Pole lug flattening mechanism, pole piece conveying device and battery cell production equipment

Abstract

The utility model relates to a pole lug smoothing mechanism and a pole piece conveying device, the pole lug smoothing mechanism comprises a smoothing plate, the two ends of the smoothing plate in the length direction are respectively a feeding end and a discharging end, and a smoothing part is formed on the side surface of the smoothing plate between the feeding end and the discharging end. The pole piece can pass through the smoothing plate from the feeding end to the discharging end and faces one side of the first surface. And at the moment, the flattening part positioned on the side surface of the flattening plate can be in sliding butt joint with the edge of the turnover tab. Along with the continuous conveying of the pole piece, the edge of the pole lug slides under the guidance of the flattening part so as to flatten the pole lug. Therefore, the folded tab can be effectively flattened only by ensuring that the edge of the folded tab can be in contact with the flattening part when the pole piece passes through the flattening plate, so that the tabs in various different folded states can be flattened. Therefore, the electrode lug flattening mechanism and the electrode piece conveying device are good in flattening effect. In addition, the utility model further provides a pole piece conveying device and battery cell production equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery equipment, and particularly relates to an ear flattening mechanism, a pole piece conveying device and a battery cell production equipment. Background Art

[0002] During the processing and conveying of the pole piece, the ear may be folded, so generally it is necessary to flatten the pole piece to eliminate the folding of the ear. Since the folding direction and folding angle of the ear are both uncontrollable, there are various possibilities for the folding situation of the ear. However, the existing ear flattening mechanisms cannot cope with various different folding situations, resulting in poor ear flattening effect and ultimately may affect the yield of the battery cell. Summary of the Utility Model

[0003] Based on this, in view of the above problems, it is necessary to provide an ear flattening mechanism, a pole piece conveying device and a battery cell production equipment with better flattening effect.

[0004] An ear flattening mechanism includes a flattening plate. The two ends of the flattening plate in the length direction are respectively a feeding end and a discharging end. The flattening plate includes a first surface, a second surface and a side surface connecting the first surface and the second surface. The side surface forms a flattening part between the feeding end and the discharging end.

[0005] In one embodiment, the flattening part is used for slidingly abutting against the edge of the ear when the pole piece passes through the side of the flattening plate facing the first surface from the feeding end to the discharging end, and guiding the ear to the first surface.

[0006] In one embodiment, the acting force applied by the flattening part to the edge of the ear includes a first component force and a second component force. The acting direction of the first component force is along the width direction of the pole piece away from the coating area of the pole piece, and the acting direction of the second component force is perpendicular to the surface of the pole piece.

[0007] In one embodiment, the flattening part forms a flattening surface extending from the feeding end to the discharging end, and the flattening surface connects the first surface and the second surface.

[0008] In one embodiment, the flattening surface is set as a plane, and the included angle between the flattening surface and the first surface is greater than or equal to 90 degrees.

[0009] In one embodiment, the flattening surface is set as a plane, and the included angle between the flattening surface and the second surface is less than or equal to 90 degrees.

[0010] In one embodiment, the flattening surface and the first surface and the second surface are both connected by a round chamfer for transition.

[0011] In one embodiment, the flattening surface includes a first flattening surface and a second flattening surface that are sequentially arranged between the feeding end and the discharging end, and the angle between the second flattening surface and the first surface is smaller than the angle between the first flattening surface and the first surface.

[0012] In one embodiment, the flattening surface includes a first flattening surface and a second flattening surface that are sequentially arranged between the feeding end and the discharging end, and the angle between the second flattening surface and the second surface is greater than the angle between the first flattening surface and the second surface.

[0013] In one embodiment, the first half section of the first flattening surface near the feeding end is connected to the second surface, the second half section of the first flattening surface near the discharging end is spaced from the second surface, and both the first half section and the second half section of the first flattening surface are connected to the first surface. The second flattening surface connects the second half section of the first flattening surface and the second surface.

[0014] In one embodiment, the first flattening surface is transitionally connected to both the first surface and the second surface through a circular chamfer; the second flattening surface is transitionally connected to both the first flattening surface and the second surface through a circular chamfer.

[0015] In one embodiment, the first surface is inclined relative to the second surface, and in the direction from the feeding end to the discharging end, the distance between the first surface and the second surface gradually increases.

[0016] In one embodiment, the flattening portions are formed on both sides in the width direction of the flattening plate, and the flattening portions on both sides are symmetrically arranged.

[0017] In one embodiment, the tab flattening mechanism is provided with two flattening plates, and the first surfaces of the two flattening plates are oppositely arranged.

[0018] In one embodiment, the distance between the two flattening plates is adjustable.

[0019] In one embodiment, the position of the flattening plate in the width direction is adjustable.

[0020] In one embodiment, the first surface is inclined relative to the second surface, and in the direction from the feeding end to the discharging end, the distance between the first surface and the second surface gradually increases, and the second surfaces of the two flattening plates are parallelly arranged.

[0021] In one embodiment, the first surface is parallel to the second surface, and the angle between the first surfaces of the two flattening plates is adjustable.

[0022] In one embodiment, the tab flattening mechanism further includes a mounting frame, and the two flattening plates are both mounted on the mounting frame.

[0023] In one embodiment, in the direction extending from the feeding end to the discharging end, the width of the flattening plate gradually increases, so that the flattening portion is arranged at an angle to the length direction of the flattening plate.

[0024] For the above tab flattening mechanism, the electrode sheet can pass by one side of the flattening plate from the feeding end to the discharging end. At this time, the flattening portion located on the side surface of the flattening plate can contact the tab that is folded at the edge of the electrode sheet, and as the electrode sheet continues to be conveyed, the tab will be flattened under the guidance of the flattening portion. It can be seen that as long as it is ensured that the folded tab can contact the flattening portion when the electrode sheet passes by the flattening plate, the folded tab can be effectively flattened, so the tab flattening mechanism can flatten tabs in a variety of different folding states. Therefore, the flattening effect of the above tab flattening mechanism is better.

[0025] An electrode sheet conveying device includes a conveying mechanism and the tab flattening mechanism according to any one of the above preferred embodiments. The electrode sheet conveyed by the conveying mechanism can pass by the side of the flattening plate facing the first surface from the feeding end to the discharging end.

[0026] In one embodiment, the conveying mechanism includes a guide roller, and the electrode sheet passing out from the discharging end winds around the guide roller.

[0027] In one embodiment, when the electrode sheet passes by the side of the flattening plate facing the first surface, the flattening portion can abut against the tab folded towards the first surface.

[0028] In one embodiment, the electrode sheet passing by the flattening plate is parallel to the second surface.

[0029] In one embodiment, the feeding end is within the range of the coating area of the electrode sheet passing by the flattening plate, and the discharging end is flush with or protrudes from the edge of the electrode sheet provided with tabs in the width direction of the electrode sheet.

[0030] A battery cell production device includes the electrode sheet conveying device according to any one of the above preferred embodiments. Description of the Drawings

[0031] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying 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 accompanying drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a schematic structural diagram of a pole piece processing device in an embodiment of the present utility model;

[0033] Figure 2 It is Figure 1 a side view of the pole piece processing device shown;

[0034] Figure 3 It is Figure 1 a schematic structural diagram of an ear flattening mechanism in the pole piece processing device shown;

[0035] Figure 4 It is Figure 3 a side view of the ear flattening mechanism shown;

[0036] Figure 5 It is a schematic diagram of the scene when the pole piece passes through Figure 3 the ear flattening mechanism shown;

[0037] Figure 6 It is Figure 3 a schematic structural diagram of the flattening plate in the ear flattening mechanism shown;

[0038] Figure 7 It is Figure 6 a front view of the flattening plate shown;

[0039] Figure 8 It is Figure 6 a side view of the flattening plate shown;

[0040] Figure 9 It is a schematic diagram of the folding state of the pole piece ear in an embodiment of the present utility model. Detailed Embodiments

[0041] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following will make a detailed description of the specific embodiments of the present utility model with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0042] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by 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. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present utility model.

[0043] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0044] In the present utility model, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0045] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may 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 being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0046] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0047] Please refer to Figure 1 and Figure 2 , the present utility model provides a pole piece conveying device 10 and an ear flattening mechanism 100. Among them, the pole piece conveying device 10 includes an ear flattening mechanism 100 and a conveying mechanism 200.

[0048] The conveying mechanism 200 is used to convey the pole piece 20 along a preset path. The ear flattening mechanism 100 is arranged on the conveying path of the pole piece 20, and the pole piece 20 conveyed by the conveying mechanism 200 can pass through the ear flattening mechanism 100. The pole piece 20 includes a coating area 22 and an ear 21 extending outward from the edge in the width direction of the coating area 22 (see Figure 5 and Figure 9 ), and the coating area 22 is a functional area of the pole piece 20 coated with an active material layer.

[0049] During the processing and conveying of the pole piece 20, the ear 21 may be folded relative to the coating area 22. Specifically, there are various possibilities for the folding state of the ear 21. For example, Figure 9 as shown in (a) in Figure 9 , the whole ear 21 is folded relative to the coating area 22; while

[0050] as shown in (b) in

[0051] , the two sharp corners of the ear 21 are folded relative to the coating area 22. The pole piece 20 passing through the ear flattening mechanism 100 can have the folded ear 21 flattened by the ear flattening mechanism 100 to reduce or eliminate the folding angle of the ear 21, thereby improving the quality of the pole piece 21 and helping to improve the yield of the subsequent prepared battery cell.

[0052] Please refer to Figure 3 andFigure 4 In one embodiment of the present utility model, the tab flattening mechanism 100 includes a flattening plate 110 and a mounting frame 120.

[0053] The mounting frame 120 serves as a support. The flattening plate 110 is mounted on the mounting frame 120, and the mounting frame 120 can be connected to the bracket of the conveying mechanism 200, so as to arrange the tab flattening mechanism 100 on the conveying path of the pole piece 20.

[0054] Please refer to Figures 6 to 8 simultaneously. The flattening plate 110 includes a first surface 110a, a second surface 110b, and a side surface (not labeled in the figure) connecting the first surface 110a and the second surface 110b. The first surface 110a and the second surface 110b are oppositely arranged along the thickness direction of the flattening plate 110, and both are generally arranged as flat surfaces. The first surface 110a and the second surface 110b can be parallel to each other or inclined relative to each other. The pole piece 20 conveyed by the conveying mechanism 200 can pass through the side of the flattening plate 110 facing the first surface 110a. Moreover, the pole piece 20 passing through the flattening plate 110 is parallel to the second surface 110b.

[0055] The two ends of the flattening plate 110 in the length direction are respectively a feeding end 101 and a discharging end 102. The pole piece 20 conveyed by the conveying mechanism 200 can pass through the flattening plate 110 from the feeding end 101 to the discharging end 102. Specifically, the first surface 110a of the flattening plate 110 can be oppositely arranged with the first surface 110 of another flattening plate 110, and a shaping channel 103 for the pole piece 20 to pass through is formed between the two first surfaces 110 (see Figure 4 ). When the conveying mechanism 200 drives the pole piece 20 to pass through the tab flattening mechanism 100, the pole piece 20 passes through the above-mentioned shaping channel 103 from the feeding end 101 to the discharging end 102.

[0056] In addition, in the embodiment where the pole piece 20 is conveyed by a conveyor belt, the first surface 110a of the flattening plate 110 can also be oppositely arranged with the bearing surface of the conveying mechanism 200, and cooperate with the bearing surface of the conveying mechanism 200 to form a shaping channel 103 for the pole piece 20 to pass through. Or, a support plate (not shown in the figure) oppositely arranged with the first surface 110a of the flattening plate 110 can also be provided, and a shaping channel 103 for the pole piece 20 to pass through can also be formed between the first surface 110a of the flattening plate 110 and the support plate.

[0057] Further, a flattening portion 111 is formed between the feeding end 101 and the discharging end 102 of the flattening plate 110. When the pole piece 20 passes through the side of the flattening plate 110 facing the first surface 110a from the feeding end 101 to the discharging end 102, the flattening portion 111 can contact the ear 21 whose edge of the pole piece 20 is folded (folded towards the first surface 110a). And as the pole piece 20 continues to be conveyed, the ear 21 will be flattened under the guidance of the flattening portion 111.

[0058] Further, the flattening portion 111 can slidably abut against the edge of the ear 21 and guide the ear 21 to the first surface 110a. When the flattening portion 111 contacts the edge of the ear 21, it is required that the friction force between the two is small to ensure that the flattening portion 111 smoothly guides the ear 21 to slide. Therefore, the flattening plate 110 is generally made of a material with a small friction coefficient, such as metal forming, and the portion of the flattening portion 111 in contact with the edge of the ear 21 has a high smoothness.

[0059] When the flattening portion 111 slidably abuts against the edge of the folded ear 21, the continuous conveyance of the pole piece 20 can drive the edge of the ear 21 to slide under the guidance of the flattening portion 111 until the ear 21 is guided to the first surface 110a. During the process of the edge of the ear 21 sliding along the flattening portion 111, the acting force applied to the ear 21 by the flattening portion 111 can gradually drive the folded ear 21 to flatten. And when the ear 21 is guided to the first surface 110a, the ear 21 can be attached to the first surface 110a, so that the ear 21 can pass through the shaping channel 103 to effectively flatten the ear 21, significantly reducing the folding angle of the ear 21 relative to the coating area 22.

[0060] Specifically, during the process of the edge of the ear 21 sliding along the flattening portion 111, the acting force applied by the flattening portion 111 to the edge of the ear 21 has at least two mutually perpendicular component forces. One component force is in the direction away from the coating area 22 along the width direction of the pole piece 20, and the other component force is perpendicular to the surface of the pole piece 20. For example, if the surface of the pole piece 20 is parallel to the horizontal plane and passes under the flattening plate 110, then one component force is parallel to the horizontal plane and the other component force is vertically downward. In this way, the flattening portion 111 can simultaneously push and press the edge of the ear 21 outward and downward, thereby gradually flattening the folded ear 21 and guiding the ear 21 to the shaping channel 103 for flattening.

[0061] With Figure 5Taking the figure shown as an example, two sharp corners of one tab 21 of the electrode tab 20 are bent, and the bending direction is upward (i.e., perpendicular to the drawing plane and outward as shown in the figure). When the electrode tab 20 passes under the flattening plate 110 from left to right, the right edge S1 of the tab 21 can first come into sliding contact with the flattening portion 111, and during the process of the edge S1 sliding along the flattening portion 111, there are two component forces for the force applied by the flattening portion 111 to the edge S1. One of the component forces is in the direction along Figure 5 shown upward, and the other component force is in the direction along Figure 5 shown perpendicular to the drawing plane and inward. In this way, the flattening portion 111 will simultaneously push the edge S1 of the tab 21 in the directions of Figure 5 shown upward and perpendicular to the drawing plane and inward, so as to flatten the right sharp corner of the tab 21.

[0062] As the electrode tab 20 continues to be conveyed from left to right, the left edge S2 of the tab 21 can also come into sliding contact with the flattening portion 111. Referring to the similar interaction process above, the flattening portion 111 can also simultaneously push the edge S2 of the tab 21 in the directions of Figure 5 shown upward and perpendicular to the drawing plane and inward, so as to flatten the left sharp corner of the tab 21. Finally, the tab 21 is guided to the shaping channel 103 for further flattening.

[0063] Similarly, for the tab 21 that is folded as a whole, when the electrode tab 20 passes under the flattening plate 110 from left to right, the right edge of the tab 21 can come into sliding contact with the flattening portion 111, and during the process of the edge sliding along the flattening portion 111, there are two mutually perpendicular component forces for the force applied by the flattening portion 111 to the edge. Under the action of the two mutually perpendicular component forces, the flattening portion 111 will also simultaneously push the edge of the tab 21 in the directions of Figure 5 shown upward and perpendicular to the drawing plane and inward, so as to gradually flatten and smooth the tab 21.

[0064] It can be seen from this that as long as it is ensured that when the electrode tab 20 passes by the flattening plate 110, the edge of the folded tab 21 can come into contact with the flattening portion 111, the folded tab 21 can be effectively flattened, so the tab 21 in various different folding states can be flattened.

[0065] Please refer to Figure 5 again. In order to ensure that the tab 21 can be effectively flattened, when the electrode tab 20 passes by one side of the flattening plate 110, it is necessary to ensure that the feeding end 101 is within the range of the coating area 22 to avoid collision between the feeding end 101 and the tab 21; and the discharging end 102 is flush with the edge of the electrode tab 20 or protrudes from the edge of the electrode tab 20 in the width direction of the electrode tab 20, so as to avoid partial exposure of the tab 21 outside the shaping channel 103.

[0066] Specifically, in this embodiment, the position of the caressing plate 110 along the width direction is adjustable. By adjusting the position of the caressing plate 110 along the width direction, the relative position of the caressing plate 110 and the electrode 20 can be adjusted, thereby adjusting the positions of the feed end 101 and the discharge end 102 according to the width of the electrode 20 to ensure that the caressing plate 110 is located within the coating area 22 and the discharge end 102 protrudes or is flush with the edge of the electrode 20 in the width direction of the electrode 20.

[0067] In actual use, the first surface 110a of the smoothing plate 110 can be set up or down. When the first surface 110a of the smoothing plate 110 is set up, the pole piece 20 passing through the tab smoothing mechanism 100 passes above the smoothing plate 110, and the smoothing plate 110 can smooth the pole tab 21 of the pole piece 20 that is folded downward. When the first surface 110a of the smoothing plate 110 is set down, the pole piece 20 passing through the tab smoothing mechanism 100 passes below the smoothing plate 110, and the smoothing plate 110 can smooth the pole tab 21 of the pole piece 20 that is folded upward.

[0068] Please refer again Figure 3 and Figure 4 In this embodiment, the tab-smoothing mechanism 100 is provided with two smoothing plates 110, with the first surfaces 110a of the two smoothing plates 110 facing each other. The shaping channel 103 is formed between the first surfaces 110a of the two smoothing plates 110, passing through the tab-smoothing mechanism 100 and between the two smoothing plates 110.

[0069] The two smoothing plates 110 cooperate to smooth the tabs 21 that are folded in different directions. Figure 4 For example, the smoothing plate 110 with the first surface 110a facing downward can smooth the tab 21 that is folded upward, while the smoothing plate 110 with the first surface 110a facing upward can smooth the tab 21 that is folded downward. In this way, the tab smoothing mechanism 100 can be adapted to smooth tabs 21 in more different folding states.

[0070] When the electrode 20 passes through the tab smoothing mechanism 100 , the smoothing plate 110 is close to the electrode 20 to prevent the smoothing plate 110 from being too far away from the electrode 20 and failing to effectively contact the tab 21 or failing to smooth a slightly raised tab 21 .

[0071] Furthermore, in this embodiment, the distance between the two smoothing plates 110 is adjustable. By adjusting the distance between the two smoothing plates 110, the height of the shaping channel 103 can be adjusted, thereby bringing the first surface 110a of the smoothing plate 110 and the surface of the pole piece 20 closer to a desired distance. Furthermore, by adjusting the height of the shaping channel 103, it can also accommodate pole pieces 20 of varying thicknesses.

[0072] In this embodiment, the first surface 110a is inclined with respect to the second surface 110b, and in the direction from the feeding end 101 to the discharging end 102, the distance between the first surface 110a and the second surface 110b gradually increases.

[0073] That is to say, the thicknesses of the regions of the flattening plate 110 are different, that is, in the direction from the feeding end 101 to the discharging end 102, the thickness of the flattening plate 110 gradually increases. Thus, at one end of the shaping channel 103 close to the feeding end 101, a larger feeding angle can be formed, facilitating the threading of the pole piece 20.

[0074] In addition, in another embodiment, the first surface 110a is parallel to the second surface 110b, and the included angle between the first surfaces 110a of the two flattening plates 110 is adjustable. At this time, the thicknesses of the regions of the flattening plate 110 are the same, and the included angle between the first surfaces 110a can be adjusted by rotating either one of the two flattening plates 110, so as to form a larger feeding angle at one end of the shaping channel 103 close to the feeding end 101.

[0075] In addition, please refer to again Figure 7 , in this embodiment, flattening portions 111 are formed on both sides in the width direction of the flattening plate 110, and the flattening portions 111 on both sides are symmetrically arranged. Therefore, whether the first surface 110a of the flattening plate 110 faces upward or downward, it does not affect its use, so there is no need to distinguish between the two sides of the flattening plate 110.

[0076] Please refer to again Figure 6 , Figure 7 and Figure 8 , in this embodiment, the flattening portion 111 includes a flattening surface (not labeled in the figure) extending from the feeding end 101 to the discharging end 102, and the flattening surface connects the first surface 110a and the second surface 110b. The above-mentioned flattening surface is used for slidingly abutting against the edge of the folded tab 21, so as to flatten the folded tab 21. The above-mentioned flattening surface can be a plane or a three-dimensional surface composed of multiple planes.

[0077] In this embodiment, the flattening surface includes a first flattening surface 1111 and a second flattening surface 1112 arranged in sequence between the feeding end 101 and the discharging end 102, and the included angle between the second flattening surface 1112 and the first surface 110a is smaller than the included angle between the first flattening surface 1111 and the first surface 110a. Alternatively, the included angle between the second flattening surface 1112 and the second surface 110b is larger than the included angle between the first flattening surface 1111 and the second surface 110b.

[0078] At this time, the above-mentioned flattening plane is a three-dimensional plane jointly formed by the first flattening plane 1111 and the second flattening plane 1112. During the process of the pole piece 20 passing through the flattening plate 110, the first flattening plane 1111 and the second flattening plane 1112 can first slide and abut against the edge of the turned-over tab 21.

[0079] The first flattening plane 1111 is inclined relative to the first surface 110a, and the included angle between the first flattening plane 1111 and the first surface 110a is an obtuse angle. The first flattening plane 1111 can extend to the discharge end 102, or can extend to the area between the feeding end 101 and the discharge end 102. When the pole piece 20 passes through the flattening plate 110, the first flattening plane 1111 can slide and abut against the edge of the turned-over tab 21. Since the first flattening plane 1111 is a plane, the frictional force between the first flattening plane 1111 and the edge of the tab 21 is small. Moreover, since the included angle between the first flattening plane 1111 and the first surface 110a is an obtuse angle, when the edge of the pole piece 20 slides along the first flattening plane 1111, the first flattening plane 1111 can apply a component force with a direction pointing to the first surface 110b to the edge of the pole piece 20, thereby guiding the tab 21 towards the first surface 110a.

[0080] Furthermore, when the pole piece 20 passes through the flattening plate 110, the first flattening plane 1111 is arranged at an angle with the edge of the pole piece 20. Therefore, the first flattening plane 1111 can also apply a component force along the width direction of the pole piece 20 away from the coating area 22 to the edge of the pole piece 20. In this way, the two component forces cooperate with each other, and can simultaneously push and press the edge of the turned-over tab 21 outwards and downwards, so as to gradually flatten the turned-over tab 21.

[0081] Specifically, the installation angle of the flattening plate 110 can be adjusted so that the first flattening plane 1111 is arranged at an angle with the edge of the pole piece 20. In addition, the structure of the flattening plate 110 can also be set so that the first flattening plane 1111 is arranged at an angle with the edge of the pole piece 20. Specifically, in this embodiment, in the direction extending from the feeding end 101 to the discharge end 102, the width of the flattening plate 110 gradually increases, so that the flattening portion 111 is arranged at an angle with the length direction of the flattening plate 110.

[0082] More specifically, the flattening plate 110 can be set as a triangle or a trapezoid, and its feeding end 101 is arranged at the vertex angle of the triangular flattening plate 110 or the upper base of the trapezoidal flattening plate 110. In this way, when the pole piece 20 passes through the flattening plate 110 along the length direction of the flattening plate 110, the first flattening plane 1111 can be arranged at an angle with the edge of the pole piece 20.

[0083] The second flattening plane 1112 is also a plane. Moreover, the second flattening plane 1112 is steeper than the first flattening plane 1111. Therefore, for the integrally folded tab 21, when the flattening portion 111 guides it to move towards the first surface 110a, the effect of the second flattening plane 1112 pushing the tab 21 outwards is more obvious than that of the first flattening plane 1111. Therefore, the combination of the second flattening plane 1112 and the first flattening plane 1111 can further improve the flattening effect on the tab 21.

[0084] Furthermore, in this embodiment, the first half of the first flattening plane 1111 near the feeding end 101 is connected to the second surface 110b, the second half of the first flattening plane 1111 near the discharging end 102 is spaced from the second surface 110b, and both the first half and the second half of the first flattening plane 1111 are connected to the first surface 110a. The second flattening plane 1112 is connected to the second half of the first flattening plane 1111 and the second surface 110b. It can be seen that both the first flattening plane 1111 and the second flattening plane 1112 are generally triangular.

[0085] When preparing the flattening plate 110, the plate can be processed into a trapezoid or a triangle first. The side surfaces corresponding to the two waists of the trapezoid or triangle can be used as the second flattening plane 1112. Then, after forming the second flattening plane 1112, cut inwards along the side surface and retain part of the second flattening plane 1112, and the cut plane can be used as the first flattening plane 1111.

[0086] Specifically, in this embodiment, both the first flattening plane 1111 and the first surface 110a and the second surface 110b are connected by a rounded chamfer for transition. Similarly, the second flattening plane 1112 and the first flattening plane 1111 and the second surface 110b are connected by a rounded chamfer for transition. In this way, the surface of the flattening portion 111 is smooth and there is no sharp corner structure. Therefore, when the pole piece 20 passes through the flattening plate 110, it can effectively prevent the flattening portion 111 from cutting the tab 21.

[0087] In addition, in another embodiment, the flattening plane is set as a plane, and the angle between the flattening plane and the first surface 110a is greater than or equal to 90 degrees. Or, the angle between the flattening plane and the second surface is less than or equal to 90 degrees. At this time, the flattening plane is an entire plane. Moreover, both the flattening plane and the first surface 110a and the second surface 110b are connected by a rounded chamfer for transition.

[0088] For the above tab smoothing mechanism 100, the tab 20 can be driven by the conveying mechanism 200 to pass from the feeding end 101 to the discharging end 102 and towards the side of the first surface 110a of the tab smoothing plate 110. At this time, the tab smoothing portion 111 on the side surface of the tab smoothing plate 110 can slide and abut against the edge of the folded tab 21. As the tab 20 continues to be conveyed, the edge of the tab 21 will slide under the guidance of the tab smoothing portion 111 to smooth the tab 21. It can be seen that as long as it is ensured that the edge of the folded tab 21 can contact the tab smoothing portion 111 when the tab 20 passes through the tab smoothing plate 110, the folded tab 21 can be effectively smoothed. Therefore, the tab 21 in various different folding states can be smoothed. Therefore, the tab smoothing effect of the above tab smoothing mechanism 100 is relatively good.

[0089] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0090] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. An ear flattening mechanism, characterized in that, It includes a leveling plate. The two ends of the leveling plate in the length direction are respectively a feeding end and a discharging end. The leveling plate includes a first surface, a second surface, and a side surface connecting the first surface and the second surface. A leveling portion is formed on the side surface between the feeding end and the discharging end.

2. The tab flattening mechanism according to claim 1, wherein The leveling portion is used for slidingly abutting against the edge of the tab when the electrode sheet passes through the side of the leveling plate facing the first surface from the feeding end to the discharging end, and guiding the tab to the first surface.

3. The tab flattening mechanism according to claim 2, wherein, The acting force exerted by the leveling portion on the edge of the tab includes a first component force and a second component force. The acting direction of the first component force is away from the coating area of the electrode sheet along the width direction of the electrode sheet, and the acting direction of the second component force is perpendicular to the surface of the electrode sheet.

4. The tab flattening mechanism according to claim 1, wherein The leveling portion is formed with a leveling surface extending from the feeding end to the discharging end. The leveling surface connects the first surface and the second surface.

5. The tab flattening mechanism according to claim 4, characterized in that, The leveling surface is set as a plane, and the included angle between the leveling surface and the first surface is greater than or equal to 90 degrees.

6. The tab flattening mechanism according to claim 4, characterized in that, The leveling surface is set as a plane, and the included angle between the leveling surface and the second surface is less than or equal to 90 degrees.

7. The tab flattening mechanism according to claim 5 or 6, characterized in that, The leveling surface is transitionally connected to the first surface and the second surface through a round chamfer.

8. The tab flattening mechanism according to claim 4, characterized in that, The leveling surface includes a first leveling surface and a second leveling surface sequentially arranged between the feeding end and the discharging end, and the included angle between the second leveling surface and the first surface is less than the included angle between the first leveling surface and the first surface.

9. The tab flattening mechanism according to claim 4, wherein The leveling surface includes a first leveling surface and a second leveling surface sequentially arranged between the feeding end and the discharging end, and the included angle between the second leveling surface and the second surface is greater than the included angle between the first leveling surface and the second surface.

10. The tab flattening mechanism according to claim 8 or 9, characterized in that, The first half of the first leveling surface close to the feeding end is connected to the second surface. The second half of the first leveling surface close to the discharging end is spaced from the second surface. Both the first half and the second half of the first leveling surface are connected to the first surface. The second leveling surface connects the second half of the first leveling surface and the second surface.

11. The tab flattening mechanism according to claim 10, wherein The first leveling surface is transitionally connected to the first surface and the second surface through a round chamfer; the second leveling surface is transitionally connected to the first leveling surface and the second surface through a round chamfer.

12. The tab flattening mechanism according to claim 1, characterized in that, The first surface is inclined with respect to the second surface, and in the direction of extending from the feeding end to the discharging end, the distance between the first surface and the second surface gradually increases.

13. The tab flattening mechanism according to claim 1, wherein The leveling portions are formed on both sides of the leveling plate in the width direction, and the leveling portions on both sides are symmetrically arranged.

14. The tab flattening mechanism according to claim 1, wherein The tab leveling mechanism is provided with two leveling plates, and the first surfaces of the two leveling plates are arranged oppositely.

15. The tab flattening mechanism according to claim 14, wherein, The distance between the two leveling plates is adjustable.

16. The tab flattening mechanism according to claim 14, characterized in that, The position of the leveling plate in the width direction is adjustable.

17. The tab flattening mechanism according to claim 14, characterized in that, The first surface is inclined with respect to the second surface, and in the direction of extending from the feeding end to the discharging end, the distance between the first surface and the second surface gradually increases. The second surfaces of the two leveling plates are parallelly arranged.

18. The tab flattening mechanism according to claim 14, characterized in that, The first surface is parallel to the second surface, and the included angle between the first surfaces of the two flattening plates is adjustable.

19. The tab flattening mechanism according to claim 14, characterized in that, The tab flattening mechanism further includes a mounting frame, and both of the two flattening plates are mounted on the mounting frame.

20. The tab flattening mechanism according to claim 1, characterized in that, In the direction extending from the feeding end to the discharging end, the width of the flattening plate gradually increases, so that the flattening portion is arranged at an angle with respect to the length direction of the flattening plate.

21. A pole piece conveying device, characterized in that, It includes a conveying mechanism and the tab flattening mechanism according to any one of claims 1 to 20 above. The tab can be conveyed by the conveying mechanism and pass through the side of the flattening plate facing the first surface from the feeding end to the discharging end.

22. The pole piece conveying device according to claim 21, characterized in that, The conveying mechanism includes a guide roller, and the tab passing through the discharging end winds around the guide roller.

23. The pole piece conveying device according to claim 21, characterized in that, When the tab passes through the side of the flattening plate facing the first surface, the flattening portion can be in contact with the tab folded towards the first surface.

24. The pole piece conveying device according to claim 21, characterized in that, The tab passing through the flattening plate is parallel to the second surface.

25. The pole piece conveying device according to claim 21, wherein, The feeding end is within the range of the coating area of the tab passing through the flattening plate, and the discharging end is flush with or protrudes from the edge of the tab provided with tabs in the width direction of the tab.

26. A battery cell production device, characterized in that, It includes the tab conveying device according to any one of claims 21 to 25 above.

Images