Extension mechanism and pole piece processing apparatus

Abstract

An extension mechanism (100) and a pole piece processing device (1000), the pole piece processing device (1000) comprising the extension mechanism (100). The extension mechanism (100) comprises a roller (10), and a first groove (101) is arranged around the outer circumferential surface of the roller (10). The outer circumferential surface of the roller (10) is used to pass through a to-be-extended part provided with a to-be-extended area, so that the to-be-extended area is opposite to the first groove (101); wherein the extension mechanism (100) is configured to be capable of moving the to-be-extended area towards the first groove (101). By arranging the first groove (101) on the outer circumferential surface of the roller (10), and the extension mechanism (100) being capable of moving the to-be-extended area towards the first groove (101), the extension of the to-be-extended area can be realized, thereby the problem of poor flatness of the to-be-extended part can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pole piece processing, in particular to a stretching mechanism and a pole piece processing device. BACKGROUND

[0002] In the processing process of the pole piece, a coating operation is usually performed on the surface of the current collector to form a pole piece, and then a rolling operation is performed on the pole piece. The pole piece includes a coated area subjected to the coating operation and a blank area not subjected to the coating operation.

[0003] In some cases, during the rolling operation, the coated area of the pole piece is rolled to be stretched to a certain extent, while the blank area is not rolled and thus not stretched. In this way, there is a large difference in stretching between the coated area and the blank area of the pole piece, resulting in poor flatness of the pole piece. SUMMARY

[0004] In view of the above problems, the purpose of the embodiments of the present application is to provide a stretching mechanism and a pole piece processing device, which can improve the technical problem of unevenness caused by the difference in stretching of the pole piece.

[0005] The technical solution adopted by the embodiments of the present application is:

[0006] In a first aspect, the embodiments of the present application provide a stretching mechanism, comprising:

[0007] a roller, a first groove is arranged around the outer periphery of the roller, and the outer periphery of the roller is used to pass around a to-be-stretched member provided with a to-be-stretched area, so that the to-be-stretched area is directly opposite the first groove;

[0008] The stretching mechanism is configured to enable the to-be-stretched area to move towards the first groove.

[0009] The stretching mechanism provided by the embodiments of the present application is provided with the first groove on the outer periphery of the roller, and the stretching mechanism can enable the to-be-stretched area directly opposite the first groove to move towards the first groove. When the to-be-stretched member passes around the outer periphery of the roller, the to-be-stretched area of the to-be-stretched member can be directly opposite the first groove. By enabling the to-be-stretched area directly opposite the first groove to move towards the first groove through the stretching mechanism, the to-be-stretched area can be stretched towards the first groove. In this way, the problem of poor flatness of the to-be-stretched member can be improved.

[0010] In some embodiments, the stretching mechanism further comprises a blowing device, and the blowing device comprises a blow nozzle; the blow nozzle is directly opposite the first groove and is used to blow air towards the first groove to blow the to-be-stretched area into the first groove.

[0011] By adopting the technical scheme, when the to-be-expanded piece passes around the outer circumferential surface of the roller piece, the to-be-expanded region of the to-be-expanded piece can be opposite to the first groove. By blowing air from the tuyere towards the first groove, the to-be-expanded region of the to-be-expanded piece can be blown into the first groove, so that the to-be-expanded region can be expanded towards the first groove. In this way, the to-be-expanded region can be expanded by the blowing and expanding device, so that the problem of poor flatness of the to-be-expanded piece can be improved.

[0012] In some embodiments, the blowing and expanding device further comprises a first heating piece opposite to the first groove to heat the to-be-expanded region.

[0013] By adopting the technical scheme, when the pole piece passes around the outer circumferential surface of the roller piece so that the blank region of the pole piece is opposite to the first groove, the first heating piece can heat the blank region to soften the blank region. In this way, the blank region is more easily bent and expanded into the first groove under the blowing action of the tuyere, which is beneficial to the expansion effect of the blank region.

[0014] In some embodiments, the first heating piece and the tuyere are spaced apart along the circumferential direction of the roller piece.

[0015] By adopting the technical scheme, each segment of the blank region of the pole piece in the movement direction can be subjected to the heating action of the first heating piece and the blowing action of the tuyere, so that each segment of the blank region in the movement direction can be bent and expanded towards the first groove to achieve the expansion effect. Based on this, the expansion effect of the blank region can be improved.

[0016] In some embodiments, the tuyere and the first heating piece are each arranged in multiple groups, and each group of the first heating piece and each group of the tuyere are alternately arranged along the circumferential direction of the roller piece.

[0017] By adopting the technical scheme, the multiple groups of the first heating piece can sequentially heat the blank region step by step, and the multiple groups of the tuyere can blow air to the blank region after each heating, so that the blank region can be sequentially and progressively blown into the first groove to sequentially and progressively expand the blank region. In this way, the problem of over-heating and fracture of the blank region caused by the first heating piece can be improved.

[0018] In some embodiments, along the circumferential direction of the roller piece, the tuyere and the first heating piece are respectively arranged at two ends of the blowing and expanding device.

[0019] By adopting the technical scheme, the blank region can be better heated and softened, and blown into the first groove by the tuyere, so that the expansion effect of the blank region can be better achieved.

[0020] In some embodiments, the first heating piece and the tuyere are spaced apart along the axial direction of the roller piece.

[0021] By adopting the technical scheme, the first heating member and the air nozzle are used to perform corresponding actions on different positions of each section of the blank area along the width direction, so that the effect of bending and extending each section of the blank area towards the first groove can be achieved.

[0022] In some embodiments, in the axial direction of the roller, the first heating member is arranged at both ends of the air nozzle.

[0023] By adopting the technical scheme, the connecting position between the blank area and the coating area can be heated and softened under the heating action of the first heating member, so as to facilitate the bending and extension of the blank area towards the first groove.

[0024] In some embodiments, in the axial direction of the roller, the size of the first heating member is less than or equal to the size of the first groove.

[0025] By adopting the technical scheme, the first heating member will not exceed the first groove in the axial direction of the roller, so that the problem of heating the coating area of the pole piece can be improved.

[0026] In some embodiments, in the cross section of the extension mechanism perpendicular to the axial direction of the roller, the first heating member and the air nozzle are jointly arranged within half of the circumference of the first groove.

[0027] By adopting the technical scheme, the use of the first heating member and the air nozzle can be saved.

[0028] In some embodiments, the air nozzle is arranged in multiple groups, and the multiple groups of air nozzles are distributed along the circumferential direction of the roller; one group of air nozzles includes multiple air nozzles, and at least part of the air nozzles are sequentially distributed along the axial direction of the roller.

[0029] By adopting the technical scheme, when each section of the blank area passes through a group of air nozzles along the movement direction, the group of air nozzles can realize the blowing action on multiple positions of each section of the blank area along the width direction, so that the blank area can be effectively blown into the first groove to achieve the extension effect of the blank area.

[0030] In some embodiments, the air nozzle is arranged in multiple groups, and the multiple groups of air nozzles are distributed along the circumferential direction of the roller; one group of air nozzles includes multiple air nozzles, and at least part of the air nozzles are sequentially distributed along the circumferential direction of the roller.

[0031] By adopting the technical scheme, when each section of the blank area passes through a group of air nozzles along the movement direction, the group of air nozzles can realize the blowing action on multiple positions of each section of the blank area along the length direction, so that the blank area can be effectively blown into the first groove to achieve the extension effect of the blank area.

[0032] In some embodiments, the inflation device further comprises a first connecting member, the first connecting member is distributed in the roller, and the air nozzle is arranged on the first connecting member.

[0033] By adopting the technical scheme, the air nozzles can maintain the relative position relationship between the air nozzles and the first grooves, and further maintain the opposite relationship and the distance between the air nozzles and the first grooves, so that the air nozzles can effectively blow the blank areas in the first grooves.

[0034] In some embodiments, the first connecting member is provided with a second groove opposite to the first groove, and a part of the roller member is arranged in the second groove, so that the first connecting member is arranged around the first groove; and the air nozzle is arranged in the second groove.

[0035] By adopting the technical scheme, the air nozzles can maintain the relative position relationship between the air nozzles and the first grooves, and further maintain the opposite relationship and the distance between the air nozzles and the first grooves, so that the air nozzles can effectively blow the blank areas in the first grooves.

[0036] In some embodiments, the number of the first grooves and the number of the inflation devices are both plural, and the plural first grooves are arranged in the axial direction of the roller member; each inflation device is arranged corresponding to each first groove, and the air nozzle of each inflation device is opposite to the corresponding first groove.

[0037] By adopting the technical scheme, when the pole piece has plural blank areas and the pole piece passes around the outer circumferential surface of the roller member, the width direction of the pole piece can be parallel to the axial direction of the roller member, and the plural blank areas can be one-to-one corresponding to the plural first grooves. In this way, the air nozzle of each inflation device can blow the corresponding blank area into the corresponding first groove, so that the extension of the plural blank areas can be realized.

[0038] In some embodiments, the inflation device further comprises a first connecting member, and the air nozzle is arranged on the first connecting member.

[0039] The extension mechanism further comprises a second connecting member, the first connecting members of the plural inflation devices are connected to the second connecting member, and the first connecting members can move relative to the second connecting member to adjust the positions of the first connecting members in the axial direction of the roller member.

[0040] By adopting the technical scheme, the positions of the plural inflation devices in the axial direction of the roller member can be adjusted, so that the plural inflation devices can be one-to-one corresponding to the plural blank areas, and the application range of the extension mechanism can be expanded.

[0041] In some embodiments, the groove wall of the first groove is provided with an adsorption hole penetrating through the groove wall, and the adsorption hole is used for adsorbing the to-be-extended area.

[0042] By adopting the technical scheme, the blank area of the pole piece can be adsorbed to the first groove and moved towards the first groove, so as to realize the extension of the blank area. Compared with the scheme of arranging the inflation device outside the roller, the overall volume of the extension mechanism can be reduced.

[0043] In some embodiments, the extension mechanism further comprises a second heating member arranged on the roller, and the second heating member is configured to heat the roller to adjust the depth of the first groove.

[0044] By adopting the technical scheme, the depth of the first groove is adjusted by heating the roller by the second heating member, so that the extension rate of the blank area can be adjusted, which can make the extension rate of the blank area as close as possible to the extension rate of the coated area, thereby reducing the extension difference between the blank area and the coated area and improving the flatness of the pole piece.

[0045] In some embodiments, the roller comprises:

[0046] a plurality of roller segments arranged at intervals along the axial direction;

[0047] a deformable member in the shape of a ring, two ends of the deformable member along the axial direction are connected to two adjacent roller segments, respectively, a first groove is arranged on an outer circumferential surface of the deformable member, or the first groove is formed by the outer circumferential surface of the deformable member and the two adjacent roller segments, and a second heating member is arranged on the inner side of the deformable member and configured to heat the deformable member.

[0048] By adopting the technical scheme, the second heating member is arranged on the inner side of the deformable member, so that the deformable member can be deformed by heat when the second heating member is heated, so as to change the depth of the first groove and adjust the extension rate of the blank area.

[0049] In some embodiments, the second heating member is arranged on the inner circumferential surface of the deformable member.

[0050] By adopting the technical scheme, the heat generated by the second heating member can be quickly transferred to the deformable member, so as to adjust the extension rate of the blank area in real time and quickly, which helps to improve the flatness of the pole piece.

[0051] In some embodiments, the inner circumferential surface of the deformable member is connected to a heat insulation member, the heat insulation member and the deformable member form an accommodation space, and the second heating member is arranged in the accommodation space.

[0052] By adopting the technical scheme, on one hand, the problem that the heat generated by the second heating member is transmitted to the roller segment to cause the coating area of the pole piece to be heated and stretched can be improved, and in turn, the difference in stretching between the coating area and the blank area can be reduced. On the other hand, the second heating member can maintain the positional relationship with the deformable member under the limiting action of the heat insulation member, so that the second heating member can reliably heat the deformable member to adjust the depth of the first groove.

[0053] In some embodiments, the roller member further comprises a third connecting member connected to the two adjacent roller segments, the deformable member is arranged outside the third connecting member, and a containing groove is formed between the third connecting member and the deformable member, and the second heating member is arranged in the containing groove.

[0054] By adopting the technical scheme, the operation of arranging the second heating member in the roller member is relatively simple. Moreover, the containing groove containing the second heating member is formed between the third connecting member and the deformable member, so that the second heating member can be fixed to a certain extent, and the heating effect of the second heating member on the deformable member can be maintained.

[0055] In some embodiments, the roller surface of the roller member and the groove wall of the first groove are circularly transitioned.

[0056] By adopting the technical scheme, the problem that the connection between the roller surface of the roller member and the groove wall of the first groove maintains the piercing of the pole piece can be improved, and in turn, the pole piece can be protected.

[0057] In a second aspect, the embodiments of the present application provide a pole piece processing equipment, comprising a stretching mechanism, the stretching mechanism is used for stretching the pole piece.

[0058] The pole piece processing equipment provided by the embodiments of the present application can also make the blank area produce stretching towards the first groove under the blowing action of the blowing device, so that the difference in stretching between the blank area and the coating area can be reduced, and in turn, the problem of poor flatness of the pole piece can be improved. Moreover, compared with the scheme of arranging the annular boss, the embodiments of the present application can also reduce the radial force received by the blank area, so that the problem that the blank area is prone to breaking during stretching can be improved, and thus the quality of the pole piece can be improved.

[0059] In some embodiments, the pole piece processing equipment further comprises a rolling mechanism, the rolling mechanism is used for rolling the pole piece, and the stretching mechanism is used for stretching the pole piece after rolling.

[0060] By adopting the technical scheme, the rolling mechanism and the stretching mechanism respectively realize the stretching of the coating area and the blank area of the pole piece, so that the pole piece has better flatness.

[0061] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following will specifically describe the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0062] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or exemplary technical descriptions. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0063] Figure 1 A schematic diagram of an electrode sheet in the related art;

[0064] Figure 2 A schematic diagram of electrode sheet rolling in the related art;

[0065] Figure 3 A schematic diagram of an electrode sheet cooperating with an extension mechanism provided by some embodiments of the present application;

[0066] Figure 4 A schematic diagram of an electrode sheet cooperating with an extension mechanism provided by some embodiments of the present application; Figure 3 A sectional view along A-A;

[0067] Figure 5 A schematic diagram of an electrode sheet cooperating with an extension mechanism provided by some embodiments of the present application; Figure 3 An expanded sectional view along B-B;

[0068] Figure 6 An expanded sectional view of a blowing device of an extension mechanism provided by another embodiment of the present application;

[0069] Figure 7 A partial schematic diagram of a roller provided by some embodiments of the present application;

[0070] Figure 8 A partial schematic diagram of a roller provided by some embodiments of the present application; Figure 3 A partial schematic diagram of a roller provided by some embodiments of the present application;

[0071] Figure 9 A partial schematic diagram of a roller provided by some embodiments of the present application;

[0072] Figure 10 A schematic diagram of an electrode sheet cooperating with an electrode sheet processing device provided by some embodiments of the present application.

[0073] In the drawings, various reference signs represent:

[0074] 1000 - pole piece processing equipment; 100 - extension mechanism; 200 - rolling mechanism; 210 - compression roller; 10 - roller piece; 101 - first groove; 102 - containing space; 103 - containing groove; 104 - adsorption hole; 11 - roller section; 12 - deformable piece; 13 - third connecting piece; 20 - inflation device; 21 - air nozzle; 22 - first heating piece; 23 - first connecting piece; 2301 - second groove; 30 - second heating piece; 40 - heat insulation piece; L - central axis; M - pole piece; M1 - coating area; M2 - blank area. DETAILED DESCRIPTION

[0075] Embodiments of the present application are described below in detail with reference to examples thereof illustrated in the accompanying drawings, in which like or similar elements or components are denoted throughout by like reference numerals, and of which the embodiments described below are illustrative only and not intended to limit the present application.

[0076] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0077] In addition, the terms "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features.

[0078] In the description of the present application, the meaning of "a plurality of" is two or more, and "two or more" includes two, unless otherwise explicitly specified and limited. Accordingly, the meaning of "a plurality of groups" is two or more groups, including two groups.

[0079] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing", etc. should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0080] In the description of the present application, the term "and / or", merely describes an association relationship of associated objects, indicates that there can be three relationships, for example, A and / or B, which can represent the three cases of existence of A, existence of A and B, and existence of B. In addition, in the present application, the character " / ", generally represents that the front and rear associated objects are a "or" relationship.

[0081] In the related art, the processing procedure of the pole piece is generally as follows: first, active substances, binders, conductive agents and the like are mixed according to a certain proportion to prepare a slurry, then the slurry is uniformly coated on the surface of the current collector, and the pole piece is formed after baking. Then, the pole piece is subjected to a rolling operation to roll the pole piece to a specified thickness.

[0082] In order to facilitate subsequent slitting, tab forming and other operations of the pole piece, the slurry is only coated on the surface of part of the area of the current collector, and the surface of another part of the area of the current collector is not coated with the slurry. For ease of description, the pole piece is divided into a coated area and a blank area, the coated area of the pole piece is coated with the slurry, and the blank area of the pole piece is not coated with the slurry. It can be understood that the thickness of the coated area of the pole piece is greater than the thickness of the blank area.

[0083] During the rolling operation, the coated area of the pole piece is rolled and stretched to a certain extent, while the blank area is not rolled and stretched. In this way, the coated area and the blank area of the pole piece differ in stretching, which is easy to cause the pole piece to have wrinkles, be in a wave shape and the like, and further cause the flatness of the pole piece to be poor.

[0084] Please refer to Figure 1 , Figure 1 A schematic diagram of a pole piece M is shown. The pole piece M is in a sheet shape, and has a length, a width and a thickness, the length direction of the pole piece M is as shown in the direction Y in the figure, and the width direction of the pole piece M is as shown in the direction X in the figure. The pole piece M includes a coated area M1 and a blank area M2, and the coated area M1 and the blank area M2 are distributed along the width direction (direction X) of the pole piece M in sequence.

[0085] Please refer to Figure 2 , Figure 2A schematic diagram of the rolling of the pole piece M is shown. During the rolling of the pole piece M, the pole piece M passes through the gap between the two pressure rollers 210. At this time, the thickness direction of the pole piece M is parallel to the distribution direction of the two pressure rollers 210, specifically the direction Z shown in the figure. The width direction of the pole piece M is parallel to the axial direction of the pressure roller 210, so that the coating area M1 and the blank area M2 of the pole piece M are distributed in sequence along the axial direction of the pressure roller 210. The two pressure rollers 210 respectively roll the two sides of the coating area M1 of the pole piece M, so that the slurries on both sides of the coating area M1 are extruded with each other and a certain pressure is applied to the current collector, thereby causing a certain extension of the entire coating area M1. Since the thickness of the coating area M1 is greater than the thickness of the blank area M2, there is a certain gap between the pressure roller 210 and the blank area M2, thereby causing the pressure roller 210 to basically not roll the blank area M2, so that the blank area M2 basically does not produce extension. Understandably, the coating area M1 and the blank area M2 of the pole piece M have extension differences, thereby causing the flatness of the pole piece M to be poor.

[0086] In some cases, by providing an annular protrusion on the outer circumferential surface of the pressure roller 210, the stretching and extension of the blank area M2 of the pole piece M after rolling can be realized, so as to reduce the extension difference between the blank area M2 and the coating area M1, thereby improving the problem of unevenness of the pole piece M. Specifically, after the pole piece M is rolled, the coating area M1 of the pole piece M passes around the outer circumferential surface of the pressure roller 210, and the blank area M2 of the pole piece M passes around the outer circumferential surface of the annular protrusion. In this way, the blank area M2 can be stretched and extended under the action of the annular protrusion, and the extension difference between the blank area M2 and the coating area M1 can be reduced.

[0087] However, the setting of the annular protrusion increases the diameter of the pressure roller 210 corresponding to the position of the annular protrusion, so that during the rotation of the pressure roller 210, the linear speed of the rotation of the blank area M2 passing around the annular protrusion is greater than the linear speed of the rotation of the coating area M1, so that the blank area M2 is subjected to a greater outward radial force than the coating area M1. Moreover, the thickness of the blank area M2 is less than the thickness of the coating area M1. Therefore, the blank area M2 is prone to breakage during extension.

[0088] Based on the above considerations, the first aspect of the embodiments of the present application provides a stretching mechanism. The outer circumferential surface of the roller member is provided with a first groove, and the stretching mechanism can move the blank area of the pole piece towards the first groove. When the pole piece passes around the outer circumferential surface of the roller member, the blank area of the pole piece can be directly opposite the first groove. By moving the blank area of the pole piece towards the first groove through the stretching mechanism, the blank area can be stretched towards the first groove. In this way, the stretching difference between the blank area and the coated area can be reduced, and the problem of unevenness of the pole piece can be improved. Moreover, the outer circumferential surface of the roller member is not provided with an annular protrusion, so that the diameter of the roller member used to pass around the position of the blank area is not increased, and thus the linear speed of the rotation of the blank area during the rotation of the roller member is not increased. Therefore, compared with the scheme of providing an annular protrusion, the stretching mechanism provided by the embodiments can reduce the radial force received by the blank area, thereby improving the problem that the blank area is prone to breakage during stretching.

[0089] It should be noted that the stretching mechanism involved in the embodiments of the present application is developed based on the problem of unevenness of the pole piece in battery manufacturing, but its application scenarios are not limited to this. It can be used in any scenario that requires stretching.

[0090] It can be understood that the stretching mechanism can stretch the blank area of the pole piece, can locally stretch other components in the field of battery manufacturing, and can also locally stretch other components in other fields besides the field of battery manufacturing. In other words, the stretching mechanism is used to stretch the to-be-stretched component, and the to-be-stretched component can be a pole piece or other components that need to be locally stretched. The region of the to-be-stretched component that needs to be stretched is the to-be-stretched region of the to-be-stretched component.

[0091] In order to describe the technical solutions of the present application, the embodiments of the present application mainly take the pole piece as an example for description. The region of the pole piece that needs to be stretched is the blank area, that is, the blank area is the to-be-stretched region of the to-be-stretched component, and the region of the pole piece that does not need to be stretched is the coated area.

[0092] Please refer to Figure 3 and Figure 4 , and in combination with other drawings, Figure 3 show a schematic view of the stretching mechanism 100 cooperating with the pole piece M provided by some embodiments of the present application, Figure 4 show Figure 3 a sectional view along A-A. The stretching mechanism 100 includes a roller member 10 and a blowing device 20. The outer circumferential surface of the roller member 10 is provided with a first groove 101. The outer circumferential surface of the roller member 10 is used to pass around the pole piece M, so that the blank area M2 of the pole piece M is directly opposite the first groove 101. The stretching mechanism 100 is configured to move the blank area M2 directly opposite the first groove 101 towards the first groove 101.

[0093] The roller member 10 is in a cylindrical shape. The roller member 10 has an axial direction, which is parallel to the direction Y shown in Figure 2 FIG. 1. The roller member 10 also has a central axis L, which is parallel to the axial direction of the roller member 10. The outer circumferential surface of the roller member 10 refers to the outer circumferential surface of the roller member 10 around the central axis L.

[0094] The outer circumferential surface of the roller member 10 around the central axis L is recessed to form a first groove 101. The first groove 101 is annular and arranged around the outer circumferential surface of the roller member 10 around the central axis L. It can be understood that the diameter of the roller member 10 corresponding to the position of the first groove 101 is smaller than the diameter of the roller member 10 at other positions.

[0095] For ease of description, in the following embodiments, the outer circumferential surface of the roller member 10 is defined to include the roller surface of the roller member 10 and the groove wall of the first groove 101, that is, the roller surface of the roller member 10 is the surface of the roller member 10 other than the first groove 101. The roller surface of the roller member 10 and the first groove 101 are sequentially arranged along the axial direction of the roller member 10. In this way, when the pole piece M passes around the outer circumferential surface of the roller member 10, the width direction of the pole piece M is parallel to the axial direction of the roller member 10, so that the coated area M1 of the pole piece M and the blank area M2 of the pole piece M are sequentially arranged along the axial direction of the roller member 10. Based on this, the coated area M1 of the pole piece M can pass around the roller surface of the roller member 10, and the blank area M2 of the pole piece M can be opposite to the first groove 101. At this time, the axial direction of the roller member 10 and the width direction of the pole piece M are both parallel to the direction X shown in Figure 5 and Figure 6 FIG. 1.

[0096] The extension mechanism 100 provided by the embodiments of the present application can make the coated area M1 of the pole piece M pass around the roller surface of the roller member 10 and the blank area M2 of the pole piece M opposite to the first groove 101 when the pole piece M passes around the outer circumferential surface of the roller member 10. By moving the blank area M2 of the pole piece M towards the first groove 101 through the extension mechanism 100, the blank area M2 can be extended towards the first groove 101. In this way, the extension difference between the blank area M2 and the coated area M1 can be reduced, and the problem of poor flatness of the pole piece M can be improved.

[0097] In addition, the outer circumferential side of the roller member 10 is not provided with an annular protrusion, so that the diameter of the roller member 10 for the position passing around the blank area M2 is not increased, and thus the linear speed of the blank area M2 during the rotation of the roller member 10 is not increased. Therefore, compared with the scheme of providing an annular protrusion, the extension mechanism 100 provided by the embodiments of the present application can reduce the radial force received by the blank area M2, and thus the problem that the blank area M2 is prone to be broken during the extension can be improved.

[0098] It should be noted that when the pole piece M is processed, the pole piece M can be rolled first so that the coated area M1 of the pole piece M is rolled to produce extension. Then, the rolled pole piece M is wound around the outer circumferential surface of the roller 10 so that the coated area M1 of the pole piece M is wound around the roller surface of the roller 10, and the blank area M2 of the pole piece M is opposite to the first groove 101. Then, the blank area M2 opposite to the first groove 101 is moved towards the first groove 101 by the extension mechanism 100, so that the blank area M2 produces extension during the movement towards the first groove 101.

[0099] In some embodiments, the roller 10 can be a tension floating roller. Specifically, the roller 10 can rotate around the central axis L, and when the pole piece M is wound around the outer circumferential surface of the roller 10 and the pole piece M moves, the roller 10 can rotate under the movement of the pole piece M, so that the outer circumferential surface of the roller 10 can adaptively adjust the tension of the pole piece M. Wherein, when the pole piece M is wound around the outer circumferential surface of the roller 10, the coated area M1 of the pole piece M is wound around the roller surface of the roller 10 and adheres to the roller surface of the roller 10; and the blank area M2 can also be curved and extended towards the first groove 101 under the operation of the extension mechanism 100, and adheres to the groove wall of the first groove 101. In this way, the pole piece M is completely adhered to the outer circumferential surface of the roller 10, and when the pole piece M moves, the roller 10 can rotate under the movement of the pole piece M, so as to adjust the tension of the coated area M1 and the blank area M2 of the pole piece M, and further realize the extension of the coated area M1 and the blank area M2 along the length direction of the pole piece M. Wherein, the length direction of the pole piece M is the same as the movement direction of the pole piece M.

[0100] In some embodiments, please refer to Figures 3 to 5 Wherein Figure 5 It is shown that Figure 3 The expanded cross-sectional view along B-B specifically shows the expanded cross-sectional view of the blowing device 20 of the extension mechanism 100 in some embodiments. The extension mechanism 100 further comprises a blowing device 20, and the blowing device 20 comprises a blow nozzle 21. The blow nozzle 21 is opposite to the first groove 101 and is used for blowing air towards the first groove 101 to blow the blank area M2 opposite to the first groove 101 into the first groove 101.

[0101] The blow nozzle 21 refers to a component for air outlet. In some embodiments, the blow nozzle 21 can be connected to an external gas generating device. In use, the gas generating device generates gas, and the gas is blown out through the blow nozzle 21, thereby realizing the blowing function of the blow nozzle 21. Wherein, the gas generating device can be any device capable of generating gas.

[0102] The air nozzle 21 is arranged outside the first groove 101, and the air outlet side of the air nozzle 21 is opposite to the first groove 101, so that the air nozzle 21 can blow air towards the first groove 101. In addition, the air outlet side of the air nozzle 21 is distributed along the radial direction of the roller 10 away from the outer circumferential surface of the roller 10, so that when the pole piece M passes around the outer circumferential surface of the roller 10, the pole piece M can be located between the air outlet side of the air nozzle 21 and the outer circumferential surface of the roller 10. Specifically, the coated area M1 of the pole piece M passes around the roller surface of the roller 10, and the blank area M2 of the pole piece M is located between the air outlet side of the air nozzle 21 and the first groove 101, and is opposite to the first groove 101. In this way, on the one hand, the operation of the pole piece M passing around the outer circumferential surface of the roller 10 is not interfered by the air nozzle 21. On the other hand, at this time, the air nozzle 21 is opposite to the blank area M2 of the pole piece M, and when the air nozzle 21 blows air, the air blown out of the air nozzle 21 is towards the blank area M2 of the pole piece M, so that the blank area M2 of the pole piece M can be blown into the groove.

[0103] By blowing air towards the first groove 101 by the air nozzle 21, the blank area M2 of the pole piece M can be blown into the first groove 101, so that the blank area M2 can be stretched towards the first groove 101. In this way, by the blowing and stretching device 20 performing the blowing and stretching operation on the blank area M2, the blank area M2 can be stretched towards the first groove 101, so that the difference in stretching between the blank area M2 and the coated area M1 can be reduced, and the problem of poor flatness of the pole piece M can be improved.

[0104] In some embodiments, referring to Figures 3 to 5 , the blowing and stretching device 20 further comprises a first heating member 22, and the first heating member 22 is opposite to the first groove 101 to heat the area to be stretched.

[0105] It can be understood that the first heating member 22 is arranged outside the first groove 101 and is opposite to the first groove 101. In addition, the first heating member 22 is distributed along the radial direction of the roller 10 away from the roller surface of the roller 10. In this way, when the pole piece M passes around the outer circumferential surface of the roller 10, the coated area M1 of the pole piece M can pass around the roller surface of the roller 10, and the blank area M2 of the pole piece M can be located between the first heating member 22 and the first groove 101, and is opposite to the first groove 101. In this way, the operation of the pole piece M passing around the outer circumferential surface of the roller 10 is not interfered by the first heating member 22. In addition, at this time, the first heating member 22 is opposite to the blank area M2 of the pole piece M, and when the first heating member 22 heats, the blank area M2 of the pole piece M can be softened by heat, and then be bent and stretched towards the first groove 101.

[0106] The first heating member 22 can be a heating film, a resistance wire or other components with heating function. In some embodiments, the first heating member 22 can be connected to an external power supply device, and when in use, the power supply device supplies power to the first heating member 22 to heat the first heating member 22, so that the blank area M2 of the pole piece M is softened by heat.

[0107] By adopting the above technical solution, when the pole piece M passes around the outer circumferential surface of the roller 10 so that the blank area M2 of the pole piece M is directly opposite the first groove 101, the first heating member 22 can heat the blank area M2 so that the blank area M2 is softened by heat. In this way, the blank area M2 is more easily bent and extended into the first groove 101 under the blowing action of the tuyere 21, which is beneficial to realizing the extension effect of the blank area M2.

[0108] In addition, the blank area M2 is softened under the heating action of the first heating member 22 and is more easily bent and extended into the first groove 101. In this way, after the blank area M2 is bent and extended into the first groove 101, it can be attached to the groove wall of the first groove 101, and then a certain degree of support can be realized through the groove wall of the first groove 101. Based on this, the support of the blank area M2 by the groove wall of the first groove 101 can improve the problem of the blank area M2 being broken under the blowing action of the tuyere 21, thereby realizing the protection of the blank area M2.

[0109] In some embodiments, the first heating member 22 and the tuyere 21 are distributed along the circumferential direction of the roller 10.

[0110] It should be noted that when the pole piece M passes around the outer circumferential surface of the roller 10, the pole piece M passes around the outer circumferential surface of the roller 10 along the circumferential direction of the roller 10. Based on this, the movement length of the pole piece M corresponds to the circumferential direction of the roller 10, and the length direction of the pole piece M is in an arc direction. At this time, the first heating member 22 and the tuyere 21 are distributed along the length direction of the pole piece M. Among them, as shown in the expanded sectional view of the inflation device 20, the length direction of the pole piece M is parallel to the direction Y. Among them, the movement direction of the pole piece M is parallel to the length direction of the pole piece M. Figure 5

[0111] By adopting the above technical solution, the first heating member 22 and the tuyere 21 are sequentially distributed along the circumferential direction of the roller 10, that is, sequentially distributed along the movement direction of the pole piece M passing around the outer circumferential surface of the roller 10. In this way, when the pole piece M passes around the outer circumferential surface of the roller 10, the blank area M2 of the pole piece M can first pass through the first heating member 22 and then pass through the tuyere 21, that is, each segment of the blank area M2 along the movement direction first passes through the first heating member 22 to be heated and softened, and then is blown by the tuyere 21 into the first groove 101. Alternatively, the blank area M2 of the pole piece M can first pass through the tuyere 21 and then pass through the first heating member 22, that is, each segment of the blank area M2 along the movement direction first passes through the tuyere 21 to be blown into the first groove 101, and then is heated by the first heating member 22 to be heated and softened, so as to be softened into the first groove 101.

[0112] ​In this way, each section of the blank area M2 of the pole piece M in the movement direction can pass through the heating action of the first heating member 22 and the blowing action of the tuyere 21, so that each section of the blank area M2 in the movement direction can be bent and extended towards the first groove 101 to achieve the effect of extension. Based on this, it is helpful to improve the effect of extension of the blank area M2.

[0113] In some embodiments, when the pole piece M passes around the outer circumferential surface of the roller member 10, the pole piece M only passes around the outer circumferential surface of the roller member 10 in one section in the circumferential direction. Based on this, the first heating member 22 and the tuyere 21 can also be distributed on one section of the outer circumferential side of the roller member 10 in the circumferential direction of the roller member 10, so that the use of the first heating member 22 and the tuyere 21 can be reduced.

[0114] In some embodiments, referring to Figure 5 , and in combination with other drawings, the tuyere 21 and the first heating member 22 are arranged as multiple groups, and each group of first heating members 22 and each group of tuyeres 21 are alternately distributed in the circumferential direction of the roller member 10.

[0115] Among them, one group of first heating members 22 can include only one first heating member 22, or can include multiple first heating members 22. Correspondingly, one group of tuyeres 21 can include one tuyere 21, or can include multiple tuyeres 21.

[0116] It can be understood that the number of tuyeres 21 is multiple groups, and the number of first heating members 22 is also multiple groups. The distribution of multiple groups of tuyeres 21 and multiple groups of first heating members 22 in the circumferential direction of the roller member 10 is: the first group of first heating members 22, the first group of tuyeres 21, the second group of first heating members 22, the second group of tuyeres 21, the last group of first heating members 22, the last group of tuyeres 21, and so on. Each group of first heating members 22 and each group of tuyeres 21 are alternately distributed in the circumferential direction of the roller member 10. Among them, the distribution order of the first heating member 22 and the tuyere 21 in the circumferential direction can be adjusted according to actual conditions.

[0117] By adopting the technical scheme, when the pole piece M passes around the outer circumferential surface of the roller 10, each section of the blanking area M2 along the movement direction alternately passes through the heating action of the first heating piece 22 and the blowing action of the tuyere 21, specifically, first passes through a group of first heating pieces 22, a group of tuyeres 21, a group of first heating pieces 22, a group of tuyeres 21, and so on. In this way, each section of the blanking area M2 along the movement direction can pass through the step-by-step heating action of multiple groups of first heating pieces 22, and sequentially pass through the blowing action of multiple groups of tuyeres 21. In this way, multiple groups of first heating pieces 22 sequentially perform step-by-step heating on the blanking area M2, and multiple groups of tuyeres 21 can blow the blanking area M2 after each heating, so that the blanking area M2 can be sequentially and progressively blown into the first groove 101 to sequentially and progressively realize the extension of the blanking area M2. In this way, the problem of over-heating and fracture of the blanking area M2 caused by the first heating piece 22 can be improved.

[0118] In some embodiments, referring to Figure 5 , and in combination with other drawings, the tuyere 21 and the first heating piece 22 are respectively arranged at two ends of the inflation device 20 in the circumferential direction of the roller 10.

[0119] By adopting the technical scheme, the position between the first heating piece 22 at one end of the inflation device 20 and the roller 10 can be used as the position where the pole piece M starts to pass around the roller 10, and the position between the tuyere 21 at the other end of the inflation device 20 and the roller 10 can be used as the position where the pole piece M leaves the roller 10. Based on this, when the pole piece M passes around the outer circumferential surface of the roller 10, each section of the blanking area M2 of the pole piece M along the movement direction can first pass through the first heating piece 22 to be heated and softened. In this way, when each section of the blanking area M2 along the movement direction leaves the outer circumferential surface of the roller 10, the blanking area M2 will finally pass through the tuyere 21 to be blown by the tuyere 21 into the first groove 101. In this way, the blanking area M2 can be better heated and softened, and blown by the tuyere 21 into the first groove 101, so that the extension effect of the blanking area M2 can be better realized.

[0120] In some embodiments, referring to Figure 6 , and in combination with other drawings, Figure 6 shows an expanded cross-sectional view of the inflation device 20 of the extension mechanism 100 provided by another embodiment of the application. The first heating piece 22 and the tuyere 21 are spaced apart along the axial direction of the roller 10.

[0121] It can be understood that when the pole piece M passes around the outer circumferential surface of the roller 10, the first heating member 22 and the air nozzle 21 are spaced apart along the width direction of the pole piece M. Based on this, each section of the blank area M2 along the movement direction can be simultaneously subjected to the heating action of the first heating member 22 and the blowing action of the air nozzle 21. Specifically, the first heating member 22 and the air nozzle 21 are used to perform corresponding actions on different positions of each section of the blank area M2 along the width direction, so that the effect of bending and extending each section of the blank area M2 towards the first groove 101 can be achieved.

[0122] In some embodiments, referring to Figure 6 , and in combination with other drawings, in the axial direction of the roller 10, the first heating member 22 is arranged at both ends of the air nozzle 21.

[0123] It can be understood that when the pole piece M passes around the outer circumferential surface of the roller 10, the air nozzle 21 corresponds to the middle position of the blank area M2 along the width direction, and the first heating member 22 corresponds to the two end positions of the blank area M2 along the width direction. In this way, when each section of the blank area M2 passes through the inflation device 20, the first heating member 22 can heat the two ends of the section of the blank area M2 along the width direction, and the air nozzle 21 blows air towards the middle position of the section of the blank area M2 along the width direction. In this way, the connection position between the blank area M2 and the coated area M1 can be heated and softened under the heating action of the first heating member 22, so as to facilitate the bending and extension of the blank area M2 towards the first groove 101, and then when the air blown by the air nozzle 21 at the middle position of the blank area M2 blows into the first groove 101, the blank area M2 can preferably bend and extend into the first groove 101, thereby facilitating the extension operation of the blank area M2.

[0124] In some embodiments, referring to Figure 5 and Figure 6 , and in combination with other drawings, in the axial direction of the roller 10, the size of the first heating member 22 is less than or equal to the size of the first groove 101.

[0125] By adopting the above technical solution, when the first heating member 22 is directly opposite the first groove 101, the first heating member 22 will not exceed the first groove 101 in the axial direction of the roller 10. In this way, the problem that the coated area M1 of the pole piece M is heated due to the first heating member 22 exceeding the first groove 101 in the axial direction of the roller 10 can be improved, and thus the problem that the coated area M1 of the pole piece M is heated and then extended again to cause a large difference in extension between the coated area M1 and the blank area M2 can be effectively improved.

[0126] In some embodiments, referring to Figure 3 and Figure 5, and in combination with other figures, in a cross section of the stretching mechanism 100 perpendicular to the axial direction of the roller 10, the first heating element 22 and the blow nozzle 21 jointly encircle within half of the circumference of the first groove 101.

[0127] It can be understood that the blow device 20 formed by the first heating element 22 and the blow nozzle 21 extends in an arc shape, and corresponds to one section of the first groove 101 in the circumferential direction. In this way, the first heating element 22 and the blow nozzle 21 can perform heating and blowing on the blank area M2 opposite to the section of the first groove 101. Since the roller 10 can rotate around the central axis L, the “one section of the first groove 101 in the circumferential direction” and “the section of the first groove 101” are variable, and both refer to the section of the first groove 101 opposite to the blow device 20.

[0128] Based on this, when the pole piece M passes around the outer circumferential surface of the roller 10, the pole piece M passes around one section of the outer circumferential surface of the roller 10 in the circumferential direction, which is within half of the outer circumferential surface of the roller 10 in the circumferential direction, that is, within half of the pole piece M passing around the outer circumferential surface of the roller 10 in the circumferential direction. Thus, the first heating element 22 and the blow nozzle 21 perform heating and blowing on the blank area M2 opposite to the section of the first groove 101. In this way, the use of the first heating element 22 and the blow nozzle 21 can be saved.

[0129] In addition, the blow device 20 formed by the first heating element 22 and the blow nozzle 21 extends in an arc shape, so that the distances between the plurality of blow nozzles 21 and the first groove 101 are substantially equal, and the distances between the plurality of first heating elements 22 and the first groove 101 are also substantially equal, so that the blowing effect of the plurality of blow nozzles 21 on the blank area M2 is more stable, and the heating effect of the plurality of first heating elements 22 on the blank area M2 is also more stable.

[0130] In some embodiments, referring to Figure 5 and Figure 6 , and in combination with other figures, the blow nozzle 21 is provided in multiple groups, and the multiple groups of blow nozzles 21 are distributed at intervals in the circumferential direction of the roller 10. One group of blow nozzles 21 includes a plurality of blow nozzles 21, and at least part of the blow nozzles 21 are sequentially distributed in the axial direction of the roller 10.

[0131] It can be understood that when the pole piece M passes around the outer circumferential surface of the roller 10, each section of the blank area M2 in the movement direction sequentially passes through the multiple groups of blow nozzles 21.

[0132] It can also be understood that each group of blow nozzles 21 can perform blowing on multiple positions of the passing blank area M2 in the axial direction of the roller 10, that is, can perform blowing on multiple positions of the blank area M2 in the width direction.

[0133] By adopting the above technical solution, when the pole piece M passes around the outer circumferential surface of the roller 10, each section of the blank area M2 of the pole piece M along the movement direction will pass through the multiple groups of blow nozzles 21 in turn to be blown by the multiple groups of blow nozzles 21. Moreover, at least part of the blow nozzles 21 of each group of blow nozzles 21 are distributed in turn along the width direction of the pole piece M to correspond to multiple positions of the blank area M2 along the width direction. Therefore, when each section of the blank area M2 along the movement direction passes through a group of blow nozzles 21, the group of blow nozzles 21 can realize the blowing action on multiple positions of each section of the blank area M2 along the width direction, so that the blank area M2 can be effectively blown into the first groove 101 to realize the stretching effect of the blank area M2.

[0134] In some embodiments, referring to Figure 5 and Figure 6 together with other drawings, the blow nozzles 21 are arranged as multiple groups, and the multiple groups of blow nozzles 21 are distributed in turn along the circumferential direction of the roller 10. One group of blow nozzles 21 includes multiple blow nozzles 21, and at least part of the blow nozzles 21 are distributed in turn along the circumferential direction of the roller 10.

[0135] It can be understood that when the pole piece M passes around the outer circumferential surface of the roller 10, each section of the blank area M2 along the movement direction will pass through the multiple groups of blow nozzles 21 in turn.

[0136] It can also be understood that each group of blow nozzles 21 can realize the blowing action on multiple positions of the blank area M2 along the circumferential direction of the roller 10, that is, on multiple positions of the blank area M2 along the length direction.

[0137] By adopting the above technical solution, when the pole piece M passes around the outer circumferential surface of the roller 10, each section of the blank area M2 of the pole piece M along the movement direction will pass through the multiple groups of blow nozzles 21 in turn to be blown by the multiple groups of blow nozzles 21. Moreover, at least part of the blow nozzles 21 of each group of blow nozzles 21 are distributed in turn along the movement direction of the pole piece M to correspond to multiple positions of the blank area M2 along the movement direction. Therefore, when each section of the blank area M2 along the movement direction passes through a group of blow nozzles 21, the group of blow nozzles 21 can realize the blowing action on multiple positions of each section of the blank area M2 along the length direction, so that the blank area M2 can be effectively blown into the first groove 101 to realize the stretching effect of the blank area M2.

[0138] In some embodiments, referring to Figures 3 to 6 together with other drawings, the blow inflation device 20 further includes a first connecting piece 23, the first connecting piece 23 is distributed in turn with the roller 10, and the blow nozzles 21 are arranged on the first connecting piece 23.

[0139] The first connecting piece 23 refers to a component capable of fixing the air nozzle 21, and is a main frame of the blowing device 20. The first connecting piece 23 is arranged on the outer side of the roller 10, so that the air nozzle 21 arranged on the first connecting piece 23 is located on the outer side of the roller 10 and faces the first groove 101.

[0140] By adopting the above technical solution, the air nozzle 21 is arranged on the first connecting piece 23, so that the relative position relationship between the air nozzle 21 and the first groove 101 is maintained, and then the facing relationship and the distance between the air nozzle 21 and the first groove 101 are maintained, so that the air nozzle 21 can effectively blow the blanking area M2 in the first groove 101.

[0141] In some embodiments, the first heating piece 22 is also arranged on the first connecting piece 23 and is spaced apart from the air nozzle 21.

[0142] In some embodiments, please refer to Figure 3 , Figure 5 and Figure 6 , and in combination with other drawings, the first connecting piece 23 is provided with a second groove 2301, and the second groove 2301 faces the first groove 101. Part of the roller 10 is arranged in the second groove 2301, so that the first connecting piece 23 is arranged around the first groove 101. The air nozzle 21 is arranged in the second groove 2301.

[0143] As shown in Figure 3 , the second groove 2301 is arc-shaped, and the second groove 2301 extends along the circumferential direction of the roller 10. At least part of the roller 10 in the radial direction is arranged in the second groove 2301, so that the first groove 101 and the second groove 2301 are arranged in the radial direction of the roller 10. In addition, the air nozzle 21 is arranged in the second groove 2301, so that the air nozzle 21 faces the first groove 101.

[0144] By adopting the above technical solution, the air nozzle 21 can face the first groove 101, and when the pole piece M passes around the outer circumferential surface of the roller 10, the air nozzle 21 can blow the blanking area M2 facing the first groove 101 into the first groove 101. In addition, when the number of air nozzles 21 is multiple groups, the multiple groups of air nozzles 21 can face the first groove 101 at a predetermined distance, so that the blowing effect of the air nozzle 21 on the blanking area M2 is very stable. In addition, the arrangement of the second groove 2301 enables the first connecting piece 23 to be arranged around the first groove 101, so that the first connecting piece 23 is spaced apart from the roller surface of the roller 10 in the radial direction at a predetermined distance, so that the pole piece M can stably pass around the outer circumferential surface of the roller 10, and the first connecting piece 23 can also provide a certain limiting effect on the pole piece M.

[0145] It should be noted that when the blowing device 20 further comprises the first heating member 22, the arrangement of the second groove 2301 can also enable the plurality of first heating members 22 to be directly opposite the first groove 101 along the predetermined distance, thereby stably heating the blanking area M2.

[0146] In some embodiments, referring to Figures 4 to 6 , and in combination with other drawings, the number of the first grooves 101 and the number of the blowing devices 20 are both plural, and the plurality of first grooves 101 are spaced along the axial direction of the roller 10. Each blowing device 20 is arranged corresponding to each first groove 101, and the air nozzle 21 of each blowing device 20 is directly opposite the corresponding first groove 101.

[0147] It can be understood that the plurality of first grooves 101 are spaced along the axial direction of the roller 10, and the plurality of blowing devices 20 are also spaced along the axial direction of the roller 10, and the plurality of blowing devices 20 are one-to-one corresponding to the plurality of first grooves 101. Based on this, the air nozzle 21 of each blowing device 20 is directly opposite the corresponding first groove 101.

[0148] Wherein, when the pole piece M has a plurality of blanking areas M2, the plurality of blanking areas M2 are spaced along the width direction of the pole piece M.

[0149] By adopting the above technical solution, when the pole piece M has a plurality of blanking areas M2 and the pole piece M passes around the outer circumferential surface of the roller 10, the width direction of the pole piece M can be parallel to the axial direction of the roller 10, and the plurality of blanking areas M2 can be one-to-one corresponding to the plurality of first grooves 101. In this way, the air nozzle 21 of each blowing device 20 can blow the corresponding blanking area M2 into the corresponding first groove 101, thereby realizing the extension of the plurality of blanking areas M2.

[0150] Correspondingly, when the blowing device 20 comprises the first heating member 22, the first heating member 22 of each blowing device 20 can also be directly opposite the corresponding first groove 101, and the first heating member 22 of each blowing device 20 can heat the corresponding blanking area M2, thereby softening the corresponding blanking area M2 and extending it towards the first groove 101.

[0151] In some embodiments, the extension mechanism 100 further comprises a second connecting member, and the first connecting member 23 of the plurality of blowing devices 20 is connected to the second connecting member. The first connecting member 23 can move relative to the second connecting member to adjust the position of the first connecting member 23 along the axial direction of the roller 10.

[0152] The second connecting member is mainly used for connecting the plurality of blowing devices 20, specifically, each blowing device 20 is connected to the second connecting member through the first connecting member 23.

[0153] In some implementations, the second connecting member can be provided with a sliding rail arranged along the axial direction of the roller member 10, and the first connecting member 23 can be provided with a sliding block, which is slidably arranged on the sliding rail, so that the position of the first connecting member 23 in the axial direction of the roller member 10 can be adjusted. In other implementations, the first connecting member 23 can also be detachably connected to the second connecting member by means of a snap connection, a bolt connection or the like. By detaching the first connecting member 23 from the second connecting member and mounting it at a suitable position in the axial direction of the roller member 10, the position of the first connecting member 23 in the axial direction of the roller member 10 can also be adjusted.

[0154] By adopting the above technical solution, the positions of the plurality of inflation devices 20 in the axial direction of the roller member 10 can be adjusted. In this way, when it is necessary to stretch the pole piece M of different models, for example, the size of the pole piece M in the width direction is different, or the size and position of the coating area M1 and the blank area M2 in the width direction are different, or the number of the coating area M1 and the blank area M2 is different, etc., the size and position of the blank area M2 in the width direction of the pole piece M will be different. By adjusting the positions of the plurality of inflation devices 20 in the axial direction of the roller member 10, the plurality of inflation devices 20 can be corresponded to the plurality of blank areas M2 one by one, so that the application range of the stretching mechanism 100 can be expanded.

[0155] In some embodiments, referring to Figure 7 , and in combination with other drawings, Figure 7 a partial schematic view of the roller member 10 of the stretching mechanism 100 provided by some embodiments of the present application is shown. The slot wall of the first groove 101 is provided with an adsorption hole 104, which is used to adsorb the blank area M2 of the pole piece M.

[0156] It should be noted that in use, an external suction device can be connected to the adsorption hole 104. When the external suction device is working, the adsorption hole 104 can be in a negative pressure state, and then the blank area M2 of the first groove 101 can be adsorbed into the first groove 101 to realize the stretching of the blank area M2. The suction device can be a component or assembly with suction capacity formed by a combination of a gas pump and a gas pipe.

[0157] By adopting the above technical solution, the blank area M2 of the pole piece M can be adsorbed into the first groove 101 to move towards the first groove 101, thereby realizing the stretching of the blank area M2. In this way, compared with the scheme of arranging the inflation device 20 outside the roller member 10, the overall volume of the stretching mechanism 100 can be reduced.

[0158] It needs to be added here that the extension mechanism 100 provided by the embodiments of the present application can realize the effect of the blank area M2 moving towards the first recess 101 through the adsorption holes 104 in the first recess 101, can also realize the effect of the blank area M2 moving towards the first recess 101 through the blowing device 20, and of course can also realize the effect of the blank area M2 moving towards the first recess 101 through the adsorption scheme of the adsorption holes 104 and the blowing scheme of the blowing device 20 at the same time, so as to realize the extension of the blank area M2.

[0159] It also needs to be added here that in the case that the extension mechanism 100 does not provide the blowing device 20 but realizes the extension of the blank area M2 through the adsorption holes 104, the extension mechanism 100 can also provide the first heating member 22 involved in the above-mentioned embodiments, and on the basis of adsorbing the blank area M2 through the adsorption holes 104, the first heating member 22 realizes the heating of the blank area M2, which can make the blank area M2 better move towards the first recess 101 to realize the extension.

[0160] In some embodiments, please refer to Figure 4 , Figure 8 and Figure 9 , and in combination with other drawings, Figure 8 a partial schematic view of the roller 10 of the extension mechanism 100 provided by some embodiments of the present application is shown, Figure 9 a partial schematic view of the roller 10 of the extension mechanism 100 provided by some embodiments of the present application is shown. The extension mechanism 100 further comprises a second heating member 30. The second heating member 30 is arranged on the roller 10, and the second heating member 30 is used to heat the roller 10 to adjust the depth of the first recess 101.

[0161] Among them, the second heating member 30 can be a heating film, a resistance wire or other components with heating function. In some embodiments, the second heating member 30 can be connected to an external power supply device, and when in use, the power supply device supplies power to the second heating member 30 to heat the second heating member 30.

[0162] Among them, when the second heating member 30 is heated, the roller 10 can be heated and deformed, so that the groove wall of the first recess 101 is deformed to realize the depth adjustment of the first recess 101. Among them, the roller 10 is made of a material that can be deformed when heated at least corresponding to the part of the first recess 101, for example, can be a metal material, a plastic material or other materials.

[0163] By adopting the technical scheme, the roller 10 is heated by the second heating member 30 to adjust the depth of the first groove 101, so that the degree of bending and extending of the blank area M2 towards the first groove 101 is realized, that is, the extension rate of the blank area M2 is adjusted. Based on this, when the pole piece M passes around the outer circumferential surface of the roller 10 and the blank area M2 is inflated by the inflation device 20, the depth of the first groove 101 can be adjusted in real time by heating the roller 10 by the second heating member 30 to adjust the extension rate of the blank area M2 in real time. In this way, the extension rate of the blank area M2 can be as close as possible to the extension rate of the coated area M1, thereby reducing the extension difference between the blank area M2 and the coated area M1 and improving the flatness of the pole piece M.

[0164] In some embodiments, please refer to Figure 4 , Figure 8 and Figure 9 , and in combination with other drawings, the roller 10 comprises a plurality of roller segments 11 and at least one deformable member 12. The plurality of roller segments 11 are spaced apart along the axial direction of the roller 10. The deformable member 12 is annular, and the two ends of the deformable member 12 in the axial direction are respectively connected to two adjacent roller segments 11. In some embodiments, as shown in Figure 7 and Figure 8 , the outer circumferential surface of the deformable member 12 is provided with the first groove 101; or, in other embodiments, the outer circumferential surface of the deformable member 12 and the two adjacent roller segments 11 form the first groove 101. The second heating member 30 is arranged on the inner side of the deformable member 12 and is used to heat the deformable member 12.

[0165] The roller segment 11 is one segment of the roller 10 in the axial direction and is also a cylindrical structure. The roller segment 11 can be a solid cylindrical structure or a ring-shaped cylindrical structure. The roller surface of the roller 10 in each of the above embodiments is the outer circumferential surface of the roller segment 11.

[0166] The axial direction of the deformable member 12 is parallel to the axial direction of the roller 10, that is, parallel to the axial direction of the roller segment 11, as shown in the direction Y in Figure 7 and Figure 8 .

[0167] The second heating member 30 is arranged on the inner side of the deformable member 12, which can be that the second heating member 30 is arranged on the inner circumferential surface of the deformable member 12; or, the second heating member 30 and the deformable member 12 are spaced apart, and the deformable member 12 is annularly arranged on the second heating member 30.

[0168] The deformable member 12 refers to a component capable of deformation, and is specifically selected from a material capable of thermal deformation. When the second heating member 30 is heated, the deformable member 12 can be deformed by heat to change the depth of the first groove 101.

[0169] The deformable member 12 and the roller segment 11 can be integrally formed or connected in a split manner. The deformable member 12 and the roller segment 11 can be made of the same material or different materials.

[0170] By adopting the above technical solution, the second heating member 30 is arranged on the inner side of the deformable member 12. When the second heating member 30 is heated, the deformable member 12 can be deformed to change the depth of the first groove 101, so as to adjust the elongation of the white space M2.

[0171] In some embodiments, the second heating member 30 is arranged on the inner circumferential surface of the deformable member 12.

[0172] By adopting the above technical solution, the second heating member 30 is connected to the deformable member 12 and located on the inner circumferential surface of the deformable member 12. In this way, the heat generated by the second heating member 30 can be quickly transferred to the deformable member 12, so that the deformable member 12 can quickly respond and deform to adjust the depth of the first groove 101, thereby the elongation of the white space M2 can be adjusted in real time and quickly during the blowing process of the white space M2 by the blowing device 20, which helps to improve the flatness of the pole piece M.

[0173] In some embodiments, please refer to Figure 4 , Figure 8 and Figure 9 , and in combination with other drawings, the inner circumferential surface of the deformable member 12 is connected with a heat insulation member 40, the heat insulation member 40 and the deformable member 12 enclose a containing space 102, and the second heating member 30 is arranged in the containing space 102.

[0174] The heat insulation member 40 is connected to the inner circumferential surface of the deformable member 12 and encloses the containing space 102 with the inner circumferential surface of the deformable member 12, so that the second heating member 30 is located in the containing space 102. At this time, the second heating member 30 can be connected to the heat insulation member 40 or the deformable member 12 to fix the second heating member 30. The second heating member 30 can also not be connected to the heat insulation member 40 and the deformable member 12, but only be contained in the containing space 102 to be limited by the inner circumferential surface of the deformable member 12 and the heat insulation member 40.

[0175] The heat insulation member 40 can be a mica sheet, a ceramic sheet, or made of carbon fiber, reinforced carbon-carbon composite material, pre-oxidized fiber aerogel, etc. with poor thermal conductivity, mainly used to achieve the heat insulation effect between the second heating member 30 and the roller segment 11.

[0176] By adopting the technical scheme, the second heating member 30 is arranged in the internal space formed by the heat insulation member 40 and the inner circumferential surface of the deformable member 12. In this way, on the one hand, the second heating member 30 is generally in contact with the deformable member 12 and the heat insulation member 40, and is difficult to contact the roller segment 11 under the blocking action of the heat insulation member 40, so that the problem that the heat generated by the second heating member 30 is transmitted to the roller segment 11 to cause the coated area M1 of the pole piece M to be heated and stretched can be improved, and in turn, the stretching difference between the coated area M1 and the blank area M2 can be reduced. On the other hand, the second heating member 30 can maintain the positional relationship with the deformable member 12 under the limiting action of the heat insulation member 40, so that the second heating member 30 can reliably heat the deformable member 12 to adjust the depth of the first groove 101.

[0177] In some embodiments, referring to Figure 9 , and in combination with other drawings, the roller member 10 further comprises a third connecting member 13 connected to the adjacent two roller segments 11. The deformable member 12 is annularly arranged outside the third connecting member 13 and spaced from the third connecting member 13 to form a receiving groove 103. The second heating member 30 is arranged in the receiving groove 103.

[0178] The third connecting member 13 is a component for connecting the adjacent two roller segments 11. Specifically, the third connecting member 13 is arranged between the adjacent two roller segments 11, and the two ends of the third connecting member 13 in the axial direction of the roller member 10 are respectively connected to the adjacent two roller segments 11, thereby achieving the connection between the plurality of roller segments 11.

[0179] The size of the third connecting member 13 in the radial direction of the roller segment 11 is smaller than the size of the roller member 10 in the radial direction, so that the deformable member 12 can be annularly arranged outside the third connecting member 13, and the two ends of the deformable member 12 in the axial direction can be respectively connected to the adjacent two roller segments 11.

[0180] By adopting the technical scheme, the second heating member 30 can be arranged outside the third connecting member 13 first, and then the deformable member 12 can be annularly arranged outside the third connecting member 13, so that the second heating member 30 is located in the receiving groove 103 formed by the inner circumferential surface of the deformable member 12 and the adjacent two roller segments 11. Of course, the second heating member 30 can also be arranged in the deformable member 12 first, and then the deformable member 12 can be assembled with the roller segment 11, so as to realize the arrangement of the second heating member 30 in the roller member 10. In this way, the arrangement operation of the second heating member 30 in the roller member 10 is relatively simple. Moreover, the receiving groove 103 for accommodating the second heating member 30 is formed by spacing the third connecting member 13 and the deformable member 12, so that the second heating member 30 can be fixed to a certain extent, and the heating effect of the second heating member 30 on the deformable member 12 can be maintained.

[0181] In other embodiments, when the roller member 10 is not provided with the third connecting member 13, the roller segment 11 can be provided as a hollow annular structure, and the second heating member 30 can be assembled in the hollow position of the roller segment 11.

[0182] In some embodiments, referring to Figure 4 , Figure 8 and Figure 9 together with other drawings, the roller surface of the roller member 10 is circularly arc transitioned with the groove wall of the first groove 101.

[0183] It can be understood that the outer circumferential surface of the roller segment 11 is circularly arc transitioned with the groove wall of the first groove 101.

[0184] By adopting the technical solutions described above, the problem that the connection between the roller surface of the roller member 10 and the groove wall of the first groove 101 cannot maintain the piercing of the pole piece M can be improved, and the pole piece M can be protected.

[0185] Based on the above idea, referring to Figure 10 together with other drawings, Figure 10 a cooperation schematic view of a pole piece processing equipment 1000 and a pole piece M provided by some embodiments of the present application is shown. The second aspect of the embodiments of the present application provides a pole piece processing equipment 1000, which comprises an extension mechanism 100 for extending the pole piece M. Wherein, the extension mechanism 100 in the embodiments is the same as the extension mechanism 100 in the above-mentioned embodiments, and the specific description is referred to the related description in the above-mentioned embodiments, which will not be described here.

[0186] Wherein, the extension mechanism 100 is used for extending the pole piece M, and specifically can be used for extending the blank area M2 of the pole piece M.

[0187] The pole piece processing equipment 1000 provided by the embodiments of the present application, since the extension mechanism 100 involved in the above-mentioned embodiments is adopted, can also make the blank area M2 extend towards the first groove 101, so as to reduce the extension difference between the blank area M2 and the coated area M1, and further improve the problem of poor flatness of the pole piece M. Moreover, compared with the scheme of providing an annular boss, the embodiments can also reduce the radial force on the blank area M2, so as to improve the problem that the blank area M2 is prone to breakage during the extension process, and thus the quality of the pole piece M can be improved.

[0188] In some embodiments, referring to Figure 10 together with other drawings, the pole piece processing equipment 1000 further comprises a roller pressing mechanism 200, the roller pressing mechanism 200 is used for rolling the pole piece M, and the extension mechanism 100 is used for extending the pole piece M after being rolled.

[0189] The rolling mechanism 200 refers to a component for performing a rolling operation on the pole piece M. Specifically, the rolling mechanism 200 includes two pressure rollers 210. In operation, the pole piece M passes through the gap between the two pressure rollers 210, so that the axial direction of the pressure rollers 210 is parallel to the width direction of the pole piece M. In this way, the two pressure rollers 210 can extrude the two sides of the pole piece M in the thickness direction, so that the slurry of the pole piece M is compacted on the current collector.

[0190] Specifically, in operation, the pole piece M sequentially passes through the rolling mechanism 200 and the stretching mechanism 100. Specifically, the pole piece M first passes through the rolling mechanism 200, and the rolling mechanism 200 performs rolling on the pole piece M to cause the stretching of the coated area M1 of the pole piece M. Then, the pole piece M passes through the stretching mechanism 100, and the blank area M2 of the pole piece M is bent and stretched towards the first groove 101 of the roller piece 10 under the action of the stretching mechanism 100 to cause the stretching. Therefore, the rolling mechanism 200 and the stretching mechanism 100 respectively realize the stretching of the coated area M1 and the blank area M2 of the pole piece M, so that the pole piece M has better flatness.

[0191] The roller piece 10 of the stretching mechanism 100 can be a tension floating roller. When the pole piece M passes around the outer circumferential surface of the roller piece 10, the coated area M1 of the pole piece M passes around the roller surface of the roller piece 10 and is attached to the roller surface of the roller piece 10. The blank area M2 of the pole piece M is bent and stretched towards the first groove 101 under the action of the stretching mechanism 100 to be attached to the groove wall of the first groove 101. When the pole piece M moves, the roller piece 10 can rotate around the center axis L to move with the pole piece M, so as to adjust the tension of the pole piece M, and thus realize the stretching of the blank area M2 and the coated area M1 of the pole piece M along the length direction of the pole piece M.

[0192] As one of the embodiments of the present application, the stretching mechanism 100 includes a roller piece 10, a blowing device 20, a second heating piece 30, and a heat insulation piece 40. The outer circumferential surface of the roller piece 10 is annularly provided with a first groove 101. The blowing device 20 includes a plurality of groups of nozzles 21 and a plurality of groups of first heating pieces 22. Each group of nozzles 21 and each group of first heating pieces 22 are alternately distributed along the circumferential direction of the roller piece 10. The second heating piece 30 is arranged on the roller piece 10 and is used to heat and soften the part of the roller piece 10 corresponding to the first groove 101 to adjust the depth of the first groove 101. The heat insulation piece 40 is used to realize the heat insulation between the second heating piece 30 and the other part of the roller piece 10 except the first groove 101.

[0193] When the extension mechanism 100 works, the pole piece M passes around the outer circumferential surface of the roller 10, specifically, the coated area M1 of the pole piece M passes around the roller surface of the roller 10, and the blank area M2 of the pole piece M is opposite to the first groove 101. In the movement process of the pole piece M, the blank area M2 of the pole piece M alternately receives the heating action of the first heating element 22 and the blowing action of the air nozzle 21, so as to bend and extend the blank area M2 towards the first groove 101, and the blank area M2 is attached to the groove wall of the first groove 101. Moreover, the second heating element 30 can heat the roller 10 to adjust the depth of the first groove 101, and further adjust the bending and extending degree of the blank area M2 towards the first groove 101, that is, adjust the extension rate of the blank area M2.

[0194] The above only is optional embodiment of the present application, and is not used to limit the present application. The present application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. A spreading mechanism (100), wherein, The application relates to a stretching mechanism (100) for a rolling piece (10) with a first groove (101) arranged on the outer circumferential surface of the rolling piece (10) and used for passing a piece to be stretched with a to-be-stretched area opposite to the first groove (101). The stretching mechanism (100) is configured to move the to-be-stretched area towards the first groove (101). The stretching mechanism (100) further comprises a blowing device (20) comprising a blowing nozzle (21) opposite to the first groove (101) and used for blowing air towards the first groove (101) to blow the to-be-stretched area into the first groove (101).

2. The extensor mechanism (100) according to claim 1, wherein The blowing device (20) further comprises a first heating piece (22) opposite to the first groove (101) and used for heating the to-be-stretched area.

3. The spreading mechanism (100) according to claim 2, wherein The first heating piece (22) and the blowing nozzle (21) are distributed along the circumference of the rolling piece (10).

4. The spreading mechanism (100) according to claim 3, wherein The blowing nozzle (21) and the first heating piece (22) are arranged in multiple groups, and the first heating pieces (22) and the blowing nozzles (21) in each group are alternately distributed along the circumference of the rolling piece (10).

5. The spreading mechanism (100) according to claim 3 or 4, wherein The blowing nozzle (21) and the first heating piece (22) are arranged at two ends of the blowing device (20) along the circumference of the rolling piece (10).

6. The spreading mechanism (100) according to any one of claims 3-5, wherein, The first heating piece (22) and the blowing nozzle (21) are distributed along the axis of the rolling piece (10).

7. The extensor mechanism (100) of claim 3, wherein, The first heating piece (22) is arranged at two ends of the blowing nozzle (21) along the axis of the rolling piece (10).

8. The spreading mechanism (100) according to claim 7, wherein The size of the first heating piece (22) is smaller than or equal to the size of the first groove (101) along the axis of the rolling piece (10).

9. The spreading mechanism (100) according to any one of claims 3-8, wherein, In a cross section of the stretching mechanism (100) perpendicular to the axis of the rolling piece (10), the first heating piece (22) and the blowing nozzle (21) jointly enclose a half of the circumference of the first groove (101).

10. The extensor mechanism (100) according to any one of claims 3-9, wherein, The blowing nozzle (21) is arranged in multiple groups, and the blowing nozzles (21) in each group are distributed along the circumference of the rolling piece (10); one group of the blowing nozzles (21) comprises a plurality of blowing nozzles (21), and at least part of the blowing nozzles (21) are sequentially distributed along the axis of the rolling piece (10).

11. The extensor mechanism (100) according to any one of claims 2-10, wherein, The blowing nozzle (21) is arranged in multiple groups, and the blowing nozzles (21) in each group are distributed along the circumference of the rolling piece (10); one group of the blowing nozzles (21) comprises a plurality of blowing nozzles (21), and at least part of the blowing nozzles (21) are sequentially distributed along the circumference of the rolling piece (10).

12. The extensor mechanism (100) according to any one of claims 2-11, wherein, The blowing device (20) further comprises a first connecting piece (23) distributed along the axis of the rolling piece (10), and the blowing nozzle (21) is arranged on the first connecting piece (23).

13. The spreading mechanism (100) according to any one of claims 2-12, wherein, ​ 14. The spreading mechanism (100) according to claim 13, wherein The first connecting piece (23) is provided with a second groove (2301) which is opposite to the first groove (101), and a part of the roller piece (10) is arranged in the second groove (2301) to allow the first connecting piece (23) to be arranged around the first groove (101); the blow nozzle (21) is arranged in the second groove (2301).

15. The extensor mechanism (100) according to any one of claims 2-14, wherein, The number of the first grooves (101) and the number of the blow devices (20) are both plural, the first grooves (101) are arranged at intervals along the axial direction of the roller piece (10); each blow device (20) is arranged corresponding to each first groove (101), and the blow nozzle (21) of each blow device (20) is opposite to the corresponding first groove (101).

16. The spreading mechanism (100) according to claim 15, wherein The blow device (20) further comprises a first connecting piece (23), and the blow nozzle (21) is arranged on the first connecting piece (23). The extension mechanism (100) further comprises a second connecting piece, the first connecting pieces (23) of the plural blow devices (20) are all connected to the second connecting piece, and the first connecting pieces (23) can move relative to the second connecting piece to adjust the positions of the first connecting pieces (23) along the axial direction of the roller piece (10).

17. The malleable mechanism (100) according to any one of claims 1-16, wherein, The groove wall of the first groove (101) is provided with a suction hole (104) which is used for sucking the area to be extended.

18. The extensor mechanism (100) according to any one of claims 1-17, wherein, The extension mechanism (100) further comprises a second heating piece (30) arranged on the roller piece (10), and the second heating piece (30) is used for heating the roller piece (10) to adjust the depth of the first groove (101).

19. The spreading mechanism (100) according to claim 18, wherein The roller piece (10) comprises: plural roller segments (11) arranged at intervals along the axial direction; a deformable piece (12) in the shape of a ring, two ends of the deformable piece (12) along the axial direction are connected to two adjacent roller segments (11) respectively; the outer circumferential surface of the deformable piece (12) is provided with the first groove (101), or the outer circumferential surface of the deformable piece (12) and the two adjacent roller segments (11) enclose the first groove (101); the second heating piece (30) is arranged on the inner side of the deformable piece (12) and is used for heating the deformable piece (12).

20. The spreading mechanism (100) according to claim 19, wherein The second heating piece (30) is arranged on the inner circumferential surface of the deformable piece (12).

21. The spreading mechanism (100) according to claim 19 or 20, wherein The inner circumferential surface of the deformable piece (12) is connected to a heat insulation piece (40), the heat insulation piece (40) and the deformable piece (12) enclose a containing space (102), and the second heating piece (30) is arranged in the containing space (102).

22. The extensor mechanism (100) according to any one of claims 19-21, wherein, The roller piece (10) further comprises a third connecting piece (13) connected to two adjacent roller segments (11), the deformable piece (12) is arranged outside the third connecting piece (13) and forms a containing groove (103) with the third connecting piece (13), and the second heating piece (30) is arranged in the containing groove (103).

23. The malleable mechanism (100) according to any one of claims 1-22, wherein, The roller surface of the roller piece (10) and the groove wall of the first groove (101) are circularly arc transitioned.

24. A pole piece processing apparatus (1000), wherein, The drawing mechanism (100) according to any one of claims 1-23 is used for drawing the pole piece (M).

25. The pole piece processing apparatus (1000) of claim 24, wherein, The pole piece processing device (1000) further comprises a rolling mechanism (200) used for rolling the pole piece (M), and the drawing mechanism (100) is used for drawing the rolled pole piece (M).

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