CN219610523U

CN219610523U - Lamination mechanism

Info

Publication number: CN219610523U
Application number: CN202320939002.1U
Authority: CN
Inventors: 沈志鹏; 陈凯; 冯玉川; 李峥; 何泓材
Original assignee: Suzhou Qingtao New Energy S&T Co Ltd
Current assignee: Suzhou Qingtao New Energy S&T Co Ltd
Priority date: 2023-04-24
Filing date: 2023-04-24
Publication date: 2023-08-29
Anticipated expiration: 2033-04-24

Abstract

The utility model discloses a lamination mechanism, and relates to the technical field of power battery production. The lamination mechanism comprises a lamination table and a film supply assembly, wherein both sides of the lamination table in a first direction are provided with compression assemblies, each compression assembly comprises a compression piece, each compression piece is strip-shaped, and each compression piece extends along the first direction; the membrane supply assembly is used for providing a membrane for the lamination table, the lamination table is in reciprocating movement along a first direction below the membrane supply assembly, the pressing piece can press or loosen one end of a pole piece on the lamination table, which is located in a second direction, and the second direction is perpendicular to the first direction. The lamination mechanism can ensure the flatness of the diaphragm when the pole piece is pressed, and prevent the diaphragm from being wrinkled.

Description

Lamination mechanism

Technical Field

The utility model relates to the technical field of power battery production, in particular to a lamination mechanism.

Background

Lamination process of lithium battery is an important component in lithium battery production, and lamination process is an important factor affecting battery production quality, and has great influence on battery quality and service life. In the lamination, it is necessary to alternately stack the positive electrode sheet and the negative electrode sheet with a separator interposed therebetween.

The prior Z-shaped lamination adopts the technical scheme of four-corner pressing claws of the battery cell. In the lamination process, the two pressing claws on one side of the battery core are used for fixing the diaphragm, after the pole piece is sent, the other two opposite pressing claws are used for pressing the pole piece, and the two previous pressing claws are released. The membrane has tension in the lamination process, and the two pressing claws can cause membrane fold due to uneven tension in the process of fixing the membrane, so that the electrical performance of the battery cell is affected.

Disclosure of Invention

The utility model aims to provide a lamination mechanism which can ensure the flatness of a diaphragm and prevent the diaphragm from wrinkling when a pole piece is pressed.

To achieve the purpose, the utility model adopts the following technical scheme:

a lamination mechanism comprising:

the lamination table is provided with compression assemblies at two sides of the first direction, the compression assemblies comprise compression pieces, the compression pieces are strip-shaped, and the compression pieces extend along the first direction;

the membrane supplying assembly is used for providing a membrane for the lamination table, the lamination table moves back and forth along a first direction below the membrane supplying assembly, the pressing piece can press or loosen one end, located in a second direction, of the pole piece on the lamination table, and the second direction is perpendicular to the first direction.

In some embodiments, the lamination mechanism further comprises an air blowing assembly, an air hole is formed in the bottom surface of the pressing piece, and the air blowing assembly is communicated with the air hole.

In some embodiments, the lamination mechanism further includes a suction assembly in communication with the air vent.

In some embodiments, the pressing member is provided with a plurality of the air holes at intervals, and the plurality of the air holes are communicated with each other.

In some embodiments, the compressing assembly further comprises a bracket and an air pipe, the bracket is arranged above the compressing member at intervals, the air pipe and the compressing member are fixedly connected with the bracket, one end of the air pipe is communicated with the air hole, and the other end of the air pipe is communicated with the air blowing assembly.

In some embodiments, the outer side surface of the pressing member is provided with a connection hole, the connection hole is communicated with the air hole, and the connection hole is used for connecting the air blowing assembly.

In some embodiments, the compression assembly further comprises:

the first driving piece can drive the compressing piece to lift;

and the second driving piece can drive the first driving piece to move along a second direction.

In some embodiments, the compression assembly further comprises a flexible pad disposed on a bottom surface of the compression member.

In some embodiments, the flexible cushion is provided with a relief portion that vents the air hole.

In some embodiments, the dimension of the compression member in the first direction is greater than or equal to the dimension of the pole piece in the first direction.

The utility model has the beneficial effects that:

the utility model provides a lamination mechanism. In this lamination mechanism, the compressing element that compresses tightly the subassembly is the strip, and extends along first direction, and when the compressing element compresses tightly the one end that the pole piece is located the second direction, pole piece and diaphragm evenly atress have effectively avoided leading to the problem of diaphragm fold because tension is uneven.

The lamination mechanism can ensure the flatness of the diaphragm when the pole piece is pressed, and prevent the diaphragm from being wrinkled.

Drawings

FIG. 1 is a schematic view of a lamination mechanism according to a first embodiment of the present utility model;

FIG. 2 is an exploded view of a compression assembly according to one embodiment of the present utility model;

fig. 3 is a schematic structural view of a lamination mechanism according to a second embodiment of the present utility model;

FIG. 4 is an exploded view of a compression assembly according to a second embodiment of the present utility model;

FIG. 5 is a schematic view of a pressing assembly according to a third embodiment of the present utility model;

fig. 6 is a schematic structural diagram of a compressing assembly according to a fourth embodiment of the present utility model.

In the figure:

1. a lamination stage; 2. a compression assembly;

21. a pressing member; 22. a flexible pad; 23. a bracket; 24. an air pipe;

211. air holes; 212. a connection hole; 221. and an avoidance part.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly, and may be, for example, either fixed or removable; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Unless expressly stated or limited otherwise, a first feature being "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.

Example 1

The present embodiment provides a lamination mechanism, as shown in fig. 1, which includes a lamination stage 1 and a film supply assembly. Lamination bench 1 all is provided with and compresses tightly subassembly 2 in the both sides of first direction (X direction in the figure), compresses tightly subassembly 2 and includes compressing tightly piece 21, compresses tightly piece 21 and be the strip, compresses tightly piece 21 and extends along first direction, supplies the membrane module to be used for providing the diaphragm to lamination bench 1, and lamination bench 1 is in supplying the below of membrane module to reciprocate along first direction, compresses tightly piece 21 and can compress tightly or loosen the pole piece that the lamination bench 1 is located the one end of second direction (Y direction in the figure), and the second direction is perpendicular to first direction.

When lamination is carried out, the lamination table 1 moves along the first direction, a pole piece is placed on the diaphragm on the lamination table 1, then the lamination table 1 moves along the opposite direction of the first direction, the diaphragm covers the pole piece, at the moment, the pole piece is placed on the diaphragm again, and the lamination table 1 continues to move along the first direction. Lamination is completed with the reciprocating movement of the lamination table 1 in the first direction.

In this lamination mechanism, compress tightly the piece 21 of subassembly 2 and be the strip, and extend along first direction, when the piece 21 compresses tightly the one end that the pole piece is located the second direction, pole piece and diaphragm evenly atress have effectively avoided leading to the problem of diaphragm fold because tension is uneven.

Wherein, the membrane supply assembly is the prior art, as long as can the diaphragm of continuous feeding accomplish Z lamination.

In order to improve the production efficiency during the lamination production process, the movement speed of the pressing member 21 is high, so that the pressing member 21 can be adhered to the pole piece or the diaphragm. As shown in fig. 2, in order to solve the above problem, the lamination mechanism further includes an air blowing assembly, and an air hole 211 is formed in the bottom surface of the pressing member 21, and the air blowing assembly is communicated with the air hole 211. When the pressing piece 21 needs to loosen the pole piece, the air blowing assembly can blow air through the air holes 211, so that the pole piece can be quickly separated from the pressing piece 21, the pole piece is prevented from being driven when the pressing piece 21 moves quickly, the stability of the pole piece position is ensured, and the change of the relative position between the pole piece and the diaphragm is prevented.

Preferably, the pressing member 21 is provided with a plurality of air holes 211 at intervals, and the plurality of air holes 211 communicate with each other. When the blowing assembly blows, the air holes 211 jet air at the same time, so that the pole piece is separated from the compressing piece 21 at the same time, the other side is prevented from being driven by the compressing piece 21 when the pole piece is separated from the compressing piece 21 at one side, and the accuracy of the relative position between the pole piece and the diaphragm is further improved.

As shown in fig. 1, in this embodiment, the compressing assembly 2 further includes a support 23 and an air tube 24, the support 23 is disposed above the compressing member 21 at intervals, the air tube 24 and the compressing member 21 are fixedly connected to the support 23, one end of the air tube 24 is communicated with the air hole 211, and the other end of the air tube 24 is communicated with the air blowing assembly. The support 23 can fix the air pipe 24 and the compressing piece 21, and prevents the air pipe 24 from being unfixed in the bending direction and interfering with the diaphragm in the moving process of the compressing piece 21, so that the lamination yield is improved.

Preferably, the lamination mechanism further includes a getter assembly in communication with the air vent 211. When the compressing piece 21 compresses the pole piece, the air suction component can generate negative pressure through the air hole 211, so that the compressing piece 21 generates adsorption force to the pole piece, the pole piece and the diaphragm are prevented from moving relatively in the moving process, and the accuracy of the relative position between the pole piece and the diaphragm is improved.

In this embodiment, the power sources of the air suction assembly and the air blowing assembly may be air pumps, or other devices capable of driving air to flow.

In the prior art, the Z-shaped lamination mostly adopts the technical scheme of four-corner pressing claws, two pressing claws on one side of an electric core are used for fixing a diaphragm, after a pole piece is sent up, the other two opposite pressing claws are used for pressing the pole piece, and the two previous pressing claws are loosened. Such actions are repeated continuously to achieve the cell stack. However, the membrane has tension in the lamination process, the fixing area of the pressing claws is smaller, and the two pressing claws can cause membrane wrinkles due to uneven tension in the process of fixing the membrane, so that the electrical performance of the battery cell is affected.

To solve the above problem, the dimension of the pressing member 21 in the first direction is greater than or equal to the dimension of the pole piece in the first direction. The compressing piece 21 can cover one end edge of the pole piece in the second direction, so that the position of the pole piece compressed by the compressing piece 21 is guaranteed to be uniform in tension and can not be wrinkled, the possibility that the electrical performance of the battery cell is affected due to the occurrence of the wrinkling is reduced, and the yield of the battery cell lamination process is improved. Moreover, the pressing piece 21 can press the pole piece in a large area, thereby reducing the local pressing force on the pole piece and preventing the pole piece from being damaged.

Preferably, the pressing assembly 2 further comprises a first driving member and a second driving member, wherein the first driving member can drive the pressing member 21 to lift, and the second driving member can drive the first driving member to move along the second direction. The first driving member can drive the compressing member 21 to lift, and the second driving member can enable the compressing member 21 to be close to or far away from the pole piece by driving the first driving member to move.

That is, when the pole piece needs to be compressed, the second driving member drives the first driving member to move so that the compressing member 21 is close to the pole piece, and when the compressing member 21 moves above the pole piece, the first driving member drives the compressing member 21 to move downwards so as to compress the pole piece. When the pole piece needs to be loosened and the uppermost pole piece is compressed, the second driving piece drives the first driving piece to move so that the compressing piece 21 is far away from the pole piece, then the first driving piece drives the compressing piece 21 to ascend, the second driving piece drives the first driving piece so that the compressing piece 21 moves to the upper part of the pole piece, and the first driving piece drives the compressing piece 21 to move downwards to compress the pole piece.

By matching the first driving piece and the second driving piece, the pressing piece 21 can realize automatic operation of pressing and loosening the pole piece. In this embodiment, the first driving member and the second driving member are both cylinders. It should be understood that the first driving member and the second driving member may be other driving structures, so long as the compressing member 21 can be driven to move along a straight line, which is not described herein.

As shown in fig. 1, the compressing assembly 2 further includes a flexible pad 22, and the flexible pad 22 is disposed on the bottom surface of the compressing member 21. The compressing piece 21 compresses the pole piece through the flexible pad 22, so that the damage of the pole piece or the scratch of the pole piece by the compressing piece 21 can be avoided. In this embodiment, the flexible pad 22 may be formed of a flexible or elastic material such as rubber, silicone, sponge, or the like.

Preferably, the flexible pad 22 is provided with a relief portion 221 that vents the air holes 211. In order to reduce the local pressure of the flexible pad 22 on the polar plate, and also to prevent the membrane from wrinkling, the range that the flexible pad 22 needs to be arranged is larger, and the avoidance part 221 can avoid the air hole 211, so that the situation that the flexible pad 22 blocks the air hole 211 to cause that the polar plate cannot be subjected to air suction or air blowing operation is prevented. In the present embodiment, the escape portion 221 is an opening.

Example two

The present embodiment is an improvement in the structure of the pressing assembly 2 on the basis of the first embodiment.

As shown in fig. 3 and 4, in the present embodiment, the outer side surface of the compressing member 21 is provided with a connection hole 212, the connection hole 212 is communicated with the air hole 211, and the connection hole 212 is used for connecting the air blowing assembly. The lateral surface of the pressing piece 21 refers to one side of the pressing piece 21 deviating from the pole piece, and when the pressing piece 21 moves, the lateral surface of the pressing piece 21 always does not enter the vertical projection range of the pole piece, that is, the air blowing assembly is communicated with the air hole 211 through the connecting hole 212 positioned on the lateral surface, so that the air blowing operation on the pole piece can be realized, and interference between a pipeline and a diaphragm can be avoided. Moreover, by providing the connecting hole 212 on the outer side surface, the structure of the bracket 23 is canceled, the size of the pressing assembly 2 in the vertical direction can be reduced, and when the lamination table 1 moves to enable the diaphragm to cover the pole piece, the diaphragm can be closer to the pole piece, and the fitting degree is improved.

In the present embodiment, the connection hole 212 is also connected to a suction assembly so that the air holes 211 can perform operations of blowing and suction, respectively.

Example III

The present embodiment is an improvement in the structure of the flexible pad 22 on the basis of the first or second embodiment.

As shown in fig. 5, in the present embodiment, the flexible pad 22 is entirely located at one side of the air hole 211, and the flexible pad 22 does not cover the air hole 211, so that the flexible pad 22 avoids the air hole 211, that is, the flexible pad 22 does not need to be provided with an opening, and the position of the bottom surface of the pressing member 21 where the flexible pad 22 is not provided corresponds to the avoiding portion of the flexible pad 22.

Example IV

As shown in fig. 6, in the present embodiment, a plurality of flexible pads 22 are provided, a plurality of flexible pads 22 are disposed at intervals on the bottom surface of the pressing member 21, and air holes 211 of the pressing member 21 are disposed at intervals of the flexible pads 22. The flexible pads 22 arranged at intervals do not shade the air holes 211, and the intervals between the flexible pads 22 are equivalent to the avoiding portions of the flexible pads 22.

The foregoing is merely exemplary of the present utility model, and those skilled in the art should not be considered as limiting the utility model, since modifications may be made in the specific embodiments and application scope of the utility model in light of the teachings of the present utility model.

Claims

1. A lamination mechanism, comprising:

lamination table (1), lamination table (1) is provided with in the both sides of first direction and compresses tightly subassembly (2), compress tightly subassembly (2) and include compress tightly piece (21), compress tightly piece (21) and take the form of strip, compress tightly piece (21) and extend along first direction;

the membrane supplying assembly is used for supplying a membrane to the lamination table (1), the lamination table (1) moves back and forth along a first direction under the membrane supplying assembly, the pressing piece (21) can press or loosen one end, located in a second direction, of a pole piece on the lamination table (1), and the second direction is perpendicular to the first direction.

2. Lamination mechanism according to claim 1, characterized in that it further comprises an air blowing assembly, the bottom surface of the compression element (21) being provided with air holes (211), the air blowing assembly being in communication with the air holes (211).

3. The lamination mechanism according to claim 2, further comprising a getter assembly in communication with the air vent (211).

4. Lamination mechanism according to claim 2, characterized in that the hold-down element (21) is provided with a plurality of said air holes (211) at intervals, and in that a plurality of said air holes (211) are in communication with each other.

5. Lamination mechanism according to claim 2, characterized in that the compression assembly (2) further comprises a support (23) and an air pipe (24), the support (23) is arranged above the compression member (21) at intervals, the air pipe (24) and the compression member (21) are fixedly connected with the support (23), one end of the air pipe (24) is communicated with the air hole (211), and the other end of the air pipe (24) is communicated with the air blowing assembly.

6. Lamination mechanism according to claim 2, characterized in that the outer side of the compression element (21) is provided with a connection hole (212), the connection hole (212) being in communication with the air hole (211), the connection hole (212) being for connecting the blowing assembly.

7. Lamination mechanism according to claim 2, characterized in that the compression assembly (2) further comprises:

the first driving piece can drive the pressing piece (21) to lift;

8. Lamination mechanism according to claim 2, characterized in that the compression assembly (2) further comprises a flexible pad (22), the flexible pad (22) being arranged on the bottom surface of the compression member (21).

9. The lamination mechanism according to claim 8, characterized in that the flexible pad (22) is provided with a relief (221) that relieves the air hole (211).

10. Lamination mechanism according to any one of claims 1 to 9, characterized in that the dimension of the hold-down (21) in the first direction is greater than or equal to the dimension of the pole piece in the first direction.