial direction of the upper roll 25, an upper roll mounting plate 2753 provided at both ends of the upper roll 25, and an upper roll support plate 2754 arranged along the axial direction of the upper roll 25.

[0061] The upper open slide rail 2752 is perpendicularly connected to the upper mounting column 2751 at both ends.

[0062] Both ends of the upper roll 25 are rotatably connected to the upper roll mounting plate 2753;

[0063] The upper roll support plate 2754 is located above the upper roll 25. The front and rear ends of the upper roll support plate 2754 are fixedly connected to the upper roll mounting plate 2753, and the left and right sides of the upper roll support plate 2754 are slidably connected to the upper open slide rail 2752.

[0064] The upper roll mounting plate 2753 is detachably connected to the upper mounting bracket column 2751.

[0065] Specifically, upper pulleys 27531 are provided on both the left and right sides of the upper roll mounting plate 2753;

[0066] Disconnect the upper roll mounting plate 2753 from the upper mounting column 2751, pull the upper roll mounting plate 2753 along the axial direction of the upper roll 25, and drive the upper pulley 27531 to slide on the upper open slide rail 2752 to pull the upper roll 25 out of the upper roll mounting frame 275 for maintenance, repair or replacement of the upper roll 25.

[0067] More specifically, the upper roll mounting frame 275 also includes an upper baffle 2755, one end of which can be detachably connected to the upper mounting frame column 2751, and the other end of which is suspended in the air to limit the upper roll mounting plate 2753.

[0068] Specifically, the lower roll mounting frame 276 includes a lower mounting frame column 2761 arranged parallel to the lower vertical column 232, a lower open slide rail 2762 arranged parallel to the axial direction of the lower roll 26, and a lower roll mounting plate 2763 provided at both ends of the lower roll 26;

[0069] The lower open slide rail 2762 is perpendicularly connected to the lower mounting bracket column 2761 at both ends.

[0070] The lower open slide rail 2762 is located on both sides below the axis of the lower roll 26;

[0071] The two ends of the lower roll 26 are rotatably connected to the lower roll mounting plate 2763;

[0072] The lower roll mounting plate 2763 is detachably connected to the lower mounting bracket column 2761;

[0073] The lower roll mounting plate 2763 has left and right sliding rollers 2764, which are slidably mounted on the lower open slide rail 2762.

[0074] Disconnect the lower roll mounting plate 2763 from the lower mounting bracket column 2761, and pull the lower roll mounting plate 2763 along the axial direction of the lower roll 26. This allows the lower sliding wheel 2764 to slide along the lower open slide rail 2762, thereby removing the lower roll 26 from the lower roll mounting bracket 276 for maintenance, repair, or replacement of the lower roll 26.

[0075] More specifically, the lower roll mounting frame 276 further includes a lower baffle 2765, one end of which is detachably connected to the lower mounting frame column 2761, and the other end of which is suspended in the air to limit the lower roll mounting plate 2763.

[0076] Referring to Figure 5, the heating module 2-6 includes a heater 28 and an oil heating channel disposed within the upper and lower rollers. The heater 28 is located on both sides of the film transport channel and between the two upper rollers and the two lower rollers. Specifically, the heater 28 is an infrared heater, which is used to heat the upper steel strip 251 and the lower steel strip 261. After being heated, the upper steel strip 251 and the lower steel strip 261 transfer heat to the material, heating the material and maintaining the film at a high temperature. This allows the binder in the material to be fully activated, facilitating film formation and preventing film breakage or cracking.

[0077] The rolls are heated by heating the heat transfer oil with an oil temperature controller, and then the oil is transported through oil pipes to the heating channels inside the rolls to heat them.

[0078] Referring to Figure 5, the system also includes a hydraulic cylinder 291, a pressure sensor 292, a programmable logic controller, and a servo valve for controlling the liquid output of the hydraulic cylinder 291, all mounted on the roller mounting frame 27.

[0079] In use, a set value is first set for the output pressure of the hydraulic cylinder. The output pressure of the hydraulic cylinder 291 is detected by the pressure sensor 292 and fed back to the programmable logic controller. The value is compared with the set value. Then, based on the comparison result, the output pressure of the hydraulic pump is adjusted by controlling the servo valve in the hydraulic station, thereby adjusting the output pressure of the hydraulic cylinder and performing closed-loop control of the output pressure.

[0080] The tensioning roller assembly includes a tensioning roller mounting frame 201 mounted on the upper vertical column 231 and / or the lower vertical column 232, a slider 202 slidably connected to the tensioning roller mounting frame 201, a tensioning roller 203 fixedly connected to the slider 202 at both ends, and a tensioning cylinder 204.

[0081] The fixed end of the tensioning cylinder 204 is located on the tensioning roller mounting frame 201, and the output end of the tensioning cylinder 204 is connected to the slider 202. The tensioning cylinder 204 can extend to tension the upper steel strip 251 or the lower steel strip 261.

[0082] Specifically, the tension roller mounting frame 201 is detachably connected to the upper vertical column 231 and / or the lower vertical column 232, so the height of the film transmission channel and the thickness of the film can be adjusted by adjusting the position of the tension roller mounting frame 201.

[0083] Referring to Figure 6, an installation plate 200 is provided between adjacent tension roller mounting frames 201. The correction module includes two electric cylinder mounting frames 2312 on the installation plate 200, an electric cylinder 2313 on the electric cylinder mounting frames 2312, an adjusting roller frame 2314 on the upper vertical column 231 and the lower vertical column 232, two adjusting roller sliders 2315 slidably disposed on the adjusting roller frame 2314, and an adjusting roller 2316 whose two ends are rotatably connected to the adjusting roller sliders 2315.

[0084] Each of the adjusting roller sliders 2315 is correspondingly provided on the output end of each of the electric cylinders 2313;

[0085] The adjusting roller 2316 makes rolling contact with the steel strip;

[0086] When the tension on both sides of the steel strip is inconsistent, the electric cylinder 2313 drives the adjusting roller slider 2315 to change its height position, thereby making the tension on both sides of the steel strip consistent, and thus ensuring that the steel strip always stays in the center position of the roll.

[0087] The winding and unwinding mechanism includes a camera detection component 50, a thickness gauge 51, a tension swing roller component, a deviation correction component 52, and a flipping winding and unwinding component 53. The camera detection component 50 is used to detect whether one side of the electrode sheet is aligned with the foil and whether both sides of the electrode sheet are aligned with each other. The thickness gauge 51 is used to detect whether the thickness of the electrode sheet meets the requirements. The tension swing roller component is used to adjust the tension of the electrode sheet. The deviation correction component 52 is used to perform deviation correction work on the electrode sheet.

[0088] Referring to Figure 7, the flipping take-up and unwind assembly 53 includes two turntables 531 arranged opposite to each other, an A take-up and unwind mechanism 5321 and a B take-up and unwind mechanism 5322 rotatably mounted on the turntables 531, and the turntables 531 are rotated to adjust the positions of the A take-up and unwind mechanism 5321 and the B take-up and unwind mechanism 5322.

[0089] That is, when the diaphragm is combined with the current collector A surface, the A winding and unwinding mechanism 5321 winds up at the A axis (point a) position, and the B winding and unwinding mechanism 5322 is on standby at the B axis (point b) position;

[0090] After the A winding and unwinding mechanism 5321 finishes winding, the turntable 531 rotates, driving the A winding and unwinding mechanism 5321 to the B axis position and the B winding and unwinding mechanism 5322 to the A axis position; at this time, the diaphragm is combined with the B surface of the current collector, the A winding and unwinding mechanism 5321 starts to unwind, and the B winding and unwinding mechanism 5322 performs winding.

[0091] The aforementioned detachable connection method can be any quick-release connection method such as threaded connection, clamp connection, or pin connection;

[0092] The present invention also provides a coating method, wherein the coating method uses the electrode forming equipment described above, and specifically includes the following steps:

[0093] S1. Material handling: Mixing and extruding materials;

[0094] S2, Preliminary film formation: The extruded material is calendered into a film sheet;

[0095] S3. Membrane trimming: Trim the edges on both sides of the membrane;

[0096] S4. Secondary thinning: High-precision thinning of the membrane;

[0097] S5, A-side composite: Combining the diaphragm with the current collector to form a semi-finished product;

[0098] S6. Semi-finished product winding: Winding up the semi-finished electrode sheets;

[0099] S7. Unwinding of semi-finished products: After flipping the semi-finished products, unwind them.

[0100] S8, B-side lamination: Lamination work on the second side of the semi-finished product;

[0101] S9. Finished product winding: The electrode sheets are wound up.

[0102] In step S1 above, the present invention provides a specific embodiment. In this embodiment, the material is fed into a hopper, and a double cone extrusion mechanism 1 is provided in the hopper. The material is extruded into a ball by the screw shearing in the double cone extrusion mechanism 1 and conveyed to the double steel strip calendering mechanism 2.

[0103] In step S2 above, the present invention provides a specific embodiment in which the heating module in the double steel strip calendering mechanism 2 can heat the material, thereby fully activating the binder in the material and ensuring the quality of the film.

[0104] In this embodiment, before performing step S4, the tension of the trimmed film is controlled to ensure that the tension on both sides of the film is consistent, and then the film is introduced into the four-roll mechanism 4 to ensure the smooth progress of the secondary thinning operation.

[0105] In this embodiment, before performing step S5, it is necessary to unwind the current collector, control its tension, and correct its deviation. Then, the current collector is introduced into the four-roll mechanism 4 to achieve composite operation on the surface of the current collector A.

[0106] In the four-roll mechanism 4, the first steel roller serves as the support roller. The diaphragm is guided by the guide roller to the space between the second and third steel rollers, where the thinning process is achieved through the cooperation of the second and third steel rollers. The roller gap adjustment is 0-2mm with an accuracy of ±1µm, and the coarse adjustment accuracy is 0-20mm with an accuracy of ±0.1mm. The fourth steel roller acts as the composite roller. After high-precision thinning, the diaphragm is conveyed to the space between the third and fourth steel rollers, and the current collector is also guided to the space between the third and fourth steel rollers. The diaphragm and the current collector are then composited on the composite roller.

[0107] In this embodiment, before executing step S8, the thickness gauge 51 is controlled to detect the thickness of the composite electrode and simultaneously feeds back to the four-roll mechanism 4. The gap between the second and third roll groups is adjusted synchronously, and a gap sensor is installed at the gap. Specifically, the thickness gauge detects a signal, compares it with a preset value, and feeds back the signal. The four-roll mechanism adjusts the gap based on the signal, and the gap sensor determines the relative error, thus controlling the thickness. The electrode is then transported to the flipping and unwinding assembly 53 via the correction assembly 52. ​​The flipping and unwinding assembly 53 flips the electrode and reintroduces it into the four-roll mechanism 4 to be composited with the film, achieving composite work on the B side of the current collector.

[0108] In this embodiment, before executing step S6, the camera detection component 50 is controlled to detect the electrode sheet to determine whether one side of the electrode sheet is aligned with the foil. Before executing step S9, the camera detection component is controlled to detect the electrode sheet to determine whether the A and B sides of the electrode sheet are aligned with each other. The camera detection component 50 includes a first camera, a second camera, and a third camera. The principle of the judgment is explained as follows: the first camera takes a picture of one side of the film, and then takes another picture to compare the offset and adjust the alignment by time and distance. After adjustment, the second camera detects the alignment of the composite A side of the film sheet with the current collector, and the third camera detects the alignment of the composite B side of the film sheet with the current collector. The second and third cameras determine the relative alignment of the A side and the B side. The alignment requirement is ±0.3mm, and the camera accuracy is ±0.1mm. When the alignment changes, the correction mechanism corrects the film. When the accuracy exceeds the required level, the camera detection component needs to be adjusted and optimized. After passing through the thickness gauge 51 and the correction component 52, the film is transported to the flipping and unwinding component 53.

[0109] Understandably, the material is conveyed from the double-cone extrusion mechanism 1 to the double-strip calendering mechanism 2, where it undergoes initial thinning and heating before being conveyed to the edge trimming mechanism 3. The edge trimming mechanism 3 then trims the edges before guiding the material to the four-roll mechanism 4. The four-roll mechanism 4 performs high-precision thinning before laminating it with the A-side of the current collector. The laminated electrode sheet is then tested for thickness by a thickness gauge 51, and then conveyed to the reversing and unwinding assembly 53 via a web-correcting component 52. This completes the lamination process for the A-side. The reversing and unwinding assembly 53 flips the electrode sheet and feeds it again, conveying the B-side to the four-roll mechanism 4 for lamination. After lamination, the camera detection component 50 checks the alignment of the two sides, and then the material passes through the thickness gauge 51 and the web-correcting component 52 before finally being wound up by the reversing and unwinding assembly 53.

[0110] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. An electrode forming device, characterized in that, It includes a double-cone extrusion mechanism, a double-steel strip calendering mechanism, an edge trimming mechanism, a four-roll mechanism, and a winding and unwinding mechanism. The double-cone extrusion mechanism is used to mix and extrude materials. The double-steel strip calendering mechanism is used to calender the extruded materials into a film. The edge trimming mechanism is used to trim the edges of the film. The four-roll mechanism is used to perform secondary thinning of the film and to composite the film with the current collector. The winding and unwinding mechanism is used to wind and unwind the composite electrode.

2. The electrode forming equipment according to claim 1, characterized in that, The double steel strip calendering mechanism includes a tension roller group, a correction module group, a calendering roller group, and a drive roller group arranged sequentially along the film conveying direction. The tension roller group, correction module group, calendering roller group, and drive roller group are disposed on the upper and lower sides of the film conveying channel. The tension roller group includes a tension roller, the calendering roller group includes a roll, and the correction module includes an adjustment roller. The tension roller, the roll, and the adjustment roller all roll in contact with the steel strip. The double steel strip rolling mechanism includes a heating module, which is used to heat the steel strip, thereby heating the material.

3. The electrode forming equipment according to claim 2, characterized in that: The rolling mill roll assembly also includes a roll mounting frame; the rolls include an upper roll and a lower roll that are parallel to each other, and both the upper roll and the lower roll are mounted on the roll mounting frame; the steel strip includes an upper steel strip and a lower steel strip; Both the upper and lower rollers are rotatably mounted on the roller mounting frame; the film conveying channel is located between the upper and lower rollers; Each of the upper rolls makes rolling contact with the upper steel strip; Each of the lower rolls makes rolling contact with the lower steel strip; The roller mounting frame is equipped with a roller scraper and a steel strip scraper that rotate.

4. The electrode forming equipment according to claim 3, characterized in that: The roll mounting frame includes an upper roll mounting frame and a lower roll mounting frame; an upper-lower roll mounting frame connecting block is provided between the upper roll mounting frame and the lower roll mounting frame, and the upper-lower roll mounting frame connecting block is detachably connected to the upper roll mounting frame and the lower roll mounting frame; The diaphragm transport channel is located between the upper roll mounting frame and the lower roll mounting frame; The double steel strip rolling mechanism also includes an upper crossbeam, a lower crossbeam, an upper vertical column, a lower vertical column, and an upper-lower vertical column connecting block; The upper crossbeam is located above the calendering roll assembly, and the lower crossbeam is located below the calendering roll assembly; the upper vertical column is arranged perpendicular to the upper crossbeam and the lower crossbeam and is connected to the upper crossbeam; the lower vertical column is arranged perpendicular to the lower crossbeam and the upper crossbeam and is connected to the lower crossbeam; the upper-lower vertical column connecting block is detachably connected to the upper vertical column and the lower vertical column. The diaphragm transmission channel is located between the upper vertical column and the lower vertical column.

5. The electrode forming equipment according to claim 4, characterized in that: It also includes a base located below the lower crossbeam; a lower steel strip conveyor channel is provided between the lower crossbeam and the base; a lower crossbeam-base connecting block is provided between the lower crossbeam and the base, and the lower crossbeam-base connecting block is detachably connected to both the lower crossbeam and the base.

6. The electrode forming equipment according to claim 4, characterized in that: One side of the upper roll mounting bracket is fixedly connected to one side of the lower roll mounting bracket, and the other side of the upper roll mounting bracket and the lower roll mounting bracket are detachably connected via the upper-lower roll mounting bracket connecting block. ； The drive roller assembly is fixedly mounted on one side of the upper roll mounting frame and the lower roll mounting frame, and the drive roller assembly is disposed away from the upper-lower roll mounting frame connecting block.

7. The electrode forming equipment according to claim 4, characterized in that: The upper crossbeam is located on both sides of the calendering roll group and is used to limit the calendering roll group. The upper crossbeam is detachably connected to the upper vertical column, and the roller mounting frame is detachably connected to the lower crossbeam.

8. The electrode forming equipment according to claim 4, characterized in that: The upper roll mounting frame includes an upper mounting frame column arranged parallel to the upper vertical column, an upper open slide rail arranged parallel to the axial direction of the upper roll, an upper roll mounting plate located at both ends of the upper roll, and an upper roll support plate arranged along the axial direction of the upper roll. The upper open slide rail is perpendicularly connected to the upper mounting bracket column at both ends. Both ends of the upper roll are rotatably connected to the upper roll mounting plate; The upper roll support plate is located above the upper roll. Both the front and rear ends of the upper roll support plate are fixedly connected to the upper roll mounting plate, and the left and right sides of the upper roll support plate are slidably connected to the upper open slide rail. The upper roll mounting plate is detachably connected to the upper mounting bracket column.

9. An electrode forming apparatus according to claim 4 or 8, characterized in that: The lower roll mounting frame includes a lower mounting frame column arranged parallel to the lower vertical column, a lower open slide rail arranged parallel to the axial direction of the lower roll, and lower roll mounting plates located at both ends of the lower roll. The two ends of the lower open slide rail are perpendicularly connected to the lower mounting bracket column; The lower open slide rail is located on both sides below the lower roll shaft; Both ends of the lower roll are rotatably connected to the lower roll mounting plate; The lower roll mounting plate is detachably connected to the lower mounting bracket column; The lower roll mounting plate has sliding rollers on its left and right sides, which are slidably mounted on the lower open slide rail.

10. An electrode forming apparatus according to claim 3, characterized in that: The heating module includes multiple heaters and oil heating channels disposed in the upper roll and the lower roll; The heater is located on both sides of the diaphragm transport channel and between the two upper rollers and the two lower rollers.

11. The electrode forming equipment according to claim 4, characterized in that: It also includes a hydraulic cylinder, a pressure sensor, a programmable logic controller, and a servo valve for controlling the liquid output of the hydraulic cylinder, all mounted on the roller mounting frame. The hydraulic cylinder is positioned above the pressure sensor; The servo valve is located at the outlet of the oil cylinder; The programmable logic controller is connected to the pressure sensor signal.

12. The electrode forming equipment according to claim 4, characterized in that: The tensioning roller assembly includes a tensioning roller mounting frame disposed on the upper vertical column and the lower vertical column, a slider slidably connected to the tensioning roller mounting frame, a tensioning roller fixedly connected to the slider at both ends, and a tensioning cylinder. The fixed end of the tensioning cylinder is located on the tensioning roller mounting frame, and the output end of the tensioning cylinder is connected to the slider. The tensioning cylinder can extend to tension the upper steel strip or the lower steel strip.

13. The electrode forming equipment according to claim 12, characterized in that: An installation plate is provided between adjacent tension roller mounting frames. The correction module includes two electric cylinder mounting frames on the installation plate, an electric cylinder on the electric cylinder mounting frame, an adjusting roller frame on the upper vertical column and the lower vertical column, two adjusting roller sliders slidably provided on the adjusting roller frame, and an adjusting roller whose two ends are rotatably connected to the adjusting roller sliders. Each of the adjusting roller sliders is correspondingly located on the output end of each of the electric cylinders; The adjusting roller makes rolling contact with the steel strip.

14. The electrode forming equipment according to claim 1, characterized in that, The winding and unwinding mechanism includes a camera detection component, a thickness gauge, a tension swing roller component, a deviation correction component, and a flipping winding and unwinding component. The camera detection component is used to detect whether one side of the electrode sheet is aligned with the foil and whether both sides of the electrode sheet are aligned with each other. The thickness gauge is used to detect whether the thickness of the electrode sheet meets the requirements. The tension swing roller component is used to adjust the tension of the electrode sheet. The deviation correction component is used to perform deviation correction on the electrode sheet. The flipping winding and unwinding component is used to flip the electrode sheet so that both sides A and B are laminated with the film. The four-roll mechanism includes a first roll group, a second roll group, a third roll group, and a fourth roll group arranged sequentially along the film conveying direction. The first roll group and the second roll group cooperate to reduce the deformation of the second roll group. The second roll group and the third roll group cooperate to perform secondary thinning of the film. The third roll group and the fourth roll group are used to cooperate to composite the current collector with the film.

15. A coating method applied to the electrode forming apparatus of claims 1 to 14, characterized in that, Includes the following steps: S1. Material handling: Mixing and extruding materials; S2, Preliminary film formation: The extruded material is calendered into a film sheet; S3. Membrane trimming: Trim the edges on both sides of the membrane; S4. Secondary thinning: High-precision thinning of the membrane; S5, A-side composite: Combining the diaphragm with the current collector to form a semi-finished product; S6. Semi-finished product winding: Winding up the semi-finished electrode sheets; S7. Unwinding of semi-finished products: After flipping the semi-finished products, unwind them. S8, B-side lamination: Lamination work on the second side of the semi-finished product; S9. Finished product winding: Winding up the electrode sheets; In step S1, the material is fed into the hopper, and the double cone extrusion mechanism is set inside the hopper. The double cone extrusion mechanism includes a screw, and the material is extruded into agglomerates by shearing with the screw.

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