Electrode forming equipment and coating method

Abstract

The invention discloses electrode forming equipment and a coating method.The electrode forming equipment comprises a double-cone extrusion mechanism, a double-steel-belt calendering mechanism, an edge cutting 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 membranes, and the four-roller mechanism is used for winding and unwinding the membranes; the edge cutting mechanism is used for trimming the edge of a diaphragm, the four-roller mechanism is used for carrying out secondary thinning work on the diaphragm and compounding the diaphragm with a current collector, the winding and unwinding mechanism is used for carrying out winding and unwinding work on a compounded pole piece, and the coating method comprises the following steps of S1, material treatment; s2, preliminarily forming a film; s3, trimming the membrane; s4, carrying out secondary thinning; s5, compounding the surface A; s6, rolling a semi-finished product; s7, unwinding a semi-finished product; s8, compounding the surface B; and S9, rolling a finished product. The film forming quality of the film can be improved, the film forming consistency and uniformity are ensured, the requirement for the compression roller is reduced, and the service life of the compression roller is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production, and in particular to an electrode forming device and a coating method. Background Art

[0002] The dry electrode forming process is widely used in battery production due to its advantages of low cost, environmental protection and high energy density. The dry electrode forming process mainly includes the following steps: mixing and stirring; mixing; film forming; calendering; trimming; compounding, but the current calendering equipment and process still have the following problems:

[0003] (1) The quality of the film is heavily dependent on the amount of binder used, and has high requirements for the pre-treatment process of the powder, such as material dispersion and low shear, otherwise it will lead to poor consistency and uniformity of the film;

[0004] (2) The hardness of the powder material is relatively high, and the pressure roller needs to be rigid enough to meet production requirements. However, even a pressure roller with strong enough rigidity is still prone to wear during use. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides an electrode forming device and a coating method. The coating method uses the electrode forming device to improve the film forming quality of the diaphragm, ensure the consistency and uniformity of the film forming, reduce the requirements for the pressure roller, and extend the service life of the pressure roller.

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

[0007] An electrode forming device comprises a double-cone extrusion mechanism, a double-steel strip calendering mechanism, a trimming mechanism, a four-roll mechanism and a winding and unwinding mechanism, wherein 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 membrane, the trimming mechanism is used to trim the edge of the membrane, the four-roll mechanism is used to perform secondary thinning on the membrane and composite the membrane with a current collector, and the winding and unwinding mechanism is used to roll and unroll the composite electrode.

[0008] The present invention also provides a method for coating the electrode, comprising the following steps:

[0009] S1. Material processing: mixing and extruding the materials;

[0010] S2, preliminary film formation: rolling the extruded material into a film sheet;

[0011] S3, diaphragm trimming: trimming the edges on both sides of the diaphragm;

[0012] S4, secondary thinning: high-precision thinning of the diaphragm;

[0013] S5, A-side composite: combine the membrane and the current collector into a semi-finished product;

[0014] S6, semi-finished product winding: winding the electrode semi-finished product;

[0015] S7, unwinding of semi-finished products: turning over the semi-finished products for unwinding;

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

[0017] S9, finished product winding: winding the pole piece;

[0018] Wherein, in step S1, the material is put into a hopper, and the double-cone extrusion mechanism is arranged in the hopper. The double-cone extrusion mechanism includes a screw, and the material is extruded into agglomerates by shearing of the screw.

[0019] The beneficial effects of the present invention are:

[0020] Provided is an electrode forming device, wherein the material is extruded through a double-cone extrusion mechanism, thereby improving the uniformity and dispersion of the material in a double-steel belt calendering mechanism; the double-steel belt calendering mechanism calenders the material extruded by the double-cone extrusion mechanism into a membrane, and a trimming mechanism trims the edge of the membrane to ensure the consistency of the membrane formation; a four-roller mechanism combines the membrane with a current collector into a semi-finished product, and a winding and unwinding mechanism winds and unwinds the semi-finished electrode sheet or the finished electrode sheet; the double-steel belt calendering mechanism and the four-roller mechanism are arranged to be used in combination to reduce the degree of wear of the roller during use, and the rigidity requirement of the roller is low, thereby extending the service life of the roller;

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

[0022] S7, unwinding of semi-finished product; S8, compounding of B surface; S9, winding of finished product; This method is completed by using the above-mentioned electrode forming equipment, and therefore also has the beneficial effects of the above-mentioned electrode forming equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

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

[0025] Figure 2 It is an overall schematic diagram of the double steel belt calendering mechanism in the present invention;

[0026] Figure 3 is along Figure 2 Sectional view along line AA;

[0027] Figure 4 yes Figure 3 A magnified view of the structure of the middle A part;

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

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

[0030] Figure 7 It is a schematic diagram of the structure of the flip rewinding and unwinding assembly;

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

[0032] Description of reference numerals:

[0033] 1. Double cone extrusion mechanism; 2. Double steel belt calendering mechanism; 2-1. Tension roller group; 2-2. Correction module; 2-3. Calendering roller group; 2-31. Roller; 2-4. Driving roller group; 2-5. Steel belt; 2-6. Heating module; 21. Upper crossbeam; 22. Lower crossbeam; 23. Vertical column; 231. Upper vertical column; 2311. Roller; 2312. Electric cylinder mounting frame; 2313. Electric cylinder; 231 4. Adjusting roller frame; 2315, adjusting roller slider; 2316, adjusting roller; 232, lower vertical column; 233, upper-lower vertical column connecting block; 24, base; 241, conveying trough; 242, lower crossbeam-base connecting block; 25, upper roller; 251, upper steel belt; 26, lower roller; 261, lower steel belt; 27, roller mounting frame; 271, roller scraper; 272, steel belt scraper; 273, roller Installation wall panel; 275, upper roller mounting frame; 2751, upper mounting frame column; 2752, upper open slide rail; 2753, upper roller mounting plate; 2754, upper roller support plate; 27531, upper pulley; 2755, upper baffle; 276, lower roller mounting frame; 2761, lower mounting frame column; 2762, lower open slide rail; 2763, lower roller mounting plate; 2764, lower pulley; 27 65. Lower baffle; 278. Upper-lower roller mounting frame connecting block; 28. Heater; 291. Cylinder; 292. Pressure sensor; 200. Mounting plate; 201. Tensioning roller mounting frame; 202. Slider; 203. Tensioning roller; 204. Tensioning cylinder; 3. Trimming mechanism; 4. Four-roller mechanism; 50. Camera detection assembly; 51. Thickness gauge; 52. Correction assembly; 53. Flipping and rewinding assembly. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the present invention can be combined interchangeably without conflicting with each other.

[0035] Reference Figure 1 The present invention provides an electrode forming device, which includes a double-cone extrusion mechanism 1, a double-steel belt calendering mechanism 2, a trimming mechanism 3, a four-roller mechanism 4 and a winding and unwinding mechanism. The double-cone extrusion mechanism 1 is used to mix and extrude materials, the double-steel belt calendering mechanism 2 is used to calender the extruded materials into a membrane, the trimming mechanism 3 is used to trim the edge of the membrane, the four-roller mechanism 4 is used to perform secondary thinning on the membrane and composite the membrane with a current collector, and the winding and unwinding mechanism is used to wind and unwind the composite electrode.

[0036] The double-cone extrusion mechanism 1 is arranged in a hopper, the hopper is used to put materials, and the double-cone extrusion mechanism includes a screw.

[0037] The double-cone extrusion mechanism 1 can be a conical double-extrusion feeder, and its working principle is mainly to transport the material from the upper hopper to the lower double cone through the rotation of two non-meshing conical screws; the screw structure has a spiral groove and rotates the material forward between the spiral grooves to transport it; before the feeder works, the material needs to be filled into the upper hopper, and due to the effect of gravity, the material will pour into the lower double cone; the barrel is a jacketed welded structure, which can be cooled by water or heated by hot oil / hot water / steam to adjust the temperature to meet the process requirements of various materials; the extrusion section has an important influence, which controls the uniform distribution and pressure during the extrusion process. Different extrusion section designs can achieve precise control of the material flow rate, pressure and temperature; at the same time, it can be made into a quick separation structure, and the equipment can be quickly changed and cleaned.

[0038] The double steel belt calendering mechanism 2 is provided with a diaphragm transmission channel inside, and the upper and lower sides of the diaphragm transmission channel are provided with a tensioning roller group 2-1, a deviation correction module 2-2, a calendering roller group 2-3 and a driving roller group 2-4. The tensioning roller group 2-1, the deviation correction module 2-2 and the calendering roller group 2-3 are arranged in sequence along the transmission direction of the diaphragm, and the driving roller group 2-4 is adjacent to the calendering roller group 2-3 and is arranged on one side of the diaphragm transmission channel.

[0039] The tensioning roller group 2-1 includes a tensioning roller 203, the calendering roller group 2-3 includes a rolling roller 2-31, and the correcting module group 2-2 includes a correcting and adjusting roller 2316; the tensioning roller 203, the rolling roller 2-31 and the adjusting roller 2316 are all in rolling contact with the steel belt 2-5; the function of the tensioning roller group 203 is to tighten the steel belt 2-5 to ensure the straightness of the steel belt surface; the function of the correcting module 2-2 is to prevent the steel belt 2-5 from running off after being straightened, and the steel belt 2-5 can be corrected and kept in the middle of the rolling roller 2-31; the calendering roller group 2-3 applies pressure above the steel belt 2-5 to solve the problem of only applying pressure on the busbar between the rollers, so that the pressure on the steel belt is changed from the steel belt pressing the material to the surface pressure; the driving roller group 2-4 can move at a differential speed, which can further thin the diaphragm and ensure a certain toughness and strength. The double steel belt rolling mechanism 2 also includes a heating module 2-6, and the heating module 2-6 is used to heat the steel belt 2-5, and the steel belt 2-5 then heats the material.

[0040] The four-roll mechanism 4 includes a first roller group, a second roller group, a third roller group and a fourth roller group arranged in sequence along the membrane transmission direction. The second roller group and the third roller group cooperate to perform secondary thinning on the membrane, and the third roller group and the fourth roller group cooperate to compound the current collector and the membrane.

[0041] The calendering roller group 2-3 also includes a roller mounting frame 27; the rolling roller 2-31 includes an upper rolling roller 25 and a lower rolling roller 26 which are parallel to each other, and the upper rolling roller 25 and the lower rolling roller 26 are both mounted on the rolling roller mounting frame 27; the steel strip 2-5 includes an upper steel strip 251 and a lower steel strip 261;

[0042] The upper roller 25 and the lower roller 26 are both rotatably mounted on the roller mounting frame 27; the diaphragm transmission channel is disposed between the upper roller 25 and the lower roller 26;

[0043] Each of the upper rollers 25 is in rolling contact with the upper steel strip 251;

[0044] Each of the lower rollers 26 is in rolling contact with the lower steel strip 261;

[0045] The roller mounting frame 27 is rotatably provided with a roller scraper 271 and a steel belt scraper 272 .

[0046] The roller scraper 271 is used to scrape off excess material on the upper roller 25 or the lower roller 26 , and the steel belt scraper 272 is used to scrape off excess material on the upper steel belt 251 or the lower steel belt 261 .

[0047] Reference Figure 5The roller mounting frame 27 includes an upper roller mounting frame 275 and a lower roller mounting frame 276; the upper roller mounting frame 275 is arranged above the lower roller mounting frame 276; one side of the upper roller mounting frame 275 is fixedly connected to one side of the lower roller mounting frame 276, and the other side of the upper roller mounting frame 275 and the lower roller mounting frame 276 are detachably connected through an upper-lower roller mounting frame connecting block 278;

[0048] The driving roller group 2-4 is fixedly arranged on one side of the upper roller mounting frame 275 and the lower roller mounting frame 276, and the driving roller group 2-4 is arranged away from the upper-lower roller mounting frame connecting block 278. The advantage of only one side of the upper roller mounting frame 275 and the lower roller mounting frame 276 being detachable is that when the steel strip 2-5 is removed, the upper-lower roller mounting frame connecting block 278 is taken out from between the upper roller mounting frame 275 and the lower roller mounting frame 276, and the steel strip 2-5 in the calendering roller group 2-3 can be taken out from the vacant position of the upper-lower roller mounting frame connecting block 278. The fixed connection part of the upper roller mounting frame 275 and the lower roller mounting frame 276 can serve as a stable support, making the operation of removing the steel strip 2-5 more convenient and safe.

[0049] The driving roller group 2-4 is fixedly arranged on one side of the upper roller mounting frame 275 and the lower roller mounting frame 276, which can increase the stability of the fixed connection part between the upper roller mounting frame 275 and the lower roller mounting frame 276, and can reduce the impact on the calendering roller group 2-3 caused by the disassembly of the steel strip 2-5 for maintenance or replacement.

[0050] The diaphragm transmission channel is provided between the upper roller mounting frame 275 and the lower roller mounting frame 276;

[0051] Reference Figure 3 The double steel strip rolling mechanism 2 further 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;

[0052] The upper crossbeam 21 is arranged above the calendering roller group, and the lower crossbeam 22 is arranged below the calendering roller group; 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;

[0053] The diaphragm transmission channel is provided between the upper vertical column 231 and the lower vertical column 232;

[0054] By removing the upper-lower vertical column connecting block 233 and the upper-lower roller mounting frame connecting block 278, the upper steel belt 251 can be removed for easy maintenance.

[0055] Reference Figure 3 A base 24 is provided below the lower cross beam 22, and a transporting slot 241 is provided on the base 24. The transporting slot 241 can be used as a forklift position or a hoisting position to facilitate the movement of the double steel strip calendering mechanism 2.

[0056] A lower steel belt film-forming passage 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 the lower crossbeam 22 and the base 24;

[0057] By removing the lower cross beam-base connection block 242, the upper-lower vertical column connection block 233 and the upper-lower roller mounting frame connection block 278, the lower steel belt 261 can be removed for easy maintenance and replacement.

[0058] The upper cross beam 21 is arranged on both sides of the calendering roller group, and is used to limit the position of the calendering roller group;

[0059] The upper cross beam 21 is detachably connected to the upper vertical column 231, and the roller mounting frame 27 is detachably connected to the lower cross beam 22;

[0060] After removing the upper steel belt 251 and the lower steel belt 261, the upper-lower roller mounting frame connecting block 278 is reset, and then the upper crossbeam 21 is removed, and the calendering roller group can be taken out at one time, so as to facilitate the maintenance and replacement of the calendering roller group;

[0061] Reference Figure 5 Specifically, the upper roller 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 roller 25, an upper roller mounting plate 2753 arranged at both ends of the upper roller 25, and an upper roller support plate 2754 arranged along the axial direction of the upper roller 25;

[0062] The upper open rail 2752 is vertically connected to the upper mounting column 2751 at both ends;

[0063] Both ends of the upper roller 25 are rotatably connected to the upper roller mounting plate 2753;

[0064] The upper roller support plate 2754 is arranged above the upper roller 25, the front and rear ends of the upper roller support plate 2754 are fixedly connected to the upper roller mounting plate 2753, and the left and right sides of the upper roller support plate 2754 are slidably connected to the upper open slide rail 2752;

[0065] The upper roller mounting plate 2753 is detachably connected to the upper mounting frame column 2751 .

[0066] Specifically, upper pulleys 27531 are provided on both sides of the upper roller mounting plate 2753;

[0067] The connection between the upper roller mounting plate 2753 and the upper mounting frame column 2751 is released, and the upper roller mounting plate 2753 is pulled axially along the upper roller 25, which can drive the upper pulley 27531 to slide on the upper open slide rail 2752, so as to pull the upper roller 25 out of the upper roller mounting frame 275, so as to maintain, repair or replace the upper roller 25.

[0068] More specifically, the upper roller mounting frame 275 further includes an upper baffle plate 2755 , one end of which is detachably connected to the upper mounting frame column 2751 , and the other end of the upper baffle plate 2755 is suspended to limit the upper roller mounting plate 2753 .

[0069] Specifically, the lower roller 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 roller 26, and a lower roller mounting plate 2763 arranged at both ends of the lower roller 26;

[0070] The lower open rail 2762 is vertically connected to the lower mounting column 2761 at both ends;

[0071] The lower open slide rails 2762 are arranged on both sides below the axis of the lower roller 26;

[0072] Both ends of the lower roller 26 are rotatably connected to the lower roller mounting plate 2763;

[0073] The lower roller mounting plate 2763 is detachably connected to the lower mounting frame column 2761;

[0074] The lower roller mounting plate 2763 has lower pulleys 2764 on the left and right sides, and the lower pulleys 2764 are slidably disposed on the lower open slide rail 2762;

[0075] The connection between the lower roller mounting plate 2763 and the lower mounting frame column 2761 is released, and the lower roller mounting plate 2763 is pulled axially along the lower roller 26, so that the lower pulley 2764 can slide along the lower open slide rail 2762 to pull the lower roller 26 out of the lower roller mounting frame 276 so as to perform maintenance, repair or replacement work on the lower roller 26.

[0076] More specifically, the lower roller mounting frame 276 further includes a lower baffle plate 2765 , one end of which is detachably connected to the lower mounting frame column 2761 , and the other end of the lower baffle plate 2765 is suspended to limit the lower roller mounting plate 2763 .

[0077] Reference Figure 5 The heating module 2-6 includes a heater 28 and an oil heating flow channel provided in the upper roller and the lower roller. The heater 28 is provided on both sides of the diaphragm transmission 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 belt 251 and the lower steel belt 261. After being heated, the upper steel belt 251 and the lower steel belt 261 transfer heat to the material, heat the material, keep the diaphragm at a high temperature, so that the adhesive in the material can be fully activated, easy to form a film, and prevent the diaphragm from breaking or cracking.

[0078] The rollers are heated by an oil temperature machine to heat the heat transfer oil, which is then transported through oil pipes to the heating channels inside the rollers to heat the rollers.

[0079] Reference Figure 5 , further comprising an oil cylinder 291, a pressure sensor 292, a programmable logic controller, and a servo valve for controlling the liquid output of the oil cylinder 291, which are arranged on the roller mounting frame 27;

[0080] When in use, first set a set value for the output pressure of the oil cylinder, detect the output pressure of the oil cylinder 291 through the pressure sensor 292 and feed it back to the programmable logic controller, compare it with the set value, and then adjust the output pressure of the hydraulic pump by controlling the servo valve in the hydraulic station according to the comparison result, and then adjust the output pressure of the oil cylinder, and perform closed-loop control on the output pressure.

[0081] The tensioning roller assembly includes a tensioning roller mounting frame 201 disposed 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 oil cylinder 204;

[0082] The fixed end of the tensioning cylinder 204 is arranged 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 be extended to tension the upper steel belt 251 or the lower steel belt 261 .

[0083] Specifically, the tensioning 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 diaphragm transmission channel can be adjusted and the thickness of the diaphragm can be controlled by adjusting the position of the tensioning roller mounting frame 201.

[0084] Reference Figure 6 , a mounting plate 200 is provided between adjacent tension roller mounting frames 201, and the deviation correction module includes two electric cylinder mounting frames 2312 provided on the mounting plate 200, an electric cylinder 2313 provided on the electric cylinder mounting frames 2312, an adjusting roller frame 2314 provided on the upper vertical column 231 and the lower vertical column 232, two adjusting roller sliders 2315 slidably provided on the adjusting roller frame 2314, and an adjusting roller 2316 with both ends rotatably connected to the adjusting roller sliders 2315;

[0085] Each of the adjusting roller sliders 2315 is disposed on the output end of each of the electric cylinders 2313 in a one-to-one correspondence;

[0086] The adjusting roller 2316 is in rolling contact with the steel belt;

[0087] When the tension on both sides of the steel strip is inconsistent, the electric cylinder 2313 drives the adjusting roller slider 2315 to change the height position, so that the tension on both sides of the steel strip is consistent, thereby ensuring that the steel strip always remains in the center position of the roller.

[0088] The rewinding 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 flip rewinding and unwinding component 53. The camera detection component 50 is used to detect whether one side of the pole piece is aligned with the foil and whether the two sides of the pole piece are aligned with each other. The thickness gauge 51 is used to detect whether the thickness of the pole piece meets the requirements. The tension swing roller component is used to adjust the tension of the pole piece. The deviation correction component 52 is used to correct the deviation of the pole piece.

[0089] Reference Figure 7 The flip unwinding and reeling assembly 53 includes two oppositely arranged turntables 531, an A unwinding and reeling mechanism 5321 and a B unwinding and reeling mechanism 5322 rotatably arranged on the turntables 531, and the turntables 531 are rotated to adjust the positions of the A unwinding and reeling mechanism 5321 and the B unwinding and reeling mechanism 5322;

[0090] That is, after the membrane is combined with the current collector surface A, the A winding and unwinding mechanism 5321 is wound at the A axis (point a) position, and the B winding and unwinding mechanism 5322 is in standby at the B axis (point b) position;

[0091] After the A winding and unwinding mechanism 5321 completes winding, the turntable 531 rotates to drive 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 and the B surface of the collector are composited, the A winding and unwinding mechanism 5321 starts to unwind, and the B winding and unwinding mechanism 5322 starts to wind.

[0092] The above-mentioned detachable connection method can be any quick-release connection method such as threaded connection, clamp connection, pin connection, etc.

[0093] The present invention also provides a coating method, which uses the electrode forming device described above and specifically comprises the following steps:

[0094] S1. Material processing: mixing and extruding the materials;

[0095] S2, preliminary film formation: rolling the extruded material into a film sheet;

[0096] S3, diaphragm trimming: trimming the edges on both sides of the diaphragm;

[0097] S4, secondary thinning: high-precision thinning of the diaphragm;

[0098] S5, A-side composite: combine the membrane and the current collector into a semi-finished product;

[0099] S6, semi-finished product winding: winding the electrode semi-finished product;

[0100] S7, unwinding of semi-finished products: turning over the semi-finished products for unwinding;

[0101] S8, B side lamination: Lamination of the second side of the semi-finished product;

[0102] S9, finished product winding: winding the electrode.

[0103] In the above step S1, the present invention provides a specific embodiment. In this embodiment, the material is put into a hopper, and a double-cone extrusion mechanism 1 is arranged in the hopper. The material is extruded into a ball through the shearing of the screw in the double-cone extrusion mechanism 1 and conveyed to the double steel belt calendering mechanism 2.

[0104] In the above step S2, the present invention provides a specific embodiment. In this embodiment, the heating module in the double steel belt calendering mechanism 2 can heat the material, so that the adhesive in the material can be fully activated, thereby ensuring the quality of the membrane.

[0105] In this embodiment, before executing step S4, the tension of the trimmed film is controlled to keep the tension on both sides of the film consistent, and then the film is introduced into the four-roller mechanism 4 to ensure the smooth progress of the secondary thinning work.

[0106] In this embodiment, before executing step S5, the current collector needs to be unwound, tension controlled and rectified, and then the current collector is introduced into the four-roll mechanism 4 to achieve composite work on the A side of the current collector.

[0107] In the four-roller mechanism 4, the first steel roller serves as the supporting roller of the four-roller mechanism, and the membrane is introduced by the guide roller to between the second steel roller and the third steel roller, and the second steel roller and the third steel roller cooperate to achieve thinning work, wherein the roller gap adjustment is 0-2mm, the accuracy is ±1um, the coarse adjustment accuracy is 0-20mm, and the accuracy is ±0.1mm. The fourth steel roller serves as a composite roller, and after high-precision thinning, the membrane is transported to between the third steel roller and the fourth steel roller, and the current collector is also introduced between the third steel roller and the fourth steel roller, and the membrane and the current collector are composited on the composite roller.

[0108] In this embodiment, before executing step S8, the thickness gauge 51 is controlled to detect the thickness of the composite electrode sheet, and synchronously feeds back to the four-roller mechanism 4, and synchronously adjusts the gap between the second roller group and the third roller group. A gap sensor is provided at the gap. Specifically, a signal is obtained by the thickness gauge detection, and a signal is fed back after comparison with a preset value. The four-roller mechanism adjusts the gap according to the signal, and then the gap sensor determines the relative error to achieve thickness control. Then, it is transported to the flipping and unwinding assembly 53 through the deviation correction assembly 52. ​​The flipping and unwinding assembly 53 flips the electrode sheet and introduces it into the four-roller mechanism 4 again to be composited with the membrane to achieve composite work on the collector B surface.

[0109] In this embodiment, before executing step S6, the camera detection component 50 is controlled to detect the electrode to determine whether the single side of the electrode is aligned with the foil; before executing step S9, the camera detection component is controlled to detect the electrode to determine whether the AB double sides of the electrode are aligned with each other. The camera detection component 50 includes a first camera, a second camera and a third camera. The principle of judgment is explained here: the first camera takes a single-side picture of the membrane, and the offset is compared and the alignment is adjusted by time and distance. After adjustment, the second camera detects the alignment of the composite A surface of the membrane and the current collector, and the third camera detects the alignment of the composite B surface of the membrane and the current collector. The second camera and the third camera determine the relative alignment of the A surface and the B surface. The alignment requirement is ±0.3mm and the camera accuracy is ±0.1mm. When the alignment changes, the membrane is corrected by the correction mechanism. When it is greater than the required accuracy, the camera detection component needs to be debugged and optimized, and then transported to the flipping and rewinding assembly 53 after passing through the thickness gauge 51 and the correction component 52.

[0110] It can be understood that the material is transported to the double steel belt calendering mechanism 2 via the double cone extrusion mechanism 1, and then transported to the trimming mechanism 3 after preliminary thinning and heating by the double steel belt calendering mechanism 2. The trimming mechanism 3 trims the edge and then introduces it into the four-roll mechanism 4. The four-roll mechanism 4 performs high-precision thinning and then performs composite work with the A side of the current collector. The composited electrode is tested for thickness by the thickness gauge 51, and then transported to the flipping and unwinding assembly 53 through the correction component 52, and the composite process of the A side is completed. The flipping and unwinding assembly 53 flips over and runs again, and transports the B side to the four-roll mechanism 4 for composite work. The composited electrode is checked for double-sided alignment by the camera detection assembly 50, and then passes through the thickness gauge 51 and the correction component 52, and is finally rolled up by the flipping and unwinding assembly 53.

[0111] The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in 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 belt calendering mechanism, a trimming mechanism, a four-roller mechanism and a winding and unwinding mechanism. The double-cone extrusion mechanism is used to mix and extrude the materials, the double-steel belt calendering mechanism is used to calender the extruded materials into a membrane, the trimming mechanism is used to trim the edge of the membrane, the four-roller mechanism is used to perform secondary thinning on the membrane and composite the membrane with the collector, and the winding and unwinding mechanism is used to roll and unroll the composite electrode.

2. An electrode forming device according to claim 1, characterized in that: The double steel belt calendering mechanism comprises a tensioning roller group, a deviation correction module group, a calendering roller group and a driving roller group which are sequentially arranged along the film transmission direction; the tensioning roller group, the deviation correction module group, the calendering roller group and the driving roller group are arranged at the upper and lower sides of the film transmission channel; the tensioning roller group comprises a tensioning roller, the calendering roller group comprises a rolling roller, and the deviation correction module group comprises a correction and adjustment roller; the tensioning roller, the rolling roller and the adjustment roller are all in rolling contact with the steel belt; The double steel belt rolling mechanism comprises a heating module, and the heating module is used to heat the steel belt, and the steel belt heats the material.

3. An electrode forming device according to claim 2, characterized in that: The calendering roller group also includes a roller mounting frame; the rollers include an upper roller and a lower roller parallel to each other, and the upper roller and the lower roller are both mounted on the roller mounting frame; the steel strip includes an upper steel strip and a lower steel strip; The upper roller and the lower roller are both rotatably mounted on the roller mounting frame; the diaphragm transmission channel is disposed between the upper roller and the lower roller; Each of the upper rollers is in rolling contact with the upper steel strip; Each of the lower rollers is in rolling contact with the lower steel strip; A roller scraper and a steel belt scraper are rotatably arranged on the roller mounting frame.

4. An electrode forming device according to claim 3, characterized in that: The roller mounting frame comprises an upper roller mounting frame and a lower roller mounting frame; an upper-lower roller mounting frame connecting block is provided between the upper roller mounting frame and the lower roller mounting frame, and the upper-lower roller mounting frame connecting block is detachably connected to the upper roller mounting frame and the lower roller mounting frame; The diaphragm transmission channel is arranged between the upper roller mounting frame and the lower roller 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 arranged above the calendering roller group, and the lower crossbeam is arranged below the calendering roller group; the upper vertical column is arranged perpendicular to the upper crossbeam and the lower crossbeam and connected to the upper crossbeam; the lower vertical column is arranged perpendicular to the lower crossbeam and the upper crossbeam and 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 arranged between the upper vertical column and the lower vertical column.

5. An electrode forming device according to claim 4, characterized in that: It also includes a base arranged below the lower crossbeam; a lower steel belt film removal 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 blocks are detachably connected to the lower crossbeam and the base.

6. An electrode forming device according to claim 4, characterized in that: One side of the upper roller mounting frame is fixedly connected to one side of the lower roller mounting frame, and the other side of the upper roller mounting frame and the lower roller mounting frame are detachably connected via the upper-lower roller mounting frame connecting block; The driving roller group is fixedly arranged on one side of the upper roller mounting frame and the lower roller mounting frame, and the driving roller group is arranged away from the upper-lower roller mounting frame connecting block.

7. An electrode forming device according to claim 4, characterized in that: The upper crossbeam is arranged on both sides of the calendering roller group, and is used to limit the position of the calendering roller group; The upper cross beam is detachably connected to the upper vertical column, and the roller mounting frame is detachably connected to the lower cross beam.

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

9. An electrode forming device according to claim 4 or 8, characterized in that: The lower roller mounting frame comprises 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 roller, and lower roller mounting plates arranged at both ends of the lower roller; The head and tail ends of the lower open slide rail are vertically connected to the lower mounting frame column; The lower open slide rails are arranged on both sides below the axis of the lower roller; Both ends of the lower roller are rotatably connected to the lower roller mounting plate; The lower roller mounting plate is detachably connected to the lower mounting frame column; The lower rollers are provided on the left and right sides of the lower roller mounting plate, and the lower rollers are slidably arranged on the lower open slide rails.

10. The electrode forming device according to claim 3, characterized in that: The heating module includes a plurality of heaters and oil heating channels disposed in the upper roller and the lower roller; The heater is arranged on both sides of the diaphragm transmission channel and is located between the two upper rollers and the two lower rollers.

11. The electrode forming device according to claim 4, characterized in that: It also includes an oil cylinder, a pressure sensor, a programmable logic controller, and a servo valve for controlling the liquid output of the oil cylinder, which are arranged on the roller mounting frame; The oil cylinder is arranged above the pressure sensor; The servo valve is arranged on the liquid outlet of the oil cylinder; The programmable logic controller is signal-connected to the pressure sensor.

12. The electrode forming device according to claim 4, characterized in that: The tension roller group includes a tension roller mounting frame arranged on the upper vertical column and the lower vertical column, a slider slidably connected to the tension roller mounting frame, a tension roller fixedly connected to the slider at both ends, and a tension oil cylinder; The fixed end of the tensioning oil cylinder is arranged on the tensioning roller mounting frame, and the output end of the tensioning oil cylinder is connected to the sliding block. The tensioning oil cylinder can be extended to tension the upper steel belt or the lower steel belt.

13. An electrode forming device according to claim 12, characterized in that: A mounting plate is provided between adjacent tension roller mounting frames, and the deviation correction module comprises two electric cylinder mounting frames provided on the mounting plate, an electric cylinder provided on the electric cylinder mounting frames, an adjusting roller frame provided on the upper vertical column and the lower vertical column, two adjusting roller sliders slidably provided on the adjusting roller frame, and adjusting rollers whose two ends are rotatably connected to the adjusting roller sliders; Each of the adjusting roller sliders is arranged on the output end of each of the electric cylinders in a one-to-one correspondence; The adjusting roller is in rolling contact with the steel belt.

14. The electrode forming device according to claim 1, characterized in that: The reeling and unwinding mechanism comprises a camera detection component, a thickness gauge, a tension swing roller component, a deviation correction component and a flip reeling and unwinding component. The camera detection component is used to detect whether one side of the pole piece is aligned with the foil and whether both sides of the pole piece are aligned with each other. The thickness gauge is used to detect whether the thickness of the pole piece meets the requirements. The tension swing roller component is used to adjust the tension of the pole piece. The deviation correction component is used to correct the deviation of the pole piece. The flip reeling and unwinding component is used to flip the pole piece to roll the material so that both the AB surface are compounded with the diaphragm. The four-roll mechanism includes a first roller group, a second roller group, a third roller group and a fourth roller group which are arranged in sequence along the transmission direction of the membrane. The first roller group and the second roller group cooperate to reduce the deformation of the second roller group. The second roller group and the third roller group cooperate to perform secondary thinning of the membrane. The third roller group and the fourth roller group are used to cooperate to compound the current collector with the membrane.

15. A coating method applied to the electrode forming device of claims 1 to 14, characterized in that: The steps include: S1. Material processing: mixing and extruding the materials; S2, preliminary film formation: rolling the extruded material into a film sheet; S3, diaphragm trimming: trimming the edges on both sides of the diaphragm; S4, secondary thinning: high-precision thinning of the diaphragm; S5, A-side composite: combine the membrane and the current collector into a semi-finished product; S6, semi-finished product winding: winding the electrode semi-finished product; S7, unwinding of semi-finished products: turning over the semi-finished products for unwinding; S8, B side lamination: Laminating the second side of the semi-finished product; S9, finished product winding: winding the pole piece; Wherein, in step S1, the material is put into a hopper, and the double-cone extrusion mechanism is arranged in the hopper. The double-cone extrusion mechanism includes a screw, and the material is extruded into agglomerates by shearing of the screw.

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