Pole lug flattening mechanism, roller passing assembly and pole piece unwinding device

Abstract

The utility model relates to a pole lug flattening mechanism, a roller passing assembly and a pole piece unwinding device. The pole lug flattening mechanism comprises a rotating assembly and a servo assembly. And a pole piece material belt unwound by the unwinding shaft passes through the pole lug flattening mechanism before winding through the roller. When the diameter of the pole piece material roll on the unwinding shaft changes and the wrap angle between the pole piece material belt and the passing roller changes, the servo assembly can drive the swing frame to rotate according to the deflection angle of the pole piece material belt so that the abutting piece can abut against the pole piece material belt. Under the driving of the servo assembly, the abutting piece can swing along with the pole piece material belt. Due to the fact that the relative positions of the swing frame, the abutting piece and the smoothing piece are fixed, under the condition that the abutting piece keeps abutting against the pole piece material belt, the angle of the pole piece material belt penetrating through the smoothing piece does not change. Therefore, the pole piece material belt can penetrate through the smoothing piece at the preset angle all the time in the unwinding process, and the pole lug smoothing effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery equipment technical field especially relates to a tab smoothing mechanism, passes through roller subassembly and pole piece unwinding device. BACKGROUND

[0002] In the pole piece unwinding process, due to the influence of various factors, the tab is prone to folding, thereby affecting the subsequent production efficiency and product quality. In order to avoid the problem of tab folding during unwinding, a smoothing plate is generally arranged at the first roller of the pole piece running to guide and smooth the tab. However, the diameter of the pole piece roll changes in real time during the unwinding process, thereby changing the running direction of the pole piece, while the angle of the smoothing plate is usually fixed, which causes the pole piece to pass through the smoothing plate at an inappropriate angle, thereby resulting in poor or even ineffective tab smoothing effect. SUMMARY

[0003] Therefore, it is necessary to provide a tab smoothing mechanism, a roller assembly and a pole piece unwinding device capable of improving the tab smoothing effect during the unwinding process.

[0004] A tab smoothing mechanism, comprising:

[0005] A rotating assembly, comprising a swing frame, a holding piece and a smoothing piece, the swing frame is rotatably arranged around a swing axis, the holding piece and the smoothing piece are installed on the swing frame; and

[0006] A servo assembly is in transmission connection with the swing frame, the servo assembly can drive the swing frame to rotate to drive the holding piece to abut against the pole piece material belt passing through the tab smoothing mechanism.

[0007] In one embodiment, the swing frame includes a first swing arm and a second swing arm, the first swing arm and the second swing arm are spaced apart along the extension direction of the swing axis and can be synchronously rotated around the swing axis, and the holding piece and the smoothing piece are distributed between the first swing arm and the second swing arm.

[0008] In one embodiment, the holding piece is a compression roller rotatably installed on the swing frame, and the rotation axis of the compression roller is parallel to the swing axis.

[0009] In one embodiment, the position of the smoothing piece on the swing frame is adjustable in the direction parallel to the swing axis.

[0010] In one embodiment, the rotating assembly further includes a support plate installed on the swing frame, the support plate is provided with a mounting groove extending in the direction parallel to the swing axis, and the smoothing piece is installed in the mounting groove.

[0011] In one of the embodiments, the torque applied to the swing frame by the servo assembly is less than or equal to a threshold value.

[0012] In one of the embodiments, the servo assembly comprises an origin sensor, and the rotation assembly further comprises a positioning reference mounted to the swing frame, and the origin sensor is capable of cooperating with the positioning reference to obtain the rotation angle of the swing frame.

[0013] In one of the embodiments, the servo assembly comprises a servo motor, and the servo motor is configured as an absolute value motor.

[0014] A roller assembly comprises a roller and the tab flattening mechanism according to any one of the above preferred embodiments, and the swing axis is aligned with the extension direction of the rotation axis of the roller.

[0015] In one of the embodiments, the roller is mounted to a fixed mandrel and is rotatable about the axis of the fixed mandrel, and the tab flattening mechanism is mounted to the fixed mandrel and makes the swing axis coincide with the rotation axis of the roller.

[0016] In one of the embodiments, the swing frame is arranged on the fixed mandrel.

[0017] In one of the embodiments, the tab flattening mechanism comprises a mounting seat, the mounting seat comprises a fixing ring and a mounting plate connected to the fixing ring, the fixing ring is sleeved and fixed to the fixed mandrel, and the mounting plate has a fixing hole concentric with the fixed mandrel, the rotation assembly comprises a drive shaft fixedly connected to the swing frame, the drive shaft is rotatably mounted to the fixing hole through a bearing, and the servo assembly is connected to the drive shaft.

[0018] In one of the embodiments, a mounting bracket is further provided, and the swing frame is mounted to the mounting bracket and makes the swing axis coincide with the rotation axis of the roller.

[0019] A tab unwinding device comprises an unwinding shaft and a roller assembly according to any one of the above preferred embodiments, and the tab flattening mechanism is located between the unwinding shaft and the roller, and the swing axis is aligned with the extension direction of the rotation axes of the roller and the unwinding shaft.

[0020] In one of the embodiments, the abutting member is a compression roller rotatably mounted to the swing frame, the unwinding shaft rotates in the clockwise direction to unwind the tab material belt, the roller rotates in the clockwise direction under the driving of the tab material belt, and the compression roller rotates in the clockwise or counterclockwise direction under the driving of the tab material belt.

[0021] In one of the embodiments, the abutting member is a pressure roller rotatably mounted on the swing frame, the unwinding shaft rotates in the clockwise direction to unwind the pole piece tape, the passing roller rotates in the counterclockwise direction under the driving of the pole piece tape, and the pressure roller rotates in the clockwise or counterclockwise direction under the driving of the pole piece tape.

[0022] In one of the embodiments, the abutting member is a pressure roller rotatably mounted on the swing frame, the unwinding shaft rotates in the counterclockwise direction to unwind the pole piece tape, the passing roller rotates in the clockwise direction under the driving of the pole piece tape, and the pressure roller rotates in the clockwise or counterclockwise direction under the driving of the pole piece tape.

[0023] In one of the embodiments, the abutting member is a pressure roller rotatably mounted on the swing frame, the unwinding shaft rotates in the counterclockwise direction to unwind the pole piece tape, the passing roller rotates in the counterclockwise direction under the driving of the pole piece tape, and the pressure roller rotates in the clockwise or counterclockwise direction under the driving of the pole piece tape.

[0024] The pole piece unwinding device and the tab flattening mechanism, the pole piece tape unwound by the unwinding shaft passes through the tab flattening mechanism before passing through the passing roller. When the diameter of the pole piece tape roll on the unwinding shaft changes and causes the wrap angle between the pole piece tape and the passing roller to change, the servo assembly can drive the swing frame to rotate according to the deflection angle of the pole piece tape, so that the abutting member keeps abutting with the pole piece tape. Under the driving of the servo assembly, the abutting member can follow the swing of the pole piece tape. Since the relative positions of the swing frame, the abutting member and the flattening member are fixed, the angle of the pole piece tape passing through the flattening member does not change when the abutting member keeps abutting with the pole piece tape. Therefore, the pole piece tape can always pass through the flattening member at a preset angle during unwinding, thereby improving the effect of tab flattening. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0026] Figure 1 It is a simplified structure schematic diagram of the pole piece unwinding device in one embodiment of the present application.

[0027] Figure 2 It is a simplified structure schematic diagram of the pole piece unwinding device in one embodiment of the present application. Figure 1 It is a schematic diagram of another working condition of the pole piece unwinding device shown in the figure.

[0028] Figure 3This is a schematic diagram showing the positional relationship between the tab smoothing mechanism and the roller under a specific working condition.

[0029] Figure 4 This is a schematic diagram showing the positional relationship between the tab smoothing mechanism and the roller under another operating condition.

[0030] Figure 5 This is a front view of the tab smoothing mechanism in one embodiment of the present invention;

[0031] Figure 6 for Figure 5 The right side view of the electrode smoothing mechanism shown;

[0032] Figure 7 for Figure 5 The diagram shows the interaction between the smoothing component and the electrode strip in the electrode smoothing mechanism. Detailed Implementation

[0033] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In the utility model, unless another definite provision and limitation, the terms "mount", "connect", "joint", "fix" and so on should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated; can be mechanical connection, also can be electrical connection; can be direct connection, also can be indirect connection through intermediate medium, can be the intercommunication of two elements or the interaction of two elements, unless another definite limitation. For the ordinary skill in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0037] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "over", "above" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or it simply means that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "on" the second feature can be that the first feature is directly below or obliquely below the second feature, or it simply means that the first feature is lower in horizontal height than the second feature.

[0038] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0039] Please refer to Figure 1 and Figure 2 The utility model provides a kind of pole piece unwinding device 10 and tab smoothing mechanism 100.Therein, the pole piece unwinding device 10 described above includes tab smoothing mechanism 100, unwinding shaft 200 and over roller 300.

[0040] Pole piece material roll 20 can be preloaded on unwinding shaft 200, and continuous pole piece material belt 30 is unwound from unwinding shaft 200 in sequence. Pole piece material belt 20 can be conveyed to the next process in the preset direction after winding over roller 300 and being guided by over roller 300. Tab smoothing mechanism 100 is located between unwinding shaft 200 and over roller 300, and pole piece material belt 30 unwound from unwinding shaft 200 will pass through tab smoothing mechanism 100 before winding over roller 300, and the tab 31 with folded edge of pole piece material belt 30 is smoothed by tab smoothing mechanism 100.

[0041] Pole piece material belt 20 exists in a variety of working conditions when winding over roller 300, and one of them is as followsFigure 1 As shown, the rotation direction of the passing roller 300 is opposite to that of the unwinding shaft 200. The unwinding shaft 200 rotates in the counterclockwise direction to unwind the pole piece tape, and the passing roller 300 rotates in the counterclockwise direction under the driving of the pole piece tape. Alternatively, the unwinding shaft 200 rotates in the clockwise direction to unwind the pole piece tape, and the passing roller 300 rotates in the clockwise direction under the driving of the pole piece tape. Another embodiment is shown in FIG. 2B. Figure 2 As shown, the rotation direction of the passing roller 300 is opposite to that of the unwinding shaft 200. The unwinding shaft 200 rotates in the counterclockwise direction to unwind the pole piece tape, and the passing roller 300 rotates in the counterclockwise direction under the driving of the pole piece tape. Alternatively, the unwinding shaft 200 rotates in the clockwise direction to unwind the pole piece tape, and the passing roller 300 rotates in the clockwise direction under the driving of the pole piece tape. Another embodiment is shown in FIG. 2B.

[0042] As the unwinding process continues, the diameter of the pole piece tape roll 20 will gradually decrease, resulting in a change in the wrap angle between the pole piece tape 30 and the passing roller 300. In order to ensure smooth flattening of the pole tab 31, the pole tab flattening mechanism 100 in the present application is designed to dynamically adjust the direction of the pole tab flattening mechanism 100 to follow the direction of the pole piece tape 30, so that the pole piece tape 30 can always pass through the pole tab flattening mechanism 100 at a preset angle.

[0043] It should be noted that the utility model also provides a passing roller assembly (not marked in the figure), which comprises the pole tab flattening mechanism 100 and the passing roller 300. The pole tab flattening mechanism 100 and the passing roller 300 can be integrated and can be used as a whole to cooperate with different unwinding shafts 200 to achieve unwinding of the pole piece tape 30.

[0044] Please refer to Figure 5 and Figure 6 , the pole tab flattening mechanism 100 in an embodiment of the utility model comprises a rotating assembly 110 and a servo assembly 120.

[0045] The rotating assembly 110 comprises a swing frame 111, a bearing piece 112 and a flattening piece 113, and the bearing piece 112 and the flattening piece 113 are both installed on the swing frame 111. The swing frame 111 serves as a support and can be formed of a metal material. The swing frame 111 is rotatably arranged around a swing axis, and the swing frame 111 can drive the bearing piece 112 and the flattening piece 113 to rotate synchronously by rotating around the swing axis.

[0046] The swing axis is consistent with the extension direction of the rotation axis of the passing roller 300 and the unwinding shaft 200. Specifically, in the embodiment, the unwinding shaft 200 is mounted on the fixed mandrel 310 and can rotate around the axis of the fixed mandrel 310, and the tab flattening mechanism 100 is provided, and the swing axis is coincident with the rotation axis of the passing roller 300. That is, the tab flattening mechanism 100 and the passing roller 300 share the fixed mandrel 310 support structure, so that the overall structure is more compact.

[0047] More specifically, the swing frame 111 is provided on the fixed mandrel 310 and can rotate around the axis of the fixed mandrel 310, so that the swing axis is coincident with the rotation axis of the passing roller 300. The swing frame 111 can be directly mounted with the fixed mandrel 310, or indirectly mounted with the fixed mandrel 310 through other elements.

[0048] Of course, in other embodiments, the swing frame 111 can also be mounted through another mounting bracket (not shown), and the swing axis passes through the mounting bracket and is coincident with the rotation axis of the passing roller 300. Because the mounting bracket is additionally provided, the operation space is larger, and assembly and maintenance are facilitated.

[0049] The abutting member 112 can abut against the tab material belt 30 passing through the tab flattening mechanism 100, and make the tab material belt 30 pass through the flattening member 113 at a predetermined angle. Specifically, in the embodiment, the abutting member 112 is a compression roller rotatably mounted on the swing frame 111, and the rotation axis of the compression roller is parallel to the swing axis. During the process of the tab material belt 30 passing through the tab flattening mechanism 100, the compression roller can be rotated, and the compression roller and the tab material belt 30 are in rolling friction, so that the friction between the abutting member 112 and the tab material belt 30 can be significantly reduced, thereby avoiding causing greater damage to the tab material belt 30.

[0050] It should be pointed out that, in other embodiments, the abutting member 112 can also adopt a spherical metal block, a cylindrical rod, etc., as long as it can abut against the tab material belt 30 and does not damage the tab material belt 30.

[0051] The tab material belt 30 has two position conditions when passing through the tab flattening mechanism 100 and the passing roller 300. One position condition is shown in FIG. 6, in which the tab material belt 30 simultaneously passes through the same side of the passing roller 300 and the abutting member 112; and the other position condition is shown in FIG. 7, in which the tab material belt 30 passes through between the passing roller 300 and the abutting member 112. Figure 3 Figure 4 The tab material belt 30 has two position conditions when passing through the tab flattening mechanism 100 and the passing roller 300. One position condition is shown in FIG. 6, in which the tab material belt 30 simultaneously passes through the same side of the passing roller 300 and the abutting member 112; and the other position condition is shown in FIG. 7, in which the tab material belt 30 passes through between the passing roller 300 and the abutting member 112.

[0052] ​The pole piece material belt 30 is a supporting member 112, specifically, the supporting member 112 supports the pressure roller. More specifically, in combination with the rotation direction of the unwinding shaft 200 and the passing roller 300, the pole piece unwinding device 10 has the following multiple different working conditions. First, the unwinding shaft 200 rotates in the clockwise direction to unwind the pole piece material belt 30, and the passing roller 300 rotates in the clockwise direction under the driving of the pole piece material belt 30. At this time, the pole piece material belt 30 passes below the pressure roller, and the pole piece material belt 30 can better support the pressure roller, and the pressure roller rotates in the counterclockwise direction under the driving of the pole piece material belt 30. Of course, the pole piece material belt 30 can also pass above the pressure roller, so that the pressure roller rotates in the clockwise direction under the driving of the pole piece material belt 30.

[0053] Second, the unwinding shaft 200 rotates in the clockwise direction to unwind the pole piece material belt 30, and the passing roller 300 rotates in the counterclockwise direction under the driving of the pole piece material belt 30. At this time, the pole piece material belt 30 passes below the pressure roller, and the pole piece material belt 30 can better support the pressure roller, and the pressure roller rotates in the counterclockwise direction under the driving of the pole piece material belt 30. Of course, the pole piece material belt 30 can also pass above the pressure roller, so that the pressure roller rotates in the clockwise direction under the driving of the pole piece material belt 30.

[0054] Third, the unwinding shaft 200 rotates in the counterclockwise direction to unwind the pole piece material belt 30, and the passing roller 300 rotates in the clockwise direction under the driving of the pole piece material belt 30. At this time, the pole piece material belt 30 passes below the pressure roller, and the pole piece material belt 30 can better support the pressure roller, and the pressure roller rotates in the clockwise direction under the driving of the pole piece material belt 30. Of course, the pole piece material belt 30 can also pass above the pressure roller, so that the pressure roller rotates in the counterclockwise direction under the driving of the pole piece material belt 30.

[0055] Fourth, the unwinding shaft 200 rotates in the counterclockwise direction to unwind the pole piece material belt, and the passing roller 300 rotates in the counterclockwise direction under the driving of the pole piece material belt. At this time, the pole piece material belt 30 passes below the pressure roller, and the pole piece material belt 30 can better support the pressure roller, and the pressure roller rotates in the clockwise direction under the driving of the pole piece material belt 30. Of course, the pole piece material belt 30 can also pass above the pressure roller, so that the pressure roller rotates in the counterclockwise direction under the driving of the pole piece material belt 30.

[0056] Please refer to Figure 7The flattening pieces 113 can flatten the tabs 31 of the jelly-roll 30. Specifically, the flattening pieces 113 are generally plate-shaped and have edges facing the feeding direction of the jelly-roll 30. When the jelly-roll 30 passes through the flattening pieces 113, the folded tabs 31 of the jelly-roll 30 can abut against the edges of the flattening pieces 113, and as the jelly-roll 30 continues to be conveyed, the edges of the flattening pieces 113 can force the folded tabs 31 to gradually unfold. In this embodiment, two pairs of flattening pieces 113 are arranged above and below the jelly-roll 30, and the jelly-roll 30 can pass between the two pairs of flattening pieces 113. The lower flattening pieces 113 can flatten the tabs 31 folded downward, and the upper flattening pieces 113 can flatten the tabs 31 folded upward.

[0057] In this embodiment, the positions of the flattening pieces 113 on the swing frame 111 can be adjusted along a direction parallel to the swing axis. The swing axis extends in the width direction of the jelly-roll 30 passing through the tab flattening mechanism 100. By adjusting the positions of the flattening pieces 113 along the direction, the positions of the flattening pieces 113 can be better matched with the positions of the tabs 31, so as to ensure that the flattening pieces 113 can smoothly flatten the tabs 31.

[0058] More specifically, please refer to Figure 5 In this embodiment, the rotating assembly 110 further includes a support plate 114 mounted on the swing frame 111. The support plate 114 is provided with a mounting groove 1141 extending along a direction parallel to the swing axis, and the flattening pieces 113 are mounted in the mounting groove 1141. The flattening pieces 113 can slide along the mounting groove 1141 and be fixed at any position in the mounting groove 1141, so as to facilitate the adjustment of the positions of the flattening pieces 113 along the extension direction of the swing axis.

[0059] The servo assembly 120 is in transmission connection with the swing frame 111 and can drive the swing frame 111 to rotate. Specifically, the servo assembly 120 includes a servo motor 121, a speed reducer 122, and a shaft coupling 123. The servo motor 121 can output torque under the control of an upper computer (not shown) and transmit the torque to the swing frame 111 through the speed reducer 122 and the shaft coupling 123. The servo assembly 120 can drive the swing frame 111 to rotate and drive the abutting piece 112 to abut against the jelly-roll 30 passing through the tab flattening mechanism 100.

[0060] When the diameter of the jelly-roll 20 on the unwinding shaft 200 changes and causes the wrap angle between the jelly-roll 30 and the guide roller 300 to change, the servo assembly 120 can drive the swing frame 111 to swing by a corresponding angle according to the deflection angle of the jelly-roll 30, so as to drive the abutting piece 112 to swing with the jelly-roll 30, so that the abutting piece 112 always abuts against the jelly-roll 30.

[0061] When the abutting member 112 abuts against the pole piece material strip 30, the included angle θ between the pole piece material strip 30 and the swing frame 111 satisfies the relationship: sinθ=(R+r) / L Figure 3 or sinθ=(R-r) / L Figure 4 , where L is the distance between the swing axis of the swing frame 111 and the center of the abutting member 112, R is the radius of the roller 300, and r is the radius of the abutting member 112. Since L, R and r are constants, the included angle θ is constant regardless of the change of the running direction of the pole piece material strip 30 during unwinding, as long as the abutting member 112 abuts against the pole piece material strip 30.

[0062] The relative positions of the swing frame 111, the abutting member 112 and the flattening member 113 are fixed, and since the included angle θ is constant when the abutting member 112 abuts against the pole piece material strip 30, the angle at which the pole piece material strip 30 passes through the flattening member 113 will not change. Therefore, the pole piece material strip 30 can always pass through the flattening member 113 at a preset angle, thereby improving the flattening effect of the pole tab 31 during unwinding.

[0063] Specifically, the host computer can obtain the deflection angle of the pole piece material strip 30 in real time, and control the servo assembly 120 to operate accordingly, thereby driving the swing frame 111 to rotate by a corresponding angle, so that the abutting member 112 can still abut against the deflected pole piece material strip 30. Generally, the host computer obtains the deflection angle of the pole piece material strip 30 according to the change of the diameter of the pole piece material roll 20 during unwinding.

[0064] During unwinding, the included angle α between the pole piece material strip 30 and the line connecting the unwinding shaft 200 and the center of the roller 300 satisfies the relationship: sinα=(D+d) / 2H, β=θ-α Figure 1 , or sinα=(D-d) / 2H, β=θ+α Figure 2 , where β is the included angle between the swing frame 111 and the line connecting the unwinding shaft 200 and the center of the roller 300, θ is the included angle between the swing frame 111 and the pole piece material strip 30, D is the real-time diameter of the pole piece material roll 20, d is the diameter of the roller 300, and H is the length of the line connecting the unwinding shaft 200 and the center of the roller 300.

[0065] The change amount Δβ of the included angle β, i.e. the angle by which the swing frame 111 needs to rotate in order to ensure that the abutting member 112 abuts against the deflected pole piece material strip 30. Since the included angle θ is constant when the abutting member 112 abuts against the pole piece material strip 30, the absolute value of the change amount Δα of the included angle α is equal to Δβ. It can be seen that as long as the change amount of the diameter of the pole piece material roll 20 is monitored in real time, the host computer can control the servo assembly 120 to drive the swing frame 111 to swing by the required angle, so that the abutting member 112 can always abut against the pole piece material strip 30.

[0066] In the embodiment, the torque applied to the swing frame 111 by the servo assembly 120 is less than or equal to a threshold value. Since there can be errors in the diameter D of the pole piece coil 20, errors in the obtained Δα and Δβ can be caused. When the swing frame 111 has a rotation angle greater than the deflection angle of the pole piece tape 30, the pole piece tape 30 can be excessively pressed. Therefore, by limiting the maximum torque of the servo assembly 120, damage to the pole piece tape 30 under extreme conditions can be prevented.

[0067] In addition, referring again to Figure 5 and Figure 6 In the embodiment, the servo assembly 120 includes an origin sensor 124, and the rotation assembly 110 further includes a positioning reference 115 mounted to the swing frame 111, and the origin sensor 124 can cooperate with the positioning reference 115 to obtain the rotation angle of the swing frame 111.

[0068] Before the pole piece tape 30 is threaded, the servo assembly 120 can be operated to perform a zero-return operation. That is, the servo assembly 120 drives the swing frame 111 to return to the threading position according to the current rotation angle of the swing frame 111 and the angle of the recorded threading position, to facilitate threading. During normal operation, the host computer reads the diameter D of the pole piece coil 20 in real time and calculates the included angle α in real time according to the diameter D. The real-time value of α is compared with the initial value at the threading position to obtain the difference, and the required rotation angle of the swing frame 111 is obtained. The servo assembly 120 cooperates with the origin sensor 124 and the positioning reference 115 to smoothly rotate the swing frame 111 to the position.

[0069] Of course, in other embodiments, the servo motor 121 can be provided as an absolute value motor. At this time, the servo motor 121 can record the rotation angle by itself to obtain the rotation angle of the swing frame 111, so the origin sensor 124 and the positioning reference 115 can be omitted.

[0070] In the embodiment, the swing frame 111 includes a first swing arm 1111 and a second swing arm 1112, which are spaced apart along the extension direction of the swing axis and can be synchronously rotated about the swing axis, and the abutting member 112 and the flattening member 113 are distributed between the first swing arm 1111 and the second swing arm 1112.

[0071] Specifically, the first swing arm 1111 and the second swing arm 1112 can be rotatably mounted to the two ends of the fixed mandrel 310, so that the swing frame 111 can be supported from both ends of the fixed mandrel 310. Moreover, by arranging the abutting member 112 and the flattening member 113 between the first swing arm 1111 and the second swing arm 1112, the center of gravity of the entire rotation assembly 110 can be more centralized. In this way, the stability of the swing frame 111 during rotation about the swing axis can be improved.

[0072] In order to further balance the center of gravity of the rotating assembly 110 as a whole, the flattening member 113 is installed on one side of the second swing arm 1112 in this embodiment, and the servo assembly 120 is arranged on the other side of the first swing arm 1111.

[0073] In this embodiment, the tab flattening mechanism 100 further comprises a mounting seat 140 fixedly connected to the fixed mandrel 310, the swing frame 111 is rotatably mounted on the mounting seat 140 about the swing axis, and the servo assembly 120 is mounted on the mounting seat 140 and in transmission connection with the swing frame 111. Specifically, the mounting seat 140 provides a mounting position for the servo assembly 120, the first swing arm 1111 is rotatably connected to the fixed mandrel 310 through the mounting seat 140, and the second swing arm 1112 is directly rotatably connected to the fixed mandrel 310.

[0074] Further, in this embodiment, the mounting seat 140 comprises a fixing ring 141 and a mounting plate 142 connected to the fixing ring 141, the fixing ring 141 is sleeved and fixed on the fixed mandrel 310, and the mounting plate 142 has a fixing hole (not shown in the figure) concentric with the fixed mandrel 310. The rotating assembly 110 comprises a drive shaft 116 fixedly connected to the swing frame 111, the drive shaft 116 is rotatably mounted in the fixing hole through a bearing 117, and the servo assembly 120 is connected to the drive shaft 116.

[0075] The bearing 117 is mounted in the fixing hole, the drive shaft 116 is locked with the inner ring of the bearing 117, so that the drive shaft 116 can rotate about the swing axis, thereby enabling the swing frame 111 to rotate about the swing axis. Specifically, the drive shaft 116 is fixedly connected to the first swing arm 1111, so that the first swing arm 1111 can rotate about the swing axis, and the second swing arm 1111 is directly rotatably connected to the fixed mandrel 310 through another bearing (not labeled in the figure).

[0076] The tab flattening mechanism 100 and the tab unwinding device 10, the tab material belt 30 unwound by the unwinding shaft 200 will first pass through the tab flattening mechanism 100 before passing through the roller 300. When the diameter of the tab material roll 20 on the unwinding shaft 200 changes and causes the wrap angle between the tab material belt 30 and the roller 300 to change, the servo assembly 120 can drive the swing frame 111 to rotate according to the deflection angle of the tab material belt 30, so that the abutting piece 112 keeps abutting with the tab material belt 30. Under the drive of the servo assembly 120, the abutting piece 112 can realize swing following the tab material belt 30. Since the relative positions of the swing frame 111, the abutting piece 112 and the flattening piece 113 are fixed, the angle of the tab material belt 30 passing through the flattening piece 113 will not change when the abutting piece 112 keeps abutting with the tab material belt 30. Therefore, the tab material belt 30 can always pass through the flattening piece 113 at a preset angle during unwinding, thereby improving the effect of tab flattening.

[0077] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present disclosure.

[0078] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A tab-flush mechanism characterized by, The application relates to a tab flattening mechanism. The tab flattening mechanism comprises a rotating assembly and a servo assembly. The rotating assembly comprises a swing frame, a pressing roller and a flattening piece. The swing frame is rotatably arranged around a swing axis.

2. The tab-flush mechanism of claim 1, wherein, The pressing roller and the flattening piece are mounted on the swing frame.

3. The tab-flush mechanism of claim 1, wherein, The servo assembly is in transmission connection with the swing frame.

4. The tab-flush mechanism of claim 1, wherein, The servo assembly can drive the swing frame to rotate, so as to drive the pressing roller to abut against the tab material belt passing through the tab flattening mechanism.

5. The tab-flush mechanism of claim 4, wherein, The swing frame comprises a first swing arm and a second swing arm.

6. The tab-flush mechanism of claim 1, wherein, The first swing arm and the second swing arm are arranged along the extension direction of the swing axis and can synchronously rotate around the swing axis.

7. The tab-flush mechanism of claim 1, wherein, The pressing roller and the flattening piece are distributed between the first swing arm and the second swing arm.

8. The tab-flush mechanism of claim 1, wherein, The rotating shaft of the pressing roller is parallel to the swing axis.

9. A roll-over assembly characterized by, The position of the flattening piece on the swing frame can be adjusted along the direction parallel to the swing axis.

10. The roll assembly of claim 9, wherein, The rotating assembly further comprises a supporting plate mounted on the swing frame.

11. The roll assembly of claim 10, wherein, The supporting plate is provided with a mounting groove extending along the direction parallel to the swing axis.

12. The roll assembly of claim 10, wherein, The flattening piece is mounted in the mounting groove.

13. The roll assembly of claim 9, wherein, The torque applied by the servo assembly to the swing frame is less than or equal to a threshold value.

14. An electrode tab unwinding device, characterized by, The servo assembly comprises an origin sensor.

15. The pole piece unwinding device of claim 14, wherein, The rotating assembly further comprises a positioning reference mounted on the swing frame. The origin sensor can cooperate with the positioning reference to obtain the rotation angle of the swing frame. The servo assembly comprises a servo motor. The servo motor is an absolute value motor. The application further relates to a roller assembly. The swing axis is consistent with the extension direction of the rotating shaft of the roller. The roller is mounted on a fixed mandrel and can rotate around the axis of the fixed mandrel. The tab flattening mechanism is mounted on the fixed mandrel. The swing frame is arranged on the fixed mandrel. The tab flattening mechanism comprises a mounting seat. The mounting seat comprises a fixing ring and a mounting plate connected with the fixing ring. The fixing ring is sleeved and fixed on the fixed mandrel. The mounting plate is provided with a fixing hole concentric with the fixed mandrel. The rotating assembly comprises a driving shaft fixedly connected with the swing frame. The driving shaft is rotatably mounted in the fixing hole through a bearing. The servo assembly is connected with the driving shaft. The swing frame is mounted on the mounting support and the swing axis is consistent with the rotating shaft of the roller. The application further relates to a roller assembly. The swing axis is consistent with the extension direction of the rotating shaft of the roller. The pressing roller is rotatably mounted on the swing frame. The roller rotates in the clockwise direction to unwind the tab material belt. The roller rotates in the clockwise or counterclockwise direction under the driving of the tab material belt.

16. The pole piece unwinding device of claim 14, wherein The resisting member is a press roller rotatably mounted on the swing frame, the unwinding shaft rotates in the clockwise direction to unwind the pole piece material belt, the passing roller rotates in the counterclockwise direction under the driving of the pole piece material belt, and the press roller rotates in the clockwise or counterclockwise direction under the driving of the pole piece material belt.

17. The pole piece unwinding device of claim 14, wherein The resisting member is a press roller rotatably mounted on the swing frame, the unwinding shaft rotates in the counterclockwise direction to unwind the pole piece material belt, the passing roller rotates in the clockwise direction under the driving of the pole piece material belt, and the press roller rotates in the clockwise or counterclockwise direction under the driving of the pole piece material belt.

18. The pole piece unwinding device of claim 14, wherein, The resisting member is a press roller rotatably mounted on the swing frame, the unwinding shaft rotates in the counterclockwise direction to unwind the pole piece material belt, the passing roller rotates in the counterclockwise direction under the driving of the pole piece material belt, and the press roller rotates in the clockwise or counterclockwise direction under the driving of the pole piece material belt.

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