Membrane material flattening roller, membrane material flattening mechanism and battery production equipment

Abstract

The utility model provides a membrane material flattening roll, membrane material flattening mechanism and battery production equipment, wherein the membrane material flattening roll comprises a base part and a roll part, the roll part covers the periphery of the base part, the roll surface of the roll part is provided with a plurality of concave first grains and second grains, the first grains and the second grains are arranged in a crossed manner, and the first grains and the second grains are arranged on the roll surface in a staggered manner. Any two adjacent first lines and any two adjacent second lines form a rhombic area in a surrounding mode. Each area comprises a first opposite angle and a second opposite angle, the extension length of the diagonal line of the first opposite angle on the roller surface is smaller than the extension length of the diagonal line of the second opposite angle on the roller surface, and the extension length of the second grain between two adjacent first grains on the roller surface is equal to the extension length of the diagonal line of the first opposite angle on the roller surface. According to the structural design, the acting force applied to the diaphragm by the roller part can be uniformly distributed, and the problem that the diaphragm is non-uniformly stretched due to non-uniform friction force in a local area of the roller part can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of batteries, specifically to a membrane flattening roller, a membrane flattening mechanism, and battery production equipment. Background Technology

[0002] In the production process of battery cells, the tight bonding between the separator and the positive and negative electrodes is one of the key steps to ensure battery performance and safety. A thermal bonding process is typically used to bond the separator to the electrodes to achieve effective cell isolation and lithium-ion conduction. However, before bonding, the separator surface may have wrinkles or unevenness. If wrinkles exist during the bonding process, they may be compressed into creases during thermal pressing, leading to uneven contact between the separator and the electrodes or localized failure. The presence of creases not only reduces the quality of the final battery cell but may also cause safety hazards such as internal short circuits and overheating. Therefore, ensuring that separator wrinkles and unevenness are resolved before the bonding process has become a pressing technical challenge in battery manufacturing. Utility Model Content

[0003] The present invention provides a membrane flattening roller, a membrane flattening mechanism, and a battery production equipment to solve the problem of wrinkles or unevenness in the separator before the composite process.

[0004] In a first aspect, embodiments of the present invention provide a film flattening roller, comprising: a base; and a roller portion covering the outer periphery of the base. The roller surface of the roller portion is provided with multiple recessed first and second grooves, the first and second grooves being intersected. On the roller surface, any two adjacent first grooves and any two adjacent second grooves form a rhomboid region. Each region includes a first diagonal and a second diagonal, the extension length of the diagonal of the first diagonal on the roller surface is less than the extension length of the diagonal of the second diagonal on the roller surface, and the extension length of the second groove between two adjacent first grooves on the roller surface is equal to the extension length of the diagonal of the first diagonal on the roller surface.

[0005] In one embodiment, the depth of the first texture and the second texture is 0.2 mm to 0.5 mm.

[0006] In one embodiment, the diagonal of the first diagonal extends in the axial direction of the film flattening roller on the roller surface, and the length of the diagonal extension on the roller surface is 3 mm to 10 mm.

[0007] In one embodiment, the film flattening roller satisfies the following condition: X = Y / 50 + 1; where X is the extension length of the diagonal of the first diagonal on the roller surface, and Y is the bonding length of the film material on the axial direction of the film flattening roller.

[0008] In one embodiment, the film flattening roller satisfies the following conditions: Z = 0.5X - 1, and 1mm ≤ Z ≤ 3mm; where X is the extension length of the diagonal of the first diagonal on the roller surface, and Z is the width of the first texture and the second texture.

[0009] In one embodiment, the film flattening roller satisfies the following condition: d = 40 * (X + Z); where d is the outer diameter of the roller.

[0010] Secondly, embodiments of the present invention provide a membrane flattening mechanism, which includes a plurality of membrane flattening rollers as described in the first aspect, wherein the plurality of membrane flattening rollers are arranged sequentially at intervals for the membrane to be wound around sequentially.

[0011] In one embodiment, the diagonal of the first diagonal extends along the roller surface in the axial direction of the film flattening roller, and the diagonal of the second diagonal extends along the roller surface in the circumferential direction of the film flattening roller.

[0012] In one embodiment, in two adjacent film flattening rollers in the film conveying direction, the orthographic projection of the diagonal of any pair of second opposite corners of one film flattening roller onto a plane parallel to the axial direction of the film flattening roller, and the orthographic projection of the diagonal of any pair of second opposite corners of the other film flattening roller onto a plane, do not overlap.

[0013] In one embodiment, the plurality of film flattening rollers include a first group of film flattening rollers and a second group of film flattening rollers according to their arrangement positions, wherein in a plane perpendicular to the axial direction of the film flattening rollers, the line connecting the axes of the individual film flattening rollers of the first group of film flattening rollers is parallel to the line connecting the axes of the individual film flattening rollers of the second group of film flattening rollers.

[0014] In one embodiment, in a plane perpendicular to the axial direction of the film flattening roller, the axis of each film flattening roller in the second group is located on the perpendicular bisector of the line connecting the axes of two corresponding film flattening rollers in the first group, and the included angle between the line connecting the axis of each film flattening roller in the second group to the axis of two corresponding film flattening rollers in the first group is greater than 60°.

[0015] Thirdly, embodiments of the present invention provide a battery production apparatus, which includes a film flattening mechanism as described in the second aspect.

[0016] This utility model provides a film flattening roller, a film flattening mechanism, and battery production equipment. The film flattening roller includes a base and a roller section, with the roller section covering the outer periphery of the base. The roller surface of the roller section has multiple recessed first and second grooves, which intersect. On the roller surface, any two adjacent first grooves and any two adjacent second grooves form a rhomboid region. Each region includes a first diagonal and a second diagonal. The extension length of the diagonal line of the first diagonal on the roller surface is less than the extension length of the diagonal line of the second diagonal on the roller surface. The extension length of the second groove between two adjacent first grooves on the roller surface is equal to the extension length of the diagonal line of the first diagonal on the roller surface. The membrane flattening roller provided by this utility model has a roller section with a combination design of multiple first textures and multiple second textures. When it comes into contact with the membrane material, the texture structure and the area enclosed by the textures can generate a large friction force on the membrane material. This friction force enables the membrane material to be evenly flattened when passing through the roller surface of the roller section, thereby avoiding the problem of wrinkles or unevenness of the membrane material during the transmission process. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the film flattening roller provided in this embodiment of the utility model;

[0019] Figure 2 yes Figure 1 Front view of the film spreading roller;

[0020] Figure 3 yes Figure 2 Enlarged view of section A;

[0021] Figure 4 This is a schematic diagram of the membrane flattening mechanism provided in an embodiment of the present invention;

[0022] Figure 5 yes Figure 4 Top view of the membrane material flattening mechanism;

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

[0024] 100. Membrane flattening roller; 110. Base; 120. Roller section; 130. First texture; 140. Second texture; 150. Area; 160. First diagonal; 170. Second diagonal; 200. Membrane flattening mechanism; 210. First group of membrane flattening rollers; 220. Second group of membrane flattening rollers. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0026] To address the issue of wrinkles or unevenness in the diaphragm before the lamination process, this invention provides a membrane flattening roller 100, please refer to [reference needed]. Figures 1 to 3 , Figure 1 This is a schematic diagram of the structure of the film flattening roller 100 provided in this embodiment of the utility model. Figure 2 yes Figure 1 Front view of the medium-sized film spreading roller 100. Figure 3 yes Figure 2 Enlarged view of section A.

[0027] Specifically, the film flattening roller 100 includes a base 110 and a roller 120. The roller 120 covers the outer periphery of the base 110 and is configured to contact the film material. The film flattening roller 100 is rotated by a motor or other driving method, so that the friction of the roller 120 surface causes the film material to move in the tangential direction of the contact surface. The roller surface of the roller 120 is provided with multiple recessed first grooves 130 and second grooves 140. The first grooves 130 and second grooves 140 are intersecting. On the roller surface, any two adjacent first grooves 130 and any two adjacent second grooves 140 form a rhomboid region 150. Specifically, when the bent roller surface is flattened into a plane, the region formed by any two adjacent first grooves 130 and any two adjacent second grooves 140 is rhomboid. Each region 150 includes two pairs of diagonals, namely the first diagonal 160 and the second diagonal 170. The extension length X of the diagonal line of the first diagonal 160 on the roller surface is less than the extension length of the diagonal line of the second diagonal 170 on the roller surface. The extension length H of the second texture 140 between two adjacent first textures 130 on the roller surface is equal to the extension length X of the diagonal line of the first diagonal 160 on the roller surface.

[0028] In the film flattening roller 100 provided in this embodiment, the roller portion 120 is designed with a combination of multiple first textures 130 and multiple second textures 140, so that when it comes into contact with the film material, the texture structure and the area 150 enclosed by the textures can generate a large frictional force on the film material. This frictional force allows the film material to be evenly flattened when passing through the roller surface, thereby avoiding the problem of wrinkles or unevenness of the film material during the transmission process.

[0029] Furthermore, to further optimize the flattening effect of the film material, this embodiment also features a special design for the dimensional relationship between the first texture 130 and the second texture 140. Specifically, on the arc surface of the roller 120, the extension length H of the second texture 140 between two adjacent first textures 130 on the roller surface is set to be equal to the extension length X of the diagonal of the first diagonal 160 on the roller surface. This ensures that after the circumferential surface of the roller surface is extended into a plane, the diagonal of the first diagonal 160 divides the region 150 into two equilateral triangle regions. This structural design ensures that the regions 150 between the textures are arranged more regularly, which helps to evenly distribute the force applied by the roller 120 to the film material. It avoids the problem of uneven film stretching caused by uneven friction in local areas 150 of the roller 120, thereby enabling the film material to be flattened more smoothly when passing through the roller 120, ensuring that its surface is stretched evenly, and effectively preventing wrinkles from forming on the film material.

[0030] In some embodiments, the depths of the first texture 130 and the second texture 140 are set between 0.2 mm and 0.5 mm. Specifically, when the depth of the first texture 130 and / or the second texture 140 is less than 0.2 mm, the friction between the roller 120 and the film material is insufficient, thus failing to effectively generate sufficient traction and stretching force on the film material. Therefore, the film material may not be able to flatten sufficiently when passing through the roller surface, thereby affecting its surface flatness and the quality of subsequent processes. On the other hand, when the depth of the first texture 130 and / or the second texture 140 is greater than 0.5 mm, it may cause the film material to leave deeper marks on its surface when passing through the roller surface, thereby affecting the film material's performance in subsequent processes.

[0031] Therefore, by controlling the depth of the first texture 130 and the second texture 140 to between 0.2mm and 0.5mm, the magnitude of friction can be effectively balanced, so that the film material can be evenly flattened when passing through the roller surface, while avoiding deep imprints from the film material flattening roller 100 when the film material passes through the roller surface, thus ensuring the reliability of the film material in subsequent processing.

[0032] In some embodiments, please refer to Figure 3The diagonal of the first diagonal 160 extends along the axial direction of the film flattening roller 100 on the roller surface, and the extension length X of the diagonal of the first diagonal 160 on the roller surface is set between 3 mm and 10 mm. This size range is chosen to ensure that the film material can achieve the best flattening effect when passing through the roller surface.

[0033] Specifically, on the one hand, if the extension length X of the diagonal of the first diagonal 160 on the roller surface is less than 3 mm, the membrane material may be subjected to greater pressure when passing over the roller surface. This greater pressure may cause obvious marks on the surface of the membrane material, resulting in poor performance of the membrane material in subsequent processes. On the other hand, since the contact area between the membrane material and the roller 120 is small during the transport process, if the extension length X of the diagonal of the first diagonal 160 on the roller surface is greater than 10 mm, the force distribution of the membrane flattening roller 100 may be uneven, which may prevent the membrane material from being fully stretched and flattened, thus affecting the quality of the membrane material in subsequent processing.

[0034] Therefore, by controlling the extension length X of the first diagonal 160 on the roller surface to be between 3mm and 10mm, the pressure of the film flattening roller 100 on the film material and the flattening effect of the film material can be effectively balanced, so that the film material is subjected to appropriate pressure when passing through the roller surface without producing marks, and at the same time, the problem of insufficient flattening of the film material is avoided.

[0035] In some embodiments, to ensure that the film flattening roller 100 can uniformly flatten film materials of different widths, the extension length X of the diagonal of the first diagonal 160 on the roller surface is adaptively adjusted. Specifically, the film flattening roller 100 satisfies the following condition: X = Y / 50 + 1. Wherein, X is the extension length of the diagonal of the first diagonal 160 on the roller surface, and Y is the bonding length of the film material in the axial direction of the film flattening roller 100.

[0036] This design condition is the optimal solution obtained through extensive experimental verification. When the extension length X of the diagonal of the first diagonal 160 on the roller surface and the bonding length of the film material on the axial direction of the film flattening roller 100 conform to the above formula, the flattening effect of the film material is better. Through this adaptive adjustment, different specifications of roller section 120 structures can be used to flatten the film material according to the different bonding lengths on the axial direction of the film flattening roller 100, ensuring that film materials of different specifications can achieve better flattening effects. It should be noted that in this embodiment, the diagonal of the first diagonal 160 is parallel to the axis of the film flattening roller 100.

[0037] Furthermore, if the same specification of film flattening roller 100 is used to process film materials of different specifications, uneven flattening often occurs, which may even lead to irregular wrinkles or stress deformation on the film surface, affecting product quality. By adopting the above-mentioned adaptive adjustment method, this problem can be effectively avoided.

[0038] Furthermore, to ensure the flattening effect of the film material flattening roller 100 on the film material, in some embodiments, the widths of the first texture 130 and the second texture 140, and the extension length X of the diagonal of the first diagonal 160 on the roller surface have been adaptively adjusted. Please refer to [reference needed]. Figure 1 , Figure 3 Specifically, the film flattening roller 100 satisfies the following conditions: Z = 0.5X - 1, and 1mm ≤ Z ≤ 3mm; where X is the extension length X of the diagonal of the first diagonal 160 on the roller surface, and Z is the width of the first texture 130 and the second texture 140.

[0039] To ensure the ease of processing of the first texture 130 and the second texture 140, the width Z of the first texture 130 and the second texture 140 is usually designed to be greater than 1 mm. However, to avoid the first texture 130 and the second texture 140 being too wide and causing the film material to be unable to be effectively flattened, the width Z of the first texture 130 and the second texture 140 is usually designed to be less than 3 mm. For example, when X is 4 mm, Z equals 1 mm, and when X is 8 mm, Z equals 3 mm. When X is less than 4 mm, Z is set to 1 mm, and when X is greater than 4 mm, Z is set to 3 mm.

[0040] The above design conditions are the optimal solution obtained through extensive experimental verification. When the width of the first texture 130 and the second texture 140 and the extension length X of the diagonal of the first diagonal 160 on the roller surface conform to the above formula, the flattening effect of the film material is better. Through the above adaptive adjustment, the film material can be flattened using roller section 120 structures of different specifications according to the different bonding lengths of the film material on the film material flattening roller 100 in the axial direction, so as to ensure that film materials of different specifications can obtain better flattening effects.

[0041] This utility model provides a film flattening roller 100, which includes a base 110 and a roller 120. The roller 120 covers the outer periphery of the base 110. The roller surface of the roller 120 is provided with multiple recessed first textures 130 and second textures 140. The first textures 130 and second textures 140 are intersecting and arranged so that after the circumferential surface of the roller surface is extended into a plane, any two adjacent first textures 130 and any two adjacent second textures 140 form a rhomboid region 150. Each region 150 includes a first diagonal 160 and a second diagonal 170. The extension length X of the diagonal line of the first diagonal 160 on the roller surface is less than the extension length of the diagonal line of the second diagonal 170 on the roller surface. The extension length H of the second texture 140 between two adjacent first textures 130 on the roller surface is equal to the extension length X of the diagonal line of the first diagonal 160 on the roller surface. The roller 120 is designed with a combination of multiple first textures 130 and multiple second textures 140, so that when it comes into contact with the film material, the texture structure and the area 150 enclosed by the textures can generate a large friction force on the film material. This friction force allows the film material to be evenly flattened when passing through the roller surface, thereby avoiding the problem of wrinkles or unevenness of the film material during the transmission process.

[0042] Furthermore, the extension length of the second ridge 140 between two adjacent first ridges 130 on the roller surface is set to be equal to the extension length of the diagonal of the first ridge 130 on the roller surface. This structural design ensures that the areas 150 between the ridges are arranged more regularly, which helps to evenly distribute the force applied to the film material by the roller 120. It can avoid the problem of uneven film stretching caused by uneven friction in local areas 150 of the roller 120, thereby enabling the film material to be flattened more smoothly when passing through the roller 120, ensuring that its surface is stretched evenly, and thus effectively avoiding the problem of wrinkles in the film material.

[0043] To ensure that the film flattening roller 100 can produce a good flattening effect for film materials of different widths, in some embodiments, the extension length of the outer diameter of the roller portion 120 and the diagonal of the first diagonal 160 on the roller surface of the roller portion 120, as well as the width of the first texture 130 and the second texture 140, have been adaptively adjusted. Please refer to [reference needed]. Figure 3 Specifically, the film flattening roller 100 satisfies the following condition: d = 40 * (X + Z). Wherein, d is the outer diameter of the roller section 120, X is the extension length of the diagonal of the first diagonal 160 on the roller surface of the roller section 120, and Z is the width of the first texture 130 and the second texture 140.

[0044] The above design conditions are the optimal solution obtained through a large number of experiments. When the outer diameter of the roller 120, the extension length of the diagonal of the first diagonal 160 on the roller surface of the roller 120, and the width of the first texture 130 and the second texture 140 meet the above formula, the outer diameter of the roller 120 increases with the increase of the width of the film material. As a result, the film flattening roller 100 can provide greater dispersion force for wider film materials, thereby ensuring that film materials of different specifications can obtain better flattening effect.

[0045] This utility model also provides a membrane flattening mechanism 200, please refer to... Figure 3 , Figure 4 , Figure 4 This is a schematic diagram of the structure of the membrane flattening mechanism 200 provided in this embodiment of the utility model. The membrane flattening mechanism 200 includes a plurality of membrane flattening rollers 100, which are arranged sequentially at intervals for the membrane material to be wound around sequentially. By having the membrane material wound around the plurality of membrane flattening rollers 100 sequentially, the tensile force of the membrane material driven by the membrane flattening rollers 100 can be dispersed, thereby reducing the risk of wrinkles caused by the membrane material being stretched.

[0046] It should be noted that in some embodiments provided by this utility model, the extension direction of the first diagonal line on the roller surface is the axial direction of the film flattening roller, and the extension direction of the second diagonal line on the roller surface is the circumferential direction of the film flattening roller.

[0047] In some embodiments, in two adjacent film flattening rollers 100 in the film conveying direction, the orthographic projection of the diagonal of any pair of second diagonals 170 in one film flattening roller 100 onto a plane parallel to the axial direction of the film flattening roller 210 does not overlap with the orthographic projection of the diagonal of any pair of second diagonals 170 in the other film flattening roller 100 onto a plane. It should be noted that in this embodiment, the orthographic projection of the diagonal of the second diagonal 170 onto a plane parallel to the axial direction of the first set of film flattening rollers 210 is perpendicular to the axis of the film flattening roller 100.

[0048] Specifically, if the orthographic projection of the diagonal of any pair of second diagonals 170 in one film flattening roller 100 onto a plane parallel to the axial direction of the first set of film flattening rollers 210 overlaps with the orthographic projection of the diagonal of any pair of second diagonals 170 in another film flattening roller 100 onto the same plane, the film is more easily guided by the texture when the film flattening mechanism 200 continuously conveys the film, thus causing the conveying direction of the film to deviate. Through the structural design in this embodiment, the problems of film deviation and wrinkles caused by tension or pulling when the film passes between adjacent film flattening rollers 100 in the conveying direction can be avoided.

[0049] To optimize the conveying effect of the membrane material, please refer to some embodiments. Figure 5, Figure 5 yes Figure 4 A top view of the membrane flattening mechanism 200 shows that the multiple membrane flattening rollers 100 are arranged in a first group of membrane flattening rollers 210 and a second group of membrane flattening rollers 220. In a plane perpendicular to the axial direction of the membrane flattening rollers 100, the line connecting the axes of the membrane flattening rollers 100 in the first group of membrane flattening rollers 210 is parallel to the line connecting the axes of the membrane flattening rollers 100 in the second group of membrane flattening rollers 220.

[0050] Specifically, the axis connecting the first set of membrane flattening rollers 210 and the second set of membrane flattening rollers 220 is arranged in parallel. This parallel layout ensures that the membrane material can maintain good tension and uniform flattening force when passing through the two sets of membrane flattening rollers 100. At the same time, it can effectively avoid the problems of misalignment, skewing or uneven tension distribution of the membrane material during the conveying process, making the conveying process of the membrane material between the flattening rollers more stable and uniform, thereby ensuring the flattening effect of the membrane material.

[0051] In some embodiments, please refer to Figure 5 In a plane perpendicular to the axial direction of the film flattening roller 100, the axis of each film flattening roller 100 in the second group of film flattening rollers 220 is located on the perpendicular bisector of the line connecting the axes of the corresponding two film flattening rollers 100 in the first group of film flattening rollers 210. Furthermore, the included angle α between the lines connecting the axes of each film flattening roller 100 in the second group of film flattening rollers 220 and the axes of the corresponding two film flattening rollers 100 in the first group of film flattening rollers 210 is greater than 60°.

[0052] Specifically, in this embodiment, the included angle α between the axis of each of the second group of film flattening rollers 220 and the line connecting the axis of the corresponding two film flattening rollers 100 in the first group of film flattening rollers 210 is designed to be greater than 60°. This ensures a smooth transition of the film material during transport and effectively reduces the risk of bending or deformation. The larger included angle design allows the film material to experience a more uniform distribution of tension and flattening force when passing through the two groups of flattening rollers, thereby avoiding excessive bending, tearing, or twisting of the film material during flattening. When the film material passes through the flattening rollers, the direction of force is more reasonable and uniform, thereby reducing the risk of surface damage or internal stress concentration caused by excessive local force.

[0053] This utility model also provides a battery production equipment, which includes the above-mentioned film flattening mechanism 200 and has all the advantages of the above-mentioned film flattening mechanism 200, which will not be repeated here.

[0054] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A film flattening roller, characterized in that, include: Base; and The roller portion covers the outer periphery of the base portion. The roller surface of the roller portion is provided with multiple recessed first and second grooves. The first grooves and the second grooves are intersected. On the roller surface, any two adjacent first grooves and any two adjacent second grooves form a rhomboid area. Each of the regions includes a first diagonal and a second diagonal, wherein the length of the diagonal line of the first diagonal on the roller surface is less than the length of the diagonal line of the second diagonal on the roller surface; the length of the second pattern between two adjacent first patterns on the roller surface is equal to the length of the diagonal line of the first diagonal on the roller surface.

2. The film flattening roller according to claim 1, characterized in that, The depth of the first texture and the second texture is 0.2 mm to 0.5 mm.

3. The film flattening roller according to claim 1, characterized in that, The diagonal of the first diagonal extends in the axial direction of the film flattening roller on the roller surface, and the length of the diagonal on the roller surface is 3mm to 10mm.

4. The film flattening roller according to claim 3, characterized in that, The film flattening roller satisfies the following condition: X = Y / 50 + 1; where X is the extension length of the diagonal of the first diagonal on the roller surface, and Y is the bonding length of the film material on the axial direction of the film flattening roller.

5. The film flattening roller according to claim 3, characterized in that, The film flattening roller satisfies the following conditions: Z = 0.5X - 1, and 1mm ≤ Z ≤ 3mm; where X is the extension length of the diagonal of the first diagonal on the roller surface, and Z is the width of the first texture and the second texture.

6. The film flattening roller according to claim 5, characterized in that, The film flattening roller satisfies the following condition: d = 40*(X+Z); where d is the outer diameter of the roller.

7. A membrane material flattening mechanism, characterized in that, It includes multiple membrane flattening rollers as described in any one of claims 1-6, wherein the multiple membrane flattening rollers are arranged at intervals in sequence for the membrane to be wound around in sequence.

8. The membrane flattening mechanism according to claim 7, characterized in that, The diagonal of the first diagonal extends along the axial direction of the film flattening roller on the roller surface, and the diagonal of the second diagonal extends along the circumferential direction of the film flattening roller on the roller surface.

9. The membrane flattening mechanism according to claim 8, characterized in that, In two adjacent film flattening rollers in the conveying direction of the film material, the orthographic projection of the diagonal of any pair of the second diagonals of one film flattening roller onto a plane parallel to the axial direction of the film flattening roller, and the orthographic projection of the diagonal of any pair of the second diagonals of the other film flattening roller onto the same plane, do not overlap.

10. The membrane flattening mechanism according to claim 7, characterized in that, The plurality of film flattening rollers are arranged in a first group and a second group according to their positions. In a plane perpendicular to the axial direction of the film flattening rollers, the line connecting the axes of the individual film flattening rollers in the first group and the line connecting the axes of the individual film flattening rollers in the second group are parallel to each other.

11. The membrane flattening mechanism according to claim 10, characterized in that, In a plane perpendicular to the axial direction of the film flattening roller, the axis of each of the second group of film flattening rollers is located on the perpendicular bisector of the line connecting the axes of two corresponding film flattening rollers in the first group of film flattening rollers, and the angle between the line connecting the axis of each of the second group of film flattening rollers and the axis of the corresponding two film flattening rollers in the first group of film flattening rollers is greater than 60°.

12. A battery manufacturing apparatus, characterized in that, Includes the membrane flattening mechanism as described in any one of claims 7-11.

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