Double-sided film-forming dry-method electrode equipment

Abstract

The invention relates to double-sided film forming dry method electrode equipment which is provided with a rack, coating rolling forming assemblies are arranged on the left side and the right side of the rack, a composite forming assembly is installed on the upper portion of the rack, and the composite forming assembly is located between the coating rolling forming assemblies on the two sides. A base material unwinding assembly and a finished product winding assembly are further arranged; a powder forming roller set is arranged on the lower portion of the coating rolling forming assembly, and a coating forming roller set composed of a plurality of rollers is arranged on the upper portion of the coating rolling forming assembly; the coating forming roller set is located above the powder forming roller set, a pressure applying roller is arranged at the top of the coating forming roller set, and vertical pressure applying elements are arranged on the upper sides of the two ends of the pressure applying roller; a plurality of forming rollers are arranged below the pressure applying roller; horizontal swing adjusting mechanisms are arranged at the two ends of the pressing roller, and the axis of the pressing roller is parallel to or horizontally crossed with the axis of the first forming roller. According to the invention, the coating sheet with more excellent performance is obtained, automatic production is realized, and the double-sided film-forming electrode sheet is obtained.

Description

Technical Field

[0001] The present invention relates to a dry preparation device for realizing double-sided film formation of electrodes, belonging to the field of mechanical equipment. Background Art

[0002] An important raw material in a battery is an electrode. Currently, the electrode can be prepared by a dry process, generally by first pressing powder into a sheet through a roller group to form an electrode powder film sheet, then inputting a current collector film, and through a composite roller, pressing together three layers of film materials, namely "electrode powder film sheet - current collector film - electrode powder film sheet", to form a sheet of dry electrode, winding it up, and then producing it into a battery in subsequent production.

[0003] For the dry production process of electrode sheets and production equipment, reference can be made to patent documents such as a dry process pole piece production device with Chinese Patent Publication No. CN222734999U, a dry electrode preparation device with Chinese Patent Publication No. CN222320277U, a dry method pole piece preparation device with Chinese Patent Publication No. CN222300678U, an automated production line for dry method electrodes of a power battery with Chinese Patent Publication No. CN116682929A, a preparation method of a dry method electrode pole piece, an electrode pole piece and its use with Chinese Patent Publication No. CN115621410A, a multi-roll calender for producing electrodes by a dry coating method, a component for laminating electrode paths on both sides of a metal foil, and a production using a multi-roll calender with Chinese Patent Publication No. CN119137756A, an electrode dry roll pressing device and a lithium battery production method with Chinese Patent Publication No. CN119773291A, etc.

[0004] In order to improve production efficiency, currently, the rolling manufacturing process of electrode powder film sheets and the composite rolling process of "electrode powder film sheet - current collector film - electrode powder film sheet" are generally integrated for production, thereby reducing the winding and transfer of electrode powder film sheets and improving efficiency.

[0005] When rolling and producing electrode powder film sheets, it is desired to increase the pressure between the rollers as much as possible so that the powder can be pressed more tightly. On the one hand, it can improve the mechanical strength of the film sheet, and at the same time, it can increase the density of the film sheet, and further, when assembled into a battery, it can improve the energy density of the battery.

[0006] However, in the current double-sided film formation dry electrode production equipment, the roller group for producing electrode powder film sheets is limited by the roller group structure and cannot provide a very large pressure to roll the powder. When the rolling pressure increases, the flat roller surface will be deformed by the force, resulting in inconsistent roller spacing on the width direction of the film sheet, and further resulting in inconsistent film thickness in the width direction of the produced electrode powder film sheet. Eventually, the produced dry electrode sheet will also have the problem of inconsistent film thickness, which is likely to cause problems such as uneven current distribution, unstable battery capacity, and abnormal heating when produced into a battery.

[0007] Therefore, it is necessary to improve the dry electrode production equipment for double-sided film formation. On the one hand, it is expected to reduce the floor area of the equipment. On the other hand, it is expected to apply a greater pressure during the roll pressing production of the electrode powder film, so as to produce a dry electrode sheet with better performance. Summary of the Invention

[0008] The purpose of the present invention is to provide a dry electrode device for double-sided film formation, which improves the coating roll pressing and forming assembly, realizes the efficient, stable and continuous production of the coating sheet, increases the pressure in the final pressing channel, ensures the consistency of the gap in the width direction of the final pressing channel, obtains a coating sheet with better performance, and combines with other equipment for production to obtain a double-sided film formation electrode sheet.

[0009] To achieve the above invention purpose, the present invention provides a dry electrode device for double-sided film formation, which is provided with a frame. Coating roll pressing and forming assemblies are arranged on the left and right sides of the frame. A composite forming assembly is installed on the upper part of the frame, and the composite forming assembly is located between the coating roll pressing and forming assemblies on both sides; a base material unwinding assembly and a finished product winding assembly are also provided;

[0010] The coating roll pressing and forming assembly is provided with a powder forming roll group at the lower part and a coating forming roll group composed of several rolls above;

[0011] The powder forming roll group includes two pressing rolls running inward relatively; above the middle of the two pressing rolls is a powder feeding channel;

[0012] The coating forming roll group is located above the powder forming roll group. A pressing roll is provided at the top of the coating forming roll group, and vertical pressing elements are provided on the upper sides of both ends of the pressing roll;

[0013] Several forming rolls are provided below the pressing roll, including a first forming roll, a second forming roll, and a third forming roll;

[0014] The axes of all the forming rolls are parallel, all the forming rolls are arranged vertically side by side, and a forming roll pressing channel is formed between adjacent two forming rolls;

[0015] A final pressing channel is formed between the first forming roll and the second forming roll; a compaction channel is formed between the second forming roll and the third forming roll;

[0016] Horizontal swing adjustment mechanisms are provided at both ends of the pressing roll. The horizontal swing adjustment mechanisms drive both ends of the pressing roll to move in two directions, so that the pressing roll swings horizontally around the middle position, and the axis of the pressing roll is parallel or horizontally crossed with the axis of the first forming roll.

[0017] As a further improvement of the present invention, horizontal pressing elements are provided on the outer sides of both ends of one of the pressing rollers of the powder forming roller group; the horizontal pressing elements press the first pressing roller in the horizontal direction towards the second pressing roller.

[0018] As a further improvement of the present invention, a horizontal spacing adjusting mechanism is provided between both ends of the two pressing rollers of the powder forming roller group;

[0019] The horizontal spacing adjusting mechanism adjusts the gap between both ends of the two pressing rollers.

[0020] As a further improvement of the present invention, the roller surface of the forming roller located at the bottom of the coating forming roller group is close to the roller surface of one of the pressing rollers of the powder forming roller group, and a primary pressing channel is formed therebetween.

[0021] Furthermore, a thickness adjusting mechanism is provided between both ends of the upper and lower rollers of the roller pressing channel.

[0022] As a further further improvement of the present invention, the horizontal spacing adjusting mechanism within the powder forming roller group, or the thickness adjusting mechanism at both ends of the roller pressing channel is a roller gap adjusting mechanism;

[0023] The roller gap adjusting mechanism is provided with a first inclined block and a second inclined block. The inclined surfaces of the two inclined blocks are in contact with each other, and the outer sides of the two inclined blocks are parallel;

[0024] The outer side of the first inclined block is connected to the roller seat of one of the rollers;

[0025] The outer side of the second inclined block is installed in the slider, and the outer side of the slider is connected to the roller seat of the other roller;

[0026] The second inclined block and the slider are in a sliding connection;

[0027] One end of the second inclined block is provided with a linear drive, and the linear drive drives the second inclined block to slide along its sliding connection direction.

[0028] Furthermore, the linear drive connected to the second inclined block includes a drive shaft. One end of the drive shaft is inserted into the second inclined block, and a threaded drive connection is provided between the drive shaft and the second inclined block;

[0029] The axis of the drive shaft is parallel to the sliding connection direction of the second inclined block;

[0030] The other end of the drive shaft is connected to a drive element; the drive element is a servo motor.

[0031] As a further improvement of the present invention, the vertical pressing elements provided above both ends of the pressing roller are hydraulic cylinders;

[0032] The cylinder block of the hydraulic cylinder of the vertical pressing element is connected to the frame. The piston rod of the hydraulic cylinder of the vertical pressing element is connected with a vertical pressing seat, and both sides of the vertical pressing seat are slidably connected to the frame in the vertical direction;

[0033] A pressing roller seat of the pressing roller is connected below the vertical pressing seat, and the vertical pressing seat and the pressing roller seat are in vertical contact with each other; the vertical pressing seat and the pressing roller seat are horizontally connected by the horizontal swing adjusting mechanism.

[0034] Both the left and right sides of the pressing roller seat are slidably connected to the frame in the vertical direction, and there is a horizontal gap between both the left and right sides of the pressing roller seat and the frame.

[0035] Furthermore, the horizontal swing adjusting mechanism includes a nut adjusting block and a screw;

[0036] The nut adjusting block is connected to the pressing roller seat. An internal thread is provided in the middle of the nut adjusting block, which meshes with the external thread of the screw to form a lead screw-nut transmission mechanism;

[0037] Both ends of the screw are installed at the bottom of the vertical pressing seat through screw seats;

[0038] One end of the screw is connected with a horizontal swing driving element. The horizontal swing driving element is a servo motor and is installed on the vertical pressing seat.

[0039] Furthermore, a limiting plate is fixed to the upper part of the pressing roller seat;

[0040] A displacement monitoring sensor is provided between the pressing roller seat and the vertical pressing seat;

[0041] One part of the displacement monitoring sensor is installed on the limiting plate, and the other part of the displacement monitoring sensor is installed on the lower part of the vertical pressing seat.

[0042] As a further improvement of the present invention, the horizontal crossing angle between the axis of the pressing roller and the axis of the first forming roller is θ;

[0043] 0 < θ ≤ 2°.

[0044] As a further improvement of the present invention, the powder forming roller group of the coating roll pressing forming assembly on both the left and right sides of the frame is located on the outside, and the coating forming roller group is located on the inside;

[0045] The base material unwinding assembly is located above the composite forming assembly, and the finished product winding assembly is located below the composite forming assembly.

[0046] As a further improvement of the present invention, the powder forming roller group of the coating roll pressing forming assembly on both the left and right sides of the frame is located on the outside, and the coating forming roller group is located on the inside;

[0047] The base material unwinding assembly is located below the composite forming assembly, and the finished product winding assembly is located above the composite forming assembly.

[0048] Furthermore, a film thickness detection assembly is provided between the composite forming assembly and the finished product winding assembly.

[0049] A double-sided film-forming dry electrode device of the present invention realizes the efficient, stable and continuous production of coated sheet materials through the structural improvement of the coating roll forming assembly, increases the pressure in the final pressing channel, ensures the consistency of the gap in the width direction of the final pressing channel, and obtains coated sheet materials with better performance; furthermore, by combining the coating roll forming assemblies on both sides and reasonably arranging other components, automated production is achieved, and double-sided film-forming electrode sheets are obtained. Description of the Drawings

[0050] Figure 1 It is an overall structural external view of a double-sided film-forming dry electrode device of the present invention;

[0051] Figure 2 It is a schematic diagram of the internal structure of the whole machine of a double-sided film-forming dry electrode device of the present invention Figure 1 ;

[0052] Figure 3 It is a schematic diagram of the internal structure of the whole machine of a double-sided film-forming dry electrode device of the present invention Figure 2 ;

[0053] Figure 4 It is a schematic diagram of the internal structure of the coating roll forming assembly of the present invention;

[0054] Figure 5 It is a schematic diagram of the overall structure of the powder forming roll group;

[0055] Figure 6 It is a schematic diagram of the overall structure of the coating forming roll group Figure 1 ;

[0056] Figure 7 It is a schematic diagram of the overall structure of the coating forming roll group Figure 2 ;

[0057] Figure 8 It is a schematic diagram of the material flow and forming of the coating roll forming assembly of the present invention;

[0058] Figure 9 It is a schematic diagram of the overall structure of the horizontal spacing adjustment mechanism of the powder forming roll group;

[0059] Figure 10 It is a front view of the overall structure of the horizontal spacing adjustment mechanism of the powder forming roll group;

[0060] Figure 11Schematic diagram of the overall structure of the thickness adjustment mechanism of the coating forming roll set;

[0061] Figure 12 Front view of the overall structure of the thickness adjustment mechanism of the coating forming roll set;

[0062] Figure 13 Schematic diagram of the overall structure of the end part of the pressure roller of the coating forming roll set;

[0063] Figure 14 Schematic diagram of the overall installation of the pressure roller;

[0064] Figure 15 Schematic diagram of the overall structure of the horizontal swing adjustment mechanism of the pressure roller;

[0065] Figure 16 Schematic diagram of the installation of the end structure of the pressure roller of the coating forming roll set;

[0066] Figure 17 Schematic diagram for comparing the gap adjustment of the final pressing channel of the coating forming roll set;

[0067] Figure 18 Schematic diagram of the horizontal yaw of the pressure roller;

[0068] Figure 19 Layout method with the finished product winding assembly and the film thickness detection assembly located below;

[0069] Figure 20 Layout method with the finished product winding assembly and the film thickness detection assembly located above. Detailed implementation manners

[0070] The following further elaborates on the detailed implementation manners of the present invention in conjunction with the accompanying drawings.

[0071] A double-sided film-forming dry electrode device of the present invention has an overall structure as Figures 1 to 3 shown, provided with a frame 1, coating roll pressing and forming assemblies 2 are arranged on the left and right sides of the frame 1, a base material unwinding assembly 3 is preferably arranged on the upper part of the frame 1, a composite forming assembly 4 is arranged in the middle, and a finished product winding assembly 5 is arranged in the middle of the lower part.

[0072] One improvement of the double-sided film-forming dry electrode device of the present invention, that is, the structural improvement of the coating roll pressing and forming assembly 2, is shown in Figure 4 , a pair of horizontally arranged roll sets are arranged at the lower part, which are powder forming roll sets 21, and several vertically arranged roll sets are arranged above, which are coating forming roll sets 22.

[0073] Among them, the powder forming roll set 21, as Figure 5As shown, it includes two relatively inward-running pressure rollers, namely the first pressure roller 211 and the second pressure roller 213. Above the middle of the two pressure rollers, there is a powder feeding channel for the powder mixture to be formed into a coating, which enters between the two rollers from above the middle of the two rollers.

[0074] Further preferably, horizontal pressing elements 212, preferably hydraulic cylinders, are provided on the outer sides of both ends of the first pressure roller 211, which can press the first pressure roller 211 in the horizontal direction towards the second pressure roller 213, thereby applying pressure between the two pressure rollers to press the powder mixture into a sheet.

[0075] Further preferably, a horizontal spacing adjusting mechanism 214 is provided at both ends of the second pressure roller 213, which can adjust the horizontal distance between the second pressure roller 213 and the first pressure roller 211, thereby adjusting the gap size between the second pressure roller 213 and the first pressure roller 211 and the gap consistency in the width direction, and further adjusting the thickness of the sheet extruded by the two pressure rollers and the thickness consistency in the width direction.

[0076] The coating forming roller set 22, as Figure 6 、 Figure 7 shown, has a pressing roller 221 at the top. Vertical pressing elements 222, preferably hydraulic cylinders, are provided on the upper sides of both ends of the pressing roller 221, which can press the pressing roller 221 downward in the vertical direction. Below the pressing roller 221, there are several forming rollers, namely the first forming roller 225, the second forming roller 226, the third forming roller 227, and even more; the axes of all the forming rollers are parallel and vertically arranged. Between adjacent two forming rollers, a forming roller pressing channel is formed. In this embodiment, that is, a final pressing channel is formed between the first forming roller 225 and the second forming roller 226, and a compaction channel is formed between the second forming roller 226 and the third forming roller 227; of course, the third forming roller 227 can also be close to the second pressure roller 213, and an initial pressing channel is formed between the two. The pressing roller 221 and each forming roller in the coating forming roller set 22 have a vertical roller pressing freedom degree. A thickness adjusting mechanism 228 is provided between the two ends of the upper and lower rollers in the roller pressing channel. Through the thickness adjusting mechanism 228, the gap between the two ends of the upper and lower rollers is mechanically adjusted, so as to obtain a roller-pressed formed sheet with a corresponding thickness.

[0077] The important improvement of the present invention is that the two ends of the pressure roller 221 are provided with a horizontal swing adjustment mechanism 223, which can adjust the horizontal swing angle of the pressure roller 221 so that the axis of the pressure roller 221 and the axis of the first forming roller 225 form an "X" shape at a certain angle; the middle roller surfaces of the two rollers are preferentially fitted, thereby offsetting the deformation of the middle of the rollers. In this case, according to the pressure applied by the pressure element 222, the axis staggered angle between the pressure roller 221 and the first forming roller 225 is adjusted to adjust the deformation compensation amount of the middle roller surface. , so that the roller surface gap between the first forming roller 225 and the second forming roller 226 forming the final pressure channel is uniform, thereby making the width and thickness of the coated sheet finally output uniform and consistent; under the condition that the width and thickness of the coated sheet can be ensured to be uniform and consistent, the output pressure of the pressure element 222 can make the pressure transmitted to the first forming roller 225 by the pressure roller 221 greater, and thus the pressure in the final pressure channel between the first forming roller 225 and the second forming roller 226 is also greater, which can make the density of the coated sheet after pressing higher.

[0078] like Figure 8 As shown, when the coating roller-forming assembly 2 of the present invention is in operation, the powder raw material enters between the first pressing roller 211 and the second pressing roller 213, is initially extruded and formed into a primary pressed sheet A2, then passes through the compaction channel between the second forming roller 226 and the third forming roller 227 to form an intermediate sheet A1, and finally passes through the final pressing channel between the first forming roller 225 and the second forming roller 226 to form a coated sheet A, which is output outward; Figure 8 In the example, the third forming roller 227 is spaced apart from the second pressing roller 213, and no initial pressing channel is formed. This means that the powdered material is initially pressed into a sheet by the powder forming roller assembly 21. This is then pressed two or three times by the coating forming roller assembly 22, ultimately forming a coated sheet A that meets the requirements. The thickness of A2 is greater than the thickness of A1, and greater than the thickness of A.

[0079] It is necessary to ensure that the rollers on both sides of each rolling channel are parallel and move synchronously to avoid inconsistent forces on the upper and lower parts of the sheet, which may tear or break the incompletely solidified powder sheet.

[0080] Each roller in the coating roller forming assembly 2 of the present invention is preferably a heating roller, and the temperature can be set according to the temperature requirements of the powder raw material compaction and compaction molding, so that not only pressure is applied during the rolling process, but also a suitable temperature is applied to accelerate the molding of the coating sheet A.

[0081] The gap adjustment mechanism between the two rollers, the horizontal spacing adjustment mechanism 214, the thickness adjustment mechanism 228, as Figures 9 - 12As shown, they are all roll gap adjusting mechanisms 23, which are provided with a first inclined block 231 and a second inclined block 232. The inclined surfaces of the two inclined blocks are in contact with each other, and the two outer sides are parallel. The difference is that the outer side of the first inclined block 231 is directly connected to the roll seat or through a parallel spacer block, while the outer side of the second inclined block 232 is installed in the slider 233, and the outer side of the slider 233 is directly connected to another roll seat or through a parallel spacer block; the second inclined block 232 and the slider 233 are in a sliding connection. In this embodiment, the two sides of the second inclined block 232 are provided with chutes 2322, and the inner side of the slider 233 is provided with protrusions 2332. The protrusions 2332 on both sides are snapped into the chutes 2322 on both sides, and the sliding direction is parallel to the outer side of the inclined block (especially the first inclined block 231); the slope of the inclined surfaces of the two inclined blocks can generally reach more than 15:1, which is a labor-saving mechanism. Applying a force ① along the sliding connection direction to the second inclined block 232, the inclined surface of the second inclined block 232 cooperates with the inclined surface of the first inclined block 231 to generate a force ② in the inclined surface direction, and further generates a force ③ on the first inclined block 231 that makes the distance between the outer sides of the two inclined blocks larger.

[0082] One end of the second inclined block 232 is provided with a linear drive to drive the second inclined block 232 to actively slide along the sliding connection direction, thereby changing the distance between the outer sides of the two inclined blocks, that is, changing the gap between the two rolls; in this embodiment, the linear drive includes a drive shaft 234. One end of the drive shaft 234 is in threaded transmission connection inside the second inclined block 232, and the axis of the drive shaft 234 is parallel to the sliding connection direction of the second inclined block 232; the drive shaft 234 applies a driving force along the sliding connection direction to the second inclined block 232. The other end of the drive shaft 234 is connected to the drive element 236; preferably, a support seat 235 is provided in the middle of the drive shaft 234. According to the installation position limitation of the drive element 236, such as the horizontal spacing adjustment mechanism 214 in this embodiment, a transmission mechanism 237 may also be provided between the drive element 236 and the drive shaft 234. In this embodiment, it is a synchronous belt transmission mechanism, so that the drive element 236 can be installed on the outside, and the driving force is transmitted to the drive shaft 234 in a narrow space through the transmission mechanism 237; while for the thickness adjustment mechanism 228 in this embodiment, the output shaft of the drive element 236 is directly connected to the drive shaft 234.

[0083] The drive element 236 is preferably a servo motor. Since the slope of the inclined surfaces of the two inclined blocks is determined, the pitch of the threaded connection (without backlash / clearance) between the drive shaft 234 and the second inclined block 232 is determined, and the reduction ratio of the drive element 236 is determined, then the distance between the outer sides of the roll gap adjusting mechanism 23 can be accurately controlled by controlling the number of rotation circles / angles of the servo motor of the drive element 236, and then the distance between the two roll seats connected thereto can be controlled, and finally the gap between the rolls can be accurately controlled.

[0084] The vertical pressing element 222 connected to the pressing roller 221 of the present invention, in particular the connected horizontal swing adjustment mechanism 223, is specifically as follows Figures 12 - 16 shown.

[0085] The cylinder block of the hydraulic cylinder of the vertical pressing element 222 is connected to the frame 1 (as shown in the figure, preferably hinged), the piston rod of the hydraulic cylinder of the vertical pressing element 222 is connected with a vertical pressing seat 2222, and both sides of the vertical pressing seat 2222 form a vertical sliding connection with the frame 1.

[0086] A pressing roller seat 2212 of the pressing roller 221 is connected below the vertical pressing seat 2222. The vertical pressing seat 2222 is in vertical contact with the pressing roller seat 2212, but is horizontally connected through the horizontal swing adjustment mechanism 223. Both the left and right sides of the pressing roller seat 2212 also form a vertical sliding connection with the frame 1, but there is a horizontal gap 2216 between both the left and right sides of the pressing roller seat 2212 and the frame 1, so that the pressing roller seat 2212 can drive the pressing roller 221 to perform horizontal position adjustment.

[0087] The horizontal swing adjustment mechanism 223 is specifically as follows Figure 15 、 Figure 16 shown, and includes a nut adjustment block 2232 and a screw rod 2233. The nut adjustment block 2232 is connected to the pressing roller seat 2212. An internal thread is provided in the middle of the nut adjustment block 2232, which meshes with the external thread of the screw rod 2233 to form a lead screw-nut transmission mechanism; both ends of the screw rod 2233 are installed at the bottom of the vertical pressing seat 2222 through screw rod seats 2234; one end of the screw rod 2233 is connected with a horizontal swing driving element 2235. In this embodiment, the horizontal swing driving element 2235 is a servo motor and is installed on the vertical pressing seat 2222; limited by the installation space position, the output shaft of the horizontal swing driving element 2235 and the driving end of the screw rod 2233 are connected through a transmission mechanism 2236. In this embodiment, the transmission mechanism 2236 here is a steering transmission mechanism composed of a pair of bevel gears. When the servo motor of the horizontal swing driving element 2235 works, it drives the screw rod 2233 to rotate through the transmission mechanism 2236, and then makes the nut adjustment block 2232 perform horizontal movement along the screw rod 2233, and finally drives the pressing roller seat 2212 to perform horizontal position adjustment relative to the vertical pressing seat 2222.

[0088] Further, a limiting plate 2213 is fixedly arranged on the upper part of the pressing roller seat 2212. The limiting plate 2213 bulges inwards to form a limiting convex block 2214. A limiting groove 2224 is horizontally formed in the lower part of the vertical pressing seat 2222. The limiting convex block 2214 is clamped into the limiting groove 2224, and the horizontal length dimension of the limiting convex block 2214 is shorter than that of the limiting groove 2224. When the horizontal swing adjusting mechanism 223 works, the pressing roller seat 2212 can drive the limiting convex block 2214 of the limiting plate 2213 to slide left and right in the horizontal direction in the limiting groove 2224. By arranging the limiting plate 2213, vertical limiting between the pressing roller seat 2212 and the vertical pressing seat 2222 and force transmission can be further formed.

[0089] A displacement monitoring sensor 2238 is further arranged between the pressing roller seat 2212 and the vertical pressing seat 2222. Preferably, a part of the displacement monitoring sensor 2238 is arranged on the limiting plate 2213, and a part of the displacement monitoring sensor 2238 is arranged on the lower part of the vertical pressing seat 2222, which is convenient for detecting the horizontal displacement of the pressing roller seat 2212 relative to the vertical pressing seat 2222.

[0090] In the present invention, by arranging the pressing roller 221 that can swing horizontally, pressure is applied to the first forming roller 225, so as to adjust the width and thickness consistency of the final pressing channel formed between the first forming roller 225 and the second forming roller 226, and simultaneously increase the pressure in the final pressing channel. The working principle of this mechanism is as follows:

[0091] 1. As shown in figure (a) in Figure 17 , both the first forming roller 225 and the second forming roller 226 are round and straight pressing rollers. The gap between the two ends of the two rollers is adjusted through the thickness adjusting mechanism 228 at both ends to make the gap consistent. In an ideal state, the final pressing channel formed between the first forming roller 225 and the second forming roller 226 will form a channel with a consistent gap everywhere along the width direction. Pressure Fa is applied to both ends of the first forming roller 225, so that a coated sheet A with uniform and consistent thickness in the width direction can be obtained.

[0092] 2. As in Figure 17As shown in Figure (b), in actual conditions, when the coating sheet A is rolled, the coating sheet A will also generate pressure on the roller surfaces on both sides of the channel; when the pressure roller is long and the applied pressure Fb is large, the middle position of the pressure roller will bend and deform, that is, as shown in the figure, the middle of the first forming roller 225 is bent and deformed upward, and the middle of the second forming roller 226 is bent and deformed downward (not considering the situation where a third forming roller 227 is provided below the second forming roller 226); at this time, after the pressure Fb is applied to both ends of the first forming roller 225, the final pressure channel will form a channel with a thick middle and thin ends along the width direction, so that the thickness of the coating sheet A in the width direction after the final pressing is not uniform, generally thick in the middle and thin at both ends; the thickness of the coating sheet A at both ends is basically adjusted and controlled by the thickness adjustment mechanism 228, but the thickness in the middle is affected by the rigidity of the pressure roller and the size of the pressure Fb applied at both ends, and there is a lot of uncertainty.

[0093] 3. If Figure 17 As shown in FIG. (c), the solution provided by the present invention is that a pressure roller 221 capable of swinging in the horizontal direction is provided on the first forming roller 225. Figure 18 As shown, the ends of the pressure roller 221 are driven by a horizontal swing adjustment mechanism 223, moving in two directions so that the horizontal projections of the axis of the pressure roller 221 and the axis of the first forming roller 225 intersect at an angle θ. At this point, the upper intermediate roller surface of the first forming roller 225 contacts the intermediate roller surface of the pressure roller 221 before the intermediate roller surface of the pressure roller 221. When a pressure Fc is applied to the ends of the pressure roller 221, the lower intermediate roller surface of the pressure roller 221 first contacts the upper intermediate roller surface of the first forming roller 225, applying a downward force to it, pre-deflecting it downward. This offsets the roller bending deformation caused by rolling the coated sheet A. By adjusting the relationship between Fc and angle θ, a coated sheet A with a thickness that is as uniform and consistent as possible across its width can be achieved. Once the uniformity of the coated sheet A's thickness across its width is ensured, the pressure Fc applied by the pressure roller 221 at both ends can be increased to compress and compact the coated sheet A as much as possible, thereby increasing its structural strength and density.

[0094] In actual production, when the length of the pressure roller 221 is 1 meter, the unilateral deflection distance is about 12 mm; when the length of the pressure roller 221 is 2 meters, the unilateral deflection distance is about 20 mm; when the length of the pressure roller 221 is 3 meters, the unilateral deflection distance is about 30 mm; therefore, the horizontal deflection angle θ of the pressure roller 221 is generally about 1°, and the maximum is about 2°. Figure 17 、 Figure 18The θ angle is enlarged in the figure to illustrate the supplementary principle. During the actual production process, the pressing roller 221 will gradually contact the entire first forming roller 225 from the middle to both ends, and then transfer the pressure applied to both ends of the pressing roller 221 by the vertical pressing element 222 to the first forming roller 225 through the contact on the roller surface.

[0095] Another improvement of the double-sided film-forming dry electrode device of the present invention is that two coating roller pressing and forming assemblies 2 are used, combined with a base material unwinding assembly 3, a composite forming assembly 4, and a finished product winding assembly 5 to form a dry production device that can efficiently and automatically produce double-sided film-forming electrodes.

[0096] As Figures 1 to 3 shown, a set of coating roller pressing and forming assemblies 2 are respectively arranged on the left and right sides. The two sets of coating roller pressing and forming assemblies 2 are preferably symmetrically arranged. The powder forming roller set 21 is located on the outside for convenient feeding, and the coating forming roller set 22 is located on the inside, and the final finished coating sheet A is conveyed relatively inward; a composite forming assembly 4 is arranged in the middle of the two sets of coating roller pressing and forming assemblies 2. The composite forming assembly 4 is preferably arranged above to be as close as possible to the discharge channel of the coating roller pressing and forming assembly 2, reducing the transmission distance of the finished coating sheet A, so as to maintain and make full use of the temperature of the finished coating sheet A.

[0097] As Figures 1 to 3 shown, further referring to Figure 19 , the base material unwinding assembly 3 is located above the composite forming assembly 4, and the finished product winding assembly 5 is located below the composite forming assembly 4; the base material unwinding assembly 3 outputs the base material B to the composite forming assembly 4. Above the composite forming assembly 4, the coating sheets A on both sides converge with the base material B to form a composite structure of A-B-A, which is roll-pressed by the composite forming assembly 4 into a finished double-sided film-forming electrode sheet C, and finally wound by the finished product winding assembly 5.

[0098] As Figure 19 shown, a film thickness detection assembly 6 is also arranged between the composite forming assembly 4 and the finished product winding assembly 5. The film thickness detection assembly 6 is generally a professional detection device using a marble platform and requires a certain amount of equipment space; when the finished product winding assembly 5 is located below the equipment frame 1, that is, it needs to be located between the two sets of coating roller pressing and forming assemblies 2 on both sides, and then the frame 1 needs to be lengthened so that the space between the two sets of coating roller pressing and forming assemblies 2 on both sides is large enough to accommodate the film thickness detection assembly 6 and the finished product winding assembly 5.

[0099] Of course, it can also be as Figure 20As shown, the positions of the base material unwinding assembly 3 and the finished product winding assembly 5 are swapped, so that the base material unwinding assembly 3 is located in the middle below the frame 1, and the base material B is conveyed upward. After converging with the coating sheets A on both sides, it enters the composite forming assembly 4 from below and is roll-compounded into the finished double-sided film electrode sheet C. The finished product is wound by the finished product winding assembly 5 located at the top of the frame 1. At this time, the platform space above the frame 1 can be fully utilized, and the film thickness detection assembly 6 can be arranged in front of the finished product winding assembly 5 without additionally increasing the length of the frame 1.

[0100] The preferred embodiments of the present invention have been specifically described above, but the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A double-sided film-forming dry electrode device, characterized in that, A frame is provided, and coating roll forming assemblies are arranged on the left and right sides of the frame. A composite forming assembly is installed on the upper part of the frame, and the composite forming assembly is located between the coating roll forming assemblies on both sides. A base material unwinding assembly and a finished product winding assembly are also provided. For the coating roll forming assembly, a powder forming roll group is arranged at the lower part, and a coating forming roll group composed of several rolls is arranged above. The powder forming roll group includes two pressure rolls running relatively inward. Above the middle of the two pressure rolls is a powder feeding channel. The coating forming roll group is located above the powder forming roll group. A pressing roll is arranged at the top of the coating forming roll group, and vertical pressing elements are arranged on the upper sides at both ends of the pressing roll. Several forming rolls are arranged below the pressing roll, including a first forming roll, a second forming roll, and a third forming roll. The axes of all the forming rolls are parallel, and all the forming rolls are vertically arranged side by side. Between adjacent two forming rolls, a forming roll pressing channel is formed. A final pressing channel is formed between the first forming roll and the second forming roll; a compaction channel is formed between the second forming roll and the third forming roll. Horizontal swing adjusting mechanisms are arranged at both ends of the pressing roll. The horizontal swing adjusting mechanisms drive both ends of the pressing roll to move in two directions, so that the pressing roll swings horizontally around the middle position, and the axis of the pressing roll is parallel or horizontally crossed with the axis of the first forming roll.

2. The double-sided film-forming dry electrode device according to claim 1, wherein Horizontal pressing elements are arranged on the outer sides at both ends of one of the pressure rolls in the powder forming roll group; the horizontal pressing elements press the first pressure roll horizontally towards the second pressure roll.

3. The double-sided film-forming dry electrode device according to claim 1, wherein A horizontal spacing adjusting mechanism is arranged between both ends of the two pressure rolls in the powder forming roll group. The horizontal spacing adjusting mechanism adjusts the gap between both ends of the two pressure rolls.

4. A double-sided film-forming dry electrode device according to claim 1, characterized in that, The roll surface of the forming roll at the lowest position in the coating forming roll group is close to the roll surface of one of the pressure rolls in the powder forming roll group, and an initial pressing channel is formed between them.

5. The double-sided film-forming dry electrode device according to claim 4, wherein A thickness adjusting mechanism is arranged between both ends of the upper and lower two rolls in the roll pressing channel.

6. The double-sided film-forming dry electrode device according to claim 3 or 5, characterized in that, The horizontal spacing adjusting mechanism in the powder forming roll group or the thickness adjusting mechanism at both ends of the roll pressing channel is a roll gap adjusting mechanism. The roll gap adjusting mechanism is provided with a first inclined block and a second inclined block. The inclined surfaces of the two inclined blocks are in contact with each other, and the outer sides of the two inclined blocks are parallel. The outer side of the first inclined block is connected to the roll seat of one of the rolls. The outer side of the second inclined block is installed in the slider, and the outer side of the slider is connected to the roll seat of the other roll. A sliding connection is provided between the second inclined block and the slider. A linear drive is arranged at one end of the second inclined block, and the linear drive drives the second inclined block to slide along its sliding connection direction.

7. The double-sided film-forming dry electrode device according to claim 6, wherein, The linear drive connected to the second inclined block includes a drive shaft. One end of the drive shaft is inserted into the second inclined block, and a threaded transmission connection is provided between the drive shaft and the second inclined block. The axis of the drive shaft is parallel to the sliding connection direction of the second inclined block. The other end of the drive shaft is connected to a drive element; the drive element is a servo motor.

8. The double-sided film-forming dry electrode device according to claim 1, characterized in that, The vertical pressing elements arranged above both ends of the pressing roll are hydraulic cylinders. The cylinder body of the hydraulic cylinder of the vertical pressing element is connected to the frame, and the piston rod of the hydraulic cylinder of the vertical pressing element is connected with a vertical pressing seat. Both sides of the vertical pressing seat are slidably connected to the frame in the vertical direction. The pressure application roller seat of the pressure application roller is connected below the vertical pressure application seat, and they are in vertical contact with each other; they are horizontally connected by the horizontal swing adjustment mechanism between the vertical pressure application seat and the pressure application roller seat. The left and right sides of the pressure application roller seat are slidably connected to the machine frame in the vertical direction, and there is a horizontal gap between the left and right sides of the pressure application roller seat and the machine frame.

9. The double-sided film-forming dry electrode device according to claim 8, wherein, The horizontal swing adjustment mechanism includes a nut adjustment block and a screw. The nut adjustment block is connected to the pressure application roller seat. The middle of the nut adjustment block is provided with an internal thread, which meshes with the external thread of the screw to form a lead screw-nut transmission mechanism. Both ends of the screw are installed at the bottom of the vertical pressure application seat through screw seats. One end of the screw is connected with a horizontal swing driving element, and the horizontal swing driving element is a servo motor, which is installed on the vertical pressure application seat.

10. A double-sided film-forming dry electrode device according to claim 8, characterized in that, A limiting plate is fixed on the upper part of the pressure application roller seat. A displacement monitoring sensor is arranged between the pressure application roller seat and the vertical pressure application seat. One part of the displacement monitoring sensor is installed on the limiting plate, and the other part of the displacement monitoring sensor is installed on the lower part of the vertical pressure application seat.

11. The double-sided film-forming dry electrode device according to claim 1, wherein, The horizontal crossing angle between the axis of the pressure application roller and the axis of the first forming roller is θ. 0 < θ ≤ 2°.

12. The double-sided film-forming dry electrode device according to claim 1, characterized in that, The powder forming roller group of the coating roller pressing and forming assembly on the left and right sides of the machine frame is located on the outside, and the coating forming roller group is located on the inside. The base material unwinding assembly is located above the composite forming assembly, and the finished product winding assembly is located below the composite forming assembly.

13. A double-sided film-forming dry electrode device according to claim 1, characterized in that, The powder forming roller group of the coating roller pressing and forming assembly on the left and right sides of the machine frame is located on the outside, and the coating forming roller group is located on the inside. The base material unwinding assembly is located below the composite forming assembly, and the finished product winding assembly is located above the composite forming assembly.

14. A double-sided film-forming dry electrode device according to claim 12 or 13, characterized in that, A film thickness detection assembly is arranged between the composite forming assembly and the finished product winding assembly.

Images