Intelligent tabletting device for sodium ion battery pole piece production

Abstract

The invention belongs to the technical field of battery manufacturing equipment, and discloses an intelligent tabletting device for sodium ion battery pole piece production, which comprises a pair of primary compaction rollers, a detection mechanism, a bracket, a pair of secondary compaction rollers, a hydraulic station, a base and a central controller, on-line detection, matrix type fixed-point heating and hydraulic drive type local secondary compaction are integrated after primary compaction, an intelligent closed-loop repair system is constructed, the system can identify local defects of the pole piece in real time and accurately position the local defects, then defect points are selectively heated and softened, and the defect points are subjected to secondary compaction. And finally, precise local pressure supplement is implemented by the independently-controlled compaction block, so that the defect that the defect cannot be repaired on line through traditional single compaction is fundamentally overcome, post scrapping is converted into on-line repair, the consistency and the yield of pole piece production are remarkably improved, meanwhile, material waste is reduced, and the production cost is reduced. And high-quality and low-loss intelligent production is realized.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing equipment technology, and in particular to an intelligent pressing device for producing sodium-ion battery electrodes. Background Technology

[0002] In the production process of sodium-ion battery electrodes, the coated and dried electrodes need to undergo a rolling process to compact the surface active material coating, reduce porosity, increase density and conductivity, and control the overall thickness of the electrodes. Currently, this process generally uses a double-roll press, where the electrodes are compacted in one go under enormous pressure through the gap between a pair of precision rollers. This process mainly relies on preset static process parameters.

[0003] However, existing tableting technologies have significant drawbacks: 1. As it is an open-loop process, it cannot perform online real-time detection and feedback adjustment of the quality of the compacted electrode sheets. It lacks adaptability to factors such as fluctuations in the coating material and changes in equipment status, which can easily lead to poor consistency in the thickness and density of the electrode sheets within a batch. 2. Local defects that occur during the compaction process (such as slight protrusions, under-compression, and micro-cracks) cannot be identified and remedied in a timely manner, and can only become scrap or be downgraded in the later stages, resulting in material waste and yield loss.

[0004] Therefore, there is an urgent need to develop a tableting device that can sense the compaction status of the electrode in real time, dynamically adjust the process, and intelligently remedy local defects, so as to improve the consistency, stability and overall yield of electrode production quality. Summary of the Invention

[0005] This invention aims to provide an intelligent pressing device for sodium-ion battery electrode production, addressing the problems mentioned in the background section. By integrating online detection, matrix-style fixed-point heating, and hydraulically driven local secondary compaction after primary compaction, this invention constructs an intelligent closed-loop repair system. This system can identify and precisely locate local defects in the electrode in real time, then selectively heat and soften the defective points. Finally, a controllable compaction block performs precise local re-compression. This solution fundamentally overcomes the shortcomings of traditional single-compaction methods that cannot remedy defects online, transforming post-production scrapping into online repair. This significantly improves the consistency and yield of electrode production, while reducing material waste and achieving high-quality, low-loss intelligent production.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A smart pressing device for producing sodium-ion battery electrodes includes: One-to-one compaction roller; The detection mechanism is located on the discharge side of the primary compaction roller and is used to detect the electrode sheet after primary compaction and output defect location information. A support is located on the discharge side of the detection mechanism. A pair of oppositely arranged cover plates are connected to the support. The pair of cover plates are located on the upper and lower sides of the electrode conveying path, respectively. A plurality of heating bricks arranged in a matrix are connected to the end of the cover plate near the electrode. Heating tubes are connected to the heating bricks. A pair of secondary compaction rollers, both located on the discharge side of the cover plate, each secondary compaction roller has a hydraulic chamber inside its roller body, and multiple sets of mounting grooves are formed on the surface of the secondary compaction rollers along the axial direction. A compaction block is slidably connected in the mounting groove, and a spring is connected between the compaction block and the inner wall of the mounting groove. The hydraulic chamber is connected to the bottom of each mounting groove through an independent oil circuit, and an independent solenoid valve is connected to each oil circuit. The hydraulic station is connected to the hydraulic chamber via pipelines and rotary joints; The base, the primary compaction roller, the detection mechanism, the bracket and the secondary compaction roller are sequentially connected to the base along the electrode conveying path. The primary compaction roller and the secondary compaction roller are both connected to the base through bearing seats. The base is connected to a power mechanism for driving the primary compaction roller and the secondary compaction roller to rotate. The central controller, the detection mechanism, each heating tube, each solenoid valve, the hydraulic station and the drive mechanism are all electrically connected to the central controller; The central controller is configured to: receive the defect location information, control the opening and closing of the heating tube corresponding to the defect location according to the information, and control the drive mechanism, hydraulic station and corresponding solenoid valve to work together to make the corresponding compaction block bulge at a set position to perform local secondary compaction.

[0007] Preferably, the detection mechanism includes a visual detection unit for acquiring images of the electrode surface and a physical detection unit for detecting the electrode surface density and thickness.

[0008] Preferably, the heating bricks are arranged in a matrix on the cover plate, and the arrangement of the heating bricks along the width direction of the electrode corresponds one-to-one with the arrangement of the mounting grooves on the secondary compaction roller.

[0009] Preferably, the pair of secondary compaction rollers are configured such that when all the compaction blocks are in a non-protruding state, a gap is formed between the pair of secondary compaction rollers for the electrode sheet to pass through only; when some of the compaction blocks are controlled to protrude, compaction is applied to the electrode sheet only in the local area corresponding to the protruding compaction block.

[0010] Preferably, each set of mounting grooves has at least two compaction blocks arranged circumferentially along the secondary compaction roller.

[0011] Preferably, the working surface of the compaction block is an outwardly convex arc surface, and the plurality of compaction blocks are closely arranged in the circumferential and axial directions of the secondary compaction roller, so that when any one or more of the compaction blocks bulge, their working surfaces can smoothly transition with the working surfaces of adjacent compaction blocks, together forming a local continuous curved surface for extruding the electrode sheet.

[0012] Preferably, all side edges of the compacted block are chamfered.

[0013] Preferably, the device driving the secondary compaction roller in the power mechanism is a servo motor.

[0014] Preferably, the central controller is further configured to control the servo motor so that the secondary compaction roller rotates intermittently according to the defect location information.

[0015] Preferably, the central controller is further configured to control the heating tube corresponding to the defect location to turn on and off in a timed manner based on the defect location information and the electrode transmission speed.

[0016] The beneficial effects of this technical solution compared to existing technologies are as follows: (1) By setting up an online detection mechanism after the first compaction roller, 100% real-time, full-width scanning and defect location of the electrode compaction quality were achieved, transforming the production process from "open loop" to "closed loop", providing a data basis for precise intervention; (2) By using matrix-arranged and independently controllable heating bricks and hydraulically driven compaction blocks that can be locally raised, and mapping with detection information space, the identified defective parts are subjected to "surgical" fixed-point heating and local secondary compaction. Thus, without affecting the qualified area, local underpressure, protrusion and other defects are effectively repaired, and the waste or downgraded products in the traditional process are transformed into qualified products, directly improving the yield and reducing material loss. (3) By coordinating the timing of detection, heating, roller drive and hydraulic action through the central controller, the entire repair process is fully automated and intelligent, reducing the dependence on the operator's experience, improving the consistency of process stability and production efficiency, and providing reliable equipment for the high-quality and large-scale manufacturing of sodium-ion battery electrodes. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the inner structure of the cover plate provided by the present invention; Figure 3 This is a schematic diagram of the surface structure of the secondary compaction roller provided by the present invention; Figure 4This is a schematic diagram of the cross-sectional structure of the secondary compaction roller provided by the present invention; Figure 5 This is a schematic diagram of the working process of the secondary compaction roller provided by the present invention; Figure 6 This is a schematic diagram illustrating the coordinated operation of the various mechanisms provided in this invention.

[0018] Reference numerals: 1. Base; 2. Primary compaction roller; 3. Detection mechanism; 4. Support; 5. Cover plate; 6. Heating brick; 7. Heating tube; 8. Secondary compaction roller; 9. Hydraulic chamber; 10. Mounting groove; 11. Compacting block; 12. Spring; 13. Solenoid valve. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments: Overall technical solution overview: such as Figure 1 As shown, the device of the present invention includes, in sequence along the electrode conveying direction (from right to left in the figure), a primary compaction roller, a detection mechanism, a cover plate with integrated heating bricks, and a secondary compaction roller. All components are mounted on the same base and are uniformly coordinated and controlled by a central controller.

[0020] Its workflow is as follows: Figure 5-6 As shown, the electrode sheet is first compacted by a primary compaction roller; then, the inspection mechanism performs a 100% online scan of the compacted electrode sheet to identify and locate local defects (such as under-pressure protrusions); next, the heating brick corresponding to the defect location is activated to precisely and target the defective area with heat, softening its coating adhesive; finally, the corresponding compaction block on the secondary compaction roller protrudes at the appropriate time, applying local pressure to the softened defective area, completing the "surgical" repair compaction. The entire process is fully automated and intelligent, achieving a leap from "open-loop production" to "closed-loop quality control and repair".

[0021] Example 1 One-to-one compaction roller; The inspection mechanism is located on the discharge side of the primary compaction roller and is used to inspect the electrode sheet after primary compaction and output defect location information. The support is located on the discharge side of the testing mechanism. A pair of oppositely arranged cover plates are connected to the support. The pair of cover plates are located on the upper and lower sides of the electrode transmission path, respectively. Multiple heating bricks arranged in a matrix are connected to the end of the cover plate near the electrode. Heating tubes are connected to the heating bricks. A pair of secondary compaction rollers are located on the discharge side of the cover plate. The roller body of the secondary compaction rollers is provided with a hydraulic chamber. Multiple sets of mounting grooves are opened on the surface of the secondary compaction rollers along the axial direction. Compaction blocks are slidably connected in the mounting grooves. Springs are connected between the compaction blocks and the inner wall of the mounting groove. The hydraulic chamber is connected to the bottom of each mounting groove through an independent oil circuit. Each oil circuit is connected to an independent solenoid valve. The hydraulic power unit is connected to the hydraulic chamber via pipelines and rotary joints; The base, primary compaction roller, detection mechanism, support and secondary compaction roller are connected to the base in sequence along the electrode conveying path. The primary compaction roller and the secondary compaction roller are both connected to the base through bearing seats. The base is connected to a power mechanism for driving the primary compaction roller and the secondary compaction roller to rotate. The central controller, detection mechanism, each heating element, each solenoid valve, hydraulic station, and drive mechanism are all electrically connected to the central controller. The central controller is configured to: receive defect location information, control the opening and closing of the heating tube corresponding to the defect location based on the information, and control the coordinated action of the drive mechanism, hydraulic station and corresponding solenoid valve to make the corresponding compaction block bulge at the set position to perform local secondary compaction.

[0022] This embodiment defines the overall structure and basic control logic of the device of the present invention.

[0023] Detailed explanation of constituent components: Primary compaction roller: It functions the same as the compaction roller in a traditional tablet press. It is made of high-rigidity and high-hardness material and is fixed to the base by a bearing seat. It is driven to rotate continuously by a power mechanism (such as an AC motor through a reducer) to apply global and pre-set pressure to the incoming electrode to complete the first basic compaction. Its purpose is to provide an electrode substrate with better overall quality.

[0024] Inspection unit: This is the "eye" of the system. It is installed close to the discharge side of the primary compaction roller and is used to perform non-contact online inspection of the electrode immediately after it leaves the primary compaction roller. Its core task is to output accurate "defect location information". This information should at least include the coordinates of the defect in the width direction (X-axis) and length direction (Y-axis based on encoder signal) of the electrode, and may include the defect type (such as protrusion, dent) and size.

[0025] Support and cover plate: The support is a rigid structure used to support two cover plates located above and below the electrode to form a "repair tunnel". The cover plate is not only the mounting base of the heating brick, but also plays the role of heat insulation and safety protection.

[0026] Heating bricks and heating tubes: The heating bricks are modular, independent heating units, densely installed in a two-dimensional matrix on the inside of the upper and lower cover plates. Each heating brick contains an independent heating tube (preferably a medium- or short-wave infrared heating tube). This modular design facilitates maintenance and replacement, while the matrix arrangement provides a physical basis for subsequent localized selective heating.

[0027] Secondary compaction roller and its hydraulic actuation system: This is the core actuation component of the present invention, which realizes the breakthrough function of "local compaction".

[0028] Hydraulic chamber: Located inside the roller body, it serves as a common pressure oil source.

[0029] Mounting groove and compaction block: The mounting groove is arranged along the axial direction of the roller body and contains a sliding compaction block. When the compaction block is not in operation, its working surface is flush with the roller surface.

[0030] Return spring: Provides the driving force for the compaction block to return to its original position after the action is completed, ensuring reliability.

[0031] Oil circuit and solenoid valve: such as Figure 3 As shown, each independent oil circuit connects to the bottom of a hydraulic chamber and a mounting slot, and is controlled by a high-speed response miniature solenoid valve. When a solenoid valve opens, pressurized oil enters the bottom of the corresponding mounting slot, pushing the compaction block outward against the spring force. Hydraulic station and rotary joint: The hydraulic station provides a stable supply of pressurized oil, which is then transported from stationary pipelines to the hydraulic chamber of the rotating roller via the rotary joint.

[0032] Base and Power Mechanism: The base provides a stable foundation for the entire device. The power mechanism drives the primary compaction roller to rotate continuously and also drives the secondary compaction roller. The secondary compaction roller requires a high-precision positioning drive mechanism.

[0033] Central controller: As the "brain" of the device, it receives defect location information from the detection mechanism and performs complex coordinated control accordingly. First, it controls the opening and closing of the heating tube in the specific heating brick corresponding to the defect location coordinates. Second, it coordinates the control of the drive mechanism (to rotate the roller to the correct angle), the hydraulic station (to provide pressure), and the corresponding solenoid valve (to open at a precise moment), so that the target compaction block bulges at the moment the electrode defect reaches the roller gap, completing local secondary compaction.

[0034] Example 2 The testing facility includes a visual testing unit for acquiring images of the electrode surface and a physical testing unit for detecting the electrode surface density and thickness.

[0035] This embodiment further defines the specific composition of the testing organization: 1. Visual Inspection Unit: A high-resolution linear CCD camera, in conjunction with a coaxial light source or a bar light source, can be used to capture images of the electrode surface and identify macroscopic defects such as scratches, material adhesion, and wrinkles through image processing algorithms.

[0036] 2. Physical testing unit: A non-contact beta-ray surface density meter or a high-precision laser thickness gauge can be used to measure the unit area weight or thickness of the electrode in real time. By comparing with the standard value, the uniformity of the coating compaction density can be indirectly determined.

[0037] The data from both units are fused and processed in the central controller to generate comprehensive and accurate defect location information, covering both surface morphology and internal density, making detection more reliable.

[0038] Example 3 The matrix arrangement of the heating bricks on the cover plate corresponds one-to-one with the arrangement of the mounting grooves on the secondary compaction roller along the width of the electrode sheet.

[0039] This embodiment defines the spatial correspondence between the heating system and the compaction system.

[0040] This is a key design feature for achieving precise repair. During installation and commissioning, it is necessary to ensure that the transverse area covered by each column of heating bricks in the electrode width direction (X-axis) is strictly aligned with the transverse area covered by a certain (or a group of) mounting slots and their compaction blocks on the secondary compaction roller. For example, assuming the electrode width is divided into 10 control units, the defect in the 3rd control unit will be heated by the heating bricks in the 3rd column and finally compacted by the compaction blocks in the 3rd column. This "one-to-one" or "one-to-many" mapping relationship simplifies the control logic, avoids coordinate transformation errors, and ensures that the path from "perception" to "execution" is the shortest and most accurate.

[0041] Example 4 A pair of secondary compaction rollers are configured such that when all compaction blocks are in a non-protruding state, a gap is formed between the pair of secondary compaction rollers that allows only the electrode sheet to pass through. When some compaction blocks are controlled to protrude, compaction is applied to the electrode sheet only in the local area corresponding to the protruding compaction block.

[0042] This embodiment clarifies the two working states of the secondary compaction roller: 1. In the default standby state, all compacted blocks retract under the action of the return spring, and their working surfaces are flush with the roller surface. At this time, by adjusting the relative position of the bearing seats of the two secondary compaction rollers, the roller gap between the two rollers is made slightly larger than the nominal thickness of the electrode (for example, if the electrode thickness is 120μm, the roller gap can be set to 130μm). In this way, the electrode can pass through the station without resistance or any additional crushing, perfectly protecting the qualified area.

[0043] 2. When a defect is detected, the system enters a local working state. Through control logic, a specific compaction block is raised to form an actual compaction zone in the local area, achieving precise repair that can be done "point to point" while other areas remain unaffected.

[0044] Example 5 Each set of mounting slots contains at least two compaction blocks arranged circumferentially along the secondary compaction roller.

[0045] This embodiment optimizes the layout of the compacted blocks.

[0046] In each set of mounting slots, at least two compaction blocks (e.g., block A and block B) are arranged side by side along the circumference of the roller (i.e., the direction of rotation). This design greatly enhances the flexibility of the device. For small point defects, only block A can be controlled to bulge and apply a pulse pressure. For strip-shaped defects that are slightly longer along the machine direction, blocks A and B can be controlled to bulge one after the other to form a short, continuous compaction band, ensuring that the defect is fully rolled and covered. This essentially "pixelates" the compaction action in the length direction, and can intelligently match the "compaction strategy" according to the "shape" of the defect.

[0047] Example 6 The working surface of the compaction block is an outwardly convex arc surface. Multiple compaction blocks are closely arranged in the circumference and axial direction of the secondary compaction roller, so that when any one or more compaction blocks bulge, their working surface can smoothly transition with the working surface of the adjacent compaction block, together forming a local continuous curved surface for extruding the electrode sheet.

[0048] This embodiment defines the shape of the working surface of the compacted block and its synergistic effect.

[0049] like Figure 2 As shown, the working surface of each compaction block is machined into an outwardly convex arc surface, and its radius of curvature is carefully designed to match or optimize the overall roller surface curvature of the secondary compaction roller. More importantly, multiple compaction blocks are closely arranged in the circumferential and axial directions with extremely high machining and assembly precision. This allows their arc surfaces to seamlessly connect when multiple adjacent compaction blocks bulge simultaneously according to control commands, forming a smooth, continuous local curved surface rather than a series of discrete steps. This local curved surface can perform uniform, stable, and stress-free rolling on the defective parts of the electrode sheet, just like a small section of standard roller, thereby achieving excellent repair results and avoiding new defects caused by uneven contact.

[0050] Example 7 All sides of the compacted block are chamfered.

[0051] This embodiment is an important security design.

[0052] All compaction blocks have chamfered edges (i.e., edges that contact adjacent compaction blocks or the sidewalls of the mounting groove). The primary purpose of this design is to prevent scratching the electrode sheet. When a compaction block on one edge protrudes while its adjacent block does not, without chamfering, a sharp vertical step will be formed. The electrode sheet, whose surface coating softens after heating, is easily scratched by this "sharp blade." The chamfering process makes this transition area smooth, eliminating the risk of damage. Secondly, it also facilitates the smooth sliding of the compaction block in the mounting groove, reducing jamming.

[0053] Example 8 The device driving the secondary compaction roller in the power mechanism is a servo motor, and the central controller is also configured to control the servo motor so that the secondary compaction roller rotates intermittently according to the defect location information.

[0054] This embodiment defines the preferred driving and control method for the secondary compaction roller.

[0055] The preferred device for driving the secondary compaction roller is a servo motor. Servo motors are characterized by fast response, accurate positioning, and precise control of speed and angle, perfectly matching the "intermittent, fixed-point" operation requirements of this device. The central controller's control logic for the servo motor is "intermittent rotation." Specifically, when there are no defects, the servo motor can remain stationary. When a defect is detected and heating is completed, the central controller accurately calculates the time it takes for the defect to reach the compaction roller gap based on the defect's Y-coordinate and the electrode speed. At that time, the controller instructs the servo motor to start quickly, driving the secondary compaction roller to rotate through a set angle (for example, just enough to rotate the target compaction block to the top of the compaction zone). After the compaction action is completed, the motor can stop immediately or reverse to reset. This working mode is energy-saving and efficient, and can significantly reduce mechanical wear and interference to non-defect areas, reflecting intelligent and refined manufacturing.

[0056] Example 9 The central controller is also configured to control the heating tube corresponding to the defect location to turn on and off in a timed manner based on the defect location information and the electrode transmission speed.

[0057] This embodiment defines an optimized heating control strategy called "timing-based on / off".

[0058] Since the electrode is in continuous motion while the heating bricks are stationary, simple instantaneous activation is insufficient to fully and uniformly heat the moving defect area. The central controller performs the following calculations and controls based on the defect location information and the real-time electrode transmission speed: Assuming there are three rows of heating bricks (M1, M2, M3) along the length of the heating zone, when the defect front reaches row M1, the heating brick corresponding to the X coordinate is activated; when the defect moves to row M2, the corresponding heating brick in row M2 is activated, while row M1 is deactivated; the same applies when it moves to row M3. In this way, the defect area is continuously irradiated by a "moving hot spot" throughout the entire journey from M1 to M3 during its movement, extending the heating time and ensuring more uniform heat penetration. This ensures that the coating softening effect reaches its optimal level, creating ideal conditions for subsequent secondary compaction.

[0059] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An intelligent pressing device for producing sodium-ion battery electrodes, characterized in that, include: One pair of primary compaction rollers (2); The detection mechanism (3) is located on the discharge side of the primary compaction roller (2) and is used to detect the electrode sheet after primary compaction and output defect location information. The bracket (4) is located on the discharge side of the detection mechanism (3). A pair of oppositely arranged cover plates (5) are connected to the bracket (4). The pair of cover plates (5) are located on the upper and lower sides of the electrode transmission path, respectively. A plurality of heating bricks (6) arranged in a matrix are connected to one end of the cover plate (5) near the electrode. Heating tubes (7) are connected to the heating bricks (6). A pair of secondary compaction rollers (8) are located on the discharge side of the cover plate (5). The roller body of the secondary compaction roller (8) is provided with a hydraulic chamber (9). The surface of the secondary compaction roller (8) is provided with multiple sets of mounting grooves (10) along the axial direction. A compaction block (11) is slidably connected in the mounting groove (10). A spring (12) is connected between the compaction block (11) and the inner wall of the mounting groove (10). The hydraulic chamber (9) is connected to the bottom of each mounting groove (10) through an independent oil circuit. An independent solenoid valve (13) is connected to each oil circuit. The hydraulic station is connected to the hydraulic chamber (9) via pipelines and rotary joints; The base (1), the primary compaction roller (2), the detection mechanism (3), the bracket (4) and the secondary compaction roller (8) are sequentially connected to the base (1) along the electrode conveying path. The primary compaction roller (2) and the secondary compaction roller (8) are connected to the base (1) through bearing seats. The base (1) is connected to a power mechanism for driving the primary compaction roller (2) and the secondary compaction roller (8) to rotate. The central controller, the detection mechanism (3), each heating tube (7), each solenoid valve (13), the hydraulic station and the drive mechanism are all electrically connected to the central controller; The central controller is configured to: receive the defect location information, control the opening and closing of the heating tube (7) corresponding to the defect location according to the information, and control the drive mechanism, hydraulic station and corresponding solenoid valve (13) to work together to make the corresponding compaction block (11) protrude at the set position to perform local secondary compaction.

2. The intelligent pressing device for producing sodium-ion battery electrodes as described in claim 1, characterized in that: The detection mechanism (3) includes a visual detection unit for acquiring images of the electrode surface and a physical detection unit for detecting the surface density and thickness of the electrode.

3. The intelligent pressing device for producing sodium-ion battery electrodes as described in claim 1, characterized in that: The heating bricks (6) are arranged in a matrix on the cover plate (5), and the arrangement of the heating bricks (6) along the width direction of the electrode corresponds one-to-one with the arrangement of the mounting grooves (10) on the secondary compaction roller (8).

4. The intelligent pressing device for producing sodium-ion battery electrodes as described in claim 1, characterized in that: The pair of secondary compaction rollers (8) are configured such that when all the compaction blocks (11) are in a non-protruding state, a gap is formed between the pair of secondary compaction rollers (8) for the electrode sheet to pass through only. When some of the compaction blocks (11) are protruding in a controlled manner, the electrode sheet is compacted only in the local area corresponding to the protruding compaction block (11).

5. The intelligent pressing device for producing sodium-ion battery electrodes as described in claim 1, characterized in that: Each set of mounting grooves (10) has at least two compaction blocks (11) arranged circumferentially along the secondary compaction roller (8).

6. The intelligent pressing device for producing sodium-ion battery electrodes as described in claim 1, characterized in that: The working surface of the compaction block (11) is an outwardly convex arc surface. Multiple compaction blocks (11) are closely arranged in the circumferential and axial directions of the secondary compaction roller (8), so that when any one or more compaction blocks (11) bulges out, its working surface can smoothly transition with the working surface of the adjacent compaction block (11) to form a local continuous curved surface for extruding the electrode sheet.

7. The intelligent pressing device for producing sodium-ion battery electrodes as described in claim 1, characterized in that: All sides of the compacted block (11) are chamfered.

8. The intelligent pressing device for producing sodium-ion battery electrodes as described in claim 1, characterized in that: The device that drives the secondary compaction roller (8) in the power mechanism is a servo motor.

9. The intelligent pressing device for producing sodium-ion battery electrodes as described in claim 8, characterized in that: The central controller is also configured to control the servo motor so that the secondary compaction roller (8) rotates intermittently according to the defect location information.

10. The intelligent pressing device for producing sodium-ion battery electrodes as described in claim 1, characterized in that: The central controller is also configured to control the heating tube (7) corresponding to the defect location to turn on and off in a time sequence according to the defect location information and the electrode transmission speed.

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