Pole piece roller press
By setting protruding strips with opposite rotation directions in the electrode roll press to pull the foil on the flattening shaft, the problems of foil wrinkling and strip breakage are solved, the coating density is maintained, and the performance of lithium batteries is improved.
Patent Information
- Application Number
- CN202423299933.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In the lithium battery production process, foil is prone to wrinkles and breakage during rolling. Existing technologies such as reducing rolling pressure or attaching Teflon are not effective and affect the areal density and compaction density of the coating.
In the electrode roll press, first and second protruding strips with opposite rotation directions are set on the flattening shaft downstream of the roll pressing shaft. They apply opposite pulling forces to the electrode to flatten the foil wrinkles, avoid strip breakage, and keep the roll pressing pressure constant.
It effectively smooths out foil wrinkles, prevents foil breakage, maintains the surface density and compaction density of the coating, and does not affect battery performance.
Smart Images
Figure CN223858138U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the pole piece processing technical field especially relates to a pole piece roll press. BACKGROUND
[0002] At present, in the lithium battery production process, in order to improve the volume specific capacity of battery, the pole piece after coating operation needs to be rolled, thereby improving the area density and the compaction density of coating.
[0003] From above, the coating area on the pole piece is provided with a foil area, and the foil area is adhered with foil, wherein the foil can be aluminum foil or copper foil, etc., in the rolling process, because the pressure applied by the roller shaft to the pole piece is high, therefore, under the extrusion of the coating, the foil is prone to wrinkling, that is, the foil is prone to wrinkle, and then, when the pulling force is applied to the pole piece to take away the pole piece, the foil with wrinkle is prone to breakage.
[0004] In order to avoid the above problems, the existing technology usually adopts the way of reducing the rolling pressure or attaching Teflon on the flattening shaft located downstream of the roller shaft, wherein reducing the rolling pressure will affect the area density and the compaction density of the coating, thereby affecting the performance of the battery, and although attaching Teflon will increase the tension applied by the flattening shaft to the pole piece, thereby increasing the stretching force applied to the pole piece to improve the wrinkling problem of the foil, but the stretching force increased by attaching Teflon is small, and the improvement of the wrinkling problem of the foil is not obvious. UTILITY MODEL CONTENTS
[0005] The utility model aims at providing a pole piece roll press to fully improve the wrinkling problem of the foil, thereby avoiding the breakage of the foil, and without affecting the area density and the compaction density of the coating.
[0006] In order to achieve this purpose, the utility model adopts the following technical scheme:
[0007] The pole piece roll press comprises a first roller shaft and a second roller shaft, the first roller shaft and the second roller shaft are arranged in parallel, the pole piece can pass between the first roller shaft and the second roller shaft, and the pole piece roll press further comprises:
[0008] A first flattening shaft is arranged downstream of the first roller shaft and the second roller shaft along the moving direction of the pole piece, the first flattening shaft is arranged in parallel with the first roller shaft and the second roller shaft, and can push against the top surface or the bottom surface of the pole piece, a first protruding strip and a second protruding strip are protruded on the first flattening shaft, the first protruding strip and the second protruding strip are arranged along the axial direction of the first flattening shaft, and both spiral around the axis of the first flattening shaft, and the rotation directions of the first protruding strip and the second protruding strip are opposite.
[0009] As preferred, the first and second protruding strips are symmetrically arranged, and the symmetry plane is perpendicular to the axis of the first flattening shaft and passes through the center point of the first flattening shaft.
[0010] As preferred, the first protruding strip spirally extends to one end of the first flattening shaft from the side away from the second protruding strip, and the second protruding strip spirally extends to the other end of the first flattening shaft from the side away from the first protruding strip.
[0011] As preferred, a third protruding strip is protruded at the middle part of the first flattening shaft, the third protruding strip is annular, and the axis of the third protruding strip coincides with the axis of the first flattening shaft.
[0012] The first protruding strip spirally extends to the end of the first flattening shaft from the third protruding strip, and the second protruding strip spirally extends to the end of the first flattening shaft from the third protruding strip.
[0013] As preferred, along the axial direction of the first flattening shaft, the component of the frictional force between the first protruding strip and the pole piece in the direction is equal to the component of the frictional force between the second protruding strip and the pole piece in the direction, and is less than the minimum force required to pull the foil on the pole piece to break.
[0014] As preferred, the pole piece rolling machine further comprises a second flattening shaft, which is located upstream of the first and second rolling shafts along the moving direction of the pole piece, is arranged in parallel with the first flattening shaft, and is capable of pushing against the top surface or the bottom surface of the pole piece, a fourth protruding strip and a fifth protruding strip are protruded on the second flattening shaft, the fourth and fifth protruding strips are arranged along the axial direction of the second flattening shaft, and both spirally extend around the axis of the second flattening shaft, and the fourth and fifth protruding strips are opposite in rotation direction.
[0015] As preferred, the fourth and fifth protruding strips are symmetrically arranged, and the symmetry plane is perpendicular to the axis of the second flattening shaft and passes through the center point of the second flattening shaft.
[0016] As preferred, the fourth protruding strip spirally extends to one end of the second flattening shaft from the side away from the fifth protruding strip, and the fifth protruding strip spirally extends to the other end of the second flattening shaft from the side away from the fourth protruding strip.
[0017] As preferred, a sixth protruding strip is protruded at the middle part of the second flattening shaft, the sixth protruding strip is annular, and the axis of the sixth protruding strip coincides with the axis of the second flattening shaft.
[0018] The fourth protruding strip is helically extended to the end of the second flattening shaft by the sixth protruding strip, and the fifth protruding strip is helically extended to the end of the second flattening shaft by the sixth protruding strip.
[0019] Preferably, the component of the friction force between the fourth protruding strip and the pole piece in the axial direction of the second flattening shaft is equal to the component of the friction force between the fifth protruding strip and the pole piece in the axial direction of the second flattening shaft, and is less than the minimum force required to break the foil on the pole piece.
[0020] The utility model discloses the beneficial effects of:
[0021] The utility model discloses a first protruding strip and a second protruding strip with opposite rotation directions are arranged on the first flattening shaft downstream of the first roller shaft and the second roller shaft, so that two pulling forces with opposite directions are applied to the pole piece when the foil area on the pole piece passes through the first flattening shaft, thereby the foil with the problem of wrinkling can be fully flattened, and the subsequent foil is prevented from being broken, and the utility model does not need to reduce the pressure applied to the pole piece by the first roller shaft and the second roller shaft, thereby the surface density and the compaction density of the coating layer are prevented from being affected, and the performance of the battery is prevented from being affected. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 It is the structure schematic diagram of pole piece in the utility model embodiment;
[0023] Figure 2 It is the structure schematic diagram of pole piece roller press in the utility model embodiment;
[0024] Figure 3 It is the top view of first flattening shaft in the utility model embodiment;
[0025] Figure 4 It is the force analysis diagram of pole piece in the utility model embodiment.
[0026] In the drawing:
[0027] 100, pole piece;110, coating area;120, foil area;121, foil;
[0028] 210, first roller shaft;220, second roller shaft;230, first flattening shaft;231, first protruding strip;2311, first inclined belt;232, second protruding strip;2321, second inclined belt;233, third protruding strip;234, first helical groove;2341, first reserved belt;235, second helical groove;2351, second reserved belt;240, second flattening shaft. DETAILED DESCRIPTION
[0029] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are merely intended to explain the utility model and not to limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.
[0030] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0031] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0032] In the description of the embodiment, the terms "upper", "lower", "right", "left" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only used to distinguish in description and have no special meaning.
[0033] As shown in Figure 1 The pole piece 100 is provided with a coating area 110 and a foil area 120, wherein the coating area 110 is divided into two areas, the foil area 120 is located between the two areas, and the foil material 121 is adhered in the foil area 120.
[0034] Please refer to Figures 2 to 4 , and in combination with Figure 1The embodiment provides an electrode sheet rolling machine, which comprises a first rolling shaft 210 and a second rolling shaft 220, the first rolling shaft 210 and the second rolling shaft 220 are arranged in parallel, and an electrode sheet 100 can pass between the first rolling shaft 210 and the second rolling shaft 220. Specifically, the moving direction of the electrode sheet 100 is perpendicular to the arrangement direction of two regions divided by a coating area 110. In the embodiment, the two regions divided by the coating area 110 are arranged in parallel along the width direction of the electrode sheet 100, the electrode sheet 100 can move along the length direction and pass between the first rolling shaft 210 and the second rolling shaft 220. It can be understood that the moving direction of the electrode sheet 100 is perpendicular to the axial direction of the first rolling shaft 210 and the axial direction of the second rolling shaft 220. When the electrode sheet 100 passes between the first rolling shaft 210 and the second rolling shaft 220, the first rolling shaft 210 and the second rolling shaft 220 can apply pressure to the electrode sheet 100, so as to roll the coating on the electrode sheet 100.
[0035] When the first rolling shaft 210 and the second rolling shaft 220 roll the electrode sheet 100, the foil 121 is prone to be wrinkled along the arrangement direction of the two regions divided by the coating area 110 due to the extrusion of the coating. In order to eliminate the wrinkles, in addition to the first rolling shaft 210 and the second rolling shaft 220, the electrode sheet rolling machine further comprises a first flattening shaft 230 in the embodiment. The first flattening shaft 230 is located downstream of the first rolling shaft 210 and the second rolling shaft 220 along the moving direction of the electrode sheet 100. The first flattening shaft 230 is arranged in parallel with the first rolling shaft 210 and the second rolling shaft 220, and can push against the bottom surface of the electrode sheet 100, so as to apply tension to the electrode sheet 100. The first flattening shaft 230 is provided with a first protruding strip 231 and a second protruding strip 232. The first protruding strip 231 and the second protruding strip 232 are arranged along the axial direction of the first flattening shaft 230, and both spiral around the axis of the first flattening shaft 230, and the first protruding strip 231 and the second protruding strip 232 are opposite in rotation direction.
[0036] When the foil retention area 120 on the electrode 100 passes the first flattening axis 230, the first protruding strip 231 and the second protruding strip 232 can apply frictional force to the electrode 100. The frictional force applied by the first protruding strip 231 to the electrode 100 can be decomposed into a first component force and a second component force. The direction of the first component force is parallel to the axial direction of the first flattening axis 230, and the direction of the second component force is perpendicular to the axial direction of the first flattening axis 230. The frictional force applied by the second protruding strip 232 to the electrode 100 can be decomposed into a third component force. The third component force is parallel to the axis of the first flattening axis 230, and the fourth component force is perpendicular to the axis of the first flattening axis 230. Moreover, the direction of the first component force is opposite to that of the third component force, while the direction of the second component force is the same as that of the fourth component force. The first and third component forces act as tensile forces, which can pull the electrode 100 and flatten the foil 121 with wrinkling problems. The second and fourth component forces are used to make the electrode 100 continue to move forward.
[0037] Specifically, along the length of the electrode 100, as the foil retention area 120 gradually passes the first flattening axis 230, the first flattening axis 230 can gradually flatten the foil 121 at various parts along the length of the electrode 100.
[0038] As described above, this embodiment provides a first protruding strip 231 and a second protruding strip 232 with opposite rotation directions on a first flattening shaft 230 located downstream of the first roller pressing shaft 210 and the second roller pressing shaft 220. When the foil retention area 120 on the electrode 100 passes through the first flattening shaft 230, two pulling forces with opposite directions are applied to the electrode 100. This can effectively flatten the foil 121 with wrinkling problems, thereby avoiding subsequent foil 121 breakage. Moreover, this embodiment does not require reducing the pressure applied to the electrode 100 by the first roller pressing shaft 210 and the second roller pressing shaft 220, thereby avoiding affecting the areal density and compaction density of the coating, and thus avoiding affecting the performance of the battery.
[0039] It is understood that in other alternative embodiments, the first flattening axis 230 may also be configured to push against the top surface of the electrode 100, and this embodiment does not impose specific limitations on this.
[0040] Furthermore, in this embodiment, the first protruding strip 231 and the second protruding strip 232 are symmetrically arranged, and the plane of symmetry is perpendicular to the axis of the first flattening axis 230 and passes through the center point of the first flattening axis 230, so that the first component force and the third component force can be symmetrical about the center line of the foil retention area 120. Moreover, it can be understood that, based on the prior art, the two regions divided by the coating area 110 are symmetrical about the center line of the electrode 100, that is, the center line of the foil retention area 120 is the center line of the electrode 100. Therefore, the magnitudes of the first component force and the second component force are equal. As such, this embodiment can more fully flatten the foil 121.
[0041] Specifically, the embodiment can make the center line of the foil-remaining area 120 located in the symmetry plane of the first protruding strip 231 and the second protruding strip 232, so that when the foil-remaining area 120 passes through the first flattening shaft 230, the first component force and the third component force can be symmetrical about the center line of the foil-remaining area 120, and the first component force and the second component force are equal in size, so that the foil 121 can be sufficiently flattened.
[0042] Based on the above, in the embodiment, the first protruding strip 231 extends away from the second protruding strip 232 on one side to one end of the first flattening shaft 230, and the second protruding strip 232 extends away from the first protruding strip 231 on one side to the other end of the first flattening shaft 230, so that the pole piece 100 of different sizes can be adapted.
[0043] Among them, for the pole piece 100 with smaller size, the pole piece 100 only covers the part of the first protruding strip 231 and the second protruding strip 232 close to the center position of the first flattening shaft 230.
[0044] And for the pole piece 100 with larger size, the side of the first protruding strip 231 and the second protruding strip 232 away from the center position of the first flattening shaft 230 can push against the edge position of the pole piece 100 along the width direction, so that the pulling force of the foil 121 can be applied to the middle position of the pole piece 100, and the pulling force of the foil 121 can be applied to the edge position of the pole piece 100 along the width direction, and the foil 121 with wrinkles on the pole piece 100 with larger size can be sufficiently flattened.
[0045] In addition, the middle part of the first flattening shaft 230 is provided with a third protruding strip 233, the third protruding strip 233 is annular, and the axis of the third protruding strip 233 coincides with the axis of the first flattening shaft 230, the third protruding strip 233 can be used to support the foil-remaining area 120 when the pole piece 100 passes through the first flattening shaft 230, so as to avoid the foil-remaining area 120 from being deformed due to suspension, and further ensure that the first component force and the third component force only act as the pulling force for flattening the wrinkles on the foil 121, and do not act as the pulling force for restoring the foil-remaining area 120 to the original state.
[0046] Exemplarily, in the embodiment, the first flattening shaft 230 can push against the bottom surface of the pole piece 100, that is, when the pole piece 100 passes through the first flattening shaft 230, the first flattening shaft 230 is supported on the bottom of the pole piece 100, wherein the third protruding strip 233 can be used to support the foil-remaining area 120 when the pole piece 100 passes through the first flattening shaft 230, so as to avoid the foil-remaining area 120 from being downwardly sagged due to suspension, and further ensure that the first component force and the third component force only act as the pulling force for flattening the wrinkles on the foil 121, and do not act as the pulling force for restoring the foil-remaining area 120 to the horizontal state.
[0047] That is, by arranging the third protruding strip 233, the first component force and the third component force generated by the first protruding strip 231 and the second protruding strip 232 can be more fully used to flatten the foil 121.
[0048] From the above, in the present embodiment, the first protruding strip 231 is helically extended to the end of the first flattening shaft 230 by the third protruding strip 233, and the second protruding strip 232 is helically extended to the end of the first flattening shaft 230 by the third protruding strip 233.
[0049] Based on the above, in the present embodiment, along the axial direction of the first flattening shaft 230, the component force of the friction between the first protruding strip 231 and the pole piece 100 in this direction is equal to the component force of the friction between the second protruding strip 232 and the pole piece 100 in this direction, and is less than the minimum force required to break the foil 121 on the pole piece 100, that is, the first component force and the third component force are equal, and are less than the minimum force required to break the foil 121 on the pole piece 100. The minimum force required to break the foil 121 on the pole piece 100 is the minimum force required to break the foil 121 along the width direction of the pole piece 100.
[0050] Specifically, as shown in FIG. 6, the third protruding strip 233 is arranged on the first protruding strip 231 and the second protruding strip 232. Figure 3 and Figure 4As shown, the vertical direction projection view of the side of the first protruding strip 231 opposite to the pole piece 100 is composed of n first inclined strips 2311 arranged along the axial direction of the first flattening axis 230, when the pole piece 100 passes through the first flattening axis 230, n1 first inclined strips 2311 of the first protruding strip 231 are in contact with the pole piece 100, the first protruding strip 231 forms a first spiral groove 234 on the first flattening axis 230, the vertical direction projection view of the side of the first spiral groove 234 opposite to the pole piece 100 is composed of n first empty strips 2341 arranged along the axial direction of the first flattening axis 230, wherein the first empty strip 2341 adjacent to the third protruding strip 233 and the first empty strip 2341 adjacent to the end of the first flattening axis 230 are right-angled triangles, correspondingly, the vertical direction projection view of the side of the second protruding strip 232 opposite to the pole piece 100 is composed of n second inclined strips 2321 arranged along the axial direction of the first flattening axis 230, when the pole piece 100 passes through the first flattening axis 230, n1 second inclined strips 2321 of the second protruding strip 232 are in contact with the pole piece 100, the second protruding strip 232 forms a second spiral groove 235 on the first flattening axis 230, the vertical direction projection view of the side of the second spiral groove 235 opposite to the pole piece 100 is composed of n second empty strips 2351 arranged along the axial direction of the first flattening axis 230, wherein the second empty strip 2351 adjacent to the third protruding strip 233 and the second empty strip 2351 adjacent to the end of the first flattening axis 230 are right-angled triangles, in this embodiment, the width of the first inclined strip 2311 and the second inclined strip 2321 along the axial direction of the first flattening axis 230 is L1, the width of the third protruding strip 233 along the axial direction of the first flattening axis 230 is L2, the width of the middle first empty strip 2341 along the axial direction of the first flattening axis 230 is L3, the base length of the outermost two first empty strips 2341 is also L3, the width of the middle second empty strip 2351 along the axial direction of the first flattening axis 230 is L3, the base length of the outermost two second empty strips 2351 is also L3, the angle between the first inclined strip 2311 and the second inclined strip 2321 and the axis of the first flattening axis 230 is θ, the diameter of the first flattening axis 230 is a, and the axial length of the first flattening axis 230 is b.
[0051] In addition, the minimum force required to break the foil 121 on the pole piece 100 is F1, the tension applied by the first flattening shaft 230 to the pole piece 100 is F2, the friction coefficient between the first protruding strip 231 and the pole piece 100 and the friction coefficient between the second protruding strip 232 and the pole piece 100 are both μ, the friction force between the part of the first protruding strip 231 where the first inclined belt 2311 is formed and the pole piece 100 is F3, the component of F3 in the axial direction of the first flattening shaft 230 is f1, the component of F3 in the radial direction of the first flattening shaft 230 is f2, the friction force between the part of the second protruding strip 232 where the second inclined belt 2321 is formed and the pole piece 100 is F4, the component of F4 in the axial direction of the first flattening shaft 230 is f3, and the component of F4 in the radial direction of the first flattening shaft 230 is f4, wherein f1 = f3 and f2 = f4, the first component force is composed of n f1, the second component force is composed of n f2, the third component force is composed of n f3, and the fourth component force is composed of n f4.
[0052] From the above, in the present embodiment:
[0053]
[0054] n1*f1 = n1*F3*cosθ < F1.
[0055] That is, in the present embodiment, the parameters of the first flattening shaft 230 need to satisfy the above conditions.
[0056] In addition, as shown in Figure 2 illustrated, it is worth noting that since part of the pole piece 100 has already been wrinkled when it is received, to avoid the subsequent rolling of the first roller 210 and the second roller 220 aggravating the wrinkles of the foil 121, thereby causing the first flattening shaft 230 to be unable to completely flatten the foil 121, in the present embodiment, the pole piece rolling machine further comprises a second flattening shaft 240, which is located upstream of the first roller 210 and the second roller 220 along the moving direction of the pole piece 100, is arranged in parallel with the first flattening shaft 230, and is capable of abutting against the bottom surface of the pole piece 100, and the fourth protruding strip (not shown in the figure) and the fifth protruding strip (not shown in the figure) are protrudingly arranged on the second flattening shaft 240, the fourth protruding strip and the fifth protruding strip are arranged along the axial direction of the second flattening shaft 240, both of them extend spirally around the axis of the second flattening shaft 240, and the fourth protruding strip and the fifth protruding strip are opposite in rotation direction.
[0057] From the above, for the pole piece 100 flowing to the first roller 210 and the second roller 220, the second flattening shaft 240 can first flatten the foil 121 on the pole piece 100, thereby ensuring that the first flattening shaft 230 only flattens the foil 121 wrinkled by rolling in the subsequent process, and further ensuring that the first flattening shaft 230 can sufficiently flatten the foil 121 that has the problem of wrinkling.
[0058] It can be understood that the second flattening shaft 240 has the same structure design and working principle as the first flattening shaft 230, and thus the embodiment will not be described here.
[0059] In addition, it can also be understood that in other optional embodiments, the second flattening shaft 240 can also be arranged to push against the top surface of the pole piece 100, and the embodiment will not be specifically limited.
[0060] Further, the fourth protruding strip and the fifth protruding strip are symmetrically arranged, and the symmetry plane is perpendicular to the axis of the second flattening shaft 240 and passes through the center point of the second flattening shaft 240, so that when the foil area 120 passes through the second flattening shaft 240, the component force of the fourth protruding strip applied to the pole piece 100 along the axial direction of the second flattening shaft 240 and the component force of the fifth protruding strip applied to the pole piece 100 along the axial direction of the second flattening shaft 240 can be symmetrical about the center line of the foil area 120, and the two component forces are equal in size, so that the foil material 121 can be fully flattened.
[0061] Based on the above, the fourth protruding strip extends helically to one end of the second flattening shaft 240 away from the fifth protruding strip, and the fifth protruding strip extends helically to the other end of the second flattening shaft 240 away from the fourth protruding strip, so as to adapt to pole pieces 100 of different sizes.
[0062] It can be understood that the second flattening shaft 240 has the same structure design and working principle as the first flattening shaft 230, and thus the embodiment will not be described here.
[0063] In addition, the middle part of the second flattening shaft 240 is provided with a sixth protruding strip (not shown in the figure), the sixth protruding strip is annular, and the axis of the sixth protruding strip coincides with the axis of the second flattening shaft 240. The sixth protruding strip can be used to support the foil area 120 when the pole piece 100 passes through the second flattening shaft 240, so as to avoid deformation of the foil area 120 due to suspension, thereby ensuring that the component force of the fourth protruding strip applied to the pole piece 100 along the axial direction of the second flattening shaft 240 and the component force of the fifth protruding strip applied to the pole piece 100 along the axial direction of the second flattening shaft 240 only act as the tension to flatten the wrinkles on the foil material 121, and do not act to pull the foil area 120 back to the original state.
[0064] Based on the above, in the embodiment, the fourth protruding strip is helically extended to the end of the second flattening shaft 240 by the sixth protruding strip, and the fifth protruding strip is helically extended to the end of the second flattening shaft 240 by the sixth protruding strip.
[0065] Similarly to the first flattening axis 230, the component of the friction force between the fourth protruding strip and the pole piece 100 in the axial direction of the second flattening axis 240 is equal to the component of the friction force between the fifth protruding strip and the pole piece 100 in the axial direction of the second flattening axis 240, and is less than the minimum force required to break the foil 121 on the pole piece 100.
[0066] It can be understood that the design principles of the parameters of the second flattening axis 240 are the same as those of the first flattening axis 230, and thus, the present embodiment will not be described again.
[0067] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.
Claims
1. A pole piece rolling machine comprising a first rolling shaft (210) and a second rolling shaft (220), the first rolling shaft (210) and the second rolling shaft (220) are arranged in parallel, a pole piece (100) can pass between the first rolling shaft (210) and the second rolling shaft (220), characterized in that, The pole piece rolling machine further comprises: A first flattening shaft (230) is arranged downstream of the first rolling shaft (210) and the second rolling shaft (220) along the moving direction of the pole piece (100), and is arranged in parallel with the first rolling shaft (210) and the second rolling shaft (220), and can push against the top surface or the bottom surface of the pole piece (100), and a first protruding strip (231) and a second protruding strip (232) are protruded on the first flattening shaft (230), the first protruding strip (231) and the second protruding strip (232) are arranged along the axial direction of the first flattening shaft (230), and are both helically extended around the axis of the first flattening shaft (230), and the first protruding strip (231) and the second protruding strip (232) are opposite in rotation direction.
2. The pole piece roll press of claim 1, wherein, The first protruding strip (231) and the second protruding strip (232) are symmetrically arranged, and the symmetry plane is perpendicular to the axis of the first flattening shaft (230) and passes through the center point of the first flattening shaft (230).
3. The pole piece roll press of claim 2, wherein, The first protruding strip (231) is helically extended to one end of the first flattening shaft (230) away from the second protruding strip (232), and the second protruding strip (232) is helically extended to the other end of the first flattening shaft (230) away from the first protruding strip (231).
4. The pole piece roll press of claim 3, wherein, A third protruding strip (233) is protruded on the middle part of the first flattening shaft (230), the third protruding strip (233) is annular, and the axis of the third protruding strip (233) coincides with the axis of the first flattening shaft (230); The first protruding strip (231) is helically extended to the end of the first flattening shaft (230) by the third protruding strip (233), and the second protruding strip (232) is helically extended to the end of the first flattening shaft (230) by the third protruding strip (233).
5. The pole piece roll press of claim 2, wherein, Along the axial direction of the first flattening shaft (230), the component of the frictional force between the first protruding strip (231) and the pole piece (100) in the direction is equal to the component of the frictional force between the second protruding strip (232) and the pole piece (100) in the direction, and is less than the minimum force required to break the foil (121) on the pole piece (100).
6. The pole piece roll press of claim 1, wherein, The pole piece rolling machine further comprises a second flattening shaft (240) arranged upstream of the first rolling shaft (210) and the second rolling shaft (220) along the moving direction of the pole piece (100), and is arranged in parallel with the first flattening shaft (230), and can push against the top surface or the bottom surface of the pole piece (100), and a fourth protruding strip and a fifth protruding strip are protruded on the second flattening shaft (240), the fourth protruding strip and the fifth protruding strip are arranged along the axial direction of the second flattening shaft (240), and are both helically extended around the axis of the second flattening shaft (240), and the fourth protruding strip and the fifth protruding strip are opposite in rotation direction.
7. The pole piece roll press of claim 6, wherein, The fourth protruding strip and the fifth protruding strip are symmetrically arranged, and the symmetry plane is perpendicular to the axis of the second flattening shaft (240) and passes through the center point of the second flattening shaft (240).
8. The pole piece roll press of claim 7, wherein, The fourth protruding strip extends helically away from one side of the fifth protruding strip to one end of the second flattening shaft (240), and the fifth protruding strip extends helically away from one side of the fourth protruding strip to the other end of the second flattening shaft (240).
9. The pole piece roll press of claim 8, wherein, The middle part of the second flattening shaft (240) is provided with a sixth protruding strip, the sixth protruding strip is annular, and the axis of the sixth protruding strip coincides with the axis of the second flattening shaft (240). The fourth protruding strip is helically extended to the end of the second flattening shaft (240) by the sixth protruding strip, and the fifth protruding strip is helically extended to the end of the second flattening shaft (240) by the sixth protruding strip.
10. The pole piece roll press of claim 7, wherein, Along the axial direction of the second flattening shaft (240), the component of the friction force between the fourth protruding strip and the pole piece (100) in this direction is equal to the component of the friction force between the fifth protruding strip and the pole piece (100) in this direction, and is less than the minimum force required to break the foil (121) on the pole piece (100).