Battery pole piece cutting mechanism and battery pole piece preparation device

Abstract

The utility model relates to the technical field of battery electrode preparation, in particular to a battery pole piece cutting mechanism and a battery pole piece preparation device. According to the cutting mechanism of the battery pole piece, diaphragm cutting is divided into two steps, a cutting mark is obtained by cutting the diaphragm through a cutter firstly, the cutting mark is that a body area and an edge cutting area of the cut diaphragm are not completely cut off, and therefore a cutting track is obtained, the edge rolling assembly rotates in the extending direction of the cutting mark, and therefore the edge cutting area of the diaphragm is torn by the edge rolling assembly along the cutting track; therefore, the main body of the diaphragm cannot be broken, the cutting track is neat, the obtained cut edge is smooth, and the performance of the pole piece in the using process is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery electrode preparation technical field especially relates to a cutting mechanism of battery pole piece and battery pole piece preparation device. BACKGROUND

[0002] Dry electrode process is a new process of manufacturing lithium ion battery, no solvent is used in the manufacturing process of electrode, usually the positive / negative active material, conductive agent and solid binder are mixed and then rolled into a film, then the film is combined with the current collector to form the pole piece. However, the edges of the film are uneven after rolling, so the edges of the film need to be cut before being combined with the current collector, but the current cutting method is unstable, the cutting knife will tear the normal material area and cause the film to be damaged, and the cutting edge is uneven, which will cause performance problems of the combined pole piece during use.

[0003] Therefore, there is an urgent need for a cutting mechanism of battery pole piece to solve the above technical problems. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a cutting mechanism of battery pole piece and a battery pole piece preparation device, which can cut the edges of the film and make the cutting edges flat.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] In the first aspect, a cutting mechanism of battery pole piece is provided, which comprises:

[0007] A cutting knife is used to cut a film to form a cutting mark, and the cutting mark is used to divide the film into a main body area and a cutting edge area.

[0008] A cutting assembly comprises a roll edge assembly that can be rotated, the roll edge assembly rotates towards the extension direction of the cutting mark, and the roll edge assembly separates the main body area and the cutting edge area of the film along the extension direction of the cutting mark.

[0009] In the second aspect, a battery pole piece preparation device is provided, which comprises the cutting mechanism of battery pole piece according to any one of the above solutions.

[0010] The utility model has at least the following beneficial effects:

[0011] The cutting mechanism of the battery pole piece and the battery pole piece preparation device provided by the embodiment of the utility model, the cutting mechanism of the battery pole piece divides the cutting film piece into two steps, the cutting knife cuts the film piece first to obtain a cutting mark, the cutting mark is that the body area and the cutting edge area of the cutting film piece are not completely cut off after cutting, so that the cutting track is obtained, because the rolling edge assembly rotates towards the extension direction of the cutting mark, so the cutting edge area of the film piece is torn by the rolling edge assembly along the cutting track, so the main body of the film piece will not be broken, and the cutting track is neat, so that the obtained cutting edge is flat, and the performance of the pole piece in the use process is guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed to be used in the description of the embodiment of the utility model will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the content of the embodiment of the utility model and the drawings for the ordinary skilled in the art without creating labor.

[0013] Figure 1 The first perspective view of the structure of the cutting mechanism of the battery pole piece provided by the embodiment of the utility model is shown in the figure.

[0014] Figure 2 The second perspective view of the structure of the cutting mechanism of the battery pole piece provided by the embodiment of the utility model is shown in the figure.

[0015] In the figure:

[0016] 1, cutting knife; 2, cutting assembly; 21, rolling edge assembly; 22, rocker arm; 23, adjusting structure; 231, guide rod; 232, elastic piece; 233, positioning rod; 24, first driving structure; 3, second driving structure; 4, support frame; 6, first position adjusting assembly; 7, second position adjusting assembly; 8, edge suction assembly. DETAILED DESCRIPTION

[0017] The utility model will be further described in detail in combination with the drawings and embodiments. It can be understood that the specific embodiments described here are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that in order to facilitate the description, only the parts related to the utility model are shown in the drawings, not all the structures.

[0018] In the description of the utility model, unless another definite provision and limitation, the term "connect", "connection", "fixed" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two element interaction relationship.For the ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0019] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional features between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the first feature horizontal height is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the first feature horizontal height is less than the second feature.

[0020] In the description of the embodiment, the terms "on", "under", "right", etc. Orientation or positional relationship is based on the orientation or positional relationship shown in the drawing, only for the convenience of description and simplification operation, and does 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", "second" are only used to distinguish in the description, and have no special meaning.

[0021] The battery pole piece is formed by the current collector and the film sheet located on the two sides of the current collector.The film sheet is rolled by the rolling equipment, the edge is not neat in the rolling forming process, and the width is greater than the actual required width, so that the cutting mechanism is needed to cut the edge, and the cutting mechanism is arranged opposite to the pressure roller for conveying the film sheet, and the edge cutting operation is carried out on the film sheet passing through the pressure roller.

[0022] As shown in Figure 1 and Figure 2 The cutting mechanism of the battery pole piece includes a cutting knife 1 and a cutting assembly 2, wherein the cutting knife 1 is used for cutting on the film sheet to form a cutting mark; the cutting mark is used for dividing the film sheet into a main body area and a cutting edge area.The cutting assembly 2 includes a turnable edge rolling assembly 21, the edge rolling assembly 21 rotates towards the extension direction of the cutting mark, and the edge rolling assembly 21 separates the main body area and the cutting edge area of the film sheet along the extension direction of the cutting mark.

[0023] The cutting mark is a line that the main body area and the cutting edge area of the film sheet after cutting are not completely cut off.

[0024] The cutting mechanism of the battery pole piece provided by the embodiment of the utility model cuts the film piece into two steps, the film piece is cut by the cutter 1 to obtain a cutting trace, the edge of the film piece is rolled by the rolling assembly 21 along the cutting trace, the main body of the film piece is not broken, the cutting trace is neat, and the cutting edge obtained is flat, and the performance of the pole piece in the use process is guaranteed.

[0025] In some embodiments, the rolling assembly 21 comprises a roller and a cutting piece arranged on the outer circumferential surface of the roller, the roller rotates towards the extension direction of the cutting trace, and the cutting piece contacts the cutting edge area of the film piece to cut off the cutting edge area. The cutting purpose of the cutting edge area by the cutting piece in the form of milling can be guaranteed, the cutting edge area and the main body area are separated along the cutting trace, and the cutting purpose is realized, the cutting edge of the main body area is more flat, and the main body area is not damaged.

[0026] In some embodiments, the cutting piece comprises a plurality of brushes, and the plurality of brushes are arranged on the circumferential side wall of the rolling assembly 21. The plurality of brushes can contact the film piece when the rolling assembly 21 rotates, so as to realize the contact between the cutting piece and the film piece in real time and improve the cutting efficiency.

[0027] In other embodiments, the cutting piece comprises a plurality of strip-shaped cutters, the strip-shaped cutters are arranged on the circumferential side wall of the rolling assembly 21, the length extension direction of the plurality of strip-shaped cutters is the same as the axial direction of the rolling assembly 21 or the length extension direction of the strip-shaped cutters is arranged at an acute angle with the axial direction of the rolling assembly 21, so as to improve the contact area between the cutting piece and the cutting edge area and improve the cutting efficiency. In addition, the plurality of strip-shaped cutters can contact the film piece when the rolling assembly 21 rotates, so as to realize the contact between the cutting piece and the film piece in real time and improve the cutting efficiency. For example, the strip-shaped cutter can be a metal cutter or a non-metal cutter.

[0028] Further, the cutting piece is uniformly arranged along the circumference of the rolling assembly 21, so as to improve the cutting efficiency and cutting quality. In this way, the rolling assembly 21 and the cutting piece are equivalent to a milling cutter, the edge of the film piece is milled, and the purpose of cutting the edge of the film piece is realized.

[0029] In order to support the cutter 1 and the cutting assembly 2, so as to fix the position of the cutter 1 and the cutting assembly 2 relative to the film piece, in some embodiments, the cutting mechanism of the battery pole piece further comprises a support frame 4, the cutter 1 and the cutting assembly 2 are installed on the support frame 4, so as to adaptively limit the position of the cutter 1 and the cutting mechanism, and the cutting quality is guaranteed.

[0030] In some embodiments, the cutting assembly 2 further comprises a rocker arm 22 and an adjusting structure 23, one end of the rocker arm 22 away from the film is movably connected with the support frame 4 through the adjusting structure 23, and the adjusting structure 23 is used for adjusting the relative position of the rocker arm 22 and the film, so as to enable the rocker arm 22 to always fit the cutting edge area of the film. Since the one end of the rocker arm 22 close to the film is connected with the rolling assembly 21, the adjusting structure 23 adjusts the relative position of the rocker arm 22 and the film, and the position between the rolling assembly 21 and the film is adjusted.

[0031] Specifically, the adjusting structure 23 comprises a guide rod 231 and an elastic member 232, the rocker arm 22 is movably connected with the support frame 4 through the guide rod 231, so as to enable the rocker arm 22 to move along the axial direction of the guide rod 231, and avoid the rocker arm 232 from being stuck during sliding with the support frame 4. The two ends of the elastic member 232 are respectively abutted with the one end of the rocker arm 22 away from the film and the support frame 4. When the film presses the rolling assembly 21, the pressing force of the rolling assembly 21 is transmitted to the rocker arm 22, and the rocker arm 22 is pushed to move to the direction of the elastic member 232. Since the elastic member 232 always has a tendency to push the rocker arm 22 to move to the film, that is, the elastic member 232 is in a compressed state, the elastic member 232 is pressed to slow down the movement speed of the rocker arm 22. The above setting can ensure that the rolling assembly 21 always keeps contact with the film under the premise of stable movement speed, so as to prevent the rolling assembly 21 from separating from the film due to too fast descending speed. In addition, when the thickness of the film changes, the rocker arm 22 moves to the film under the action of the elastic member 232, so as to ensure that the rolling assembly 21 always fits the film. In addition, the above setting can adapt to the cutting needs of films with different thicknesses.

[0032] For example, the elastic member 232 is a spring, and the spring is limited between the rocker arm 22 and the support frame 4 through a positioning rod 233, so as to avoid the spring from being separated from the rocker arm 22 and the support frame 4.

[0033] Meanwhile, the rocker arm 22 and the support frame 4 are also slidably connected through a slide rail and a slide block structure. Specifically, the rocker arm 22 is fixedly connected with the slide block, the support frame 4 is fixedly connected with the slide rail, and the slide block is slidably connected with the slide rail. In this way, the sliding of the rocker arm 22 on the support frame 4 can be realized. When the rocker arm 22 moves relative to the support frame 4 under the action of the adjusting structure 23, the slide rail and the slide block structure are used for guiding the rocker arm 22.

[0034] In some embodiments, the cutting assembly 2 further comprises a first driving structure 24, the first driving structure 24 is installed on the support frame 4, and the first driving structure 24 is connected with the rolling assembly 21 to drive the rolling assembly 21 to rotate. For example, the first driving structure 24 is a motor belt transmission structure, so as to drive the rolling assembly 21 to rotate. The motor belt transmission structure is a prior art, and will not be described here.

[0035] Of course, in other embodiments, the first driving structure 24 is a motor gear transmission structure to drive the rolling assembly 21 to rotate. The motor gear transmission structure is a prior art and will not be described here.

[0036] The rotating speed of the rolling assembly 21 is greater than the conveying speed of the film sheet to ensure the cutting quality.

[0037] In some embodiments, the cutting knife 1 is a circular cutting knife, and the edge of the cutting knife 1 has a blade. When the cutting knife 1 cuts the film sheet, the cutting mark can be neat.

[0038] The cutting mechanism of the battery pole piece further comprises a second driving structure 3 connected with the cutting knife 1 to drive the cutting knife 1 to rotate. The rotating direction of the cutting knife 1 is opposite to the conveying direction of the film sheet to ensure that the film sheet can be normally cut and improve the cutting efficiency. For example, the second driving structure 3 can be a motor belt transmission structure. The motor belt transmission assembly is a prior art and will not be described here. Of course, in other embodiments, the second driving structure 3 is a motor gear transmission structure to drive the rolling assembly 21 to rotate. The motor gear transmission structure is a prior art and will not be described here.

[0039] The cutting mechanism of the battery pole piece further comprises a first position adjusting assembly 6 used to adjust the distance between the cutting knife 1 and the film sheet. The first position adjusting assembly 6 can make the blade close to or away from the film sheet and can also adapt to the cutting of film sheets with different thicknesses.

[0040] Specifically, the support frame 4 is connected with the first position adjusting assembly 6, and the cutting knife 1 and the cutting assembly 2 are fixedly installed on the support frame 4. That is, the first position adjusting assembly 6 can simultaneously adjust the positions of the cutting knife 1 and the cutting assembly 2 to adapt to the cutting requirements of film sheets with different thicknesses.

[0041] For example, the first position adjusting assembly 6 can comprise a first bearing frame, a first transmission member, a first lead screw, and a first nut. The first lead screw is rotatably installed on the support frame 4, the first transmission member is installed on the support frame 4, the first transmission member is connected with the first lead screw, the first lead screw is threadedly connected with the first nut, the first nut is connected with the support frame 4 to drive the support frame 4 to move linearly, and the first transmission member comprises a motor. Of course, in other embodiments, the first position adjusting assembly 6 can comprise a pneumatic cylinder.

[0042] In some embodiments, the cutting mechanism of the battery pole piece further comprises a second position adjusting assembly 7, the first position adjusting assembly 6 is installed on the second position adjusting assembly 7, and the second position adjusting assembly 7 is used to drive the first position adjusting assembly 6 to move along the width direction of the film, thereby driving the cutting knife 1 and the cutting assembly 2 to move along the width direction of the film, so as to adapt to the edge cutting of the film with different widths. For example, the second position adjusting assembly 7 can comprise a second bearing frame, a second transmission member, a second lead screw, a second nut and a sliding rail slider, the second lead screw is rotatably installed on the second bearing frame, the second transmission member is installed on the second bearing frame, the second transmission member is connected with the second lead screw, the second lead screw is threadedly connected with the second nut, the second nut is connected with the first bearing frame to drive the first bearing frame to move linearly, and the second transmission member comprises a motor. Of course, in other embodiments, the first position adjusting assembly 6 can comprise a pneumatic cylinder.

[0043] The moving direction of the support frame 4 is perpendicular to the moving direction of the first bearing frame.

[0044] In some embodiments, after the edge of the film is cut, the cut edge will fly around with the rotation of the film and the rolling assembly 21, and thus will be wound on the rollers. Therefore, the cutting mechanism of the battery pole piece further comprises an edge suction assembly 8 for sucking the cut edge, the edge suction assembly 8 is installed on the support frame 4 and is arranged at both ends of the film respectively. The edge suction assembly 8 can suck and collect the cut edge, so as to prevent the cut edge from flying around and affecting the subsequent process due to the film sucking the cut edge.

[0045] For example, the edge suction assembly 8 comprises a vacuum pump and a suction cover, the vacuum pump provides negative pressure for the suction cover, and the suction cover is arranged directly below the rolling assembly 21, so as to collect the cut edge.

[0046] The suction cover has an avoiding groove for avoiding the cutting knife 1 and the second driving structure 3, the avoiding groove is communicated with the opening of the suction cover, so that part of the cutting knife 1 and part of the second driving structure 3 are located in the area surrounded by the suction cover, and the edge suction quality is further improved.

[0047] It can be understood that the above-mentioned film can be a film that has not been thinned, that is, a thick film, or a formed film after calendering.

[0048] The utility model further provides a battery pole piece preparation device which comprises the cutting mechanism of the battery pole piece provided by the utility model.

[0049] In addition, the above is only the preferred embodiment of the present application and the applied technical principle. The person skilled in the art can understand that the present application is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments and substitutions can be made by the person skilled in the art without departing from the protection scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and more other equivalent embodiments can be included without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A cutting mechanism for battery electrodes, characterized in that, include: A cutter (1) is used to cut a slit on a membrane to form a slit, the slit being used to divide the membrane into a main body area and a cut edge area; The cutting assembly (2) includes a rotatably configured edge-rolling assembly (21) that rotates in the direction of the cut extension and separates the main body area of ​​the film from the cut edge area along the direction of the cut extension.

2. The battery electrode cutting mechanism according to claim 1, characterized in that, The edge-rolling assembly (21) includes a roller and a cutting element disposed on the outer peripheral surface of the roller. The roller rotates in the direction of the extension of the cut and the cutting element contacts the cut edge area of ​​the film.

3. The battery electrode cutting mechanism according to claim 2, characterized in that, The cutting component includes brushes, with multiple brushes arranged circumferentially on the circumferential sidewalls of the roller; or, The cutting component includes multiple strip-shaped cutters, which are disposed on the circumferential sidewall of the roller. The length extension direction of the multiple strip-shaped cutters is either in the same direction as the axial direction of the roller or at an acute angle.

4. The battery electrode cutting mechanism according to any one of claims 1-3, characterized in that, The cutting mechanism for the battery electrode also includes a support frame (4), and the cutter (1) and the cutting assembly (2) are mounted on the support frame (4).

5. The battery electrode cutting mechanism according to claim 4, characterized in that, The cutting assembly (2) further includes a rocker arm (22) and an adjustment structure (23). The end of the rocker arm (22) facing away from the diaphragm is movably connected to the support frame (4) through the adjustment structure (23). The end of the rocker arm (22) close to the diaphragm is connected to the edge-rolling assembly (21). The adjustment structure (23) is used to adjust the relative position of the rocker arm (22) and the diaphragm.

6. The battery electrode cutting mechanism according to claim 5, characterized in that, The adjustment structure (23) includes a guide rod (231) and an elastic element (232). The rocker arm (22) is movably connected to the support frame (4) through the guide rod (231). The two ends of the elastic element (232) abut against the end of the rocker arm (22) away from the diaphragm and the support frame (4), respectively. The elastic element (232) always has the tendency to push the rocker arm (22) toward the diaphragm.

7. The battery electrode cutting mechanism according to claim 5, characterized in that, The cutting assembly (2) further includes a first driving structure (24), which is mounted on the support frame (4) and is connected to the edge rolling assembly (21) to drive the edge rolling assembly (21) to rotate.

8. The battery electrode cutting mechanism according to claim 5, characterized in that, The rotational speed of the edge-rolling assembly (21) is greater than the conveying speed of the diaphragm.

9. The battery electrode cutting mechanism according to claim 4, characterized in that, The cutting mechanism for the battery electrode sheet further includes a first position adjustment component (6), which is used to adjust the distance between the cutter (1) and the diaphragm.

10. The battery electrode cutting mechanism according to claim 9, characterized in that, The support frame (4) is connected to the first position adjustment component (6), and the cutter (1) and the cutting component (2) are both fixedly installed on the support frame (4).

11. The battery electrode cutting mechanism according to claim 9, characterized in that, The cutting mechanism for the battery electrode also includes a second position adjustment component (7), wherein the first position adjustment component (6) is mounted on the second position adjustment component (7), and the second position adjustment component (7) is used to drive the first position adjustment component (6) to move along the width direction of the film.

12. The battery electrode cutting mechanism according to claim 4, characterized in that, The cutter (1) is a circular cutter with a cutting edge. The cutting mechanism of the battery electrode also includes a second driving structure (3), which is connected to the cutter (1) to drive the cutter (1) to rotate. The rotation direction of the cutter (1) is opposite to the conveying direction of the membrane.

13. The battery electrode cutting mechanism according to any one of claims 1-3, characterized in that, The cutting mechanism of the battery electrode sheet also includes an edge suction assembly (8) for adsorbing the cut edge, which is mounted on the support frame (4).

14. A battery electrode preparation apparatus, characterized in that, Includes a battery electrode cutting mechanism as described in any one of claims 1-13.

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