CN219203243U - Battery cell winding device - Google Patents

Abstract

The application relates to a battery cell winding device, including: the positioning turntable is provided with at least two first long holes with lengths extending along the X-axis direction and symmetrically distributed along the Y-axis, and at least two second long holes with lengths extending along the Y-axis direction and symmetrically distributed along the X-axis; the support roll shaft comprises at least two first support rolls which are respectively connected in the at least two first long holes in a sliding way, and at least two second support rolls which are respectively connected in the at least two second long holes in a sliding way; the driving mechanism comprises a first module and a second module, wherein the first module is fixed on the positioning turntable, at least two first supporting rollers are close to or far away from each other, and the second module is fixed on the positioning turntable, and drives at least two second supporting rollers to be close to or far away from each other. This application contracts with the direction that is close to each other when two first backing rolls and two second backing rolls behind electric core coiling shaping, takes back the backing roll axle in the electric core again, has improved the unloading efficiency of electric core.

Description

Battery cell winding device

Technical Field

The application relates to the technical field of secondary battery production equipment, in particular to a battery core winding device.

Background

With the rapid development of new energy technology, secondary batteries are increasingly used. The battery cell of the secondary battery is generally formed by winding and combining positive electrode foil paper, negative electrode foil paper, separator paper and the like in a specific layer sequence; the battery cells are divided into round battery cells and square battery cells according to different battery shapes.

At present, a cylindrical round coil is adopted in the industry to perform winding forming on a round battery cell, and an elliptic cylindrical square coil is adopted to perform winding forming on a square battery cell. But circular winding needle or oval winding needle carries out the electricity core and winds, and the blanking needs additional clamping jaw to insert the core of rolling, just can carry out the winding needle unloading, and then leads to unloading inefficiency.

Disclosure of Invention

The embodiment of the application provides a battery core winding device to solve among the correlation technique circular winding needle or oval winding needle and carry out the battery core winding, need other clamping jaw insert the winding core during the unloading, just can carry out the winding needle unloading, lead to the problem that unloading efficiency is low.

The embodiment of the application provides a battery cell winding device, which comprises:

the positioning turntable is provided with at least two first long holes with lengths extending along the X-axis direction and symmetrically distributed along the Y-axis, and at least two second long holes with lengths extending along the Y-axis direction and symmetrically distributed along the X-axis;

the support roll shaft comprises at least two first support rolls which are respectively connected in the at least two first long holes in a sliding mode, and at least two second support rolls which are respectively connected in the at least two second long holes in a sliding mode;

the driving mechanism comprises a first module and a second module, wherein the first module is fixed on the positioning turntable and drives at least two first supporting rollers which are symmetrically distributed along the Y axis to approach or depart from each other, and the second module is fixed on the positioning turntable and drives at least two second supporting rollers which are symmetrically distributed along the X axis to approach or depart from each other.

In some embodiments: the positioning turntable is also provided with at least four third elongated holes positioned between the adjacent first elongated holes and the second elongated holes;

the support roll shaft further comprises at least four third support rolls which are respectively and slidably connected in at least four third long holes;

the driving mechanism further comprises a third module which is fixed on the positioning turntable and drives at least four third supporting rollers which are symmetrical along the center of the positioning turntable to approach or separate from each other.

In some embodiments: the center line of the first long hole in the length direction, the center line of the second long hole in the length direction and the center line of the third long hole in the length direction are intersected at the center point of the positioning turntable.

In some embodiments: the included angle between the central line of the length direction of the third long hole and the Y axis or the X axis is 30 degrees to 60 degrees.

In some embodiments: the first long holes, the second long holes and the third long holes are long waist holes, and the first supporting roller, the second supporting roller and the third supporting roller are cylindrical rod bodies or cylindrical tube bodies.

In some embodiments: the first module, the second module and the third module are all linear modules.

In some embodiments: the axes of the first support roller, the second support roller and the third support roller are parallel to each other, and one end of the first support roller, the second support roller and the third support roller extends in a direction away from the positioning turntable;

the other ends of the first supporting roller, the second supporting roller and the third supporting roller are respectively connected with the first module, the second module and the third module.

In some embodiments: the positioning turntable is of a circular structure, a central hole is formed in the positioning turntable, and a clamping assembly is arranged in the central hole.

In some embodiments: the clamping assembly comprises two clamping plates which are parallel to each other and are arranged at intervals, and a power mechanism for driving the two clamping plates to move in a direction approaching to or separating from each other.

In some embodiments: the first support roller and the second support roller are cylindrical rod bodies or cylindrical tube bodies.

In some embodiments: the positioning turntable is connected with external equipment, can rotate at a set speed under the drive of the external equipment, and can reciprocate in a direction approaching or separating from the battery cell.

The beneficial effects that technical scheme that this application provided brought include:

the embodiment of the application provides a battery cell winding device, because the battery cell winding device is provided with a positioning turntable, the positioning turntable is provided with at least two first long holes with lengths extending along the X-axis direction and symmetrically distributed along the Y-axis, and at least two second long holes with lengths extending along the Y-axis direction and symmetrically distributed along the X-axis; the support roll shaft comprises at least two first support rolls which are respectively connected in the at least two first long holes in a sliding way, and at least two second support rolls which are respectively connected in the at least two second long holes in a sliding way; the driving mechanism comprises a first module and a second module, wherein the first module is fixed on the positioning turntable and drives at least two first supporting rollers which are symmetrically distributed along the Y axis to approach or separate from each other, and the second module is fixed on the positioning turntable and drives at least two second supporting rollers which are symmetrically distributed along the X axis to approach or separate from each other.

Therefore, the first long hole for installing the first supporting roller and the second long hole for installing the second supporting roller are formed in the positioning turntable, and the center line of the length direction of the first long hole and the center line of the length direction of the second long hole are mutually perpendicular. At least two first support rollers symmetrically distributed along the Y axis move in directions of approaching or separating from each other in at least two first long holes respectively, and at least two second support rollers symmetrically distributed along the X axis move in directions of approaching or separating from each other in at least two second long holes respectively. The battery cell is wound and supported by the at least two first supporting rollers and the at least two second supporting rollers, the at least two first supporting rollers and the at least two second supporting rollers shrink in the directions close to each other after the battery cell is wound and molded, the battery cell is self-supporting, and the supporting roller shaft is pulled out from the battery cell, so that automatic blanking of the battery cell can be realized, and the blanking efficiency of the battery cell is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a perspective view of a first view of an embodiment of the present application;

FIG. 2 is a perspective view of a second view of an embodiment of the present application;

fig. 3 is a schematic structural diagram of a circular winding cell according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of an oval wound cell according to an embodiment of the present disclosure;

fig. 5 is a schematic view illustrating an axially inward shrinkage structure of a backup roller according to an embodiment of the present application.

Reference numerals:

1. a third support roller; 2. a second support roller; 3. a first backup roll; 4. positioning a turntable; 5. a battery cell; 6. a second module; 7. a first module; 8. a third module; 9. and a clamping assembly.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.

The embodiment of the application provides a battery cell winding device, and it can solve among the correlation technique circular winding needle or oval winding needle and carry out the battery cell winding, needs extra clamping jaw to insert the winding core during the unloading, just can carry out the winding needle unloading, leads to the problem that unloading efficiency is low.

Referring to fig. 1 to 3, an embodiment of the present application provides a battery cell winding device, including:

the positioning turntable 4 is provided with at least two first long holes with lengths extending along the X-axis direction and symmetrically distributed along the Y-axis, and at least two second long holes with lengths extending along the Y-axis direction and symmetrically distributed along the X-axis. The positioning turntable 4 is connected with external equipment, the positioning turntable 4 can rotate at a set speed under the drive of the external equipment, and the external equipment also drives the positioning turntable 4 to reciprocate in a direction approaching and separating from the battery cell 5.

The support roller shaft comprises at least two first support rollers 3 which are respectively connected in the at least two first long holes in a sliding way, and at least two second support rollers 2 which are respectively connected in the at least two second long holes in a sliding way. One ends of at least two first support rollers 3 move in the directions approaching or separating from each other in at least two first elongated holes, respectively, and one ends of at least two second support rollers 2 move in the directions approaching or separating from each other in at least two second elongated holes, respectively.

The driving mechanism comprises a first module 7 fixed on the back of the positioning turntable 4 and driving at least two first supporting rollers 3 symmetrically distributed along the Y axis to approach or separate from each other, and a second module 6 fixed on the back of the positioning turntable and driving at least two second supporting rollers 2 symmetrically distributed along the X axis to approach or separate from each other. The first module 7 and the second module 6 respectively drive at least two first supporting rollers 3 symmetrically distributed along the Y axis and at least two second supporting rollers 2 symmetrically distributed along the X axis to move in a direction approaching to or separating from each other so as to realize the winding of the battery cell and the discharging operation of the battery cell. The first module 7 and the second module 6 are both commercially available linear modules.

For ease of understanding, the present embodiment is exemplified by setting the first elongated hole, the first support roller, the second elongated hole, and the second support roller to two, respectively, and in other possible implementations, other numbers of the first elongated hole, the first support roller, the second elongated hole, the second support roller, and the like may also be provided, and the principles thereof are similar to those of the present embodiment and will not be described. Wherein, a first backing roll is arranged in each first elongated hole, and a second backing roll is arranged in each second elongated hole.

The battery core winding device of the embodiment of the application is provided with a first long hole for respectively installing the first supporting roller 3 and a second long hole for installing the second supporting roller 2 on the positioning turntable 4, and the central line of the length direction of the first long hole and the central line of the length direction of the second long hole are mutually perpendicular. The two first support rollers 3 respectively move in the directions of approaching or separating from each other in the two first elongated holes, and the two second support rollers 2 respectively move in the directions of approaching or separating from each other in the two second elongated holes.

The two first support rollers 3 and the two second support rollers 2 are used for jointly winding and supporting the battery cell, and the battery cell 5 is wound when the two first support rollers 3 are far away from each other and/or the two second support rollers 2 are far away from each other. When the battery cell 5 is rolled and formed, the two first supporting rollers 3 shrink in the direction approaching to each other and/or the two second supporting rollers 2 shrink in the direction approaching to each other, the battery cell 5 is self-supporting, and the supporting roller shafts can be pulled out from the battery cell 5 under the driving of external equipment, so that the automatic blanking of the battery cell 5 is realized, and the blanking efficiency of the battery cell 5 is improved.

In some alternative embodiments: referring to fig. 1 to 5, an embodiment of the present application provides a battery cell winding device, where a positioning turntable of the battery cell winding device is further provided with at least four third elongated holes located between adjacent first elongated holes and second elongated holes. The support roller shaft further comprises at least four third support rollers 1 slidably connected in at least four third elongated holes, respectively. The driving mechanism further comprises a third module 8 which is fixed on the positioning turntable 4 and drives at least four third supporting rollers 1 which are symmetrical along the center of the positioning turntable to approach or separate from each other. The third module 8 is a commercially available linear module.

For ease of understanding, the embodiment of the present application is illustrated by taking four third elongated holes and third support rollers as examples, and in other possible embodiments, other numbers of third elongated holes and third support rollers may be provided. For example, 6, 8, 10, 12, etc., the principles of which are similar to those of the embodiments of the present application and will not be described. Wherein a third support roller is disposed in each third elongated hole.

The center line of the first long hole in the length direction, the center line of the second long hole in the length direction and the center line of the third long hole in the length direction intersect at the center point of the positioning turntable 4. And the included angle between the central line of the length direction of the third long hole and the Y axis or the X axis is 30 degrees to 60 degrees, and the included angle between the central line of the length direction of the third long hole and the Y axis or the X axis is more preferably 45 degrees. The first, second and third elongated holes are all long waist holes, and the length of the first elongated hole is greater than that of the second and third elongated holes. By designing the first, second and third elongated holes as long waist holes, limiting of the first, second and third support rollers can be achieved.

The distance between the second long hole and the center point of the positioning turntable 4 is the same as the distance between the third long hole and the center point of the positioning turntable 4, the distance between the first long hole and the center point of the positioning turntable 4 is B, and B is more than A, so that when the second supporting roller 2 and the third supporting roller 1 are far away from the center point of the positioning turntable 4, and the first supporting roller 3 is near to the center point of the positioning turntable 4, the first supporting roller 3, the second supporting roller 2 and the third supporting roller 1 enclose a perfect circle to roll into a perfect circle of electric cores 5. In one possible embodiment, when the second support roller 2 and the third support roller 1 are farthest from the center point of the positioning turntable 4 and the first support roller 3 is closest to the center point of the positioning turntable 4, the first support roller 3, the second support roller 2, and the third support roller 1 enclose a perfect circle to roll into a perfect circle cell 5.

When the third support roller 1 and the first support roller 3 are far away from the center point of the positioning turntable 4, and the second support roller 2 is near to the center point of the positioning turntable 4, the first support roller 3, the second support roller 2 and the third support roller 1 enclose an ellipse for rolling the elliptical cell 5. In a possible embodiment, when the third support roller 1 and the first support roller 3 are farthest from the center point of the positioning turntable 4 and the second support roller 2 is closest to the center point of the positioning turntable 4, the first support roller 3, the second support roller 2 and the third support roller 1 enclose an ellipse for rolling the oval cell 5.

When the third support roller 1 is located on the connecting line between the adjacent first support roller 3 and second support roller 2, the first support roller 3, second support roller 2 and third support roller 1 enclose a diamond shape for coiling into diamond-shaped battery cells 5.

When the third support roller 1, the second support roller 2 and the first support roller 3 are nearest to the center point of the positioning turntable 4, the rolled battery cell 5 is conveniently and rapidly removed from the first support roller 3, the second support roller 2 and the third support roller 1.

When the battery cell 5 is wound, the first support roller 3, the second support roller 2, and the third support roller 1 may not be located at the position closest to the center point of the positioning turntable with respect to the elongated hole at the same time.

The axes of the first support roller 3, the second support roller 2 and the third support roller 1 are parallel to each other and one end extends away from the positioning turntable 4. The two first modules 7 are used for respectively driving the two first supporting rollers 3 which are symmetrically distributed along the Y axis to move in the approaching or separating direction, the two second modules 6 are used for respectively driving the two second supporting rollers 2 which are symmetrically distributed along the X axis to move in the approaching or separating direction, and the four third modules 8 are used for respectively driving the four third supporting rollers 1 which are symmetrically distributed along the center of the positioning turntable to move in the approaching or separating direction.

Referring to fig. 3, when the cell winding device winds a right circular cell, two first modules 7 are used for respectively driving the two first support rollers 3 symmetrically distributed along the Y axis to move in the direction of approaching each other, two second modules 6 are used for respectively driving the two second support rollers 2 symmetrically distributed along the X axis to move in the direction of separating each other, and four third modules 8 are used for respectively driving the four third support rollers 1 symmetrically distributed along the center of the positioning turntable to move in the direction of separating each other. So that the two first support rollers 3, the two second support rollers 2 and the four third support rollers 1 enclose a positive circle, and then the positive plate, the negative plate and the diaphragm are wound to form a positive circular battery cell.

Referring to fig. 4, when the cell winding device is an oval cell 5, two first modules 7 are used for respectively driving at least two first support rollers 3 symmetrically distributed along the Y axis to move away from each other, two second modules 6 are used for respectively driving two second support rollers 2 symmetrically distributed along the X axis to move toward each other, and four third modules 8 are used for respectively driving four third support rollers 1 symmetrically distributed along the center of the positioning turntable to move away from each other. So that the two first support rollers 3, the two second support rollers 2 and the four third support rollers 1 enclose an ellipse, and then the positive plate, the negative plate and the diaphragm are wound to form an ellipse cell 5.

Referring to fig. 5, when the wound battery core 5 needs to be removed, two first modules 7 are used for respectively driving the two first support rollers 3 symmetrically distributed along the Y axis to move in the direction of approaching each other, two second modules 6 are used for respectively driving the two second support rollers 2 symmetrically distributed along the X axis to move in the direction of approaching each other, and four third modules 8 are used for respectively driving the four third support rollers 1 symmetrically distributed along the center of the positioning turntable to move in the direction of approaching each other. So that the diameter of the circle or ellipse enclosed by the two first support rollers 3, the two second support rollers 2 and the four third support rollers 1 is reduced, and the discharging operation of the battery cell 5 is facilitated.

It should be noted that, the support roller can move and stop at any position in the corresponding elongated hole under the driving of the corresponding module, so that in the actual use and design process, the size of the elongated hole and the position of the support roller can be adjusted according to the actual requirement.

In some alternative embodiments: referring to fig. 1 to 5, an embodiment of the present application provides a battery cell winding device, where a positioning turntable 4 of the battery cell winding device has a circular structure, a central hole is formed on the positioning turntable 4, and a clamping assembly 9 is disposed in the central hole. The clamping assembly 9 comprises two clamping plates which are parallel to each other and are arranged at intervals, and a power mechanism for driving the two clamping plates to move in a direction approaching or separating from each other. The clamping assembly 9 is used for automatically clamping the positive electrode sheet, the negative electrode sheet and the diaphragm of the battery cell 5 before the battery cell 5 is wound, so that automatic winding is facilitated.

The first support roller 3, the second support roller 2 and the third support roller 1 are all cylindrical bars or cylindrical tubes. The number of the first support rollers 3 is not limited to four, and the number of the first support rollers 3 may be increased when the inner diameter of the battery cell 5 is increased. The utility model discloses a can set up the back-up roll axle of different quantity and diameter according to the internal diameter of required electric core 5, through the deformation of back-up roll axle, realize electric core coiling mechanism's deformation to through the quantity that reduces back-up roll axle, reduce electric core coiling mechanism's diameter, thereby realize electric core coiling mechanism's girth and the change of shape.

Principle of operation

The embodiment of the application provides a battery cell winding device, because the battery cell winding device is provided with a positioning turntable 4, the positioning turntable 4 is provided with at least two first long holes with lengths extending along the X-axis direction and symmetrically distributed along the Y-axis, and at least two second long holes with lengths extending along the Y-axis direction and symmetrically distributed along the X-axis; the support roll shaft comprises at least two first support rolls 3 which are respectively connected in the at least two first long holes in a sliding way, and at least two second support rolls 2 which are respectively connected in the at least two second long holes in a sliding way; the driving mechanism comprises a first module 7 which is fixed on the positioning turntable 4 and drives at least two first supporting rollers 3 symmetrically distributed along the Y axis to approach or separate from each other, and a second module 6 which is fixed on the positioning turntable 4 and drives at least two second supporting rollers 2 symmetrically distributed along the X axis to approach or separate from each other.

Therefore, the cell winding device of the application is provided with the first long hole for respectively installing the first supporting roller 3 and the second long hole for installing the second supporting roller 2 on the positioning turntable 4, and the central line of the length direction of the first long hole and the central line of the length direction of the second long hole are mutually perpendicular. At least two first support rollers 3 symmetrically distributed along the Y-axis move in directions approaching or separating from each other in at least two first elongated holes, respectively, and at least two second support rollers 2 symmetrically distributed along the X-axis move in directions approaching or separating from each other in at least two second elongated holes, respectively. The battery cell 5 is wound and supported by the at least two first supporting rollers 3 and the at least two second supporting rollers 2 together, when the battery cell 5 is wound and molded, the at least two first supporting rollers 3 and the at least two second supporting rollers 2 shrink in the directions close to each other, the battery cell 5 is self-supporting, and the supporting roller shafts are pulled out from the battery cell 5, so that automatic blanking of the battery cell 5 can be realized, and the blanking efficiency of the battery cell 5 is improved.

In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

It should be noted that in this application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A cell winding device, comprising:

the positioning turntable (4) is provided with at least two first long holes with lengths extending along the X-axis direction and symmetrically distributed along the Y-axis, and at least two second long holes with lengths extending along the Y-axis direction and symmetrically distributed along the X-axis;

the support roll shaft comprises at least two first support rolls (3) which are respectively connected in the at least two first long holes in a sliding way, and at least two second support rolls (2) which are respectively connected in the at least two second long holes in a sliding way;

the driving mechanism comprises a first module (7) which is fixed on the positioning turntable (4) and drives at least two first supporting rollers (3) symmetrically distributed along the Y axis to approach or separate from each other, and a second module (6) which is fixed on the positioning turntable (4) and drives at least two second supporting rollers (2) symmetrically distributed along the X axis to approach or separate from each other.

2. A cell winding device according to claim 1, wherein:

the positioning turntable (4) is also provided with at least four third long holes positioned between the adjacent first long holes and the second long holes;

the support roll shaft also comprises at least four third support rolls (1) which are respectively and slidably connected in at least four third long holes;

the driving mechanism also comprises a third module (8) which is fixed on the positioning turntable (4) and drives at least four third supporting rollers (1) which are symmetrical along the center of the positioning turntable to approach or separate from each other.

3. A cell winding device according to claim 2, wherein:

the center line of the first long hole in the length direction, the center line of the second long hole in the length direction and the center line of the third long hole in the length direction are intersected at the center point of the positioning turntable (4).

4. A cell winding device according to claim 2 or 3, wherein:

the included angle between the central line of the length direction of the third long hole and the Y axis or the X axis is 30 degrees to 60 degrees.

5. A cell winding device according to claim 2, wherein:

the first long holes, the second long holes and the third long holes are long waist holes, and the first supporting roller (3), the second supporting roller (2) and the third supporting roller (1) are cylindrical rod bodies or cylindrical tube bodies.

6. A cell winding device according to claim 2, wherein:

the first module (7), the second module (6) and the third module (8) are all linear modules.

7. A cell winding device according to claim 2, wherein:

the axes of the first supporting roller (3), the second supporting roller (2) and the third supporting roller (1) are parallel to each other, and one end of the first supporting roller extends in a direction away from the positioning turntable (4);

the other ends of the first supporting roller (3), the second supporting roller (2) and the third supporting roller (1) are respectively connected with a first module (7), a second module (6) and a third module (8).

8. A cell winding device according to claim 1, wherein:

the positioning turntable (4) is of a circular structure, a central hole is formed in the positioning turntable (4), and a clamping assembly (9) is arranged in the central hole.

9. A cell winding device according to claim 8, wherein:

the clamping assembly (9) comprises two clamping plates which are parallel to each other and are arranged at intervals, and a power mechanism for driving the two clamping plates to move in a direction approaching to or separating from each other.

10. A cell winding device according to claim 1, wherein:

the positioning rotary table (4) is connected with external equipment, can rotate at a set speed under the drive of the external equipment, and can reciprocate in a direction approaching or separating from the battery cell (5).

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