Multi-roller rolling device for dry-method electrode

Abstract

The utility model relates to the technical field of rolling equipment, in particular to a multi-roller rolling device for a dry electrode, which comprises a base and a rack, and further comprises a rolling structure, a roller spacing adjusting structure, a detection structure, an edge cutting structure and a winding structure which are arranged on the rack, the rolling structure comprises a first pressing roller, a second pressing roller and a third pressing roller which are sequentially arranged, and the heights of the pressing rollers are sequentially reduced so that the pressing rollers can be obliquely arranged. The third pressing roller is provided with a supporting assembly, and the supporting assembly comprises a plurality of traction rollers rotating on the rack and a supporting belt; the roller spacing adjusting structure comprises a first adjusting assembly used for driving the first pressing roller and a second adjusting assembly used for driving the third pressing roller. The detection structure comprises a thickness detector facing the supporting belt. The inclined compression roller enables the powder material to be subjected to component force in the inclination direction of the roller surface, so that the motion trail of dry powder is changed to prevent the dry powder from vertically falling off, the roller spacing adjusting structure drives the compression roller according to the electrode thickness to adjust the roller spacing, and the consistency and the yield of products are improved.

Description

Technical Field

[0001] This application relates to the field of roller pressing equipment technology, and in particular to a multi-roller roller pressing device for dry electrode. Background Technology

[0002] In the production of power battery electrodes, dry-process electrodes have attracted significant industry attention due to their solvent-free operation and high energy density. Ensuring the quality of the self-supporting membrane and the stability of the production environment are crucial in the manufacturing of dry-process electrodes. When conventional dry-process electrode rolling equipment rolls dry electrode powder materials, the horizontally mounted rollers cause dry powder to easily fall off during the extrusion process due to gravity. This scattered dry powder not only pollutes the production environment and harms personnel health, but also wastes materials and increases production costs. Furthermore, the falling powder can easily fall into critical parts of the equipment, reducing its lifespan and even causing malfunctions, affecting production efficiency and increasing maintenance costs.

[0003] Furthermore, during production, the thickness of dry electrode materials can fluctuate due to factors such as raw material characteristics. Conventional dry electrode rolling equipment typically relies on manual experience to roughly set the roller spacing before production. During production, the roller spacing cannot be flexibly adjusted according to changes in material thickness. This results in the inability to promptly correct deviations in material thickness, leading to uneven product thickness. This severely impacts product consistency and yield, potentially causing battery performance instability in subsequent applications. Utility Model Content

[0004] The purpose of this application is to provide a multi-roller pressing device for dry electrodes, which aims to improve the problems of easy dry powder falling off and difficulty in adjusting the gap between the pressing rollers in the related technology of dry electrode pressing equipment, and improve the processing quality and processing efficiency of dry electrode pressing equipment.

[0005] This application provides a multi-roller pressing device for dry electrodes, including a base with a frame, and further including a pressing structure, a gap adjustment structure, a detection structure, a trimming structure, and a winding structure disposed on the frame. The pressing structure includes a first pressure roller, a second pressure roller, and a third pressure roller arranged sequentially, the first pressure roller and the third pressure roller being slidably connected to the frame, and the heights of the first pressure roller, the second pressure roller, and the third pressure roller decreasing sequentially to be arranged at an angle. The third pressure roller is provided with a support assembly, the support assembly including a plurality of traction rollers rotating on the frame and a support belt, the support belt covering the traction rollers and the third pressure roller. The gap adjustment structure includes a first adjustment component for driving the first pressure roller and a second adjustment component for the third pressure roller. The detection structure includes a thickness gauge disposed on the frame, the thickness gauge facing the support belt.

[0006] Furthermore, the axes of the first pressure roller, the second pressure roller, and the third pressure roller are coplanar, and the plane containing the axes has an angle θ with the horizontal plane, with the angle θ ranging from 5 to 50°.

[0007] Furthermore, the first adjustment component includes a first mounting plate, a first support plate, and a first connecting frame disposed on both sides of the first pressure roller; the first mounting plate is provided with a first driving member, which passes through the first support plate and is connected to the first connecting frame.

[0008] Furthermore, the first driving component includes a servo motor disposed on the first mounting plate, and the output shaft of the servo motor is provided with a lead screw, which passes through the first support plate and is connected to the first connecting frame.

[0009] Furthermore, the structure of the second adjustment component is the same as that of the first adjustment component; the first adjustment component is disposed on the side of the first pressure roller away from the second pressure roller, and the second adjustment component is disposed on the side of the third pressure roller away from the second pressure roller.

[0010] Furthermore, a first slider is provided on both sides of the first pressure roller, and a second slider is provided on both sides of the second pressure roller; the frame is provided with a groove corresponding to the first slider and the second slider, and the first slider and the second slider are slidably connected to the groove.

[0011] Furthermore, a first guide limiting strip is provided on one side of the first slider, and a second guide limiting strip is provided on one side of the second slider; the frame is provided with a corresponding guide limiting groove, which is located on one side of the slide groove, and the first guide limiting strip, the second guide limiting strip and the guide limiting groove are slidably connected.

[0012] Furthermore, the cutting structure includes a cutting support seat disposed on the frame and a cutting tool disposed on the cutting support seat, the cutting tool facing the support belt.

[0013] The beneficial effects of this application are:

[0014] 1. This application discloses a multi-roller pressing device for dry electrodes. By setting a first, second, and third roller with sequentially decreasing heights, powder material is fed into these rollers for roll forming. The inclined rollers subject the powder material to a component force along the inclined direction of the roller surface, thereby altering the trajectory of the dry powder and preventing it from falling vertically. Simultaneously, the material adheres more easily to the roller surface under gravity, reducing dry powder generated by gaps and vibrations. The support assembly on the third roller, using a support belt, further ensures the mixing and rolling of the powder material and prevents powder material from falling into the equipment, thus reducing material loss due to flying dry powder and improving production efficiency and economic benefits. A thickness detection instrument can monitor the dry electrode thickness in real time, and the roller gap adjustment structure drives the first and third rollers according to the dry electrode thickness data to adjust the roller gap, improving product consistency and yield.

[0015] 2. A multi-roller pressing device for dry electrodes according to this application, wherein the thickness detection structure works in concert with the thickness detector and the roller gap adjustment structure. During the pressing process, the thickness detector accurately acquires the thickness data of the dry electrode material and feeds it back to the roller gap adjustment structure. The roller gap adjustment structure drives the corresponding drive component to rotate the lead screw, thereby controlling the movement of the connecting frame and accurately adjusting the position of the first or third pressure roller to ensure that the material thickness meets the production standard and realizes real-time dynamic adjustment of the pressure roller gap.

[0016] 3. A multi-roller pressing device for dry electrodes according to this application, by setting a chute and a guide limiting groove on the frame, and setting corresponding sliders and guide limiting strips on both sides of the first and second pressing rollers, when the driving component drives the corresponding pressing roller to move, the corresponding slider will move along the chute and the corresponding guide limiting strip will move along the guide limiting groove, so that the pressing roller can move accurately, further improving the thickness adjustment accuracy of the multi-roller pressing device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a multi-roller pressing device for dry electrodes provided in an embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the cooperation structure between each structure and the frame in the embodiments of this application;

[0019] Figure 3 This is a schematic diagram of the roll forming structure according to an embodiment of this application;

[0020] Figure 4 This is a schematic diagram of the frame, roller pressing structure, and roller gap adjustment structure in the embodiments of this application;

[0021] Figure 5 This is a schematic diagram of the roller pressing structure and the roller gap adjustment structure in the embodiments of this application;

[0022] Figure 6 yes Figure 5 A magnified view of part A in the diagram.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Base; 11. Frame; 111. Slide groove; 12. Feed limit frame; 13. Central control; 2. Roller pressing structure; 21. First pressure roller; 211. First slider; 212. First guide limit strip; 22. Second pressure roller; 221. Fixing block; 23. Third pressure roller; 24. Support assembly; 241. Traction roller; 242. Support belt; 3. Roller gap adjustment structure; 31. First adjustment assembly; 311. First mounting plate; 312. First support plate; 313. First connecting frame; 314. First driving component; 32. Second adjustment assembly; 4. Detection structure; 5. Edge cutting structure; 51. Cutting support seat; 52. Cutting tool; 6. Rewinding structure; 61. Rewinding roller. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0026] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0028] Reference Figure 1 as well as Figure 2 This application provides a multi-roller pressing device for dry electrodes, including a base 1, a frame 11, and a pressing structure 2, a roller gap adjustment structure 3, a detection structure 4, a trimming structure 5, and a winding structure 6 disposed on the frame 11. After the powder material enters, it will pass through the pressing structure 2, the detection structure 4, the trimming structure 5, and the collection structure in sequence. The structure detection measures the thickness of the dry electrode and feeds it back to the roller gap adjustment structure 3. The roller gap adjustment structure 3 adjusts the roller gap of the pressing structure 2 according to the thickness of the dry electrode.

[0029] Specifically, the frame 11 is fixedly installed on the upper end of the base 1, and the frame 11 is used to support and install various structures. The frame 11 is equipped with a feed limit frame 12 and a central control unit 13. The feed limit frame 12 faces the roller pressing structure 2. The material will be fed into the roller pressing structure 2 from the feed limit frame 12. The central control unit 13 is used to receive, calculate and transmit various types of data. The central control unit 13 is electrically connected to the roller pressing structure 2, the roller gap adjustment structure 3, the detection structure 4, the edge trimming structure 5 and the winding structure 6.

[0030] Reference Figure 1 , Figure 2 as well as Figure 3 The roll forming structure 2 includes a first roll 21, a second roll 22, and a third roll 23 arranged sequentially. Fixed blocks 221 are provided on both sides of the second roll 22. The fixed blocks 221 are mounted on the frame 11 and equipped with a motor for driving the second roll 22 to rotate. The first roll 21 and the third roll 23 are slidably connected to the frame 11 to achieve roll spacing adjustment. To reduce powder material drop, the heights of the first roll 21, the second roll 22, and the third roll 23 are sequentially reduced to form an inclined arrangement. In this embodiment, the axes of the first roll 21, the second roll 22, and the third roll 23 are coplanar, and the plane containing the axes forms an angle θ with the horizontal plane, with the angle θ ranging from 5 to 50°. Simultaneously, the first roll 21 and the third roll 23 rotate clockwise, while the second roll 22 rotates counterclockwise, resulting in symmetrical rolling force on the powder material, preventing material displacement, and improving rolling uniformity.

[0031] In addition, the third pressure roller 23 is provided with a support assembly 24, which includes a plurality of traction rollers 241 rotating on the frame 11 and a support belt 242. The support belt 242 covers the traction rollers 241 and the third pressure roller 23. The support belt 242 is located between the frames 11, and the multiple traction rollers 241 drive the support belt 242 to rotate. The support belt is arranged in a ring, and its upper end face is located at the lower end of the second pressure roller 22 for stable transmission of the calendered dry electrode.

[0032] By arranging the three pressure rollers in this way, after the electrode material enters, the first pressure roller 21 rotates clockwise to convey it downwards, the second pressure roller 22 rotates counterclockwise to provide reverse pressure, and the third pressure roller 23 compacts it again to ensure a dense material structure. The three rollers are arranged at an incline, and the powder material naturally adheres to the roller surface under the action of gravity, thereby reducing wrinkles. During the extrusion process, the powder material is subjected to a component force along the incline direction. This component force changes the trajectory of the dry powder, making it less likely to fall vertically, thereby reducing powder drop and scattering.

[0033] Reference Figure 4 as well as Figure 5The roller gap adjustment structure 3 includes a first adjustment component 31 for driving the first pressure roller 21 and a second adjustment component 32 for driving the third pressure roller 23. The first adjustment component 31 is located on the side of the first pressure roller 21 away from the second pressure roller 22, and the second adjustment component 32 is located on the side of the third pressure roller 23 away from the second pressure roller 22. The structure of the second adjustment component 32 is the same as that of the first adjustment component 31. Taking the first adjustment component 31 as an example, the first adjustment component 31 includes a first mounting plate 311, a first support plate 312, and a first connecting frame 313 located on both sides of the first pressure roller 21, all mounted on the frame 11. The positions of the first mounting plate 311 and the second support plate are fixed. The first mounting plate 311 is provided with a first driving member 314, which passes through the first support plate 312 and is connected to the first connecting frame 313.

[0034] In this embodiment, the first driving component 314 is a motor lead screw module. The first driving component 314 includes a servo motor mounted on a first mounting plate 311. The output shaft of the servo motor is equipped with a lead screw. The output shaft of the servo motor passes through the first mounting plate 311 and is coaxially connected to the lead screw. The lead screw passes through and is rotatably connected to a first support plate 312 via a bearing. The first support plate 312 provides support for the lead screw, allowing it to rotate freely within the first support plate 312. After passing through the first support plate 312, the lead screw is threadedly connected to a first connecting frame 313. A thrust bearing is provided at the connection point between the lead screw and the first connecting frame 313 to reduce friction. Generally speaking, the adjustment range of the roller gap is not large. Therefore, a small adjustment margin is required at the connection between the lead screw and the first connecting frame 313 to achieve adjustment. That is, the roller gap can be adjusted by opening a threaded hole with a slightly larger hole depth in the first connecting frame 313. It can be understood that when the adjustment range required by the roller pressing device is large, the first connecting frame 313 can also be adapted to open a through-type threaded hole, and the lead screw is connected to the through-type threaded hole. At this time, there will be enough distance between the first connecting frame 313 and the first pressure roller 21 to avoid the first pressure roller 21 from contacting the lead screw.

[0035] Similarly, the second adjustment assembly 32 includes a second mounting plate, a second support plate, a second connecting frame, and a second driving component. With this configuration, the first driving component 314 or the second driving component drives the corresponding connecting frame to reciprocate along the corresponding lead screw, thereby adjusting the spacing between each roller. It should be noted that the first driving component 314 and the second driving component can be electric cylinders, hydraulic cylinders, or pneumatic cylinders. The corresponding piston end passes through the first support plate 312 and connects to the first connecting frame 313, depending on the actual needs.

[0036] Reference Figure 4 , Figure 5 as well as Figure 6To ensure the moving accuracy of the first pressure roller 21 and the third pressure roller 23, first sliders 211 are provided on both sides of the first pressure roller 21, and second sliders are provided on both sides of the second pressure roller 22. The frame 11 has grooves 111 corresponding to the first sliders 211 and the second sliders, and the first sliders 211 and the second sliders are slidably connected to the grooves 111. The first slider 211 is equipped with a motor for driving the first pressure roller 21 to rotate. The output shaft of the motor passes through the first slider 211 and is connected to the first pressure roller 21. The end of the first pressure roller 21 away from the motor is connected to the slider through a bearing to achieve rotation. The first connecting frame 313 is connected to the first slider 211. The second slider is equipped with a motor for driving the third pressure roller 23 to rotate. The output shaft of the motor passes through the second slider and is connected to the third pressure roller 23. The end of the third pressure roller 23 away from the motor is connected to the slider through a bearing to achieve rotation. The second connecting frame is connected to the second slider.

[0037] In this embodiment, a first guide limiting strip 212 is provided on one side of the first slider 211, and a second guide limiting strip is provided on one side of the second slider; the frame 11 has a corresponding guide limiting groove, which is located on one side of the slide groove 111, and the first guide limiting strip 212 and the second guide limiting strip are slidably connected to the guide limiting groove. When the driving component drives the corresponding pressure roller to move, the corresponding slider will move along the slide groove 111, and the corresponding guide limiting strip will move along the guide limiting groove, so that the pressure roller can move accurately, further improving the thickness adjustment accuracy of the multi-roller pressing device.

[0038] Looking back Figure 1 The detection structure 4 includes a thickness gauge mounted on the frame 11, facing the support belt 242. The thickness gauge includes several laser rangefinders arranged in a linear array above the support belt 242, with their measuring heads facing the upper surface of the support belt 242 for non-contact monitoring. The thickness gauge transmits the thickness data to the central control unit 13 in real time and compares it with a preset value. If there is a deviation in the material thickness, the central control unit 13 controls the corresponding adjustment components to adjust the roller spacing based on the deviation. The laser rangefinders are existing technology and can be purchased; their specific structure and principle will not be described in detail here.

[0039] The trimming structure 5 includes a trimming support 51 mounted on the frame 11 and a trimming cutter 52 mounted on the trimming support 51. The trimming cutter 52 faces the support belt 242. The winding structure 6 includes a winding roller 61 rotatably connected to the frame 11. After the dry electrode is rolled, it is trimmed by the trimming cutter 52 and then enters the winding roller 61 to be wound up.

[0040] Exemplary embodiments of this disclosure have been specifically shown and described above. It should be understood that this disclosure is not limited to the detailed structures, arrangements, or implementations described herein; rather, this disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. A multi-roller pressing device for dry electrode processing, comprising a base (1) wherein a frame (11) is provided on the base (1), characterized in that, It also includes a roll forming structure (2), a roll gap adjustment structure (3), a detection structure (4), a trimming structure (5), and a winding structure (6) disposed on the frame (11); the roll forming structure (2) includes a first pressure roller (21), a second pressure roller (22), and a third pressure roller (23) disposed in sequence, the first pressure roller (21) and the third pressure roller (23) being slidably connected to the frame (11), and the heights of the first pressure roller (21), the second pressure roller (22), and the third pressure roller (23) decreasing sequentially to be arranged at an inclination; the third pressure roller (23) is provided with a support assembly. The component (24) includes a plurality of traction rollers (241) rotating on the frame (11) and a support belt (242), the support belt (242) covering the traction rollers (241) and the third pressure roller (23); the roller gap adjustment structure (3) includes a first adjustment component (31) for driving the first pressure roller (21) and a second adjustment component (32) for the third pressure roller (23); the detection structure (4) includes a thickness detector disposed on the frame (11), the thickness detector facing the support belt (242).

2. The multi-roller pressing device for dry electrode according to claim 1, characterized in that, The axes of the first pressure roller (21), the second pressure roller (22) and the third pressure roller (23) are coplanar, and the plane containing the axes has an angle θ with the horizontal plane, which is 5-50°.

3. The multi-roller pressing device for dry electrode according to claim 1, characterized in that, The first adjustment component (31) includes a first mounting plate (311), a first support plate (312) disposed on the frame (11), and a first connecting frame (313) disposed on both sides of the first pressure roller (21); the first mounting plate (311) is provided with a first driving member (314), which passes through the first support plate (312) and is connected to the first connecting frame (313).

4. The multi-roller pressing device for dry electrode according to claim 3, characterized in that, The first driving component (314) includes a servo motor disposed on the first mounting plate (311). The output shaft of the servo motor is provided with a lead screw, which passes through the first support plate (312) and is connected to the first connecting frame (313).

5. The multi-roller pressing device for dry electrode according to claim 3, characterized in that, The structure of the second adjustment component (32) is the same as that of the first adjustment component (31); the first adjustment component (31) is located on the side of the first pressure roller (21) away from the second pressure roller (22), and the second adjustment component (32) is located on the side of the third pressure roller (23) away from the second pressure roller (22).

6. The multi-roller pressing device for dry electrode according to claim 1, characterized in that, The first pressure roller (21) is provided with a first slider (211) on both sides, and the second pressure roller (22) is provided with a second slider on both sides; the frame (11) is provided with a groove (111) corresponding to the first slider (211) and the second slider, and the first slider (211) and the second slider are slidably connected to the groove (111).

7. The multi-roller pressing device for dry electrode according to claim 6, characterized in that, A first guide limit strip (212) is provided on one side of the first slider (211), and a second guide limit strip is provided on one side of the second slider; the frame (11) is provided with a corresponding guide limit groove, which is located on one side of the slide groove (111), and the first guide limit strip (212), the second guide limit strip and the guide limit groove are slidably connected.

8. The multi-roller pressing device for dry electrode according to claim 1, characterized in that, The cutting structure (5) includes a cutting support (51) disposed on the frame (11) and a cutting tool (52) disposed on the cutting support (51), the cutting tool (52) facing the support belt (242).

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