CN217158284U

CN217158284U - Winding device of battery pole piece

Info

Publication number: CN217158284U
Application number: CN202220445790.4U
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-03-03
Filing date: 2022-03-03
Publication date: 2022-08-09
Anticipated expiration: 2032-03-03

Abstract

The utility model discloses a winding device of battery sheet, including the winding axle, still include: the first pressing roll group is arranged on the side part of the winding shaft, and is provided with a first bending part which enables a plurality of lugs on the battery positive plate to be bent along the same direction when the battery positive plate passes through the first pressing roll group; and the second pressing roller group is arranged at the side part of the winding shaft, and is provided with a second bending part which enables the plurality of lugs on the battery negative pole piece to be bent along the same direction when the battery negative pole piece passes through the second pressing roller group. The utility model discloses the utmost point ear that enables on the battery pole piece is bent in an orderly manner.

Description

Winding device of battery pole piece

Technical Field

The utility model relates to a battery manufacturing field, concretely relates to take-up device of battery sheet.

Background

The lithium battery pole piece comprises a positive pole piece and a negative pole piece, wherein the positive pole piece and the negative pole piece are usually coiled on a coiling shaft in a coiling way after being prepared, and more pole pieces can be accommodated in the coiling way. In order to separate the positive electrode sheet and the negative electrode sheet, a separator is provided between the positive electrode sheet and the negative electrode sheet, and therefore, during winding, the winding shaft is driven by a motor to wind the positive electrode sheet, the negative electrode sheet, and the separator located between the positive electrode sheet and the negative electrode sheet together on the winding shaft. The positive and negative electrodes are wound on a winding shaft, and after a predetermined number of winding layers are reached, the winding needle is removed, thereby forming a cell.

Because the positive and negative pole pieces are provided with the pole lugs (the pole lugs refer to metal conductors led out from the positive and negative pole pieces in the battery core), the pole lugs are contact points for charging and discharging of the battery. The traditional battery is only provided with two tabs at the head parts of the positive and negative pole pieces, and along with the development of the technology, the novel cylindrical battery realizes the full tab, namely, a plurality of tabs are equidistantly arranged along the side edges of the positive pole piece and the negative pole piece, so that the distance between the tabs is shortened, and the efficiency of the battery is improved. In the manufacturing process of the battery cell with the full tabs, the tabs are required to be regularly inverted to the axial end face of the battery cell, a corresponding method for controlling the tabs is not available at present, and it is very difficult to control the shapes of the tabs to be consistent in the high-speed winding process, so that how to regularly invert the tabs to the axial end face of the battery cell and control the corresponding shapes are difficult.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery pole piece's coiling mechanism, the utility model discloses the utmost point ear that enables on the battery pole piece is bent in an orderly manner.

The winding device of battery pole piece includes the winding shaft, still includes:

the first pressing roll group is arranged on the side part of the winding shaft, and is provided with a first bending part which enables a plurality of lugs on the battery positive plate to be bent along the same direction when the battery positive plate passes through the first pressing roll group;

and the second pressing roller group is arranged at the side part of the winding shaft, and is provided with a second bending part which enables the plurality of lugs on the battery negative pole piece to be bent along the same direction when the battery negative pole piece passes through the second pressing roller group.

In the utility model, in the process of winding the battery pole piece into the battery core, the battery positive pole piece passes through the first press roller group, the battery negative pole piece passes through the second press roller group, when the winding shaft generates acting force on the battery positive plate and the battery negative plate to move the battery positive plate and the battery negative plate, when each first tab on the battery positive plate passes through the first bending part, the first tab on the battery positive plate is bent under the pressure action of the first bending part, similarly, when each second tab on the battery negative plate passes through the second bending part, the second tab on the battery negative plate is bent under the pressure action of the second bending part, the bending angle of each tab is consistent, after the battery positive plate and the battery negative plate are wound on the winding shaft, the battery positive plate is positioned at one end of the axial end face of the winding shaft and is uniformly distributed in the circumferential direction, and the battery negative plate is positioned at the other axial end face of the winding shaft and is uniformly distributed in the circumferential direction. After the multilayer positive plate and the multilayer negative plate of the battery are wound and stacked, the lugs are distributed in the above mode and are sequentially stacked along the axial direction, and finally, after the battery core is formed, all the lugs are inverted to the axial end face of the battery core.

The utility model discloses go into before rolling up at battery sheet and bend the processing to utmost point ear, rub flat technology for the back way of electric core and carry out the preliminary treatment to utmost point ear, the utility model discloses a coiling mechanism is to bending of battery sheet not only reliability, yields height to the good advantage of the uniformity of utmost point ear of bending. The utility model discloses specially adapted lithium cell's manufacturing.

Drawings

FIG. 1 is a perspective view of a winding apparatus for a battery pole piece;

FIG. 2 is a cross-sectional view of a winding apparatus for a battery pole piece;

FIG. 3 is a perspective view of the winding assembly of the battery pole piece in another orientation;

FIG. 4 is a matching diagram of a first press roller group and a battery positive plate and a second press roller group and a battery negative plate;

FIG. 5 is a schematic end view of the first roller;

FIG. 6 is a perspective view of the winding assembly of the battery pole piece with a portion of the components hidden;

reference numbers in the drawings:

the battery comprises a battery positive plate A, a first tab A1, a battery negative plate B, a second tab B1, a diaphragm C, an electric core D, a winding shaft 1, a first roller 2, a first tapered rolling part 2a, a second roller 3, a second tapered rolling part 3a, a third roller 4, a third tapered rolling part 4a, a fourth roller 5, a fourth tapered rolling part 5a, a first upper support 6, a first lower support 7, a first driver 8, a first sliding rail 9, a second upper support 10, a second lower support 11, a second driver 12, a second sliding rail 13, a movable guide plate 14, a guide plate body 14a, a shaft sleeve 14B, a third driver 15, a first mounting seat 16, a first curved guide plate 17, a second mounting seat 18, a second curved guide plate 19 and a protruding part 20.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1 to 6, the winding device of the battery pole piece of the present invention includes a winding shaft 1, a first compression roller set and a second compression roller set, wherein the first compression roller set is disposed at a side portion of the winding shaft 1, and the first compression roller set is provided with a first bending portion for bending a plurality of tabs on a battery positive plate a along the same direction when the battery positive plate passes through the first compression roller set; the first tab a1 on the battery positive electrode tab a is bent by the rotating first press roller set. The second press roller group is arranged at the side part of the winding shaft 1, the second press roller group is provided with a second bending part which enables the battery negative pole piece B to bend a plurality of second pole lugs B1 on the battery negative pole piece in the same direction when passing through the second press roller group, and the second pole lug B1 on the battery negative pole piece B is bent by the second press roller group which rotates.

The utility model discloses in, at the in-process of coiling into electric core D with the battery pole piece, the positive plate of battery passes first compression roller set, battery negative plate B passes second compression roller set, produce the effort when coiling axle 1 to positive plate of battery A and battery negative plate B, when making positive plate of battery A and battery negative plate B remove, every first utmost point ear A1 on the positive plate of battery A is when the first portion of bending of process, receive the pressure effect of first portion of bending, make the first utmost point ear A1 on the positive plate of battery A bend, and is same, every second utmost point ear B1 on the negative plate of battery B is when the portion of bending of process second, receive the pressure effect of the second portion of bending, make the second utmost point ear B1 on the negative plate of battery bend. The bending angle of each tab is consistent, after the battery positive plate A and the battery negative plate B are wound on the winding shaft 1, the battery positive plate A is located at one end of the axial end face of the winding shaft 1 and is uniformly distributed in the circumferential direction, and the battery negative plate B is located at the other axial end face of the winding shaft 1 and is uniformly distributed in the circumferential direction. After the multilayer battery positive plate A and the battery negative plate B are wound and stacked, the lugs are distributed in the above mode and are sequentially stacked along the axial direction, and finally, after the battery cell D is formed, all the lugs are inverted to the axial end face of the battery cell D.

The first compression roller group comprises a first roller 2, a second roller 3 and a first bracket, wherein a first conical compression part 2a is arranged on the circumferential surface of the first roller 2; a second tapered roller pressing portion 3a is provided on the circumferential surface of the second roller 3; the first roller 2 and the second roller 3 are respectively and rotatably mounted on the first bracket, and the second conical rolling part 3a and the first conical rolling part 2a are oppositely arranged and matched to form the first bending part.

In this embodiment, after the battery positive plate a passes through the gap between the first roller 2 and the second roller 3, the battery positive plate a forms a fit with the first roller 2 and the second roller 3 respectively, and when the battery positive plate a moves, the first roller 2 and the second roller 3 rotate under the action of the friction force of the battery positive plate a, that is, the first roller 2 and the second roller 3 are driven to rotate by the movement of the battery positive plate a. Since the first tab of the battery positive electrode tab a passes through the first tapered roller-pressing portion 2a and the second tapered roller-pressing portion 3a, the first tab of the battery positive electrode tab a is pressed by the second tapered roller-pressing portion 3a toward the first tapered roller-pressing portion 2a (as viewed in the drawing) during the rotation of the first roller 2 and the second roller 3, thereby the first tab of the battery positive electrode tab a is bent. Preferably, the first tapered roller sections 2a are arranged in one turn along the circumferential direction of the first roller 2, the second tapered roller sections 3a are arranged in one turn along the circumferential direction of the second roller 3, and the tapers of the first tapered roller sections 2a and the second tapered roller sections 3a are equal.

The first bracket comprises a first upper bracket 6, a first lower bracket 7 and a first driver 8 which enables the first upper bracket 6 and the first lower bracket 7 to form relative motion; both ends of the first roller 2 are respectively and rotatably arranged on the first upper bracket 6; both ends of the second roller 3 are respectively and rotatably arranged on the first lower bracket 7; when the first upper bracket 6 is in a fixed state and the first lower bracket 7 is in a movable state, the first driver 8 is connected with the first lower bracket 7; or when the first upper frame 6 is in a movable state and the first lower frame 7 is in a fixed state, the first driver 8 is connected to the first upper frame 6.

In this embodiment, it is preferable that the first upper bracket 6 is in a fixed state, the first lower bracket 7 is in a movable state, the first driver 8 is fixedly connected to the first upper bracket 6, the first driver 8 is connected to the first lower bracket 7, and the first driver 8 drives the first lower bracket 7 to move relative to the first upper bracket 6.

In this embodiment, before the winding, if the battery positive electrode sheet a does not pass through between the first roller 2 and the second roller 3 at this time, and if the distance between the first roller 2 and the second roller 3 is small, the first lower bracket 7 is driven by the first driver 8 to move so as to increase the distance between the first roller 2 and the second roller 3, so that the head of the battery positive electrode sheet a passes through the first roller 2 and the second roller 3, and after the head of the battery positive electrode sheet a is matched with the winding shaft 1, the first lower bracket 7 is driven by the first driver 8 to move so that the first roller 2 and the second roller 3 are respectively matched with the battery positive electrode sheet a (friction force is generated between the three), and when the battery positive electrode sheet a is wound, the first roller 2 and the second roller 3 can be driven to rotate by the battery positive electrode sheet a. Further, the first tapered roller portion 2a and the second tapered roller portion 3a bend the second electrode tab of the battery negative electrode sheet B.

The first bracket of this embodiment further includes a first slide rail 9, the first slide rail 9 is connected with the first upper bracket 6 and the first lower bracket 7 respectively, and the first upper bracket 6 or the first lower bracket 7 is guided by the first slide rail 9 when moving under the driving of the first driver 8. The first slide rail 9 is composed of a slide seat with a slide groove and a slide component, wherein the slide seat is fixed with the first lower bracket 7, the slide component is fixed with the first upper bracket 6, and the slide seat is in sliding fit with the slide groove.

The second pressing roller group comprises a third roller 4, a fourth roller 5 and a second bracket, and a third conical pressing part 4a is arranged on the circumferential surface of the third roller 4; a fourth tapered roller pressing portion 5a is provided on the circumferential surface of the fourth roller 5; the third roller 4 and the fourth roller 5 are respectively and rotatably arranged on the second bracket; the third tapered rolling portion 4a and the fourth tapered rolling portion 5a are arranged in opposite directions and cooperate to form the second bending portion. The first roller 2 and the fourth roller 5 are preferably metal rollers, which may be, for example, aluminum rollers, and the second roller 3 and the third roller 4 are preferably rubber rollers.

In this embodiment, the battery negative electrode sheet B passes through between the third roller 4 and the fourth roller 5, the battery negative electrode sheet B is respectively matched with the third roller 4 and the fourth roller 5, when the battery negative electrode sheet B moves, the third roller 4 and the fourth roller 5 rotate under the action of the friction force of the battery negative electrode sheet B, that is, the third roller 4 and the fourth roller 5 are driven by the movement of the battery negative electrode sheet B to rotate. Since the second tab of the negative battery tab B passes through the third tapered pressing portion 4a and the fourth tapered pressing portion 5a, the third roller 4 and the fourth roller 5 press the second tab of the negative battery tab B toward the fourth tapered pressing portion 5a (as viewed in the figure) by the third tapered pressing portion 4a during rotation, so that the second tab of the negative battery tab B is bent. Preferably, the third tapered nip 4a is arranged in one turn along the circumferential direction of the third roller 4, the fourth tapered nip 5a is arranged in one turn along the circumferential direction of the fourth roller 5, and the tapers of the third tapered nip 4a and the fourth tapered nip 5a are equal.

The second bracket comprises a second upper bracket 10, a second lower bracket 11 and a second driver 12 which enables the second upper bracket 10 and the second lower bracket 11 to form relative motion; both ends of the third roller 4 are respectively and rotatably arranged on the second upper bracket 10; both ends of the fourth roller 5 are respectively and rotatably installed on the second lower bracket 11; when the second upper frame 10 is in a fixed state and the second lower frame 11 is in a movable state, the second driver 12 is connected with the second lower frame 11; or when the second upper frame 10 is in a movable state and the second lower frame 11 is in a fixed state, the second driver 12 is connected to the second upper frame 10.

In this embodiment, it is preferable that the second upper frame 10 is in a fixed state, the second lower frame 11 is in a movable state, the second driver 12 is fixedly connected to the second upper frame 10, the second driver 12 is connected to the second lower frame 11, and the second driver 12 drives the second lower frame 11 to move relative to the second upper frame 10.

In this embodiment, before the winding, if the battery negative electrode sheet B does not pass through between the third roller 4 and the fourth roller 5, and, if the interval between the third roller 4 and the fourth roller 5 is small, the second lower bracket 11 is driven to move by the second driver 12, so as to increase the distance between the third roller 4 and the fourth roller 5, thereby facilitating the head of the battery negative plate B to pass through the third roller 4 and the fourth roller 5, matching the head of the battery negative plate B with the winding shaft 1, then the second lower bracket 11 is driven by the second driver 12 to move, so that the third roller 4 and the fourth roller 5 are respectively matched with the battery negative plate B (friction force is generated among the three), during winding, the battery negative plate B can drive the third roller 4 and the fourth roller 5 to rotate, the third tapered roller pressing portion 4a and the fourth tapered roller pressing portion 5a further bend the second tab of the battery negative electrode sheet B.

The second bracket in this embodiment further includes a second slide rail 13, the second slide rail 13 is respectively connected to the second upper bracket 10 and the second lower bracket 11, and the second upper bracket 10 or the second lower bracket 11 is guided by the second slide rail 13 when being driven by the second driver 12 to move. The second slide rail 13 is composed of a slide seat with a slide groove and a slide component, wherein the slide seat is fixed with the second lower bracket 11, the slide component is fixed with the second upper bracket 10, and the slide seat is in sliding fit with the slide groove.

The winding device of this embodiment further includes a pole piece guide assembly arranged on one side of the first compression roller set and/or the second compression roller set and used for guiding the battery pole piece, where the pole piece guide assembly includes a movable guide plate 14 and a third driver 15, and the movable guide plate 14 is connected with the third driver 15.

The pole piece guide assembly is provided to wind the separator C, which is usually two layers, around the winding shaft 1 at the start of winding, and to form a first pinch space between the two layers of separator C, so that the battery pole piece (for example, the battery positive pole piece a) close to the first pinch space can be fed into the first pinch space, and the battery positive pole piece a can be smoothly wound around the winding shaft 1 together with the separator C. However, for the negative electrode sheet B of the battery, since two layers of the separators C can only form one pinch space, in this embodiment, the guide plate 14 is pushed by the third driver 15 to rotate, so that the guide plate 14 forms a second pinch space with one of the separators C, the head of the negative electrode sheet B of the battery is placed in the second pinch space, and when the separator C is wound by the winding shaft 1, the negative electrode sheet B of the battery is wound by the winding shaft 1 along with the separator C. After the battery negative electrode tab B is wound on the winding shaft 1, the guide plate 14 is rotated in the reverse direction by the third driver 15.

In this embodiment, it is preferable that the movable guide plate 14 is composed of a guide plate body 14a and a shaft sleeve 14b, the guide plate body 14a is fixed to the shaft sleeve 14b, the shaft sleeve 14b is fitted over the third roller 4, and the third driver 15 is hinged to the guide plate body 14a, so that when the third driver 15 generates a pushing and pulling force on the guide plate body 14a, the guide plate body 14a is rotated forward or backward.

The embodiment further comprises a first curved surface guide assembly for guiding the first tab on the battery positive plate A after the first tab is bent, wherein the first curved surface guide assembly is positioned between the first compression roller set and the winding shaft 1. The purpose of setting up first curved surface guide assembly is to prevent to be rebounded by the first utmost point ear of bending on the battery positive plate A, further increases the stability of first utmost point ear shape promptly.

In this embodiment, the first curved surface guide assembly includes a first mounting seat 16 and a first curved surface guide plate 17, one end of the first mounting seat 16 is preferentially connected to the first roller 2, the other end of the first mounting seat 16 is connected to one end of the first curved surface guide plate 17, and the first curved surface guide plate 17 guides and presses the first tab a1 bent on the battery positive plate a, so that the first tab a1 is further shaped.

The embodiment further comprises a second curved surface guide assembly for guiding the bent second tab on the battery negative plate, wherein the second curved surface guide assembly is positioned between the second press roller set and the winding shaft 1. The purpose of the second curved surface guide assembly is to prevent the second tab bent on the battery negative plate B from rebounding, i.e., to further increase the stability of the shape of the second tab.

In this embodiment, the second curved guide assembly includes a second mounting seat 18 and a second curved guide plate 19, one end of the second mounting seat 18 is preferentially connected to the third roller 4, the other end of the second mounting seat 16 is connected to one end of the second curved guide plate 19, and the second curved guide plate 19 guides and presses the second tab B1 bent on the battery negative plate B, so as to further shape the second tab B1.

In this embodiment, the first bending portion and/or the second bending portion are/is provided with the protrusions 20 for forming the lines on the surface of the tab, in this embodiment, the protrusions 20 are preferably provided on the surfaces of the first tapered rolling portion 2a of the first roller 2 and the fourth tapered rolling portion 5a of the fourth roller 5, and the protrusions 20 are a plurality of and are uniformly distributed along the surface of the first tapered rolling portion 2a or the surface of the fourth tapered rolling portion 5 a. The lug on each battery pole piece is formed with grains through the convex part 20, the grains are preferably straight grains, and the strength of the lug can be enhanced.

Claims

1. Battery sheet's coiling mechanism, including coiling axle (1), its characterized in that still includes:

a first press roller group which is arranged at the side part of the winding shaft (1) and is provided with a first bending part for bending a plurality of first tabs (A1) on the battery positive plate (A) along the same direction when the battery positive plate (A) passes through the first press roller group;

and a second press roller group which is arranged at the side part of the winding shaft (1), wherein the second press roller group is provided with a second bending part which enables the battery negative plate (B) to bend a plurality of second tabs (B1) on the battery negative plate (B) along the same direction when the battery negative plate (B) passes through the second press roller group.

2. The winding device of battery pole piece according to claim 1, characterized in that the first press roller group comprises:

a first roller (2), wherein a first tapered roller pressing part (2a) is arranged on the circumferential surface of the first roller (2);

a second roller (3) having a second tapered nip portion (3a) on the circumferential surface of the second roller (3);

the first bracket, the first roller (2) and the second roller (3) are respectively and rotatably arranged on the first bracket;

the second tapered roller pressing portion (3a) and the first tapered roller pressing portion (2a) are arranged in opposite directions and cooperate to form the first bending portion.

3. The winding device of battery pole pieces, according to claim 1, characterized in that the second compression roller group comprises:

a third roller (4), wherein a third conical rolling part (4a) is arranged on the circumferential surface of the third roller (4);

a fourth roller (5), wherein a fourth tapered roller pressing part (5a) is arranged on the circumferential surface of the fourth roller (5);

the third roller (4) and the fourth roller (5) are respectively and rotatably arranged on the second bracket;

the third tapered rolling portion (4a) and the fourth tapered rolling portion (5a) are arranged in opposite directions and are matched to form the second bending portion.

4. The winding device of a battery pole piece according to claim 2, wherein the first support comprises:

the two ends of the first roller (2) are respectively and rotatably arranged on the first upper bracket (6);

the two ends of the second roller (3) are respectively and rotatably arranged on the first lower bracket (7);

a first driver (8) which enables the first upper bracket (6) and the first lower bracket (7) to form relative motion;

when the first upper bracket (6) is in a fixed state and the first lower bracket (7) is in a movable state, the first driver (8) is connected with the first lower bracket (7); or

When the first upper bracket (6) is in a movable state and the first lower bracket (7) is in a fixed state, the first driver (8) is connected with the first upper bracket (6).

5. The winding device of the battery pole piece is characterized by further comprising a first sliding rail (9), wherein the first sliding rail (9) is respectively connected with the first upper bracket (6) and the first lower bracket (7), and the first upper bracket (6) or the first lower bracket (7) is guided by the first sliding rail (9) when driven by the first driver (8) to move.

6. The winding device of battery pole pieces of claim 3, wherein the second bracket comprises:

the two ends of the third roller (4) are respectively and rotatably arranged on the second upper bracket (10);

the two ends of the fourth roller (5) are respectively and rotatably arranged on the second lower bracket (11);

a second driver (12) which enables the second upper bracket (10) and the second lower bracket (11) to form relative motion;

when the second upper bracket (10) is in a fixed state and the second lower bracket (11) is in a movable state, the second driver (12) is connected with the second lower bracket (11); or

When the second upper bracket (10) is in a movable state and the second lower bracket (11) is in a fixed state, the second driver (12) is connected with the second upper bracket (10).

7. The winding device of battery pole piece according to any one of claims 1 to 6, characterized in that, the device further comprises a pole piece guiding component which is arranged at one side of the first compression roller group and/or the second compression roller group and guides the battery pole piece, the pole piece guiding component comprises: the movable guide plate (14) and the third driver (15), wherein the movable guide plate (14) is connected with the third driver (15).

8. The winding device of the battery pole piece according to the claim 1, 2, 4 or 5, characterized in that, the winding device further comprises a first curved surface guide component for guiding the bent first tab (A1) on the battery positive pole piece (A), and the first curved surface guide component is positioned between the first compression roller group and the winding shaft (1).

9. The winding device of the battery pole piece according to claim 1, 3 or 6, further comprising a second curved guide assembly for guiding the bent second tab (B1) on the battery negative pole piece (B), wherein the second curved guide assembly is positioned between the second compression roller set and the winding shaft (1).

10. The winding device of battery pole piece according to any one of claims 1 to 6, characterized in that the first and/or second bending part is provided with a protrusion (20) for texturing the surface of the tab.