CN115441038B

CN115441038B - Kneading flat head, cell kneading flat mechanism, cell and kneading flat method thereof

Info

Publication number: CN115441038B
Application number: CN202211401728.6A
Authority: CN
Inventors: 李彬; 张青文; 戴志芳
Original assignee: Ningde Amperex Technology Ltd
Current assignee: Ningde Amperex Technology Ltd
Priority date: 2022-11-10
Filing date: 2022-11-10
Publication date: 2023-03-28
Anticipated expiration: 2042-11-10
Also published as: CN115441038A

Abstract

The application discloses rub flat head, electric core rub flat mechanism, electric core and rub flat method thereof, rub the outer peripheral face of flat head and include that first rub plane, second rub plane and squeeze face. The first plane of rubbing is around first axis setting, and the first plane of rubbing is used for setting with the terminal surface laminating of electric core. The second kneading plane is arranged around the first axis and used for being attached to the side face of the battery cell, the projection of the second kneading plane in the first plane is located on the periphery of the projection of the first kneading plane in the first plane and is arranged at intervals, and the first plane is perpendicular to the first axis. The squeezing surface is arranged around the first axis, connected between the first kneading plane and the second kneading plane and used for corresponding to the junction of the end surface and the side surface. The design can solve the problem that a sharp-angled structure exists after the electric core is kneaded to be flat.

Description

Kneading flat head, cell kneading flat mechanism, cell and kneading flat method thereof

Technical Field

The application relates to the technical field of battery processing, in particular to a flat head kneading and cell kneading mechanism, a cell and a flat kneading method thereof.

Background

Before the cell of the battery is not flattened, the end part of the cell is not flat, and more sharp-angled structures can appear. In order to facilitate the subsequent welding of the current collecting plate at the end of the battery core and ensure the welding quality, the end of the battery core needs to be subjected to rubbing treatment. Traditional crew cut of rubbing is hardly rubbed the flat angle structure completely, and there is the closed angle structure in the side of electric core easily, makes electric core pack into the casing after, the protection is glued to the closed angle structure of electric core cathode department can be punctureed to with the contact of positive pole steel can, lead to electric core short circuit, seriously influence the security performance of electric core.

Disclosure of Invention

The embodiment of the application provides a rub flat head, electric core rub flat mechanism, electric core and rub flat method thereof, has solved the condition that there is the closed angle structure in electric core.

In a first aspect, an embodiment of the present application provides a flat-kneading head, where an outer peripheral surface of the flat-kneading head includes:

the first kneading plane is arranged around a first axis and used for being attached to the end face of the battery cell, and the first axis is a central axis of the kneading flat head;

a second kneading plane, which is arranged around the first axis and used for being attached to the side surface of the battery cell, wherein the projection of the second kneading plane in the first plane is positioned at the periphery of the projection of the first kneading plane in the first plane and is arranged at intervals, and the first plane is perpendicular to the first axis; and

the extrusion face, the extrusion face winds first axis sets up, just the extrusion face connect in first rub the plane with the second is rubbed between the plane, the extrusion face is used for corresponding the terminal surface with the side juncture sets up, the extrusion face includes two at least sub extrusion faces, each sub extrusion face all winds first axis sets up and more than two sub extrusion face is followed first axis direction connects gradually.

The beneficial effects of the embodiment of the application are as follows: will rub flat-headed outer peripheral face design for including first rub the plane, plane and the face of extrusion are rubbed to the second, the first terminal surface of rubbing plane laminating electric core, the side of plane laminating electric core is rubbed to the second, the juncture of face laminating electric core terminal surface and side, the all-round laminating extrusion to electric core tip has been realized, make the terminal surface and the side of electric core become smooth and tight reality, can effectively avoid the terminal surface and the side of electric core to produce the closed angle structure, thereby reduce the risk that the closed angle structure of electric core punctures the protection and glues, prevent electric core short circuit, the rate of excellence of electric core has been improved simultaneously, the security performance of electric core has been strengthened.

In some embodiments, a projection of each sub-squeezing surface in the second plane includes two first lines, the two first lines are located on two opposite sides of the first axis, extending directions of the first lines corresponding to two adjacent sub-squeezing surfaces are different, and the second plane is parallel to the first axis.

Based on the embodiment, the extrusion surface is designed to comprise a plurality of sub-extrusion surfaces, so that the combination form of more than two sub-extrusion surfaces is more diversified, the surface structure between the end surface and the side surface of the battery cell made by kneading and flatting is more diversified, and more use requirements can be met.

In some embodiments, two or more of the sub-pressing surfaces comprise:

the first line corresponding to the first sub-squeezing surface is a straight line, the first sub-squeezing surface is connected to the first kneading plane, and the first sub-squeezing surface is arranged at an included angle relative to the first kneading plane; and

the first lines corresponding to the second sub-squeezing surfaces are straight lines, the second sub-squeezing surfaces are connected between the first sub-squeezing surfaces and the second kneading plane, and the second sub-squeezing surfaces are arranged at included angles relative to the first sub-squeezing surfaces and the second kneading plane.

In some of these embodiments, the angle between the first sub-pressing surface and the first kneading plane is 90 °; and/or the included angle of the second sub-extrusion surface relative to the first sub-extrusion surface is 90 degrees; and/or the included angle of the second sub-squeezing surfaces relative to the second kneading plane is 90 degrees.

Based on the above embodiment, the design makes the tip of electric core form the step like this, and the tip structure is more regular level and smooth, does benefit to the follow-up processing of electric core.

In some embodiments, the first line corresponding to each of the sub-squeezing surfaces is one of a straight line and an arc line.

Based on the embodiment, the first lines corresponding to the sub-extrusion surfaces are straight lines, and the end parts of the battery cell can be kneaded into an inverted-right-angle structure; first lines that sub-extrusion face corresponds are pitch arc lines, can rub the tip of electricity core flat for the radius angle structure, and two kinds of schemes homoenergetic make the tip of rubbing the crew cut and laminating electricity core completely, guarantee the planarization and the compactness of electricity core terminal surface and side.

In some embodiments, the projection of the squeezing surface in the second plane includes two first straight lines, the two first straight lines are respectively located at two opposite sides of the first axis, the squeezing surface is arranged at an included angle relative to the first kneading plane and the second kneading plane, and the second plane is parallel to the first axis; or the like, or, alternatively,

the projection of the squeezing surface in the second plane comprises two first arc lines, the two first arc lines are respectively located on two opposite sides of the first axis, the squeezing surface is in smooth transition connection with the first kneading plane and the second kneading plane, and the second plane is parallel to the first axis.

Based on above-mentioned embodiment, including being located respectively with the projection of extrusion face in the second plane two first straight line lines or two first pitch arc lines of the relative both sides of first axis make the extrusion face evenly surround in the setting of first axis, when rotating to kneading peacetime to electric core, ensure that each position of electric core terminal surface and side can the atress even to the tip shape of electric core is levelly and smoothly more smooth.

In some embodiments, the first kneading plane gradually decreases in radial size from the end connected with the pressing surface to the end far away from the pressing surface in the first axial direction.

Based on the above embodiment, the first kneading plane is designed to have a conical shape.

In a second aspect, an embodiment of the present application provides a flat-bed machine is rubbed to electric core, includes:

at least one tumbling head as described above;

the rotary disc is provided with the flat kneading head;

the movable adjusting piece is connected with the flat head and is used for driving the flat head to move along a first direction, and the first direction is perpendicular to the central axis of the rotating disc; and

and the rotation adjusting piece is connected with the rotating disc and is used for driving the kneading head to rotate around a second direction, and the second direction is parallel to the central axis of the rotating disc.

The flat-bed machine structure is rubbed to electric core of this application embodiment has realized the all-round laminating extrusion to electric core tip, makes the terminal surface and the side of electric core become smooth and tight reality, can effectively avoid the terminal surface and the side of electric core to produce the closed angle structure.

In a third aspect, an embodiment of the present application provides a method for kneading and flattening a battery core, where the method for kneading and flattening the battery core uses the above-mentioned mechanism for kneading and flattening the battery core, and the method for kneading and flattening the battery core includes the following steps:

the first kneading plane is attached to the end face of the battery cell, and the rotation adjusting piece drives the kneading flat head to rotate around the second direction so as to drive the first kneading plane to rotate, so that the cylindrical end part of the battery cell is kneaded;

the movable adjusting piece drives the kneading flat head to move towards the direction close to the central axis of the battery cell, so that the second kneading plane is attached to the side face of the battery cell, and the extrusion face is attached to the junction of the end face and the side face and is kneaded flat.

In a fourth aspect, an embodiment of the present application provides a cylinder electric core, the cylinder electric core uses the foregoing the electric core rub flat-bed machine construct prepare and form, the cylinder electric core have terminal surface, side and connect in the terminal surface with connect the face between the side, it is one of step, radius angle or chamfer angle to connect the face.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic perspective structure diagram of a cell flattening mechanism provided in an embodiment of the present application;

fig. 2 is a schematic perspective view of an embodiment of a kneading block in the cell kneading mechanism shown in fig. 1;

fig. 3 is a cross-sectional view of the flat-headed laminated cell shown in fig. 2;

FIG. 4 is a cross-sectional view taken in the direction B-B of the kneading block shown in FIG. 2;

FIG. 5 is an enlarged view of the structure at A in FIG. 3;

fig. 6 is a schematic perspective structure diagram of another embodiment of the cell flattening mechanism shown in fig. 1;

FIG. 7 is a front view of the tack head shown in FIG. 6;

fig. 8 is a schematic perspective view of an embodiment of a battery cell provided in an embodiment of the present application;

fig. 9 is a front view of the cell shown in fig. 8;

fig. 10 is a schematic perspective view of a kneading head of the cell kneading mechanism shown in fig. 1 according to still another embodiment;

FIG. 11 is a front view of the tack head shown in FIG. 10;

fig. 12 is a schematic perspective structure diagram of another embodiment of a battery cell provided in an embodiment of the present application;

fig. 13 is a front view of the cell shown in fig. 12;

fig. 14 is a schematic structural diagram of a battery cell according to still another embodiment of the present application.

Reference numerals: 100. kneading a flat head; 110. first kneading a plane; 120. second kneading the plane; 130. extruding surface; 131. a sub-extrusion surface; 1311. a first line; 1312. a first sub-pressing surface; 1313. a second sub-pressing surface; a. a first axis; b. a second plane; 200. a cell rubbing mechanism; 210. rotating the disc; 300. an electric core; 310. an end face; 320. a side surface.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Before the cell of the battery is not flattened, the end part of the cell is not flat, and more sharp-angled structures can appear. In order to facilitate the subsequent welding of the current collecting plate at the end of the battery core and ensure the welding quality, the end of the battery core needs to be subjected to rubbing treatment. Traditional flat head of rubbing is hardly rubbed the closed angle structure flat completely, and there is the closed angle structure in the side of electric core easily, makes electric core pack into the casing after, and the protection is glued can be punctureed to the closed angle structure of electric core cathode department to with the contact of positive pole steel casing, lead to electric core short circuit, seriously influence the security performance of electric core. The embodiment of the application provides a flat head kneading and cell flattening mechanism, a cell and a flat head kneading method thereof, and aims to solve the problems.

In a first aspect, referring to fig. 1 and fig. 2, an embodiment of the present application provides a flat-kneading head 100, where the flat-kneading head 100 is used to press and fit an end of a battery cell 300 so as to knead the end of the battery cell 300. The outer peripheral surface of the kneading flat head 100 may include a first kneading plane 110, a second kneading plane 120, and a pressing plane 130.

Specifically, referring to fig. 2 and fig. 3, the first kneading plane 110 is disposed around the first axis a, and the first kneading plane 110 is configured to be attached to the end surface 310 of the battery cell 300. The second kneading plane 120 is disposed around the first axis a, and the second kneading plane 120 is configured to be attached to the side surface 320 of the battery cell 300, and a projection of the second kneading plane 120 in the first plane is located at a periphery of a projection of the first kneading plane 110 in the first plane and is spaced from the first kneading plane, where the first plane is perpendicular to the first axis a. The pressing surface 130 is arranged around the first axis a, and the pressing surface 130 is connected between the first kneading plane 110 and the second kneading plane 120, and the pressing surface 130 is arranged corresponding to the intersection of the end surface 310 and the side surface 320. Wherein the first axis a may be a central axis of the kneading head 100.

The outer peripheral surface of the flat head 100 is designed to comprise a first kneading plane 110, a second kneading plane 120 and an extrusion surface 130, the first kneading plane 110 is attached to the end surface 310 of the battery cell 300, the second kneading plane 120 is attached to the side surface 320 of the battery cell 300, the extrusion surface 130 is attached to the junction of the end surface 310 of the battery cell 300 and the side surface 320, the all-dimensional attaching extrusion of the end part of the battery cell 300 is realized, so that the end surface 310 and the side surface 320 of the battery cell 300 become smooth and compact, the sharp-angle structure of the end surface 310 and the side surface 320 of the battery cell 300 can be effectively avoided, the risk that the sharp-angle structure of the battery cell 300 punctures the protective adhesive is reduced, the short circuit of the battery cell 300 is prevented, the goodness of the battery cell 300 is improved, and the safety performance of the battery cell 300 is enhanced.

As can be appreciated, referring to fig. 2 and 4, the pressing surface 130 may include at least two sub-pressing surfaces 131. Each sub-squeezing surface 131 is arranged around the first axis a, and more than two sub-squeezing surfaces 131 are sequentially connected along the first axis a, the projection of each sub-squeezing surface 131 in the second plane b includes two first lines 1311, when viewed from the direction perpendicular to the second plane b, the two first lines 1311 are respectively located on two opposite sides of the first axis a, the extending directions of the first lines 1311 corresponding to two adjacent sub-squeezing surfaces 131 are different, and the second plane b is parallel to the first axis a. The combination form of the at least two sub-extrusion surfaces 131 is more diversified, the surface structure between the end surface 310 and the side surface 320 in the battery cell 300 made of the flat-rolled head 100 is more diversified, and more use requirements can be met. For example, a surface of the battery cell 300 between the end surface 310 and the side surface 320 may be a substantially inclined plane, an arc surface, a right-angle surface, a combined surface of an arc surface and an inclined plane, and the like, which is not particularly limited.

Optionally, the first line 1311 may be a straight line segment or an arc line segment, and an included angle formed by two adjacent sub-extrusion surfaces 131 may be a right angle and/or a rounded angle, which may be selected according to actual requirements, so as to knead the end of the battery cell 300 into different shapes.

In some embodiments, referring to fig. 4 and 5, the two or more sub-pressing surfaces 131 may include a first sub-pressing surface 1312 and a second sub-pressing surface 1313, the first line 1311 corresponding to the first sub-pressing surface 1312 is a straight line, the first sub-pressing surface 1312 is connected to the first kneading plane 110, and the first sub-pressing surface 1312 is disposed at an angle with respect to the first kneading plane 110. The first line 1311 corresponding to the second sub-pressing surface 1313 is a straight line, the second sub-pressing surface 1313 is connected between the first sub-pressing surface 1312 and the second kneading plane 120, and the second sub-pressing surface 1313 forms an included angle with respect to both the first sub-pressing surface 1312 and the second kneading plane 120.

Further, referring to fig. 5, an included angle between the first sub-pressing surface 1312 and the first kneading plane 110 is 90 °; and/or the included angle between the second sub-pressing surface 1313 and the first sub-pressing surface 1312 is 90 degrees; and/or the second subpressure surface 1313 is angled at 90 ° to the second kneading plane 120. Preferably, an included angle between the first sub-extrusion surface 1312 and the first kneading plane 110, an included angle between the second sub-extrusion surface 1313 and the first sub-extrusion surface 1312, and an included angle between the second sub-extrusion surface 1313 and the second kneading plane 120 are both 90 °, so that the end of the battery cell 300 is stepped, and the end structure is more regular and flat, which is beneficial to the subsequent processing of the battery cell 300.

Further, the width of the first sub-pressing surface 1312 may be greater than or equal to 0.2mm and less than or equal to 3mm, so that the step height of the kneaded battery cell 300 ranges from 0.2mm to 3mm, and if the step height is less than 0.2mm, when the end of the battery cell 300 is welded to the current collecting tray, the isolation film may be burned by the high temperature generated by welding; if the step height is greater than 3mm, the energy density loss of the battery cell 300 is severe, which may increase the production cost of the battery.

The width of the second sub-pressing surface 1313 may be greater than or equal to 0.2mm and less than or equal to 2mm, so that the radius of the end surface 310 of the kneaded battery cell 300 is smaller than the radius of the main body of the battery cell 300 by 0.2mm to 2mm, and since the end surface 310 of the battery cell 300 needs to be welded with the current collecting tray, if the radius of the end surface 310 is too small, the welding area is small, thereby deteriorating the electrical performance of the battery cell 300.

In other embodiments, the first line 1311 corresponding to each sub-pressing surface 131 may be one of a straight line and a curved line. Referring to fig. 6 and 7, the first line 1311 corresponding to the sub-pressing surface 131 is a straight line, and referring to fig. 8 and 9, the end of the battery cell 300 can be flattened into an inverted-right-angle structure; referring to fig. 10 and 11, the first line 1311 corresponding to the sub-pressing surface 131 is an arc line, referring to fig. 12 and 13, the end of the battery cell 300 can be flattened into a rounded structure, and both the two schemes can make the flattening head 100 completely fit the end of the battery cell 300, so as to ensure the flatness and compactness of the end surface 310 and the side surface 320 of the battery cell 300.

It is understood that the projection of the pressing surface 130 onto the second plane b may include two first straight lines, the two first straight lines are respectively located on two opposite sides of the first axis a, the pressing surface 130 and the first kneading plane 110 and the pressing surface 130 and the second kneading plane 120 are both disposed at an included angle, and the second plane b is parallel to the first axis a; or, the projection of the pressing surface 130 in the second plane b includes two first arc lines, the two first arc lines are respectively located at two opposite sides of the first axis a, the pressing surface 130 is respectively connected with the first kneading plane 110 and the second kneading plane 120 in a smooth transition manner, and the second plane b is parallel to the first axis a.

The projection of the extrusion surface 130 in the second plane b includes two first straight lines or two first arc lines respectively located at two opposite sides of the first axis a, so that the extrusion surface 130 is uniformly arranged around the first axis a, and when the battery cell 300 is rotated and flattened, it is ensured that each part of the end surface 310 and the side surface 320 of the battery cell 300 can be uniformly stressed, and thus the end shape of the battery cell 300 is smoother and smoother.

The first kneading plane 110 is designed such that the first kneading plane 110 is conical in a radial direction gradually decreasing from an end connecting the pressing surface 130 to an end distant from the pressing surface 130 in the first axis a direction. Alternatively, the first kneading plane 110 may have a cylindrical shape, and the present application is not limited thereto.

In a second aspect, referring to fig. 1, an embodiment of the present application provides a cell flattening mechanism 200, where the cell flattening mechanism 200 may include at least one flattening head 100 as described above, a rotating disc 210, a moving adjustment member, and a rotating adjustment member. The kneading head 100 is mounted on a rotating plate 210. The movement adjusting member is connected to the kneading head 100 and is used to drive the kneading head 100 in a first direction, which is perpendicular to the central axis of the rotating disc 210. The number of the kneading blocks 100 may be plural, and the plural kneading blocks 100 may move in plural first directions perpendicular to the central axis of the rotating disk 210 in one-to-one correspondence. The rotation adjustment member is connected to the rotating disc 210 and is used to drive the kneading head 100 to rotate around a second direction, which is parallel to the central axis of the rotating disc 210.

The battery cell flattening mechanism 200 of the embodiment of the application realizes the all-dimensional laminating extrusion on the end part of the battery cell 300, so that the end surface 310 and the side surface 320 of the battery cell 300 become smooth and compact, and the end surface 310 and the side surface 320 of the battery cell 300 can be effectively prevented from generating a sharp corner structure.

In a third aspect, an embodiment of the present application provides a battery cell flattening system, which includes two battery cell flattening mechanisms 200 as described above, where the two battery cell flattening mechanisms 200 are respectively configured to be disposed at two opposite ends of a battery cell 300.

The battery core flattening system can effectively avoid the end face 310 and the side face 320 of the battery core 300 from generating a sharp-angled structure, so that the risk that the sharp-angled structure of the battery core 300 is punctured to protect the rubber is reduced, the short circuit of the battery core 300 is prevented, the goodness of the battery core 300 is improved, and the safety performance of the battery core 300 is enhanced.

The embodiment of the application provides a method for kneading and flattening a battery core, the method for kneading and flattening the battery core uses the above-mentioned mechanism 200 for kneading and flattening the battery core 300, and the method for kneading and flattening the battery core comprises the following steps:

the first kneading plane 110 is attached to the end surface 310 of the battery cell 300, and the adjusting member is rotated to drive the kneading head 100 to rotate around the second direction so as to drive the first kneading plane 110 to rotate, so as to knead the cylindrical end of the battery cell 300;

the movable adjusting member drives the kneading head 100 to move towards the direction close to the central axis of the battery cell 300, so that the second kneading plane 120 is attached to the side surface 320 of the battery cell 300, and the pressing surface 130 is attached to the junction of the end surface 310 and the side surface 320 and is kneaded.

The embodiment of the present application further provides a cylindrical battery cell 300, and the cylindrical battery cell 300 is prepared by using the above battery cell kneading and flattening mechanism 200 and the above battery cell kneading and flattening method. The cylindrical battery cell 300 has an end surface 310, a side surface 320, and a connection surface connected between the end surface 310 and the side surface 320, wherein the connection surface may be at least one of a step (see fig. 14), a rounded corner (see fig. 12 and 13), or a chamfered corner (see fig. 8 and 9).

Preferably, electric core 300 has terminal surface 310, side 320 and connects the step face between terminal surface 310 and side 320, and the step face is including connecting and being first face and the second face that the contained angle set up, and first face connection terminal surface 310 just is the contained angle setting with terminal surface 310, and second face connection side 320 just is the contained angle setting with side 320, and electric core 300's the concrete process of rubbing down is as follows:

the movable adjusting member drives the kneading head 100 to move towards the direction close to the central axis of the battery cell 300, so that the second kneading plane 120 is attached to the side surface 320 of the battery cell 300, the first sub-pressing surface 1312 is attached to the first surface, the second sub-pressing surface 1313 is attached to the second surface and is kneaded, and the end of the battery cell 300 is stepped due to the fact that the included angle between the first sub-pressing surface 1312 and the second sub-pressing surface 1313 is 90 degrees.

The first sub-extrusion surface 1312 and the second sub-extrusion surface 1313 are tightly attached to the interface between the end surface 310 and the side surface 320 of the battery cell 300, so that the end of the battery cell 300 does not form a sharp-angled structure.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present application, it is to be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the above terms may be understood by those skilled in the art according to specific situations.

The above description is only a preferred embodiment of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A kneading block characterized in that the outer peripheral surface of the kneading block comprises:

the second kneading plane is arranged around the first axis and used for being attached to the side face of the battery cell, the projection of the second kneading plane in the first plane is positioned on the periphery of the projection of the first kneading plane in the first plane and is arranged at intervals, and the first plane is perpendicular to the first axis; and

2. The flat head of claim 1, wherein the projection of each sub-pressing surface in the second plane comprises two first lines, the two first lines are respectively located on two opposite sides of the first axis, the extending directions of the first lines corresponding to two adjacent sub-pressing surfaces are different, and the second plane is parallel to the first axis.

3. The flat head of claim 2 wherein two or more of the sub-expression surfaces comprise:

the first line corresponding to the first sub-squeezing surface is a straight line, the first sub-squeezing surface is connected to the first kneading plane, and an included angle is formed between the first sub-squeezing surface and the first kneading plane; and

the first lines corresponding to the second sub-squeezing surfaces are straight lines, the second sub-squeezing surfaces are connected between the first sub-squeezing surfaces and the second kneading plane, and included angles are formed between the second sub-squeezing surfaces and the first sub-squeezing surfaces and between the second sub-squeezing surfaces and the second kneading plane.

4. A kneading block according to claim 3, characterized in that the angle between the first subpressure surface and the first kneading plane is 90 °; and/or the included angle between the second sub-extrusion surface and the first sub-extrusion surface is 90 degrees; and/or the included angle between the second sub-extrusion surface and the second kneading plane is 90 degrees.

5. The kneading block of claim 2, wherein the first line corresponding to each sub-pressing surface is one of a straight line and an arc line.

6. The kneading block of claim 1, wherein the projection of the pressing surface onto the second plane comprises two first straight lines, the two first straight lines are located on opposite sides of the first axis, the pressing surface and the first kneading plane are arranged at an angle, and the pressing surface and the second kneading plane are arranged at an angle, and the second plane is parallel to the first axis; or the like, or a combination thereof,

7. The kneading block of any one of claims 1 to 6, wherein the first kneading plane has a decreasing radial dimension in the direction of the first axis from the end connected to the pressing surface to the end remote from the pressing surface.

8. The utility model provides a mechanism is rubbed to electric core which characterized in that includes:

at least one kneading head according to any one of claims 1 to 7;

the rotary disc is provided with the flat kneading head;

and the rotation adjusting piece is connected with the rotating disc and is used for driving the flat kneading head to rotate around a second direction, and the second direction is parallel to the central axis of the rotating disc.

9. A cell flattening method, wherein the cell flattening mechanism of claim 8 is used to flatten a cell, and the cell flattening method comprises the following steps:

10. A cylindrical electrical core prepared using the core leveler of claim 8, the cylindrical electrical core having an end face, a side face, and a connecting face connected between the end face and the side face, the connecting face being one of a step, a radius, or a chamfer.