Flattening roller, pole piece rolling device and pole piece processing equipment
By designing an integrally formed roller body and ring structure on the flattening roller, combined with the setting of textured grooves, the problem of non-coated areas of the electrode caused by Teflon wear was solved, achieving flatness and uniformity of the electrode and improving processing quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-10
- Publication Date
- 2026-03-10
AI Technical Summary
In the existing technology, the non-coated areas of the Teflon-coated sheet adhered to the flattening roller are prone to wear after long-term use, resulting in wrinkles in the non-coated areas of the electrode sheet, poor dimensional quality after stretching, and problems with the cut strip.
The design employs an integrally molded roller body and a first ring to form an extended area between the coated and uncoated areas of the electrode sheet, replacing Teflon, reducing concentricity error and improving smoothness. By setting textured grooves on the outer side of the ring to increase friction, the uniformity of electrode sheet extension is ensured.
It effectively avoids wrinkles and dimensional defects in the non-coated area of the electrode, improves the uniformity of the stretching in the non-coated area of the electrode, reduces the occurrence of cutting strips, and improves the yield of electrode processing.
Smart Images
Figure CN223980997U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power battery technology, and in particular to a flattening roller, an electrode rolling device, and an electrode processing equipment. Background Technology
[0002] Battery electrodes are an important component of power batteries, such as lithium-ion batteries. The manufacturing process of battery electrodes mainly includes four steps: stirring, coating, rolling, and die-cutting. For example, after the coating process, the coated electrode includes a coated area and an uncoated area (also called a blank area). The electrode is then rolled, a process that primarily extends the electrode to a certain thickness, increases the smoothness of the electrode surface, and reduces defects such as burrs or unevenness.
[0003] Because there is a thickness difference between the coated and uncoated areas, Teflon is usually bonded to the corresponding area of the uncoated area on the flattening roller to compensate for the thickness difference. However, Teflon is prone to wear or foreign matter residue after prolonged use, which can easily cause wrinkles in the uncoated area, poor dimensional accuracy after stretching, and problems with the cut strip. Utility Model Content
[0004] To address the problems that occur when using Teflon adhesive to cover the non-coated areas of the electrode sheet on a flattening roller for extended periods to compensate for thickness differences, which can easily lead to wrinkling in the non-coated areas, poor dimensional accuracy after stretching, and issues with cutting the strip, this invention provides a flattening roller, an electrode sheet pressing device, and an electrode sheet processing equipment that overcomes or at least partially solves the aforementioned problems.
[0005] Based on a first aspect of this utility model, a flattening roller is provided, the flattening roller comprising a roller body and at least a pair of first ring portions, the at least pair of first ring portions being spaced apart along the axial direction of the roller body to form a coating extension region of the electrode coating area; wherein...
[0006] The roller body is integrally formed with the first ring portion and is coaxial with the first ring portion. Furthermore, the surface of the first ring portion forms an uncoated extension area of the electrode uncoated region.
[0007] An optional utility model includes a first textured groove provided on the outer surface of the first ring portion away from the roller body.
[0008] One optional utility model embodiment is that the shape of the first texture groove includes at least one of the following: a straight groove and a curved groove.
[0009] In one optional utility model, the flattening roller further includes a second ring portion, the second ring portion being located on the end face of the first ring portion near the coating film spreading area; wherein,
[0010] The second ring portion is integrally formed with the roller body and is coaxial with the roller body. The outer side of the second ring portion away from the roller body forms a ceramic extension area of the electrode ceramic region.
[0011] One optional utility model involves a structure formed by the surface of the roller body, the second ring portion, and the first ring portion, wherein the cross-section along the axial direction of the roller body is stepped.
[0012] An optional utility model includes a first textured groove provided on the outer surface of the first ring portion away from the roller body; and / or,
[0013] A second textured groove is provided on the outer surface of the second ring portion away from the roller body.
[0014] In one optional utility model, the thickness of the first ring portion in the radial direction is set between 50 and 300 micrometers.
[0015] In one optional utility model, when there are at least two pairs of first ring portions, the two first ring portions located between two adjacent coating extension regions are an integral structure.
[0016] Based on a second aspect of this utility model, an electrode rolling device is also provided, the electrode rolling device including a support base and a flattening roller as described in any one of the above utility model contents, wherein the flattening roller is rotatably connected to the support base.
[0017] Based on a third aspect of this utility model, an electrode processing device is also provided, the electrode processing device including the electrode rolling device as described above.
[0018] Compared with the prior art, this utility model includes a roller body and at least one pair of first ring portions. The at least one pair of first ring portions are spaced apart along the axial direction of the roller body to form a coating extension area in the electrode coating region. The roller body is integrally formed with and coaxial with the first ring portions, and the surface of the first ring portions forms a non-coating extension area in the electrode non-coating region. Therefore, by integrally forming the first ring portions on the roller body, the thickness difference between the electrode coating region and the electrode non-coating region can be compensated for, instead of using Teflon in the prior art. The integral forming design of the first ring portions with the roller body can reduce concentricity errors and improve the smoothness of the first ring portions over long-term use, thereby preventing wrinkling in the electrode non-coating region, improving the extension consistency of the electrode non-coating region, and thus avoiding poor electrode dimensions and cutting strips after extension.
[0019] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description
[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings.
[0021] In the attached diagram:
[0022] Figure 1 This is a partial cross-sectional structural diagram of the first type of flattening roller provided in this embodiment of the utility model;
[0023] Figure 2 This is a schematic diagram of the structure of the second type of flattening roller provided in this embodiment of the utility model;
[0024] Figure 3 This is a partial structural schematic diagram of the third type of flattening roller provided in this embodiment of the utility model;
[0025] Figure 4 This is a three-dimensional structural schematic diagram of the fourth type of flattening roller provided in this embodiment of the utility model;
[0026] Figure 5 This is a partial cross-sectional structural diagram of the fourth type of flattening roller provided in this embodiment of the utility model;
[0027] Figure 6 This is a structural schematic diagram of the fifth type of flattening roller provided in this embodiment of the utility model;
[0028] Reference numerals: 1. Roller body; 101. Coating extension area; 2. First ring; 201. Non-coating extension area; 202. First texture groove; 3. Second ring; 301. Ceramic extension area; 302. Second texture groove; 4. Electrode coating area; 5. Electrode non-coating area; 6. Electrode ceramic area. Detailed Implementation
[0029] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
[0030] Battery electrodes are an important component of power batteries, such as lithium-ion batteries. The manufacturing process of battery electrodes mainly includes four steps: stirring, coating, rolling, and die-cutting. For example, after the coating process, the coated electrode includes a coated area and an uncoated area (also called a blank area). The electrode is then rolled, a process that primarily extends the electrode to a certain thickness, increases the smoothness of the electrode surface, and reduces defects such as burrs or unevenness.
[0031] Because there is a thickness difference between the coated and uncoated areas, Teflon is usually bonded to the corresponding area of the uncoated area on the flattening roller to compensate for the thickness difference. However, Teflon is prone to wear or foreign matter residue after prolonged use, which can easily cause wrinkles in the uncoated area, poor dimensional accuracy after stretching, and problems with the cut strip.
[0032] Based on the aforementioned technical problems, this utility model is proposed. An embodiment of this utility model may include a roller body 1 and at least one pair of first ring portions 2. The at least one pair of first ring portions 2 are spaced apart along the axial direction of the roller body 1 to form a coating extension region 101 of the electrode coating region 4. The roller body 1 is integrally formed with and coaxial with the first ring portions 2. Furthermore, the surface of the first ring portions 2 forms a non-coating extension region 201 of the electrode non-coating region 5. Thus, by integrally forming the first ring portions 2 on the roller body 1, the thickness difference between the electrode coating region 4 and the electrode non-coating region 5 can be compensated for, instead of using Teflon in the prior art. The integral forming design of the first ring portions 2 and the roller body 1 can reduce concentricity errors and improve the smoothness of the first ring portions 2 under long-term use, thereby preventing wrinkling of the electrode non-coating region 5, improving the extension consistency of the electrode non-coating region 5, and thus avoiding poor electrode dimensions and cutting strips after extension.
[0033] Reference Figure 1-6 This utility model provides a flattening roller, which includes a roller body 1 and at least one pair of first ring portions 2. The at least one pair of first ring portions 2 are spaced apart along the axial direction of the roller body 1 to form a coating extension region 101 of the electrode coating region 4. The roller body 1 is integrally formed with the first ring portions 2 and is coaxial with the first ring portions 2. Furthermore, the surface of the first ring portions 2 forms a non-coating extension region 201 of the electrode non-coating region 5.
[0034] In this embodiment of the invention, the flattening roller is an important component used in the production process of power batteries to flatten the electrode sheets. The flattening roller applies a certain pressure and tension to the electrode sheets, thereby stretching out the wrinkles and improving the flatness of the electrode sheets. This reduces problems such as tab folding and poor die-cutting caused by uneven electrode sheets during the die-cutting process. Two or more flattening rollers can be provided, allowing the electrode sheets to be stretched and flattened by compression between the two or more flattening rollers. In another embodiment, the flattening roller can also be used in conjunction with a winding assembly, so that when the electrode sheets pass through the flattening rollers, a certain tension can be applied to the electrode sheets, causing the electrode sheets to be stretched in the length and width directions. The number of flattening rollers is not limited here.
[0035] The flattening roller includes a roller body 1 and at least one pair of first ring portions 2, wherein the roller body 1 is a cylindrical structure. The at least one pair of first ring portions 2 are spaced apart along the axial direction of the roller body 1. That is, for a pair of first ring portions 2, the distance between the two first ring portions 2 in the axial direction of the roller body 1 is consistent with the width of the electrode coating area 4, so that when the flattening roller performs rolling, the surfaces of the roller body 1 in the intervals contact the electrode coating area 4, forming the coating extension region 101 of the electrode coating area 4.
[0036] The roller body 1 and the first ring portion 2 are integrally formed. The roller body 1 and the first ring portion 2 are coaxial, which can be understood as the central axis of the roller body 1 coinciding with the central axis of the first ring portion 2. On the one hand, this reduces the production cost of the flattening roller, saves production steps, and improves the concentricity of the roller body 1 and the first ring portion 2, avoiding reduced electrode stretching consistency due to concentricity errors between the first ring portion 2 and the roller body 1. On the other hand, the integral design of the roller body 1 and the first ring portion 2 can prevent powder (such as active material powder, silicon-based material powder, and metal powder) from entering the connection gap between the roller body 1 and the first ring portion 2, thus preventing excessive dust from entering the electrode surface through the gap during electrode rolling and affecting the flatness of the electrode.
[0037] Therefore, during the rolling process of the electrode sheet by the flattening roller, the electrode sheet coating area 4 is located between a pair of first ring portions 2 and is in contact with the surface of the roller body 1. The first ring portions 2 extend outward in the radial direction of the roller body 1 with a certain thickness, which is consistent with the thickness difference between the electrode sheet coating area 4 and the electrode sheet uncoated area 5. Thus, the first ring portions 2 are away from the surface of the roller body 1, forming the uncoated extension area 201 of the electrode sheet uncoated area 5. While the electrode sheet coating area 4 is in surface contact with the surface of the roller body 1, the electrode sheet uncoated area 5 is in surface contact with the surface of the first ring portion 2.
[0038] In this application, the first ring portion 2 replaces the Teflon used in the prior art to compensate for the thickness difference between the coated area 4 and the uncoated area 5 of the electrode. The integral molding design of the first ring portion 2 and the roller body 1 can reduce concentricity error and improve the smoothness of the first ring portion 2 under long-term use, thereby avoiding wrinkling of the uncoated area 5 of the electrode and improving the elongation consistency of the uncoated area 5 of the electrode.
[0039] An optional embodiment of the utility model, referring to... Figure 2 , Figure 3 as well as Figure 6 As shown, a first textured groove 202 is provided on the outer side of the first ring portion 2 away from the roller body 1.
[0040] In this embodiment of the invention, a first textured groove 202 is provided on the outer surface of the first ring portion 2 away from the roller body 1, that is, the non-coated extension area 201 of the first ring portion 2. This increases the friction between the electrode and the first ring portion 2 during the rolling process. Under this increased friction, the non-coated area 5 of the electrode extends towards the coated area 4, thereby further reducing wrinkling in the non-coated area 5 of the electrode.
[0041] In one implementation, refer to Figure 3 As shown, the first textured groove 202 can be a straight groove. For example, the first textured groove 202 can be formed on the outer surface of the first ring portion 2 in a direction parallel to the axial direction of the roller body 1. In another embodiment, refer to... Figure 2 or Figure 6 As shown, the shape of the first texture groove 202 on the outer side of the first ring portion 2 can be a curved groove.
[0042] An optional embodiment of the utility model, referring to... Figure 4 , Figure 5 as well as Figure 6As shown, the flattening roller further includes a second ring portion 3, which is located on the end face of the first ring portion 2 near the coating extension region 101. The second ring portion 3 is integrally formed with the roller body 1 and is coaxial with the roller body 1. The outer surface of the second ring portion 3 away from the roller body 1 forms the ceramic extension region 301 of the electrode ceramic region 6.
[0043] In this embodiment of the invention, the positive electrode of the power battery may also be coated with a ceramic coating to form an electrode ceramic region 6. The electrode ceramic region 6 can improve the performance of the power battery, such as increasing ionic conductivity, suppressing thermal runaway, and improving electrode flexibility. The electrode ceramic region 6 is located between the electrode coating region 4 and the electrode non-coating region 5. Therefore, the flattening roller may also include a second ring portion 3, located on the end face of the first ring portion 2 near the coating extension region 101. The second ring portion 3 is located away from the outer side of the roller body 1. The ceramic extension region 301 of the positive electrode ceramic region 6 can be formed. Conversely, when rolling the negative electrode of the power battery, since it does not have an electrode ceramic region 6, a flattening roller without the second ring portion 3 is selected for rolling.
[0044] The roller body 1 and the second ring portion 3 are integrally formed. The roller body 1 and the second ring portion 3 are coaxial, which can be understood as the central axis of the roller body 1 coinciding with the central axis of the second ring portion 3. On the one hand, this reduces the production cost of the flattening roller, saves production steps, and improves the concentricity of the roller body 1 and the second ring portion 3, avoiding a decrease in the uniformity of the extension of the electrode ceramic region 6 due to concentricity errors between the second ring portion 3 and the roller body 1. On the other hand, the integral design of the roller body 1 and the second ring portion 3 can prevent powder (such as active material powder, silicon-based material powder, and metal powder) from entering the connection gap between the roller body 1 and the second ring portion 3, thus preventing excessive dust from entering the electrode surface through the gap during electrode rolling and affecting the flatness of the electrode.
[0045] The width spacing between the two second ring portions 3 located on both sides of the same coating extension area 101 is consistent with the extension width of the coating extension area 101 (the length of the coating extension area 101 along the axial direction of the roller body 1). Therefore, during the rolling process of the electrode sheet by the flattening roller, the electrode sheet coating area 4 is located in the coating extension area 101 and forms surface contact with the surface of the roller body 1. The electrode sheet ceramic area 6 is located in the ceramic extension area 301 of the second ring portion 3 and forms surface contact with the outer surface of the second ring portion 3. The electrode sheet non-coated area 5 is located in the non-coated extension area 201 of the first ring portion 2 and forms surface contact with the outer surface of the first ring portion 2. Thus, the second ring portion 3 compensates for the thickness difference between the electrode sheet coating area 4 and the electrode sheet ceramic area 6, and the first ring portion 2 compensates for the thickness difference between the electrode sheet coating area 4 and the electrode sheet non-coated area 5, further improving the uniformity of electrode sheet extension.
[0046] An optional embodiment of the utility model, referring to... Figure 5 As shown, the structure formed by the surface of the roller body 1, the second ring portion 3, and the first ring portion 2 has a stepped cross-section along the axial direction of the roller body 1.
[0047] In this embodiment of the invention, the structure formed by the surface of the roller body 1, the second ring portion 3, and the first ring portion 2 has a stepped cross-section along the axial direction of the roller body 1. That is, the depth of the coating extension region 101 is deeper than the depth of the ceramic extension region 301. For the electrode, the thickness of the electrode coating region 4 is greater than the thickness of the electrode ceramic region 6, and the thickness of the electrode ceramic region 6 is greater than the thickness of the electrode non-coating region 5.
[0048] An optional embodiment of the utility model, referring to... Figure 2 , Figure 3 as well as Figure 6 As shown, a first textured groove 202 is provided on the outer surface of the first ring portion 2 away from the roller body 1. And / or, a second textured groove 302 is provided on the outer surface of the second ring portion 3 away from the roller body 1.
[0049] In this embodiment of the invention, a first textured groove 202 is provided on the outer surface of the first ring portion 2 away from the roller body 1, i.e., the non-coated extension area 201 of the first ring portion 2. This increases the friction between the electrode and the first ring portion 2 during the rolling process. Under this increased friction, the non-coated area 5 of the electrode extends towards the coated area 4, thereby further reducing wrinkling in the non-coated area 5. In one embodiment, the first textured groove 202 can be a straight groove. For example, the first textured groove 202 can be formed on the outer surface of the first ring portion 2 in a direction parallel to the axial direction of the roller body 1. In another embodiment, the shape of the first textured groove 202 on the outer surface of the first ring portion 2 can be a curved groove.
[0050] On the outer surface of the second ring portion 3 away from the roller body 1, i.e., in the ceramic extension region 301 of the second ring portion 3, a second textured groove 302 is provided, such as... Figure 6 As shown. This increases the friction between the electrode ceramic region 6 and the second ring portion 3 during the electrode rolling process. Under this increased friction, the electrode ceramic region 6 extends towards the electrode coating region 4, thereby further reducing wrinkling of the electrode ceramic region 6. In one embodiment, the second textured groove 302 can be a straight groove. For example, the second textured groove 302 can be formed on the outer surface of the second ring portion 3 in a direction parallel to the axial direction of the roller body 1. In another embodiment, refer to... Figure 6 As shown, the shape of the second texture groove 302 on the outer side of the second ring portion 3 can be a curved groove.
[0051] For example, when rolling the positive electrode sheet of a power battery, the first ring portion 2 of the flattening roller can be provided with a first textured groove 202. Alternatively, the second ring portion 3 of the flattening roller can be provided with a second textured groove 302. Or, the first ring portion 2 of the flattening roller can be provided with a first textured groove 202, and the second ring portion 3 can be provided with a second textured groove 302. Those skilled in the art can determine the specific structure of the flattening roller according to actual processing requirements, and no further limitations are made here.
[0052] An optional embodiment of the utility model, referring to... Figure 1 As shown, the thickness of the first ring portion 2 in the radial direction is set between 50 and 300 micrometers.
[0053] In this embodiment of the invention, the thickness of the first ring portion 2 in the radial direction is consistent with the coating thickness of the electrode coating area 4, considering that the coating thickness of the electrode coating area 4 is set within 50 to 300 micrometers. Correspondingly, the thickness W1 of the first ring portion 2 in the radial direction is also set between 50 and 300 micrometers, thereby ensuring that during the rolling process, when the electrode coating area 4 contacts the coating extension area 101, the electrode non-coating area 5 simultaneously contacts the first ring portion 2. This improves the consistency of the stretching and extension of the electrode coating area 4 and the electrode non-coating area 5, and further improves the production yield of the power battery.
[0054] In some embodiments, the thickness W1 of the first ring portion 2 in the radial direction can be set to 50 micrometers, 80 micrometers, 120 micrometers, 150 micrometers, 200 micrometers, 240 micrometers, 280 micrometers, and 300 micrometers, etc. Those skilled in the art can determine the specific thickness according to the coating thickness, and no further limitations are made here.
[0055] An optional embodiment of the utility model, referring to... Figure 3 As shown, when there are at least two pairs of first ring portions 2, the two first ring portions 2 located between two adjacent coating extension regions 101 are an integral structure.
[0056] In this embodiment of the present invention, when there are at least two pairs of first ring portions 2, at least two coating extension regions 101 can be provided on the roller body 1. Considering that multiple sets of electrode sheets are rolled as a whole structure in the axial direction of the roller body 1, by making the two first ring portions 2 located between the coating extension regions 101 of two adjacent electrode coating areas 4 into a single structure, the connection gap between the two first ring portions 2 of the two adjacent coating extension regions 101 is reduced, thereby improving the utilization rate of the electrode sheet material. Specifically, it increases the width utilization rate of the electrode sheet material in the axial direction of the roller body 1 and reduces the processing cost of the flattening roller.
[0057] This utility model embodiment also discloses an electrode rolling device, which includes a support base and a flattening roller as described in any of the above utility model embodiments, wherein the flattening roller is rotatably connected to the support base.
[0058] This utility model embodiment also discloses an electrode processing equipment, which includes the electrode rolling device as described in the above utility model embodiment.
[0059] In summary, this utility model discloses a flattening roller, an electrode rolling device, and an electrode processing equipment. This utility model embodiment may include a roller body 1 and at least one pair of first ring portions 2. The at least one pair of first ring portions 2 are spaced apart along the axial direction of the roller body 1 to form a coating extension region 101 of the electrode coating area 4. The roller body 1 is integrally formed with the first ring portions 2 and is coaxial with the first ring portions 2. Furthermore, the surface of the first ring portions 2 forms a non-coating extension region 201 of the electrode non-coating area 5. Therefore, by integrally forming the first ring portions 2 on the roller body 1, the thickness difference between the electrode coating area 4 and the electrode non-coating area 5 can be compensated for, instead of using Teflon in the prior art. The integral forming design of the first ring portions 2 and the roller body 1 can reduce concentricity errors and improve the smoothness of the first ring portions 2 under long-term use, thereby preventing wrinkling of the electrode non-coating area 5 and improving the extension consistency of the electrode non-coating area 5.
[0060] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0061] It will be readily apparent to those skilled in the art that any combination of the above embodiments is feasible. Therefore, any combination of the above embodiments is an implementation scheme of this utility model. However, due to space limitations, this specification will not describe them in detail here.
[0062] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.
[0063] Similarly, it should be understood that, in order to simplify the present invention and aid in understanding one or more of the various aspects of the invention, in the description of exemplary embodiments of the present invention above, various features of the present invention are sometimes grouped together in a single embodiment, figure, or description thereof.
[0064] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of this invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.
Claims
1. A flattening roller characterized by, The flattening roller comprises a roller body (1) and at least one pair of first ring portions (2), the at least one pair of first ring portions (2) being spaced apart along the axial direction of the roller body (1) to form a coating propagation area (101) of a pole piece coating film area (4); wherein, The roller body (1) is integrally formed with the first ring portion (2) and coaxial with the first ring portion (2), and the surface of the first ring portion (2) forms a non-coating propagation area (201) of a pole piece non-coating film area (5).
2. The spreader roller of claim 1, wherein, A first texture groove (202) is arranged on the outer side of the first ring portion (2) away from the roller body (1).
3. The spreader bar of claim 2, wherein, The shape of the first texture groove (202) includes at least one of the following: a straight groove and a curved groove.
4. The spreader bar of claim 1, wherein, The flattening roller further comprises a second ring portion (3) located on the end face of the first ring portion (2) close to the coating propagation area (101); wherein, The second ring portion (3) is integrally formed with the roller body (1) and coaxial with the roller body (1), and the outer side of the second ring portion (3) away from the roller body (1) forms a ceramic propagation area (301) of a pole piece ceramic area (6).
5. The spreader roller of claim 4, wherein, The structure formed by the surface of the roller body (1), the second ring portion (3) and the first ring portion (2) is in the shape of a step in the axial direction of the roller body (1).
6. The spreader bar of claim 4, wherein, A first texture groove (202) is arranged on the outer side of the first ring portion (2) away from the roller body (1); and / or, A second texture groove (302) is arranged on the outer side of the second ring portion (3) away from the roller body (1).
7. The spreader bar of claim 1, wherein, The thickness of the first ring portion (2) in the radial direction is arranged to be between 50-300 microns.
8. The spreader bar of claim 1, wherein, In the case of at least two pairs of first ring portions (2), the two first ring portions (2) located between two adjacent coating propagation areas (101) are in an integral structure.
9. An electrode sheet rolling device characterized by comprising: The pole piece rolling device comprises a support seat and the flattening roller according to any one of claims 1-8, wherein the flattening roller is rotationally connected to the support seat.
10. A pole piece processing apparatus characterized by comprising: The pole piece processing equipment comprises the pole piece rolling device according to claim 9. The pole piece processing equipment comprises the pole piece rolling device according to claim 9.