A sodium-ion battery rolling mill

Abstract

This invention discloses a sodium-ion battery rolling device, including a rolling assembly comprising a pressure roller and a side frame. The rolling assembly further includes a driven roller and a steel strip. The steel strip is sleeved on the outside of the pressure roller and the driven roller. The contact portion between the steel strip and the slurry coating forms a compression section. The contact surface between the compression section and the slurry coating is sloped, with the slope facing the pressure roller. The driven roller has reciprocating components on both end faces that drive the compression section to reciprocate along the contact surface with the slurry coating, with the reciprocating movement direction perpendicular to the slurry coating transport direction. This invention increases the compression path of the slurry coating and reduces the compression amount by using the compression section, ensuring the internal material uniformity of the slurry coating after rolling. Furthermore, the reciprocating compression section can smooth out minor protrusions on the surface of the slurry coating, ensuring the final uniformity of the slurry coating thickness and effectively guaranteeing the final product quality.

Description

Technical Field

[0001] This invention relates to the field of sodium-ion battery electrode plate processing technology, specifically to a sodium-ion battery rolling equipment. Background Technology

[0002] The sodium-ion battery plate rolling process is one of the key processes in battery manufacturing. Its main purpose is to compact the coated and dried positive and negative electrode plates to achieve the target thickness, porosity, density and surface flatness, thereby improving the electrochemical performance and consistency of the battery.

[0003] In the prior art, Chinese utility model patent, publication number: CN210692676U, discloses a lead-acid battery electrode plate coating roller assembly, including an upper roller and a lower roller respectively installed at the upper and lower positions of the same bracket, and the distance between the upper and lower rollers can be adjusted according to the coating requirements of the electrode plate.

[0004] As can be seen from the above-mentioned prior art, existing electrode rolling equipment relies solely on two synchronously rotating pressure rollers to directly roll the slurry coating on the electrode surface. The contact point between the slurry and the pressure roller surface forms a compression surface, as shown in the appendix to this application specification. Figure 4 As shown, the slurry layers experience varying degrees of compression during transport. Although the final slurry layer thickness is uniform, the surface electrode material is compressed and compacted first when the slurry layer contacts the edge of the pressure roller. As the curvature of the pressure roller changes, the subsequent compression gradually decreases, resulting in a lower density of the material formed during later compression compared to the initially compressed surface material. Ultimately, although the electrode thickness becomes uniform, the internal structure of the electrode material exhibits density differences, with the surface material having a higher density than the internal material. This phenomenon significantly affects the final performance and quality of the electrode.

[0005] Furthermore, the surface of the slurry layer after coating and drying inevitably exhibits uneven distribution. Directly rolling and compacting it will exacerbate this unevenness in the distribution of electrode material after compaction. Moreover, areas with greater material thickness will have a higher density after compression than other areas, severely affecting the uniformity of electrode material distribution, directly reducing the wetting effect of the subsequent electrolyte, and consequently seriously impacting the overall performance of the electrode.

[0006] In summary, existing rolling equipment, which only uses traditional pressure rollers and heated rolling methods, cannot solve the problems of uneven coating thickness distribution and uneven compression. This makes it difficult for those skilled in the art to obtain electrode sheets with uniform electrode coating compression and more uniform distribution using existing rolling equipment and methods, thus preventing further improvement in electrode sheet performance. Summary of the Invention

[0007] The purpose of this invention is to provide a sodium-ion battery rolling device to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a sodium-ion battery rolling device, comprising a rolling assembly, the rolling assembly being composed of a pressure roller and a side frame, the rolling assembly further comprising a driven roller and a steel strip, the steel strip being sleeved outside the pressure roller and the driven roller, the contact portion of the steel strip with the slurry coating forming a compression section, the contact surface between the compression section and the slurry coating being sloping, and the sloping surface facing the pressure roller; The driven roller is provided with reciprocating components on both ends to drive the compression section to reciprocate along the contact surface with the slurry coating, and the reciprocating movement direction is perpendicular to the slurry coating transmission direction.

[0009] Preferably, the reciprocating assembly includes a guide rod and a guide sleeve; The guide rods are respectively fixed to both ends of the driven roller, and the guide sleeves are respectively sleeved on the outside of both ends of the driven roller; The end face of the guide sleeve is provided with a wave-shaped guide slope for the guide rod to slide and drive the driven roller to reciprocate.

[0010] Preferably, the steel strip moves synchronously with the compression section along the surface of the pressure roller, and the total distance between the two sides of the steel strip and the pressure roller is the same as the drop distance of the wavy guide slope.

[0011] Preferably, the wavy guide slope includes a recessed portion and a raised portion, and the surfaces and junctions of the recessed portion and the raised portion are smooth.

[0012] Preferably, the recessed portion corresponds to the protrusion at the other end of the driven roller, and the protrusion corresponds to the recessed portion at the other end of the driven roller.

[0013] Preferably, the width of the steel strip is greater than the width of the slurry coating.

[0014] Preferably, the inner wall of the steel strip is provided with uniformly distributed protrusions, and the protrusions are made of elastic material; The pressure roller and the driven roller each have grooves on their surfaces that are adapted to the convex ribs.

[0015] Preferably, it also includes a vibration assembly that drives the compression section to vibrate in the direction toward the slurry coating.

[0016] Preferably, the vibration assembly includes a contact plate and an elastic component; The elastic component pushes the contact plate to fit against the surface of the compression part; The contact plate has a plurality of raised ridges on the side facing the compression section, and the raised ridges are distributed alternately with the raised ridges.

[0017] Preferably, the vibration assembly further includes a limiting rod and a fixing plate; The limiting rod passes through the interior of the fixed plate and is used to limit the movement direction of the contact plate.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention achieves the effect of increasing the contact area with the electrode material and providing uniform compression through the compression section of the equipment. A uniformly reduced compression gap is formed between the compression section and the electrode transmission path, so that the electrode material is subjected to a balanced and consistent compression when passing through the compression gap, until it passes through the area of ​​the pressure roller, and finally forms an electrode material with uniform density.

[0019] 2. By setting up a reciprocating component, the present invention achieves the effect of reciprocatingly smoothing the surface of the electrode material, ensuring the uniform thickness of the electrode material. The reciprocating component drives the compression part to move back and forth on the surface of the electrode material. The reciprocating movement of the compression part can disperse the material of the protruding part on the surface of the electrode material to other areas, achieving the effect of smoothing the entire surface of the electrode material, ensuring that an electrode with uniform density is formed after rolling.

[0020] 3. The present invention achieves the effect of preventing electrode material from sticking to the surface of the compression part and vibration compaction through the vibration component. When the second protrusion and the first protrusion reciprocate, the resulting vibration can be transmitted to the compression part. The compression part can transmit the vibration to the contact surface with the electrode material, and perform vibration and patting compaction. In addition, the vibration can detach the electrode material attached to the surface of the compression part, preventing the problem of adhesion. Attached Figure Description

[0021] Figure 1 This is an exploded view of the components of the roll forming assembly of the present invention; Figure 2 This is a schematic diagram of the main structure of the roller pressing assembly and slurry coating of the present invention; Figure 3 This is a schematic diagram of the main structure of the compression section of the present invention; Figure 4 This is a schematic diagram of the contact area between the slurry coating and the pressure roller in the prior art; Figure 5 This is a schematic diagram of the positional distribution structure of the driven roller and reciprocating assembly of the present invention; Figure 6 This is a schematic diagram of the exploded structure of the reciprocating component axis of the present invention; Figure 7 This is a top view of the reciprocating component of the present invention; Figure 8This is a schematic diagram of the main structure of the vibration assembly of the present invention; Figure 9 For the present invention Figure 8 Enlarged structural diagram at point A in the middle.

[0022] In the picture: 100. Roller assembly; 110. Pressure roller; 111. Groove; 120. Driven roller; 121. Groove; 130. Steel strip; 131. Corrugated rib; 140. Side frame; 200. Compression section; 300. Reciprocating assembly; 310. Guide rod; 320. Guide sleeve; 321. Recess; 322. Protrusion; 400. Vibration assembly; 410. Contact plate; 411. Second rib; 420. Elastic component; 430. Limiting rod; 440. Fixing plate. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figures 1 to 9 The present invention provides two embodiments: Example 1: Please see Figures 1 to 7 A sodium-ion battery rolling device includes a rolling assembly 100, which consists of a pressure roller 110 and a side frame 140. The two ends of the pressure roller 110 are respectively mounted on the side frame 140. The side frame 140 is used to provide stable support for the pressure roller 110, and a bearing is provided at the connection between the side frame 140 and the pressure roller 110 to maintain the smooth operation of the pressure roller 110.

[0025] Please see Figures 1 to 3 The roller pressing assembly 100 also includes a driven roller 120 and a steel strip 130, with the steel strip 130 sleeved outside the pressure roller 110 and the driven roller 120.

[0026] The inner wall of the steel strip 130 is provided with evenly distributed ridges 131. The surfaces of the pressure roller 110 and the driven roller 120 are respectively provided with grooves 111 and 121 that are adapted to the ridges 131, and the width of the steel strip 130 is greater than the width of the slurry coating. The grooves 111 and 121 are used to engage with the ridges 131, thereby effectively ensuring the stable transmission of the steel strip 130 and preventing the steel strip 130 from slipping during transmission.

[0027] Specifically, the pressure roller 110 rotates and engages with the convex rib 131 through the groove 111, driving the steel belt 130 to transmit. The driven roller 120 tightens the steel belt 130. The steel belt 130 engages with the groove 121 through the convex rib 131, driving the driven roller 120 to rotate, forming a synchronous rotation effect of the three.

[0028] Please see Figure 2 and Figure 3 The contact area between the steel strip 130 and the slurry coating forms a compression section 200. The contact surface between the compression section 200 and the slurry coating is sloping, and the sloping surface faces the pressure roller 110.

[0029] Specifically, the compression section 200 extends the compression range of the slurry coating, and the driven roller 120 and the pressure roller 110 tighten the steel strip 130, so that the compression section 200 forms an inclined plane between the pressure roller 110 and the driven roller 120, thereby forming a uniformly reduced compression gap. This causes the electrode slurry coating to be subjected to a balanced and consistent compression amount when passing through the compression gap, until it passes through the area where the pressure roller 110 is located, ultimately forming an electrode material with uniform density.

[0030] Please see Figure 4 In the prior art, the compression range D2 is reduced in a non-uniform state in the transmission direction. In this solution, the compression range D1 is reduced in a uniform state in the transmission direction, and the length of D1 is greater than the length of D2. Finally, a compression range in which the compression is reduced uniformly along the transmission direction is obtained. This solution effectively solves the problem of compression difference in slurry coating in traditional rolling, and finally obtains the effect of uniform density inside the slurry coating, which can improve the final performance and quality of the electrode.

[0031] Please see Figures 5 to 7 The driven roller 120 is provided with reciprocating components 300 on both ends to drive the compression part 200 to reciprocate along the contact surface with the slurry coating. The reciprocating components 300 are used to drive the driven roller 120 and the steel belt 130 to reciprocate, and the reciprocating direction is perpendicular to the slurry coating transmission direction, thereby driving the compression part 200 to reciprocate against the slurry coating surface, thereby smoothing the slurry coating surface.

[0032] It is worth noting that the steel belt 130 synchronously follows the compression section 200 and moves back and forth along the surface of the pressure roller 110, and the total distance between the two sides of the steel belt 130 and the pressure roller 110 is the same as the drop distance of the wavy guide slope. This is to prevent the compression section 200 from leaving the range of the slurry coating during the reciprocating movement, thereby ensuring the completeness of the slurry coating roll pressing.

[0033] Specifically, the reciprocating assembly 300 includes a guide rod 310 and a guide sleeve 320.

[0034] Guide rods 310 are fixed to both ends of driven roller 120, and guide sleeves 320 are respectively sleeved on the outside of both ends of driven roller 120.

[0035] The end face of the guide sleeve 320 is provided with a wave-shaped guide slope for the guide rod 310 to slide and drive the driven roller 120 to move back and forth.

[0036] The wavy guide slope includes a recessed portion 321 and a raised portion 322, and the surfaces and junctions of the recessed portion 321 and the raised portion 322 are smooth.

[0037] The recessed portion 321 corresponds to the protrusion 322 at the other end of the driven roller 120, and the protrusion 322 corresponds to the recessed portion 321 at the other end of the driven roller 120.

[0038] Specifically, when the driven roller 120 rotates with the steel belt 130, the driven roller 120 drives the guide rod 310 at one end to move along the surface of the protrusion 322. The edge of the protrusion 322 guides the guide rod 310 to move laterally along the protrusion direction of the protrusion 322. This is coordinated with the guide rod 310 at the other end of the driven roller 120 moving along the surface of the recess 321 and towards the recess direction of the recess 321. The recess 321 is used to limit the lateral displacement driven by the protrusion 322 at the other end, thereby limiting the lateral displacement stroke of the driven roller 120 and maintaining the stability of the reciprocating movement of the steel belt 130 and the compression section 200.

[0039] Conversely, after the driven roller 120 moves to its maximum stroke on one side, the driven roller 120 continues to rotate, causing the guide rod 310 to slide along the edge of the recess 321 until it slides to the surface of the protrusion 322, thereby forming a reverse movement reset stroke, and repeating the above process.

[0040] Finally, with the continuous rotation of the driven roller 120, the guide rods 310 at both ends of the driven roller 120 slide continuously between the recessed portion 321 and the protruding portion 322, forming a reciprocating stroke of the driven roller 120, so that the compression portion 200 reciprocates on the surface of the electrode slurry coating.

[0041] It is worth noting that the convex rib 131 is made of elastic material, such as nitrile rubber, with a Shore hardness of 60±5HA and a thickness of 5mm, while the grooves 111 and 121 can be 3mm deep. This allows the convex rib 131 to retain 2mm of elastic redundancy during engagement. This prevents slippage through the mechanical engagement of the convex rib 131 with the grooves 111 and 121, and also compensates for the force deviation during the lateral movement of the driven roller through elastic deformation, thus avoiding the steel strip from being twisted due to rigid tension.

[0042] The protrusions 131 can be compressed to compensate for the force on the steel belt 130 during movement. The steel belt 130 is continuously transmitted with the pressure roller 110. Multiple protrusions 131 form an elastic buffer space between the inner wall of the steel belt 130 and the outer wall of the pressure roller 110 and the driven roller 120, eliminating the force deviation on the steel belt 130. Therefore, it avoids the problem of the steel belt 130 breaking due to the stress of its own torsion during reciprocating movement, and ensures that the steel belt 130 can be used stably for a long time.

[0043] One end of the steel strip 130 moves laterally under the push of the driven roller 120. After the position of the end of the steel strip 130 on the driven roller 120 changes, the inner wall of the steel strip 130 on the pressure roller 110 is squeezed by the protrusion 131 after being pulled, which compensates for the force it is subjected to. With the help of the pressure roller 110 to drive the steel strip 130 to be transmitted, the stroke of the steel strip 130 pushed by the driven roller 120 can be driven to the pressure roller 110, thus achieving the technical effect of the steel strip 130 moving laterally as a whole.

[0044] Specifically, when the compression unit 200 moves back and forth along the surface of the electrode slurry coating under the drive of the reciprocating component 300, the compression unit 200 disperses the material of the raised part of the electrode slurry coating surface to other areas through the reciprocating movement, so as to achieve the effect of smoothing the surface of the electrode material and ensure that a uniformly dense electrode is formed after rolling.

[0045] Finally, the slurry coating, after being smoothed and uniformly compressed, has uniform internal density, porosity, thickness, and surface, resulting in electrode products with better performance and quality.

[0046] Example 2: Based on the content of Embodiment 1 above, another embodiment is proposed: Please see Figure 8 and Figure 9 It also includes a vibration assembly 400 that drives the compression unit 200 to vibrate in the direction toward the slurry coating.

[0047] Specifically, the vibration assembly 400 includes a contact plate 410, an elastic component 420, a limiting rod 430, and a fixing plate 440. The two ends of the fixing plate 440 are fixedly connected to the side frame 140, respectively, to provide overall support for the vibration assembly 400.

[0048] A limiting rod 430 extends through the interior of the fixed plate 440 to limit the movement direction of the contact plate 410. An elastic member 420, which is a spring, pushes the contact plate 410 to fit against the surface of the compression part 200.

[0049] The surface of the contact plate 410 facing the compression section 200 is provided with a plurality of protrusions 411, which are distributed in an alternating manner with the protrusions 131.

[0050] Specifically, during the contact process between the compression section 200 and the slurry coating, the steel belt 130 moves continuously following the pressure roller 110, causing the first rib 131 and the second rib 411 to continuously intersect. When the protruding part of the second rib 411 contacts the protruding part of the first rib 131, the distance between the contact plate 410 and the surface of the compression section 200 reaches its maximum value. On the one hand, the contact plate 410 pushes the elastic component 420 to move, and on the other hand, the steel belt 130 in the area where the compression section 200 is located is also subjected to a small amount of thrust and undergoes a small-range deformation.

[0051] When the first protrusion 131 follows the steel strip 130 and intersects with the second protrusion 411, the elastic component 420 pushes out the contact plate 410 through the rebound force, and the contact plate 410 impacts the surface of the steel strip 130 as a whole, forming a vibration.

[0052] It is worth noting that, since the first rib 131 is elastic, the small-amplitude vibration generated when it intersects with the second rib 411 is transmitted through the first rib 131 to the steel belt 130, and then through the steel belt 130 to the surface of the slurry coating. Therefore, the vibration force is transmitted to the slurry coating through the steel belt 130.

[0053] As the steel belt 130 is continuously transported, the first rib 131 and the second rib 411 cyclically contact and alternately separate, forming periodic vibration. The resulting vibration is transmitted through the compression section 200 to the contact surface with the electrode material, where it is vibrated and compacted. Under the premise of constant compression, an additional external vibration force is applied. On the one hand, the material on the surface of the slurry coating is dispersed by vibration and compacted by vibration. On the other hand, the electrode material attached to the surface of the compression section 200 is detached by vibration to prevent adhesion problems.

[0054] Finally, the slurry coating passes under the pressure roller 110 to form a compressed and compacted electrode sheet.

[0055] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A sodium-ion battery roll-pressing apparatus comprising a roll-pressing assembly (100) consisting of a pressure roller (110) and a side frame (140), characterized in that: The roller pressing assembly (100) further comprises a driven roller (120) and a steel belt (130), the steel belt (130) is sleeved outside the pressure roller (110) and the driven roller (120), the steel belt (130) and the slurry coating contact part constitute a compression part (200), the compression part (200) and the slurry coating contact surface are in the form of a slope, and the slope is towards the pressure roller (110); The driven roller (120) is provided with a reciprocating assembly (300) on both sides of the end surface, which drives the compression part (200) to reciprocate along the slurry coating contact surface, and the reciprocating direction is perpendicular to the slurry coating transmission direction.

2. The sodium-ion battery roll press apparatus of claim 1, wherein: The reciprocating assembly (300) comprises a guide rod (310) and a guide sleeve (320); The guide rod (310) is fixed on both ends of the driven roller (120) respectively, and the guide sleeve (320) is sleeved outside both ends of the driven roller (120) respectively; The end surface of the guide sleeve (320) is provided with a wave-shaped guide slope for sliding of the guide rod (310) and driving the driven roller (120) to reciprocate.

3. The sodium-ion battery roll press apparatus of claim 2, wherein: The steel belt (130) synchronously follows the compression part (200) to reciprocate along the surface of the pressure roller (110), and the sum of the spacing between the two sides of the steel belt (130) and the pressure roller (110) is the same as the spacing of the wave-shaped guide slope.

4. The sodium-ion battery roll press apparatus of claim 3, wherein: The wave-shaped guide slope comprises a recessed part (321) and a protruding part (322), and the surface of the recessed part (321) and the protruding part (322) is smooth.

5. The sodium-ion battery roll press apparatus of claim 4, wherein: The recessed part (321) corresponds to the position of the protruding part (322) on the other end of the driven roller (120), and the protruding part (322) corresponds to the position of the recessed part (321) on the other end of the driven roller (120).

6. The sodium-ion battery roll press apparatus of claim 5, wherein: The width of the steel belt (130) is greater than the width of the slurry coating.

7. The sodium-ion battery roll press apparatus of claim 1, wherein: The inner wall of the steel belt (130) is provided with uniformly distributed convex ribs (131), and the convex ribs (131) are made of elastic material. The pressure roller (110) and the driven roller (120) are respectively provided with grooves (111, 121) matched with the convex ribs (131).

8. The sodium-ion battery roll press apparatus of claim 7, wherein: Further comprising a vibration assembly (400) for driving the compression part (200) to vibrate towards the slurry coating direction.

9. The sodium-ion battery roll press apparatus of claim 8, wherein: The vibration assembly (400) comprises a contact plate (410) and an elastic component (420); The elastic component (420) pushes the contact plate (410) to be attached to the surface of the compression part (200); The contact plate (410) is provided with a plurality of convex ribs (411) on the surface of one side of the compression part (200), and the convex ribs (411) are distributed in an interlaced manner with the convex ribs (131).

10. The sodium-ion battery roll press apparatus of claim 9, wherein: The vibration assembly (400) further comprises a limiting rod (430) and a fixed plate (440); The limiting rod (430) penetrates the inside of the fixed plate (440) to limit the moving direction of the contact plate (410).

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