WO2024164422A1

WO2024164422A1 - Roller assembly and winding apparatus

Info

Publication number: WO2024164422A1
Application number: PCT/CN2023/086665
Authority: WO
Inventors: 孙祥立; 杨国众; 林秀娟; 李丰丹; 阳超
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2023-02-10
Filing date: 2023-04-06
Publication date: 2024-08-15
Also published as: CN219052482U

Abstract

A roller assembly (100) and a winding apparatus. The roller assembly (100) comprises: a roller (10); a mounting bracket (20), the mounting bracket (20) being sleeved on one end of the roller (10); and a limiting plate (30), the limiting plate (30) being disposed on the mounting bracket (20) and extending along a circumference of the roller (10), a gap (40) being formed between the limiting plate (30) and a peripheral wall of the roller (10) for a tab (51) of a battery pole piece (50) to pass through, and the limiting plate (30) being used to limit the tab (51) so as to control deformation of the tab (51). An end portion of the mounting bracket (20) facing away from the battery pole piece (50) is provided with an opening (24), the opening (24) being in communication with the gap (40).

Description

Roller assembly and winding device

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on the Chinese patent application with application number 202320182674.2 and application date February 10, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference.

Technical Field

The present application relates to the technical field of winding devices, and in particular to a roller assembly and a winding device.

Background Art

After the battery pole piece's tab is formed, its shape is similar to wings and its structural strength is low. When the battery pole piece is wound at high speed, especially when the tab runs to the roller, factors such as gravity, stress, and wind resistance will cause the tab to fold, collapse, and show crescent marks. Moreover, the above-mentioned phenomenon of the tab will be aggravated with the increase of battery cell winding speed, increase of tab height, and thinning of tab thickness, which restricts the battery production efficiency and the performance of the process.

Summary of the invention

In view of the above problems, the present application provides a roller assembly, which can improve the problems of collapsed edge, crescent mark, folding, etc. of the pole ear.

The present application also proposes a winding device having the above-mentioned roller assembly.

In the first aspect, the present application provides a roller assembly, comprising: a roller; a mounting bracket, the mounting bracket being sleeved on one end of the roller; a limit plate, the limit plate being arranged on the mounting bracket and at least a portion of the limit plate extending along the circumference of the roller, a gap being provided between the limit plate and the peripheral wall of the roller for the pole ear of the battery electrode to pass through, the limit plate being used to limit the pole ear to control the deformation of the pole ear; wherein the end of the mounting bracket facing away from the battery electrode sheet has an opening, and the opening is connected to the gap.

In the technical solution of the embodiment of the present application, by arranging a mounting bracket and a limit plate at one end of the roller, the pole ear of the battery pole piece can enter the gap between the limit plate and the roller under the guidance of the limit plate. During the movement of the battery pole piece, the limit plate can limit the pole ear, thereby suppressing and correcting the deformation of the pole ear, restoring the pole ear to a normal shape, and improving problems such as collapsed edge, crescent mark, and folding of the pole ear; by setting an opening, the gap can be seen through the opening, thereby checking the size between the limit plate and the roller and the battery pole piece, which is not only convenient for installation and debugging, but also convenient for inspection and troubleshooting during work.

In some embodiments, the limit plate is connected to the mounting bracket on one side of the axial direction of the roller to prevent interference between the limit plate and the pole ear, thereby ensuring that the pole ear of the battery pole sheet can enter the gap between the limit plate and the roller and can run along the circumference of the roller.

In some embodiments, the distance between the root of the pole ear and the limit plate in the axial direction of the roller is greater than 0 mm and less than 10 mm, or equal to 10 mm, which can prevent one side of the width direction of the battery electrode from interfering with the limit plate and prevent the battery electrode from deforming during operation.

In some embodiments, the dimension of the limiting plate in the axial direction of the roller is 50 mm-115 mm. By limiting the above dimension, the limiting plate can cover at least a part of the pole ear, ensuring that the pole ear can extend into the gap between the limiting plate and the roller, so that the limiting plate can suppress and correct the deformation of the pole ear, restore the pole ear to a normal shape, and improve the problems of the pole ear collapse, crescent mark, folding, etc.

In some embodiments, the distance between the root of the pole ear and the limiting plate in the axial direction of the roller is W, the dimension of the limiting plate in the axial direction of the roller is W1, and the ratio of W1 to W is greater than 5. Through the above range, one side of the width direction of the battery pole piece can be prevented from interfering with the limiting plate, thereby preventing the battery pole piece from being deformed during operation.

In some embodiments, the outer peripheral wall of the mounting bracket has a limiting convex portion extending along the circumference thereof, and the limiting plate is in contact with the side wall of the limiting convex portion on one side in the axial direction of the roller. By providing the limiting convex portion on the mounting bracket, the limiting convex portion can be used as an installation reference for the limiting plate, thereby limiting the distortion and deformation of the limiting plate.

In some embodiments, the outer peripheral wall of the mounting bracket has a plurality of first connection holes, the limiting plate has a plurality of second connection holes, the limiting plate and the mounting bracket are connected by a plurality of fasteners, and each of the fasteners is inserted through the corresponding first connection hole and the second connection hole. By using a plurality of fasteners to fix the limiting plate on the mounting bracket, the installation reliability and stability of the limiting plate can be ensured, and the limiting plate can be prevented from falling off from the mounting bracket.

In some embodiments, a plurality of the second connection holes are arranged at intervals along the circumference of the roller. Such an arrangement can ensure the installation reliability and stability of the limit plate in the circumference of the roller, prevent the limit plate from being separated from the mounting bracket in the circumference of the roller, and thus avoid the occurrence of edge collapse, crescent marks, folding and other problems of the tab.

In some embodiments, the limit plate includes a head, a guide portion and a smoothing portion, wherein the head, the guide portion and the smoothing portion are arranged in a preset direction and the guide portion is located between the head and the smoothing portion, and the smoothing portion extends along the circumference of the roller, wherein each of the guide portion and the smoothing portion has the gap with the roller, and the head extends from the direction close to the guide portion toward the direction close to the mounting bracket. Even if the tab is deformed, it can be smoothly introduced into the gap between the limit plate and the roller under the guidance of the head; when the tab cuts into the gap between the guide portion and the roller, the guide portion can timely suppress the deformation of the tab to avoid the tab from collapsing, crescent marks, folding and other problems.

In some embodiments, the distance between the end of the head away from the guide portion and the battery electrode in the thickness direction of the battery electrode is 15mm-30mm, further ensuring that the deformation of the electrode ear can be smoothly introduced into the gap between the limiting plate and the roller under the guidance of the head, thereby timely suppressing the deformation of the electrode ear and avoiding problems such as edge collapse, crescent marks, and folding of the electrode ear.

In some embodiments, the head forms an arc-shaped plate portion, and the radius of the arc-shaped plate portion is 20 mm-40 mm. By limiting the radius of the arc-shaped plate portion to meet the above range, it is further ensured that the deformation of the tab can also be smoothly introduced into the gap between the limit plate and the roller under the guidance of the head, thereby timely suppressing the deformation of the tab and avoiding the problems of edge collapse, crescent marks, folding, etc. of the tab.

In some embodiments, the guide portion is formed into a flat plate portion, and the distance between the guide portion and the battery electrode in the thickness direction of the battery electrode is 1mm-2mm; and/or the length of the guide portion is 20mm-60mm. By limiting the size of the guide portion to meet the above conditions, and combining the size of the head, etc., the deformed electrode can be suppressed and corrected. The ear can restore its normal shape and improve the collapsed edge, crescent mark and folded ear.

In some embodiments, the outer peripheral wall of the over-roller has a first peripheral surface and a second peripheral surface arranged along its axial direction; wherein, the first peripheral surface is arranged close to the mounting bracket and is lower than the second peripheral surface to define a step surface between the two, the limiting plate is directly opposite to the first peripheral surface and there is the gap between the limiting plate and the first peripheral surface, and the battery pole piece is suitable for matching with the second peripheral surface. By setting the step surface on the over-roller, the first peripheral surface can avoid the pole ear, so that during the operation of the battery pole piece, the over-roller will not deform the pole ear, and it can also ensure that the gap between the limiting plate and the over-roller meets the specific size requirements, so that the limiting plate can suppress and correct the deformed pole ear, so that the pole ear can restore the normal morphology, and improve the pole ear collapse, crescent mark, and pole ear folding.

In some embodiments, the distance between the step surface and the root of the pole lug in the axial direction of the roller is 0 to 3 mm. By limiting the distance between the step surface and the root of the pole lug to meet the above range, it is ensured that the pole lug can extend into the gap between the limiting plate and the roller, so that the limiting plate can suppress and correct the deformation of the pole lug, restore the normal shape of the pole lug, and improve the problems of the pole lug collapse, crescent mark, folding, etc.

In some embodiments, the height difference between the first circumferential surface and the second circumferential surface is 0.1 mm-0.5 mm. By limiting the height difference between the first circumferential surface and the second circumferential surface to meet the above-mentioned size requirements, the limiting plate can suppress and correct the deformed tab, so that the tab can restore its normal shape, and improve the tab collapse, crescent mark, and tab folding.

In some embodiments, the outer peripheral wall of the mounting bracket has an avoidance groove, the avoidance groove extends toward the end of the mounting bracket facing away from the battery electrode sheet to form the opening at the end of the mounting bracket, and the avoidance groove connects the opening and the gap. By providing the opening and the avoidance groove, the gap can be seen through the opening, so that the size between the limit plate and the roller and the battery electrode sheet can be checked, which is not only convenient for installation and debugging, but also convenient for inspection and troubleshooting during the working process.

In some embodiments, the avoidance grooves include a plurality of avoidance grooves, which are arranged at intervals along the circumference of the mounting bracket. In this way, the dimensions between the limit plate and the roller and the battery pole piece can be checked at different positions, further facilitating installation, debugging, inspection during operation, and troubleshooting.

In a second aspect, the present application provides a winding device, comprising a roller assembly according to the above embodiment.

In the technical solution of the embodiment of the present application, by adopting the above-mentioned roller assembly, the deformation of the pole ear can be suppressed and corrected, the pole ear can be restored to a normal shape, and the problems of collapsed edge, crescent mark, folding, etc. of the pole ear can be improved.

Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic structural diagram of a roller assembly in some embodiments of the present application, wherein a battery pole piece is disposed in the roller assembly;

FIG2 is a top view of the roller assembly shown in FIG1 ;

FIG3 is a side view of the roller assembly shown in FIG1 ;

FIG4 is a side view of the roller assembly shown in FIG1 ;

FIG5 is a schematic diagram of the structure of a roller assembly in some embodiments of the present application, wherein the battery pole piece is not provided on the roller assembly;

FIG. 6 is a side view of the roller assembly shown in FIG. 5 .

Reference numerals:

Roller assembly 100,

Roller 10, first circumferential surface 101, second circumferential surface 102, step surface 103,

The mounting bracket 20, the limiting protrusion 21, the first connecting hole 22, the avoidance groove 23, the opening 24,

The limiting plate 30, the second connecting hole 301, the head 31, the guide part 32, the smoothing part 33,

Gap 40,

Battery pole piece 50 and pole ear 51.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

The term "and/or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/" in this application generally indicates that the associated objects before and after are in an "or" relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and for the sake of simplicity, the same reference numerals are used in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation to the present application.

At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

The winding process is the mainstream process for battery cell manufacturing. It uses a fixed winding needle to wind the slit positive electrode sheet, separator, and negative electrode sheet in sequence and extrude them into a cylindrical, elliptical, or square shape, and then place them in a square or cylindrical metal shell. Parameters such as the size of the electrode sheet and the number of winding turns are determined according to the battery design capacity, and it has the characteristics of high production efficiency.

However, in the production process, after the battery pole piece's tabs are formed, their shape is similar to wings and their structural strength is low. When the battery pole piece is wound at high speed, especially when the tabs run to the roller, factors such as gravity, stress, and wind resistance will cause the tabs to fold, collapse, and show crescent marks. Moreover, the above-mentioned phenomena of the tabs will be aggravated with the increase of the winding speed of the battery cell, the increase of the tab height, and the thinning of the tab thickness, which restricts the production efficiency of the battery and the performance of the process.

In order to improve the problems of collapsed edge, crescent mark, folding and so on of the tab, the inventor designed a roller assembly after in-depth research. By setting a mounting bracket and a limit plate at one end of the roller, the limit plate can be used to control the deformation of the tab during the movement of the battery pole piece, so that the tab can return to its normal shape.

The roller assembly disclosed in the embodiment of the present application can be used for, but not limited to, winding devices such as winders, and can also be used in other devices that require shaping of the tabs, such as rolling devices and die-cutting devices.

The roller assembly 100 according to an embodiment of the present application is described below with reference to FIGS. 1 to 6 .

Please refer to FIG. 1 , which is a schematic structural diagram of a roller assembly 100 according to some embodiments of the present application. A battery pole piece 50 is disposed on the roller assembly 100 . The roller assembly 100 includes a roller 10 , a mounting bracket 20 and a limiting plate 30 .

The mounting bracket 20 is sleeved on one end of the roller 10, the limiting plate 30 is arranged on the mounting bracket 20, and at least a part of the limiting plate 30 extends along the circumference of the roller 10, and there is a gap 40 between the limiting plate 30 and the peripheral wall of the roller 10, and the gap 40 can allow the pole ear 51 of the battery electrode 50 to pass through, and the limiting plate 30 is used to limit the pole ear 51 to control the deformation of the pole ear 51.

The end of the mounting bracket 20 facing away from the battery electrode 50 has an opening 24 , and the opening 24 is connected to the gap 40 .

In the technical solution of the embodiment of the present application, by arranging a mounting bracket 20 and a limit plate 30 at one end of the roller 10, the pole ear 51 of the battery pole piece 50 can enter the gap 40 between the limit plate 30 and the roller 10 under the guidance of the limit plate 30. During the movement of the battery pole piece 50, the limit plate 30 can limit the pole ear 51, so as to control the deformation of the pole ear 51. Specifically, the deformation of the pole ear 51 can be suppressed and corrected, so that the pole ear 51 can restore its normal morphology, and improve the problems of collapsed edge, crescent mark, folding, etc. of the pole ear 51; by setting the opening 24, the size between the limit plate 30 and the roller 10 and the battery pole piece 50 can be checked through the opening 24, which is not only convenient for installation and debugging, but also convenient for inspection and troubleshooting during work.

In some embodiments, the limiting plate 30 is connected to the mounting bracket 20 on one side of the roller 10 in the axial direction.

Specifically, when the limiting plate 30 is in the unfolded state, the length direction of the limiting plate 30 is defined along the direction shown in FIG. 1 and FIG. 2 The limiting plate 30 extends in the front-to-rear direction, and the width direction of the limiting plate 30 extends in the left-to-right direction as shown in FIGS. 1 and 2 .

When the limit plate 30 is in a bent state, at least a portion of the length direction of the limit plate 30 extends roughly along the circumference of the roller 10, and the width direction of the limit plate 30 extends along the axial direction of the roller 10. One side of the width direction of the limit plate 30 (the left side of the limit plate 30 as shown in Figure 2) is connected to the mounting bracket 20.

That is to say, one side of the limit plate 30 in the width direction is connected to the mounting bracket 20, and the other side of the limit plate 30 in the width direction is spaced apart from the roller 10, so that the limit plate 30 forms a cantilever structure with one side in the width direction fixed, thereby preventing the limit plate 30 from interfering with the pole ear 51, ensuring that the pole ear 51 of the battery electrode 50 can enter the gap 40 between the limit plate 30 and the roller 10, and can operate along the circumference of the roller 10.

Please refer to Figure 2, which is a top view of the roller assembly 100 of some embodiments of the present application. The distance W between the root of the pole ear 51 and the limit plate 30 in the axial direction of the roller 10 is greater than 0 mm and less than 10 mm, or equal to 10 mm.

For example, the distance W between the root of the pole ear 51 and the limiting plate 30 in the axial direction of the roller 10 can be 3 mm, 6 mm, 8 mm, 10 mm, etc. By limiting the distance between the root of the pole ear 51 and the limiting plate 30 to meet the above range, it is possible to prevent one side of the width direction of the battery pole piece 50 from interfering with the limiting plate 30, and prevent the battery pole piece 50 from being deformed during operation.

In some embodiments, the dimension W1 of the limit plate 30 in the axial direction of the roller 10 is 50mm-115mm. For example, the dimension W1 of the limit plate 30 in the axial direction of the roller 10 can be 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 115mm, etc.

Therefore, by limiting the axial size of the limit plate 30 in the roller 10 to meet the above-mentioned range, the limit plate 30 can cover at least a portion of the pole ear 51, ensuring that the pole ear 51 can extend into the gap 40 between the limit plate 30 and the roller 10. In this way, the limit plate 30 can suppress and correct the deformation of the pole ear 51, restore the pole ear 51 to its normal shape, and improve the problems of collapsed edge, crescent mark, folding, etc. of the pole ear 51.

In some embodiments, the distance between the root of the pole ear 51 and the limiting plate 30 in the axial direction of the roller 10 is W, the dimension of the limiting plate 30 in the axial direction of the roller 10 is W1, and the ratio of W1 to W is greater than 5. By limiting the ratio of W1 to W to meet the above range, it is possible to prevent one side of the width direction of the battery pole piece 50 from interfering with the limiting plate 30, and prevent the battery pole piece 50 from deforming during operation.

Referring to FIG. 1 and further to FIG. 5, FIG. 5 is a schematic diagram of the structure of the roller assembly 100 of some embodiments of the present application, wherein the battery pole piece 50 is not provided on the roller assembly 100. The outer peripheral wall of the mounting bracket 20 has a limiting protrusion 21, and the limiting protrusion 21 extends along the circumferential direction of the mounting bracket 20, and one side of the limiting plate 30 in the axial direction of the roller 10 is suitable for fitting with the side wall of the limiting protrusion 21. By providing the limiting protrusion 21 on the mounting bracket 20, the limiting protrusion 21 can be used as the installation reference of the limiting plate 30, so that the limiting plate 30 can be limited from being twisted and deformed.

The mounting bracket 20 can be made of aluminum, and the limiting plate 30 can be made of stainless steel, which can not only ensure the structural strength of the limiting plate 30 but also prevent the material of the limiting plate 30 from causing adverse effects on the tab 51 .

1 and 5, in some embodiments, the outer peripheral wall of the mounting bracket 20 has a plurality of first connection holes 22, the limiting plate 30 has a plurality of second connection holes 301, and the limiting plate 30 is connected to the mounting bracket 20 by a plurality of fasteners. Each fastener is inserted into the corresponding first connection hole 22 and second connection hole 301 .

Therefore, by fixing the limiting plate 30 on the mounting bracket 20 using a plurality of fasteners, the installation reliability and stability of the limiting plate 30 can be ensured, and the limiting plate 30 can be prevented from falling off from the mounting bracket 20 .

In some embodiments, the plurality of second connection holes 301 are arranged at intervals along the circumference of the roller 10. Correspondingly, the plurality of first connection holes 22 are arranged at intervals along the circumference of the mounting bracket 20. Such an arrangement can ensure the installation reliability and stability of the limit plate 30 in the circumferential direction of the roller 10, prevent the limit plate 30 from being separated from the mounting bracket 20 in the circumferential direction of the roller 10, and thus avoid the occurrence of edge collapse, crescent marks, folding and other problems of the tab 51.

Referring to FIG. 2 , and further referring to FIG. 4 and FIG. 6 , FIG. 4 is a side view of a roller assembly 100 of some embodiments of the present application, wherein the battery pole piece 50 is provided in the roller assembly 100. FIG. 6 is a side view of a roller assembly 100 of some embodiments of the present application, wherein the battery pole piece 50 is not provided in the roller assembly 100. The limiting plate 30 includes a head 31, a guide portion 32, and a smoothing portion 33, wherein the head 31, the guide portion 32, and the smoothing portion 33 are arranged in a preset direction, the guide portion 32 is connected between the head 31 and the smoothing portion 33, the smoothing portion 33 extends along the circumferential direction of the roller 10, each of the guide portion 32 and the smoothing portion 33 has a gap 40 with the roller 10, and the head 31 extends from the direction close to the guide portion 32 to the direction close to the mounting bracket 20.

That is to say, the head 31 of the limit plate 30 is warped outward relative to the guide portion 32 and the mounting bracket 20, so that even if the pole ear 51 is deformed, it can be smoothly introduced into the gap 40 between the limit plate 30 and the roller 10 under the guidance of the head 31; when the pole ear 51 cuts into the gap 40 between the guide portion 32 and the roller 10, the guide portion 32 can timely suppress the deformation of the pole ear 51, thereby avoiding the problems of edge collapse, crescent marks, folding, etc. of the pole ear 51.

Among them, at least a part of the smoothing portion 33 forms an arc plate portion coaxially arranged with the central axis of the roller 10, so that a gap 40 of a fixed size is defined between the arc plate portion of the smoothing portion 33 and the roller 10, and the smoothing portion 33 can further smooth and correct the pole ear 51.

As shown in FIG. 4 , in some embodiments, a distance H1 between an end of the head portion 31 away from the guide portion 32 and the battery electrode 50 in the thickness direction of the battery electrode 50 is 15 mm to 30 mm. For example, H1 may be 15 mm, 20 mm, 25 mm, 30 mm, etc.

Therefore, by limiting H1 to satisfy the above range, it is further ensured that the deformation of the pole ear 51 can also be smoothly introduced into the gap 40 between the limiting plate 30 and the roller 10 under the guidance of the head 31, thereby timely suppressing the deformation of the pole ear 51 and avoiding the problems of edge collapse, crescent mark, folding, etc. of the pole ear 51.

In some embodiments, the head 31 forms an arc-shaped plate portion, and the radius R of the arc-shaped plate portion is 20 mm-40 mm. For example, the radius R of the arc-shaped plate portion is 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, etc.

Therefore, by limiting the radius R of the arc-shaped plate portion to satisfy the above-mentioned range, it is further ensured that the deformation of the pole ear 51 can also be smoothly introduced into the gap 40 between the limiting plate 30 and the roller 10 under the guidance of the head 31, thereby timely suppressing the deformation of the pole ear 51 and avoiding the problems of edge collapse, crescent marks, folding, etc. of the pole ear 51.

As shown in Figure 4, in some embodiments, the guide portion 32 forms a straight plate portion, the guide portion 32 is arranged parallel to the battery electrode 50, and the distance H between the guide portion 32 and the battery electrode 50 in the thickness direction of the battery electrode 50 is 1mm-2mm. The distance H between the guide portion 32 and the battery electrode 50 in the thickness direction of the battery electrode 50 can be 1mm, 1.5mm, 2mm, etc.

As shown in Fig. 2, in some embodiments, the guide portion 32 is formed into a flat plate portion, and the length L of the guide portion 32 is 20 mm-60 mm. For example, the length L of the guide portion 32 can be 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, etc.

Therefore, by limiting the size of the guide portion 32 to meet the above conditions and combining the size of the head 31, etc., the deformed pole ear 51 can be suppressed and corrected, so that the pole ear 51 can restore its normal shape and improve the collapsed edge, crescent mark and folded pole ear.

Referring to FIG. 5 , and further to FIG. 3 , FIG. 3 is a side view of a roller assembly 100 according to some embodiments of the present application, wherein a battery pole piece 50 is disposed on the roller assembly 100. The outer peripheral wall of the roller 10 has a first peripheral surface 101 and a second peripheral surface 102, the first peripheral surface 101 and the second peripheral surface 102 are arranged along the axial direction of the roller 10, the first peripheral surface 101 is disposed close to the mounting bracket 20, and the first peripheral surface 101 is lower than the second peripheral surface 102, thereby defining a step surface 103 between the first peripheral surface 101 and the second peripheral surface 102, the limiting plate 30 is directly opposite to the first peripheral surface 101, and there is a gap 40 between the limiting plate 30 and the first peripheral surface 101, and the battery pole piece 50 is suitable for matching with the second peripheral surface 102.

Therefore, by setting a step surface 103 on the roller 10, the first circumferential surface 101 can avoid the pole lug 51, so that during the operation of the battery electrode 50, the roller 10 will not deform the pole lug 51, and it can also ensure that the gap 40 between the limiting plate 30 and the roller 10 meets the specific size requirements, so that the limiting plate 30 can suppress and correct the deformed pole lug 51, so that the pole lug 51 can restore its normal morphology, and improve the collapsed edge of the pole lug, the crescent mark, and the folding of the pole lug.

As shown in FIG. 3 , in some embodiments, a distance L1 between the step surface 103 and the root of the pole lug 51 in the axial direction of the roller 10 is 0 mm to 3 mm.

That is to say, the root of the pole lug 51 can be located on the first circumferential surface 101, that is, the root of the pole lug 51 exceeds the step surface 103, the root of the pole lug 51 can also be located on the second circumferential surface 102, that is, the step surface 103 exceeds the root of the pole lug 51, and the root of the pole lug 51 can also be located at a position aligned with the step surface 103.

By limiting the distance L1 between the step surface 103 and the root of the pole ear 51 to meet the above range, it is ensured that the pole ear 51 can extend into the gap 40 between the limiting plate 30 and the roller 10. In this way, the limiting plate 30 can suppress and correct the deformation of the pole ear 51, restore the pole ear 51 to a normal shape, and improve the problems of collapsed edge, crescent mark, folding, etc. of the pole ear 51.

In some embodiments, the height difference L2 between the first circumferential surface 101 and the second circumferential surface 102 is 0.1 mm-0.5 mm. For example, the height difference L2 between the first circumferential surface 101 and the second circumferential surface 102 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc. By limiting the height difference L2 between the first circumferential surface 101 and the second circumferential surface 102 to meet the above-mentioned size requirements, the limiting plate 30 can suppress and correct the deformed tab 51, so that the tab 51 can restore the normal morphology, and improve the tab collapse, crescent mark, and tab folding.

As shown in Figures 4 and 5, in some embodiments, the outer wall of the mounting bracket 20 has an avoidance groove 23, which extends toward the end of the mounting bracket 20 facing away from the battery pole ear to form an opening 24 at the end of the mounting bracket 20, and the avoidance groove 23 connects the opening 24 with the gap 40.

That is to say, the opening 24 can form a visual window. By setting the opening 24 and the avoidance groove 23, the gap 40 can be seen through the opening 24, so that the size between the limit plate 30 and the roller 10 and the battery electrode 50 can be checked through the opening 24, which is not only convenient for installation and debugging, but also convenient for inspection and troubleshooting during work.

The shape of the opening 24 may be semicircular, and correspondingly, the avoidance groove 23 may be formed along the mounting bracket 20. An axially extending arc groove.

In some embodiments, the avoidance grooves 23 include a plurality of avoidance grooves 23 , which are arranged at intervals along the circumference of the mounting bracket 20 . Correspondingly, the openings 24 include a plurality of openings 24 , which are arranged at intervals along the circumference of the mounting bracket 20 .

Therefore, by setting a plurality of openings 24 and a plurality of avoidance grooves 23, the dimensions between the limit plate 30 and the roller 10 and the battery electrode 50 can be checked at different positions, which further facilitates installation, debugging, inspection and troubleshooting during operation.

The winding device according to an embodiment of the present application is described below.

The winding device of the embodiment of the present application includes the roller assembly 100 according to the above embodiment. In the technical solution of the embodiment of the present application, by adopting the above roller assembly 100, the deformation of the pole lug 51 can be suppressed and corrected, so that the pole lug 51 can restore its normal appearance, and improve the problems of the pole lug 51 such as collapsed edge, crescent mark, and folding.

It can be understood that other structures and operations of the winding device according to the embodiment of the present application are known to ordinary technicians in the field and will not be described in detail here.

It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

A roller assembly, comprising:

Roller;

A mounting bracket, the mounting bracket being sleeved on one end of the roller;

A limit plate, wherein the limit plate is arranged on the mounting bracket and at least a part of the limit plate extends along the circumference of the roller, and a gap is provided between the limit plate and the peripheral wall of the roller for the tab of the battery electrode to pass through, and the limit plate is used to limit the tab to control the deformation of the tab;

Wherein, the end of the mounting bracket facing away from the battery electrode sheet has an opening, and the opening is connected to the gap.
The roller assembly according to claim 1, wherein the limiting plate is connected to the mounting bracket on one side in the axial direction of the roller.
The roller assembly according to claim 2, wherein the distance between the root of the pole ear and the limit plate in the axial direction of the roller is greater than 0 mm and less than 10 mm, or equal to 10 mm.
The roller assembly according to claim 2 or 3, wherein the dimension of the limit plate in the axial direction of the roller is 50mm-115mm.
The roller assembly according to any one of claims 2 to 4, wherein the distance between the root of the pole ear and the limit plate in the axial direction of the roller is W, the size of the limit plate in the axial direction of the roller is W1, and the ratio of W1 to W is greater than 5.
According to any one of claims 1-5, the outer peripheral wall of the mounting bracket has a limiting protrusion extending along its circumference, and the limiting plate is in contact with the side wall of the limiting protrusion on one side in the axial direction of the roller.
According to any one of claims 1-6, the outer peripheral wall of the mounting bracket has a plurality of first connecting holes, the limiting plate has a plurality of second connecting holes, the limiting plate and the mounting bracket are connected by a plurality of fasteners, and each of the fasteners is inserted into the corresponding first connecting hole and the second connecting hole.
The roller assembly according to claim 7, wherein a plurality of the second connecting holes are arranged at intervals along the circumference of the roller.
According to any one of claims 1 to 8, the limit plate comprises a head, a guide portion and a smoothing portion, the head, the guide portion and the smoothing portion are arranged in a preset direction and the guide portion is connected between the head and the smoothing portion, and the smoothing portion extends along the circumference of the roller.

There is the gap between each of the guide portion and the smoothing portion and the roller, and the head portion extends from a direction close to the guide portion to a direction close to the mounting bracket.
The roller assembly according to claim 9, wherein the distance between the end of the head portion away from the guide portion and the battery electrode sheet in the thickness direction of the battery electrode sheet is 15 mm-30 mm.
The roller assembly according to claim 9 or 10, wherein the head portion forms an arc-shaped plate portion, and the radius of the arc-shaped plate portion is 20 mm-40 mm.
The roller assembly according to any one of claims 9 to 11, wherein the guide portion forms a straight plate portion, The distance between the guide portion and the battery electrode sheet in the thickness direction of the battery electrode sheet is 1 mm-2 mm; and/or the length of the guide portion is 20 mm-60 mm.
The roller assembly according to any one of claims 9 to 12, wherein the outer peripheral wall of the roller has a first peripheral surface and a second peripheral surface arranged along the axial direction thereof;

Among them, the first circumferential surface is arranged close to the mounting bracket and is lower than the second circumferential surface to define a step surface therebetween, the limiting plate is opposite to the first circumferential surface and there is the gap between the limiting plate and the first circumferential surface, and the battery electrode is suitable for cooperating with the second circumferential surface.
The roller assembly according to claim 13, wherein the distance between the step surface and the root of the pole ear in the axial direction of the roller is 0 to 3 mm.
The roller assembly according to claim 13 or 14, wherein the height difference between the first circumferential surface and the second circumferential surface is 0.1 mm-0.5 mm.
A roller assembly according to any one of claims 1-15, wherein the outer peripheral wall of the mounting bracket has an avoidance groove, the avoidance groove extends toward the end of the mounting bracket facing away from the battery electrode to form the opening at the end of the mounting bracket, and the avoidance groove connects the opening and the gap.
The roller assembly according to claim 16, wherein the avoidance groove comprises a plurality of avoidance grooves, and the plurality of avoidance grooves are arranged at intervals along the circumference of the mounting bracket.
A winding device, comprising a roller assembly according to any one of claims 1-17.