Bending device and battery cell winding equipment

Abstract

The utility model relates to the technical field of battery processing equipment, in particular to a bending device and battery cell winding equipment. A bending device comprises an installation part and a bending part. The first bending mechanism is arranged on the mounting piece; the first bending mechanism is arranged on the mounting part, the second bending mechanism is arranged on the mounting part, the first bending mechanism and the second bending mechanism are sequentially arranged on a conveying path of a pole piece, the first bending mechanism is used for bending a pole lug on the pole piece conveyed by the first bending mechanism for the first time, and the second bending mechanism is used for bending a pole lug on the pole piece conveyed by the second bending mechanism for the second time. And the second bending mechanism is used for carrying out secondary bending on the pole lug on the pole piece passing through the second bending mechanism, and the bending angle after the secondary bending is larger than the bending angle after the primary bending. The bending device provided by the utility model can solve the problem that the tab is easy to tear.

Description

Technical Field

[0001] The present application relates to the technical field of battery processing equipment, and in particular to a bending device and a battery core winding equipment. Background Art

[0002] In a battery core winding equipment, for a pole piece with multiple tabs, in order to facilitate the welding of the tabs, it is usually necessary to bend the tabs on the pole piece through a bending device.

[0003] However, when the bending device in the related art bends the tabs, the tabs are very likely to be torn. Therefore, there is an urgent need for a new bending device to solve the problem that the tabs are easily torn. Summary of the Utility Model

[0004] The present application discloses a bending device and a battery core winding equipment, which can solve the problem that the tabs are easily torn, and the quality of the tabs bent by the bending device is better.

[0005] To achieve the above object, in a first aspect, the present application discloses a bending device, including:

[0006] A mounting member;

[0007] A first bending mechanism, the first bending mechanism is arranged on the mounting member; and,

[0008] A second bending mechanism, the second bending mechanism is arranged on the mounting member and the first bending mechanism and the second bending mechanism are arranged in sequence on the conveying path of the pole piece. The first bending mechanism is used to perform a first bending on the tab on the pole piece passing through the first bending mechanism, and the second bending mechanism is used to perform a second bending on the tab on the pole piece passing through the second bending mechanism. The bending angle after the second bending is greater than the bending angle after the first bending.

[0009] When the tab on the pole piece is bent by the bending device, since the first bending mechanism and the second bending mechanism are arranged in sequence on the conveying path of the pole piece, when the tab follows the pole piece and passes through the first bending mechanism, the first bending mechanism can perform a first bending on the tab on the pole piece. Then, when the tab continues to follow the pole piece and passes through the second bending mechanism, the second bending mechanism can perform a second bending on the tab on the pole piece passing through the second bending mechanism.

[0010] Since the bending angle after the second bending is greater than that after the first bending, the first bending performed by the first bending mechanism on the tab on the pole piece can be understood as a preliminary bending. The bending angle after this preliminary bending is small and does not meet the ideal bending angle required finally. Then, when the tab continues to follow the pole piece and passes through the second bending mechanism, the second bending mechanism can perform a second bending on the tab on the pole piece on the basis of the preliminary bending, so that the bending angle after the second bending is larger than that after the first bending and meets the ideal bending angle required finally.

[0011] It can be seen that when bending the tab on the pole piece to the ideal bending angle, the second bending mechanism can perform a second bending on the tab on the pole piece on the basis of the preliminary bending of the first bending mechanism, so as to achieve the purpose that the bending angle after the second bending meets the ideal bending angle required finally. With such a setting, it only needs to bend the tab on the pole piece by a small angle when looking at the first bending mechanism and the second bending mechanism separately. The sum of the two small angles can obtain an ideal bending angle that meets the final requirements. Compared with the method of directly bending the tab on the pole piece to the ideal bending angle that meets the final requirements in the related art, it can avoid the problem of the tab being torn caused by too large a one-time bending angle to a certain extent, making the quality of the tab bent by this bending device better.

[0012] Optionally, the first bending mechanism includes:

[0013] A first guiding member, the first guiding member is arranged on the mounting member; and,

[0014] A first pre-bending assembly, the first pre-bending assembly is arranged on the mounting member, the first pre-bending assembly includes a first pre-bending member, the first pre-bending member and the first guiding member are oppositely arranged to form a first material-passing gap, the first material-passing gap is located on the conveying path of the pole piece, and the first pre-bending member is used for performing the first bending on the tab on the pole piece passing through the first material-passing gap.

[0015] Optionally, the first bending mechanism further includes:

[0016] A first dust-removing member, the first dust-removing member is used for sucking the dust generated when the first pre-bending member performs the first bending on the tab on the pole piece.

[0017] Optionally, the first guiding member is a first roller, which is rotatably disposed on the mounting member and extends along a first direction, and the first pre-folding member is a first pre-folding roller, which includes a first cylindrical surface and a first conical surface connected in sequence along the first direction, and along the first direction, the cross-sectional size of the first conical surface gradually increases, and at least a portion of the first conical surface exceeds the roller wall of the first roller along the first direction.

[0018] Optionally, the first pre-folding component further includes:

[0019] A first driving member, the first driving member is disposed on the mounting member; and

[0020] A first roller mounting seat, wherein the first pre-folding roller is rotatably disposed on the first roller mounting seat, and the first driving member is used for driving the first roller mounting seat to move toward or away from the first passing roller, so as to drive the first pre-folding roller to move toward or away from the first passing roller.

[0021] Optionally, the first pre-folding component further includes:

[0022] a first adjusting member, the first adjusting member being arranged on the mounting member;

[0023] A first adapter, wherein the first adapter is arranged on the first adjusting member, the first driving member is arranged on the first adapter, and the first adjusting member is used to drive the first adapter to reciprocate along the axial direction of the first pre-folding roller.

[0024] Optionally, the second bending mechanism includes:

[0025] A second roller, the second roller being rotatably disposed on the mounting member and extending along the first direction;

[0026] The second pre-folding roller is opposite to the second passing roller, a second feeding gap is formed between the second pre-folding roller and the second passing roller, the second feeding gap is located on the transmission path of the pole piece, and the second pre-folding roller is used to perform the second bending on the pole ear on the pole piece passing through the second feeding gap.

[0027] Optionally, the second bending mechanism further includes:

[0028] The second dust removal member is used to absorb dust generated when the second pre-folding roller performs the second bending on the pole ear on the pole piece.

[0029] Optionally, the second pre-bending roller includes a second cylindrical surface and a second conical surface that are sequentially connected in the first direction. Along the first direction, the size of the cross-section of the second conical surface gradually increases, and at least a part of the second conical surface extends beyond the roller wall of the second over-roller along the first direction.

[0030] Optionally, the second bending mechanism further includes:

[0031] A second driving member disposed on the mounting member; and,

[0032] A second roller mounting seat, the second pre-bending roller is rotatably disposed on the second roller mounting seat, and the second driving member is used to drive the second roller mounting seat to move toward or away from the second over-roller, so as to drive the second pre-bending roller to move toward or away from the second over-roller.

[0033] Optionally, the second bending mechanism further includes:

[0034] A limiting member connected to the second roller mounting seat; and,

[0035] A blocking assembly disposed on the mounting member and located on the moving track of the limiting member, and the limiting member can abut against the blocking assembly when moving toward the second over-roller.

[0036] Optionally, the blocking assembly includes:

[0037] A third driving member disposed on the mounting member; and,

[0038] An eccentric wheel connected to the rotating shaft of the third driving member, the eccentric wheel is located on the moving track of the limiting member, and the limiting member can abut against the peripheral wall of the eccentric wheel when moving toward the second over-roller.

[0039] Optionally, the second bending mechanism further includes:

[0040] A fourth driving member disposed on the mounting member;

[0041] A second adapter disposed on the fourth driving member;

[0042] The second over-roller is rotatably disposed on the second adapter, the second pre-bending roller is disposed on the second adapter, and the fourth driving member is used to drive the second adapter to move along the first direction, so as to adjust the second material passing gap to the conveying path of the pole piece.

[0043] Optionally, the second bending mechanism further includes:

[0044] A second adjusting member, which is respectively connected to the second pre-bending roller and the second adapter, and is used to drive the second pre-bending roller to reciprocate along the axial direction of the second pre-bending roller.

[0045] In a second aspect, the present application discloses a battery cell winding device, including the bending device described in any one of the above first aspects.

[0046] Compared with the prior art, the beneficial effects of the present application are as follows:

[0047] In the present application, when the ear on the pole piece is bent by the bending device, since the first bending mechanism and the second bending mechanism are sequentially arranged on the conveying path of the pole piece, when the ear follows the pole piece through the first bending mechanism, the first bending mechanism can perform the first bending on the ear on the pole piece. Then, when the ear continues to follow the pole piece through the second bending mechanism, the second bending mechanism can perform the second bending on the ear on the pole piece passing through the second bending mechanism.

[0048] Since the bending angle after the second bending is greater than the bending angle after the first bending, the first bending performed by the first bending mechanism on the ear on the pole piece can be understood as a preliminary bending, and the bending angle after this preliminary bending is small and does not meet the ideal bending angle required finally. Then, when the ear continues to follow the pole piece through the second bending mechanism, the second bending mechanism can perform the second bending on the ear on the pole piece on the basis of the preliminary bending, so that the bending angle after the second bending is larger than the bending angle after the first bending and meets the ideal bending angle required finally.

[0049] It can be seen that when the ear on the pole piece is bent to the ideal bending angle, the second bending mechanism can perform the second bending on the ear on the pole piece on the basis of the preliminary bending of the first bending mechanism to achieve the purpose that the bending angle after the second bending meets the ideal bending angle required finally. With such a setting, it can be seen that the first bending mechanism and the second bending mechanism only need to bend the ear on the pole piece by a small angle separately, and the sum of the two small angles can obtain an ideal bending angle that meets the final requirements. Compared with the method of directly bending the ear on the pole piece to the ideal bending angle that meets the final requirements in the related art, it can avoid the problem of the ear being torn caused by too large a one-time bending angle to a certain extent, and make the quality of the ear bent by the bending device better. Description of the Drawings

[0050] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0051] Figure 1 It is a schematic structural diagram of a bending device provided by an embodiment of the present application;

[0052] Figure 2 is Figure 1 A schematic structural diagram of the pole piece at position C in the negative Z-axis view;

[0053] Figure 3 is Figure 2 The sectional view of the pole piece in along the B-B position (after the tab is bent by the first bending mechanism and the second bending mechanism);

[0054] Figure 4 is Figure 1 The schematic structural diagram of the first pre-bending assembly in ;

[0055] Figure 5 is Figure 1 The schematic structural diagram of the first guide and the first pre-bending piece in ;

[0056] Figure 6 is Figure 1 The schematic structural diagram of the second bending mechanism in ;

[0057] Figure 7 is Figure 1 The schematic structural diagram of the second over-roller and the second pre-bending roller in ;

[0058] Figure 8 is Figure 6 The schematic structural diagram of the second bending mechanism from another perspective in ;

[0059] Figure 9 It is a schematic structural diagram of a battery cell winding device provided by an embodiment of the present application.

[0060] Main reference numeral description

[0061] 1 - Mounting member;

[0062] 2 - First bending mechanism; 21 - First guide; 210 - First material passing gap; 22 - First pre-bending assembly; 221 - First pre-bending piece; 2211 - First cylindrical surface; 2212 - First conical surface; 222 - First driving member; 223 - First roller mounting seat; 224 - First adjusting member; 225 - First adapter; 23 - First dust removing member; 231 - Dust removing cover; 232 - Dust removing pipe;

[0063] 3 - Second bending mechanism; 301 - Second over - roller; 302 - Second pre - folding roller; 3021 - Second cylindrical surface; 3022 - Second conical surface; 303 - Second driving member; 304 - Second roller mounting seat; 305 - Limiting member; 306 - Blocking assembly; 3061 - Third driving member; 3062 - Eccentric wheel; 307 - Fourth driving member; 308 - Second adapter; 3081 - Through - hole; 309 - Second adjusting member; 310 - Third adapter; 3101 - Connecting block; 311 - Second dust removing member; 320 - Second material - passing gap

[0064] 100 - Bending device; 200 - Battery cell winding equipment

[0065] A - Electrode tab; A1 - Tab Detailed implementation manners

[0066] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0067] In the present application, terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0068] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above - mentioned terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to the specific situation.

[0069] In addition, terms such as "installation", "setting", "providing", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above - mentioned terms in the present application can be understood according to the specific situation.

[0070] In addition, terms such as "first", "second", etc. are mainly used to distinguish different devices, components or parts. The specific types and structures may be the same or different, and they are not used to indicate or imply the relative importance and quantity of the indicated devices, components or parts. Unless otherwise specified, the meaning of "a plurality of" is two or more.

[0071] The technical solution of the present application will be further described below in conjunction with specific embodiments and the accompanying drawings.

[0072] See Figure 1 、 Figure 2 and Figure 3 , the bending device 100 includes: a mounting member 1, a first bending mechanism 2 and a second bending mechanism 3. Among them, the first bending mechanism 2 and the second bending mechanism 3 are both arranged on the mounting member 1, and the first bending mechanism 2 and the second bending mechanism 3 are sequentially arranged on the conveying path of the pole piece A. The first bending mechanism 2 is used to perform a first bend on the tab A1 on the pole piece A passing through the first bending mechanism 2, and the second bending mechanism 3 is used to perform a second bend on the tab A1 on the pole piece A passing through the second bending mechanism 3. The bending angle after the second bend is greater than the bending angle after the first bend.

[0073] In this embodiment, when the tab A1 on the pole piece A is bent by the bending device 100, since the first bending mechanism 2 and the second bending mechanism 3 are sequentially arranged on the conveying path of the pole piece A, when the tab A1 follows the pole piece A through the first bending mechanism 2, the first bending mechanism 2 can perform a first bend on the tab A1 on the pole piece A. Then, when the tab A1 continues to follow the pole piece A through the second bending mechanism 3, the second bending mechanism 3 can perform a second bend on the tab A1 on the pole piece A passing through the second bending mechanism 3.

[0074] Since the bending angle after the second bend is greater than the bending angle after the first bend, the first bend performed by the first bending mechanism 2 on the tab A1 on the pole piece A can be understood as a preliminary bend. The bending angle after this preliminary bend is small and does not meet the ideal bending angle required finally. Then, when the tab A1 continues to follow the pole piece A through the second bending mechanism 3, the second bending mechanism 3 can perform a second bend on the tab A1 on the pole piece A on the basis of the preliminary bend, so that the bending angle after the second bend is larger than the bending angle after the first bend and meets the ideal bending angle required finally.

[0075] It can be seen that for the bending device 100 provided in the embodiment of the present application, when bending the tab A1 on the pole piece A to the ideal bending angle, the second bending mechanism 3 can perform a second bending on the tab A1 on the pole piece A on the basis of the preliminary bending of the first bending mechanism 2, so as to achieve the purpose that the bending angle after the second bending meets the ideal bending angle required finally. With such a setting, it can be seen that the first bending mechanism 2 and the second bending mechanism 3 only need to bend the tab A1 on the pole piece A by a relatively small angle separately, and the sum of the two relatively small angles can obtain an ideal bending angle that meets the final requirements. Compared with the method in the related art of directly bending the tab A1 on the pole piece A to the ideal bending angle that meets the final requirements at one time, it can, to a certain extent, avoid the problem that the tab A1 is torn due to too large a bending angle at one time, and make the quality of the tab A1 bent by the bending device 100 better.

[0076] It should be noted that the bending device 100 includes a first bending mechanism 2 and a second bending mechanism 3. The tab A1 on the pole piece A is bent twice by the first bending mechanism 2 and the second bending mechanism 3, which is only a possible implementation manner given in this embodiment. Of course, the bending device 100 may also include a third bending mechanism and a fourth bending mechanism, etc. When the bending device 100 includes a third bending mechanism and a fourth bending mechanism, the tab A1 on the pole piece A can be bent four times by the first bending mechanism 2, the second bending mechanism 3, the third bending mechanism and the fourth bending mechanism, and this embodiment does not make any limitation thereto.

[0077] It should also be noted that the above description that the bending device 100 is used to bend the tab A1 on the pole piece A is only an adaptive description of the function of the bending device 100 based on a specific application scenario in this embodiment. In other application scenarios, the bending device 100 can also be used to bend other products similar in structure to the tab A1 on the pole piece A and requiring bending, and this embodiment does not make any limitation thereto.

[0078] In some embodiments, referring to Figure 1 、 Figure 4 and Figure 5 , the first bending mechanism 2 includes: a first guiding member 21 and a first pre-bending assembly 22. Among them, both the first guiding member 21 and the first pre-bending assembly 22 are arranged on the mounting member 1. The first pre-bending assembly 22 includes a first pre-bending member 221. The first pre-bending member 221 is arranged opposite to the first guiding member 21 to form a first material-passing gap 210. The first material-passing gap 210 is located on the conveying path of the pole piece A. The first pre-bending member 221 is used to perform a first bending on the tab A1 on the pole piece A passing through the first material-passing gap 210.

[0079] Since the first pre-bending member 221 and the first guiding member 21 are oppositely arranged to form a first material passing gap 210, and since the first material passing gap 210 is located on the conveying path of the pole piece A, when the pole piece A is conveyed along the conveying path, the pole piece A will pass through the first material passing gap 210. During the process of the pole piece A passing through the first material passing gap 210, the first pre-bending member 221 can achieve the purpose of performing the first bending on the tab A1 on the pole piece A passing through the first material passing gap 210.

[0080] Wherein, by making the first pre-bending member 221 and the first guiding member 21 oppositely arranged to form the first material passing gap 210, when the first pre-bending member 221 performs the first bending on the tab A1 on the pole piece A passing through the first material passing gap 210, the first pre-bending member 221 and the first guiding member 21 can play a role in limiting the pole piece A, which can avoid or reduce the possibility that the pole piece A shakes or deviates from the conveying path during the process of the first pre-bending member 221 performing the first bending on the tab A1 on the pole piece A, and provides a guarantee for the first pre-bending member 221 to perform the first bending on the tab A1 on the pole piece A.

[0081] Considering that dust will inevitably appear when the first pre-bending member 221 performs the first bending on the tab A1 on the pole piece A, in order to avoid dust from contaminating the pole piece A or the components on the bending device 100, in some embodiments, refer to Figure 4 , the first bending mechanism 2 further includes: a first dust removing member 23, and the first dust removing member 23 is used for sucking the dust generated when the first pre-bending member 221 performs the first bending on the tab A1 on the pole piece A.

[0082] By providing the first dust removing member 23, when dust is generated when the first pre-bending member 221 performs the first bending on the tab A1 on the pole piece A, the first dust removing member 23 can timely suck the dust into the first dust removing member 23, thereby avoiding or reducing the situation that dust contaminates the pole piece A or the components on the bending device 100.

[0083] There are various implementation manners of the above first dust removing member 23. In one possible implementation manner, refer to Figure 4 , the first dust removing member 23 may include a dust removing cover 231 and a dust removing pipe 232. The dust removing cover 231 covers the first pre-bending member 221, and the dust removing pipe 232 is communicated with the dust removing cover 231. In this way, by applying negative pressure to the dust removing pipe 232, the purpose of timely sucking the dust away from the vicinity of the first pre-bending member 221 through the dust removing cover 231 and the dust removing pipe 232 can be achieved.

[0084] Since the dust removal cover 231 covers the first pre-bending member 221, on the one hand, the dust removal cover 231 can prevent dust near the first pre-bending member 221 from spreading everywhere. On the other hand, the dust removal cover 231 can also enhance the suction force of the dust removal pipe 232 on the dust near the first pre-bending member 221. Considering both aspects, by setting the dust removal cover 231, it is possible to better avoid or reduce the situation where dust contaminates the pole piece A or the components on the bending device 100.

[0085] Of course, the first dust removal member 23 can also be realized by other possible means, as long as it can play a role in avoiding or reducing the situation where dust contaminates the pole piece A or the components on the bending device 100. The present embodiment does not limit the first dust removal member 23.

[0086] In some embodiments, referring to Figure 1 and Figure 5 , the first guiding member 21 is a first over-roller, the first over-roller is rotatably arranged on the mounting member 1 and extends along the first direction ( Figure 5 the positive Y-axis direction in

[0087] ). The first pre-bending member 221 is a first pre-bending roller, and the first pre-bending roller includes a first cylindrical surface 2211 and a first conical surface 2212 that are sequentially connected along the first direction. Along the first direction, the cross-sectional dimension of the first conical surface 2212 gradually increases, and at least a part of the first conical surface 2212 extends beyond the roller wall of the first over-roller along the first direction. Since the first guiding member 21 is a first over-roller, the first over-roller is rotatably arranged on the mounting member 1 and extends along the first direction, and the first pre-bending member 221 is a first pre-bending roller, the above-mentioned first material passing gap 210 will be formed relatively by the roller wall of the first over-roller and the roller wall of the first pre-bending roller. In this way, during the process of the pole piece A passing through the first material passing gap 210 along the conveying path, the friction between the pole piece A and the roller walls of the first over-roller and the first pre-bending roller will be rolling friction. Since the friction force of rolling friction is small, to a certain extent, the friction force between the pole piece A and the roller walls of the first over-roller and the first pre-bending roller can be reduced, and thus the situation where the pole piece A is damaged by friction can be avoided.

[0088] In addition, since the cross-sectional dimension of the first conical surface 2212 gradually increases along the first direction, when the tab A1 on the pole piece A passes through the first conical surface 2212, the first conical surface 2212 can bend the tab A1 on the pole piece A in the direction close to the first over-roller. Since at least part of the first conical surface 2212 extends beyond the roller wall of the first over-roller along the first direction, the first conical surface 2212 that extends beyond the roller wall of the first over-roller along the first direction will not be interfered by the roller wall of the first over-roller. In this way, when the first conical surface 2212 bends the tab A1 on the pole piece A in the direction close to the first over-roller, the tab A1 on the pole piece A can freely deform in the direction close to the first over-roller, so that the purpose of first bending the tab A1 on the pole piece A passing through the first feeding gap 210 can be achieved through the first conical surface 2212.

[0089] It can be seen that by setting the first pre-bending roller and making the cross-sectional dimension of the first conical surface 2212 of the first pre-bending roller gradually increase along the first direction, and at least part of the first conical surface 2212 extends beyond the roller wall of the first over-roller along the first direction. During the process that the pole piece A passes through the first feeding gap 210 along the conveying path, the first conical surface 2212 can synchronously achieve the purpose of first bending the tab A1 on the pole piece A. The process of the first bending and the process of conveying the pole piece A can be carried out synchronously without stopping specifically for the work of first bending the tab A1 on the pole piece A. Therefore, the conveying efficiency of the pole piece A can be improved.

[0090] As can be known from the above description, when the pole piece A is conveyed along the conveying path, it needs to pass through the first feeding gap 210. In order to ensure that the pole piece A can easily pass through the first feeding gap 210 when the pole piece A is first loaded onto the bending device 100, see Figure 1 and Figure 4 , the first pre-bending assembly 22 further includes: a first driving member 222. The first driving member 222 is arranged on the mounting member 1. The first pre-bending roller is rotatably arranged on the first roller mounting seat 223. The first driving member 222 is used to drive the first roller mounting seat 223 to move in the direction close to or away from the first over-roller, so as to drive the first pre-bending roller to move in the direction close to or away from the first over-roller.

[0091] Since the first pre-bending roller is rotatably arranged on the first roller mounting seat 223, when the first driving member 222 drives the first roller mounting seat 223 to move in the direction close to or away from the first over-roller, the first pre-bending roller can be synchronously driven to move in the direction close to or away from the first over-roller.

[0092] When the first pre-bending roller moves towards or away from the first over-roller, the width of the first material-passing gap 210 can be adjusted smaller or larger. In this way, when it is necessary to feed the pole piece A onto the bending device 100 for the first time, the first driving member 222 can drive the first roller mounting seat 223 to move away from the first over-roller to increase the width of the first material-passing gap 210, so that the pole piece A can easily pass through the first material-passing gap 210. After the pole piece A passes through the first material-passing gap 210, the first driving member 222 can drive the first roller mounting seat 223 to move towards the first over-roller to decrease the width of the first material-passing gap 210, so as to ensure that the first pre-bending roller can perform the first bending on the tab A1 on the pole piece A.

[0093] In addition, by providing the first driving member 222 and driving the first roller mounting seat 223 to move towards or away from the first over-roller through the first driving member 222, when it is necessary to start the work of performing the first bending on the tab A1 on the pole piece A, the first driving member 222 can drive the first roller mounting seat 223 to move towards the first over-roller. When it is necessary to stop the work of performing the first bending on the tab A1 on the pole piece A, the first driving member 222 can drive the first roller mounting seat 223 to move away from the first over-roller. It can be seen that by providing the first driving member 222, it is possible to freely choose whether to perform the work of performing the first bending on the tab A1 on the pole piece A according to the actual situation, which is very flexible.

[0094] Specifically, when it is necessary to perform the first bending on the tab A1 on the pole piece A, the first driving member 222 can drive the first roller mounting seat 223 to move towards the first over-roller, driving the first pre-bending roller to move towards the first over-roller, making the width of the first material-passing gap 210 narrower, so that the first bending can be performed on the tab A1 on the pole piece A. When it is necessary to stop the work of performing the first bending on the tab A1 on the pole piece A, the first driving member 222 can drive the first roller mounting seat 223 to move away from the first over-roller, driving the first pre-bending roller to move away from the first over-roller, making the width of the first material-passing gap 210 wider, so that the first bending on the tab A1 on the pole piece A can be stopped.

[0095] It should be noted that the above first driving member 222 can include but is not limited to air cylinders or electric cylinders, etc., and this embodiment does not limit this.

[0096] In order to ensure the matching degree in position between the first conical surface 2212 of the first pre-bending roller and the first over-roller, and further ensure that the first conical surface 2212 of the first pre-bending roller can perform the first bending on the tab A1 on the pole piece A passing through the first material-passing gap 210. In some embodiments, see Figure 1 and Figure 4, the first pre-bending assembly 22 further includes: a first adjusting member 224 and a first adapter member 225. Among them, the first adjusting member 224 is disposed on the mounting member 1, the first adapter member 225 is disposed on the first adjusting member 224, the first driving member 222 is disposed on the first adapter member 225, and the first adjusting member 224 is used to drive the first adapter member 225 to reciprocate along the axial direction of the first pre-bending roller ( Figure 4 in the Y-axis direction).

[0097] Since the first adjusting member 224 is disposed on the mounting member 1 and the first adapter member 225 is disposed on the first adjusting member 224, the first adjusting member 224 can drive the first adapter member 225 to reciprocate along the axial direction of the first pre-bending roller.

[0098] Next, since the first driving member 222 is disposed on the first adapter member 225 and the first pre-bending roller is disposed on the first driving member 222 through the first roller mounting seat 223, when the first adjusting member 224 drives the first adapter member 225 to reciprocate along the axial direction of the first pre-bending roller, it can synchronously drive the first pre-bending roller to reciprocate along the axial direction of the first pre-bending roller. That is, the first adjusting member 224 can drive the first pre-bending roller to reciprocate along the axial direction of the first pre-bending roller.

[0099] In this way, when the first adjusting member 224 drives the first pre-bending roller to reciprocate along the axial direction of the first pre-bending roller, the relative position between the first conical surface 2212 of the first pre-bending roller and the first over-roller can be adjusted, so as to better ensure that the lug A1 on the pole piece A can be bent for the first time through the first conical surface 2212, and further avoid the situation of bending errors caused by the poor matching degree of the position between the first conical surface 2212 and the first over-roller.

[0100] Among them, the above-mentioned first adjusting member 224 can be a micrometer adjusting platform or any other possible adjusting member, as long as it can drive the first pre-bending roller to reciprocate along the axial direction of the first pre-bending roller. The present embodiment does not limit the first adjusting member 224.

[0101] In some embodiments, see Figure 1 and Figure 6 , the second bending mechanism 3 includes: a second over-roller 301 and a second pre-bending roller 302. Among them, the second over-roller 301 is rotatably disposed on the mounting member 1 and extends along the first direction ( Figure 6 in the Y-axis direction), the second pre-bending roller 302 is opposite to the second over-roller 301, a second material passing gap 320 is formed between the second pre-bending roller 302 and the second over-roller 301, the second material passing gap 320 is located on the conveying path of the pole piece A, and the second pre-bending roller is used to perform a second bending on the lug A1 on the pole piece A passing through the second material passing gap 320.

[0102] In this embodiment, since the second pre-bending roller 302 and the second passing roller 301 are oppositely arranged to form a second material-passing gap 320, and since the second material-passing gap 320 is located on the transmission path of the pole piece A, when the pole piece A is transmitted along the transmission path, the pole piece A will pass through the second material-passing gap 320. During the process of the pole piece A passing through the second material-passing gap 320, the second pre-bending roller 302 can achieve the purpose of performing a second bending on the tab A1 on the pole piece A passing through the second material-passing gap 320.

[0103] Among them, by arranging the second pre-bending roller 302 and the second passing roller 301 oppositely to form a second material-passing gap 320, when the second pre-bending roller 302 performs a second bending on the tab A1 on the pole piece A passing through the second material-passing gap 320, the second pre-bending roller 302 and the second passing roller 301 can play a role in limiting the pole piece A, and can avoid or reduce the possibility of the pole piece A shaking or deviating from the transmission path during the process of the second pre-bending roller 302 performing a second bending on the tab A1 on the pole piece A, which provides a guarantee for the second pre-bending roller 302 to perform a second bending on the tab A1 on the pole piece A.

[0104] Similar to the inevitable occurrence of dust when the first pre-bending member 221 performs a first bending on the tab A1 on the pole piece A, considering that dust will also inevitably occur when the second pre-bending roller 302 performs a second bending on the tab A1 on the pole piece A, in order to avoid dust from contaminating the pole piece A or the components on the bending device 100, in some embodiments, refer to Figure 6 , the second bending mechanism 3 further includes: a second dust removal member 311, and the second dust removal member 311 is used for sucking the dust generated when the second pre-bending roller 302 performs a second bending on the tab A1 on the pole piece A.

[0105] By arranging the second dust removal member 311, when dust is generated when the second pre-bending roller 302 performs a second bending on the tab A1 on the pole piece A, the second dust removal member 311 can timely suck the dust into the second dust removal member 311, thereby avoiding or reducing the situation that dust contaminates the pole piece A or the components on the bending device 100.

[0106] Among them, the specific structure of the second dust removal member 311 can be similar to the structure of the above-mentioned first dust removal member 23, and specifically, reference can be made to the description of the first dust removal member 23 in the above embodiment, which will not be elaborated herein.

[0107] In some embodiments, refer to Figure 6 and Figure 7, the second pre-bending roller 302 includes a second cylindrical surface 3021 and a second conical surface 3022 that are sequentially connected in the first direction. Along the first direction, the cross-sectional dimension of the second conical surface 3022 gradually increases, and at least a part of the second conical surface 3022 extends beyond the roller wall of the second over-roller 301 in the first direction. Wherein, the inclination angle of the second conical surface 3022 is greater than the inclination angle of the first conical surface 2212, and the first conical surface 2212 and the second conical surface 3022 are located on the same side of the tab A1 in the thickness direction.

[0108] Wherein, when the second pre-bending roller 302 includes a second cylindrical surface 3021 and a second conical surface 3022 that are sequentially connected in the first direction, the principle of using the second conical surface 3022 to perform the second bending on the tab A1 on the pole piece A is similar to the principle of using the first conical surface 2212 to perform the first bending on the tab A1 on the pole piece A. For specific details, reference can be made to the description in the above embodiments, and details will not be elaborated in this embodiment.

[0109] Since the inclination angle of the second conical surface 3022 is greater than the inclination angle of the first conical surface 2212, the bending angle after the second bending of the tab A1 by the second conical surface 3022 will be greater than the bending angle after the first bending of the tab A1 by the first conical surface 2212. Thus, the purpose of bending the tab A1 on the pole piece A to an ideal bending angle that meets the final requirements through two bends can be achieved.

[0110] In some embodiments, referring to Figure 6 , the second bending mechanism 3 further includes: a second driving member 303 and a second roller mounting seat 304. Wherein, the second driving member 303 is arranged on the mounting member 1, the second pre-bending roller 302 is rotatably arranged on the second roller mounting seat 304, and the second driving member 303 is used to drive the second roller mounting seat 304 to move towards or away from the second over-roller 301, so as to drive the second pre-bending roller 302 to move towards or away from the second over-roller 301.

[0111] By setting the second driving member 303, since the second driving member 303 can drive the second roller mounting seat 304 to move towards or away from the second over-roller 301, and further drive the second pre-bending roller 302 to move towards or away from the second over-roller 301. Therefore, similar to the beneficial effects brought by the first driving member 222 driving the first roller mounting seat 223 to move towards or away from the first over-roller, on the one hand, it can ensure that when the pole piece A is first fed into the bending device 100, the pole piece A can easily pass through the second feeding gap 320 between the second pre-bending roller 302 and the second over-roller 301. On the other hand, it can also freely choose whether to perform the second bending operation on the tab A1 on the pole piece A according to the actual situation, which is very flexible.

[0112] Among them, similar to the first driving member 222, the second driving member 303 may include, but is not limited to, a cylinder or an electric cylinder, etc., and this embodiment does not limit this.

[0113] In order to prevent the second driving member 303 from driving the second roller mounting seat 304 to move towards the second over-roller 301 with an excessive moving stroke, resulting in the width of the second material-passing gap 320 between the second pre-bending roller 302 and the second over-roller 301 being too narrow, in some embodiments, referring to Figure 6 , the second bending mechanism 3 further includes: a limiting member 305 and a blocking assembly 306. Among them, the limiting member 305 is connected to the second roller mounting seat 304, the blocking assembly 306 is arranged on the mounting member 1 and is located on the moving track of the limiting member 305, and the limiting member 305 can abut against the blocking assembly 306 when moving towards the second over-roller 301 ( Figure 6 the positive Z-axis direction in

[0114] Since the limiting member 305 is connected to the second roller mounting seat 304, when the second driving member 303 drives the second roller mounting seat 304 to move towards the second over-roller 301, and then drives the second pre-bending roller 302 to move towards the second over-roller 301, the limiting member 305 can be synchronously driven to move towards the second over-roller 301.

[0115] Since the blocking assembly 306 is arranged on the mounting member 1 and is located on the moving track of the limiting member 305, when the limiting member 305 moves towards the second over-roller 301, it can abut against the blocking assembly 306. In this way, the blocking assembly 306 can prevent the limiting member 305 from continuing to move towards the second over-roller 301, and further can achieve the purpose of preventing the second pre-bending roller 302 from continuing to move towards the second over-roller 301, thereby avoiding the situation where the width of the second material-passing gap 320 between the second pre-bending roller 302 and the second over-roller 301 is too narrow.

[0116] Among them, the above-mentioned limiting member 305 can be a plate-like structure as shown in Figure 6 . Of course, the limiting member 305 can also be a structure with other shapes, and this embodiment does not limit this.

[0117] In order to make the limiting degree of the blocking assembly 306 on the limiting member 305 adjustable, in some embodiments, referring to Figure 6 , the blocking assembly 306 includes: a third driving member 3061 and an eccentric wheel 3062. Among them, the third driving member 3061 is arranged on the mounting member 1, the eccentric wheel 3062 is connected to the rotating shaft of the third driving member 3061, the eccentric wheel 3062 is located on the moving track of the limiting member 305, and the limiting member 305 moves towards the second over-roller 301 ( Figure 6When moving in the positive direction of the Z-axis), it can abut against the peripheral wall of the eccentric wheel 3062.

[0118] Since the eccentric wheel 3062 is connected to the rotation axis of the third driving member 3061, when the rotation axis of the third driving member 3061 starts to rotate, the eccentric wheel 3062 can be driven to rotate synchronously. In this way, when the peripheral wall of the eccentric wheel 3062 abuts against the limiting member 305, as the eccentric wheel 3062 rotates, the maximum distance between the peripheral wall of the eccentric wheel 3062 and the second over-roller 301 will change, and further the maximum stroke that the limiting member 305 can move toward the second over-roller 301 can change, so that the purpose of adjustable limiting degree of the blocking assembly 306 on the limiting member 305 can be achieved.

[0119] By making the limiting degree of the blocking assembly 306 on the limiting member 305 adjustable, the width of the second material-passing gap 320 can be flexibly adjusted as needed, making the bending device 100 more practical and having a wider application range.

[0120] Among them, the above-mentioned third driving member 3061 can include but is not limited to a motor, and this embodiment does not limit this.

[0121] Considering that in the actual application scenario of the bending device 100, the second material-passing gap 320 may deviate from the conveying path along the first direction ( Figure 1 in the Y-axis direction of the middle), resulting in the second conical surface 3022 of the second pre-bending roller 302 not being able to match well with the tab A1 on the pole piece A during the process of the pole piece A passing through the second material-passing gap 320. In some embodiments, see Figure 6 , the second bending mechanism 3 further includes: a fourth driving member 307 and a second adapter 308. The fourth driving member 307 is arranged on the mounting member 1, and the second adapter 308 is arranged on the fourth driving member 307. The second over-roller 301 is rotatably arranged on the second adapter 308, and the second pre-bending roller 302 is arranged on the second adapter 308. The fourth driving member 307 is used to drive the second adapter 308 to move along the first direction to adjust the second material-passing gap 320 onto the conveying path of the pole piece A.

[0122] Since the fourth driving member 307 is arranged on the mounting member 1 and the second adapter 308 is arranged on the fourth driving member 307, the fourth driving member 307 can drive the second adapter 308 to move along the first direction. When the second adapter 308 moves along the first direction, since the second over-roller 301 is rotatably arranged on the second adapter 308 and the second pre-bending roller 302 is arranged on the second adapter 308, the second over-roller 301 and the second pre-bending roller 302 as a whole can be driven to move along the first direction, and further the second material-passing gap 320 between the second over-roller 301 and the second pre-bending roller 302 can move along the first direction.

[0123] On the basis that the fourth driving member 307 can drive the second material passing gap 320 between the second over roller 301 and the second pre-folding roller 302 to move along the first direction, when the second material passing gap 320 deviates from the conveying path along the first direction ( Figure 1 the Y-axis direction in it), the fourth driving member 307 can be used to drive the second material passing gap 320 between the second over roller 301 and the second pre-folding roller 302 to move along the first direction for deviation correction, so as to avoid the situation that the second conical surface 3022 of the second pre-folding roller 302 cannot be well matched with the tab A1 in position during the process of the pole piece A passing through the second material passing gap 320.

[0124] Among them, the above-mentioned fourth driving member 307 can include but is not limited to a motor, and this embodiment does not limit this.

[0125] In addition, there are various implementation manners for rotatably arranging the second over roller 301 on the second adapter 308. For example, in one possible implementation manner, the second over roller 301 can be rotatably arranged on the second adapter 308 through a bearing seat. Of course, it can also be rotatably arranged on the second adapter 308 through other means, and this embodiment will not list them one by one here.

[0126] In some embodiments, referring to Figure 6 , the second bending mechanism 3 further includes: a second adjusting member 309, the second adjusting member 309 is respectively connected to the second pre-folding roller 302 and the second adapter 308, and the second adjusting member 309 is used to drive the second pre-folding roller 302 to reciprocate along the axial direction of the second pre-folding roller 302 ( Figure 6 the Y-axis direction in it).

[0127] Since the second adjusting member 309 is respectively connected to the second pre-folding roller 302 and the second adapter 308, the second adjusting member 309 can drive the second pre-folding roller 302 to reciprocate along the axial direction of the second pre-folding roller 302.

[0128] When the second pre-folding roller 302 reciprocates along the axial direction of the second pre-folding roller 302, the relative position between the second conical surface 3022 of the second pre-folding roller 302 and the second over roller 301 can be adjusted, so as to better ensure that the tab A1 on the pole piece A can be secondarily bent through the second conical surface 3022, and the situation of bending errors caused by poor positional matching between the second conical surface 3022 and the second over roller 301 can be avoided.

[0129] Among them, there are various implementation manners for the above-mentioned second adjusting member 309. In one possible implementation manner, the second adjusting member 309 can be a micrometer adjusting platform. In another possible implementation manner, referring toFigure 6 and Figure 8 The second adjusting member 309 is an adjusting screw. The second bending mechanism 3 further includes a third adapter 310. The second pre-bending roller 302 is disposed on the third adapter 310. The adjusting screw extends along the axial direction of the second pre-bending roller 302 ( Figure 8 the X-axis direction in

[0130] ), and is rotatably disposed on the second adapter 308 around the axis of the adjusting screw. The third adapter 310 is slidably disposed on the second adapter 308 along the axial direction of the second pre-bending roller 302. A connecting block 3101 is connected to the third adapter 310. The screw of the adjusting screw is threadedly connected to the connecting block 3101.

[0131] In some embodiments, referring to Figure 6 and Figure 8 ), the adjusting screw is located on the side of the second adapter 308 away from the third adapter 310. A through hole 3081 is provided on the second adapter 308. The connecting block 3101 passes through the through hole 3081 to the side of the second adapter 308 away from the third adapter 310 and is threadedly connected to the screw of the adjusting screw.

[0132] Since the adjusting screw is located on the side of the second adapter 308 away from the third adapter 310, and the connecting block 3101 passes through the through hole 3081 to the side of the second adapter 308 away from the third adapter 310 and is threadedly connected to the screw of the adjusting screw, the third adapter 310 and the adjusting screw can be respectively located on both sides of the second adapter 308. In this way, the space on both sides of the second adapter 308 can be fully utilized, so that the structure of the entire bending device 100 can be made more compact and the volume can be made smaller to a certain extent.

[0133] The present application further provides a battery cell winding device 200. Referring to Figure 9 ), the battery cell winding device 200 includes a bending device 100.

[0134] Among them, the structure of the bending device 100 can be the same as that of the bending device 100 in the above embodiment, and can bring the same or similar beneficial effects. For details, reference can be made to the description of the bending device 100 in the above embodiment, which will not be repeated in this embodiment.

[0135] In this embodiment, since the quality of the tab A1 bent by the bending device 100 is good, when the battery core winding device 200 includes the bending device 100, the quality of the battery core wound by the battery core winding device 200 can be better.

[0136] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A bending device (100), characterized in that, Including: Mounting member (1); First bending mechanism (2), the first bending mechanism (2) is arranged on the mounting member (1); and, Second bending mechanism (3), the second bending mechanism (3) is arranged on the mounting member (1) and the first bending mechanism (2) and the second bending mechanism (3) are arranged in sequence on the conveying path of the pole piece (A). The first bending mechanism (2) is used for performing a first bend on the tab (A1) on the pole piece (A) passing through the first bending mechanism (2), and the second bending mechanism (3) is used for performing a second bend on the tab (A1) on the pole piece (A) passing through the second bending mechanism (3). The bending angle after the second bend is greater than the bending angle after the first bend.

2. The bending device (100) according to claim 1, characterized in that, The first bending mechanism (2) includes: First guiding member (21), the first guiding member (21) is arranged on the mounting member (1); and, First pre-bending assembly (22), the first pre-bending assembly (22) is arranged on the mounting member (1). The first pre-bending assembly (22) includes a first pre-bending member (221). The first pre-bending member (221) and the first guiding member (21) are oppositely arranged to form a first material-passing gap (210). The first material-passing gap (210) is located on the conveying path of the pole piece (A). The first pre-bending member (221) is used for performing the first bend on the tab (A1) on the pole piece (A) passing through the first material-passing gap (210).

3. The bending device (100) according to claim 2, wherein, The first bending mechanism (2) further includes: First dust-removing member (23), the first dust-removing member (23) is used for sucking the dust generated when the first pre-bending member (221) performs the first bend on the tab (A1) on the pole piece (A).

4. The bending device (100) according to claim 2 or 3, characterized in that, The first guiding member (21) is a first over-roller. The first over-roller is rotatably arranged on the mounting member (1) and extends along a first direction. The first pre-bending member (221) is a first pre-bending roller. The first pre-bending roller includes a first cylindrical surface (2211) and a first conical surface (2212) connected in sequence along the first direction. Along the first direction, the cross-sectional dimension of the first conical surface (2212) gradually increases, and at least part of the first conical surface (2212) extends beyond the roller wall of the first over-roller along the first direction.

5. The bending device (100) according to claim 4, characterized in that, The first pre-bending assembly (22) further includes: First driving member (222), the first driving member (222) is arranged on the mounting member (1); and, First roller mounting seat (223), the first pre-bending roller is rotatably arranged on the first roller mounting seat (223). The first driving member (222) is used for driving the first roller mounting seat (223) to move towards or away from the first over-roller, so as to drive the first pre-bending roller to move towards or away from the first over-roller.

6. The bending device (100) according to claim 5, characterized in that, The first pre-bending assembly (22) further includes: First adjusting member (224), the first adjusting member (224) is arranged on the mounting member (1); The first adapter (225), the first adapter (225) is disposed on the first adjusting member (224), the first driving member (222) is disposed on the first adapter (225), and the first adjusting member (224) is configured to drive the first adapter (225) to reciprocate axially along the first pre-folding roller.

7. The bending device (100) according to any one of claims 1-3 or 5-6, characterized in that, The second bending mechanism (3) includes: A second over-roller (301), the second over-roller (301) is rotatably disposed on the mounting member (1) and extends along a first direction; A second pre-folding roller (302), the second pre-folding roller (302) is opposite to the second over-roller (301), a second material-passing gap (320) is formed between the second pre-folding roller (302) and the second over-roller (301), the second material-passing gap (320) is located on the conveying path of the pole piece (A), and the second pre-folding roller is configured to perform the second bending on the tab (A1) on the pole piece (A) passing through the second material-passing gap (320).

8. The bending device (100) according to claim 7, wherein, The second bending mechanism (3) further includes: A second dust removing member (311), the second dust removing member (311) is configured to suck the dust generated when the second pre-folding roller (302) performs the second bending on the tab (A1) on the pole piece (A).

9. The bending device (100) according to claim 7, characterized in that, The second pre-folding roller (302) includes a second cylindrical surface (3021) and a second conical surface (3022) sequentially connected along the first direction. Along the first direction, the size of the cross-section of the second conical surface (3022) gradually increases, and at least a part of the second conical surface (3022) extends beyond the roller wall of the second over-roller (301) along the first direction.

10. The bending device (100) according to claim 7, characterized in that, The second bending mechanism (3) further includes: A second driving member (303), the second driving member (303) is disposed on the mounting member (1); and, A second roller mounting seat (304), the second pre-folding roller (302) is rotatably disposed on the second roller mounting seat (304), and the second driving member (303) is configured to drive the second roller mounting seat (304) to move toward or away from the second over-roller (301), so as to drive the second pre-folding roller (302) to move toward or away from the second over-roller (301).

11. The bending device (100) according to claim 10, characterized in that, The second bending mechanism (3) further includes: A limiting member (305), the limiting member (305) is connected to the second roller mounting seat (304); and, A blocking assembly (306), the blocking assembly (306) is disposed on the mounting member (1) and is located on the moving track of the limiting member (305), and the limiting member (305) can abut against the blocking assembly (306) when moving toward the second over-roller (301).

12. The bending device (100) according to claim 11, characterized in that, The blocking assembly (306) includes: A third driving member (3061), the third driving member (3061) is disposed on the mounting member (1); and, An eccentric wheel (3062), the eccentric wheel (3062) is connected to the rotation axis of the third driving member (3061), the eccentric wheel (3062) is located on the movement track of the limiting member (305), and when the limiting member (305) moves towards the direction close to the second over-roller (301), it can abut against the circumferential wall of the eccentric wheel (3062).

13. The bending device (100) according to claim 7, characterized in that, The second bending mechanism (3) further includes: A fourth driving member (307), the fourth driving member (307) is arranged on the mounting member (1); A second adapter (308), the second adapter (308) is arranged on the fourth driving member (307); The second over-roller (301) is rotatably arranged on the second adapter (308), the second pre-bending roller (302) is arranged on the second adapter (308), and the fourth driving member (307) is used to drive the second adapter (308) to move along the first direction to adjust the second material passing gap (320) onto the conveying path of the pole piece (A).

14. The bending device (100) according to claim 13, characterized in that, The second bending mechanism (3) further includes: A second adjusting member (309), the second adjusting member (309) is respectively connected to the second pre-bending roller (302) and the second adapter (308), and the second adjusting member (309) is used to drive the second pre-bending roller (302) to reciprocate along the axial direction of the second pre-bending roller (302).

15. A battery cell winding device (200), characterized in that, Including the bending device (100) according to any one of claims 1-14.

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