CN114976187A

CN114976187A - Battery cell winding device

Info

Publication number: CN114976187A
Application number: CN202210652476.8A
Authority: CN
Inventors: 叶宗锋; 杨德伟; 杨永忠
Original assignee: Suzhou Jieruisi Intelligent Technology Co ltd
Current assignee: Suzhou Jieruisi Intelligent Technology Co ltd
Priority date: 2022-06-08
Filing date: 2022-06-08
Publication date: 2022-08-30

Abstract

The invention discloses a battery cell winding device which comprises a turret, a winding needle and a cutting mechanism, wherein the turret rotates around a central shaft, and the winding needle and the cutting mechanism are arranged on the turret. The turret is provided with a winding station and at least one back winding station, wherein the winding station and the back winding station are respectively provided with a winding needle and are respectively positioned at the winding station and the back winding station along with the rotation of the turret. The cutting mechanism is arranged between the winding station and the rear winding station, and comprises a cutter, an upper pressing piece and an upper pressure-bearing piece which are arranged above the cutter, and a lower pressing piece and a lower pressure-bearing piece which are arranged below the cutter, and are used for clamping a material belt to be cut from the upper side and the lower side of the cutter respectively. At least one of the upper pressing piece, the upper pressure bearing piece, the lower pressing piece and the lower pressure bearing piece is a roller with limited rotation. The cell winding device can allow the winding needle to start the winding operation and/or the post-winding operation immediately after the material belt is cut off, thereby improving the winding efficiency.

Description

Battery cell winding device

Technical Field

The invention belongs to the field of battery manufacturing equipment, and particularly relates to a battery core winding device for secondary battery core manufacturing equipment.

Background

The battery cell winding device is a device for sequentially winding a positive plate material belt, a negative plate material belt and a diaphragm material belt to form a battery cell and finishing ending and discharging. In order to improve the winding efficiency, the currently used cell winding device is generally provided with multiple stations, such as a two-station winding device shown in fig. 1(a) and a three-station winding device shown in fig. 1 (b). In the multi-station battery cell winding device, the winding, ending, rubberizing and blanking of the battery cell are set to be realized at different stations.

Taking the two-station winding device shown in fig. 1(a) as an example, after the tape formed by overlapping the pole piece and the diaphragm is completely wound on the first winding needle 110 of the station P1, the turret 100 rotates to switch the first winding needle 110 to the station P2 to perform winding operations such as ending, gluing, blanking, and the like, and at this time, the second winding needle 120 originally at the station P2 is switched to the station P1 to clamp the tape. The die cutter 130 and a carrier 139 then grip the web between stations P1, P2 and cut it, and the die cutter 130 and carrier 139 are then driven apart to release the web. When the tape is released, the winding needle 110 at the station P1 starts to perform winding operation, and the winding needle 110 at the station P2 starts to perform winding operation after ending, pasting, blanking, and the like.

There is a need to improve the winding efficiency of the winding-mode cell winding device.

Disclosure of Invention

The invention aims to provide a cell winding device with high winding efficiency.

In order to achieve the above object, the cell winding device of the present invention includes a turret rotating around a central axis, the turret has a winding station and at least one post-winding station, the winding station and the post-winding station are respectively provided with a winding needle, and the turret drives the winding needle to rotate around the central axis so as to make the winding needle respectively located at the winding station and the post-winding station. And a cutting mechanism is arranged between the winding station and the rear winding station. The shutdown mechanism includes a cutter and sets up and last casting die, last bearing spare and the lower casting die, the lower bearing spare that are located the cutter below of cutter top, go up the casting die and be used for waiting to cut the product at cutter upside centre gripping with last bearing spare, lower casting die and lower bearing spare are used for should waiting to cut the product at cutter downside centre gripping. At least one of the upper pressing piece, the upper pressure bearing piece, the lower pressing piece and the lower pressure bearing piece is a roller with limited rotation.

In an embodiment of the present invention, the roller with limited rotation is a damping roller, the damping roller includes a mandrel, a roller body rotatably sleeved on the circumference of the mandrel, and an end cover sleeved on the circumference of the mandrel and used for closing an opening between the mandrel and the roller body, and a damping member is arranged in a closed space formed by the end cover, the roller body and the mandrel.

In one embodiment of the invention, the rotation-limited roller comprises a mandrel and a roller body which rotate together, one end of the mandrel is connected with a damper, and the damper is used for providing a damping force for limiting the free rotation of the mandrel and the roller body.

In one embodiment of the invention, the damper comprises a fixed disc and a rotating disc which are coaxially arranged, and a damping piece is arranged between the fixed disc and the rotating disc; the mandrel is fixedly connected with the rotating disc, the fixed disc is fixedly connected to a mounting plate, and the mounting plate is fixed relative to the cutting mechanism.

In an embodiment of the present invention, the damper includes a nut coaxially disposed with the fixed disk and the rotating disk, and the nut is disposed on a side of the fixed disk away from the rotating disk, and the nut is screwed in/out on the shaft to adjust the damping force of the damping member.

In an embodiment of the invention, the nut is disposed in an opening of the mounting plate.

In an embodiment of the invention, the damper is an electromagnetic damper.

In one embodiment of the invention, the damper is a friction block driven toward and away from the spindle and limits the free rotation of the spindle when the friction block is near the spindle.

In an embodiment of the present invention, the friction block has an inclined surface disposed along a cutting direction of the cutter, and the inclined surface is moved along the cutting direction to rub against the mounting shaft; at least one of the bevel and the spindle is provided with a friction pad.

In one embodiment of the invention, the means for holding the product to be cut in engagement with the roller with limited rotation is a free-running roller.

In an embodiment of the present invention, the winding needles are respectively connected to a rotary driving motor, and the rotary driving motor receives a cutting signal of the product to be cut to start the operation of the corresponding station

In summary, the cell winding device of the invention may allow the winding needle to start the winding operation and/or the post-winding operation immediately after the tape is cut, without waiting for the tape to be released, thereby reducing the waiting time and improving the winding efficiency.

Drawings

Fig. 1(a) is a schematic structural diagram of a two-station cell winding device;

fig. 1(b) is a schematic structural view of a three-station cell winding apparatus;

FIG. 2 is a schematic diagram of the embodiment of the cutting mechanism of FIG. 1;

FIG. 3 is a side view of a push-to-cut element of the severing mechanism of FIG. 2;

FIG. 4 is a schematic view of a carrier in the cleaving mechanism of FIG. 2;

FIG. 5 is a schematic view of another embodiment of the press-cut piece;

FIG. 6 is a top view of the die cut piece of the embodiment of FIG. 5;

fig. 7 is a schematic structural view of a press-cut piece in still another embodiment.

Detailed Description

The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.

As shown in fig. 1(a), the battery cell winding device of the present embodiment includes a turret 100 configured to rotate around a center of a circle, and a plurality of winding pins 110 disposed on the turret 100. The rotary turret 100 is provided with a winding station P1 and a rear winding station P2, the winding needle 100 is located at the winding station P1 to perform a cell winding operation, and when the winding needle is located at the rear winding station, the subsequent operations of cell ending, gluing, blanking and the like after winding are performed. The number of the winding needles is based on the number of the stations of the turret 100, so as to ensure that the winding needles at each station perform corresponding operations. Each winding needle 110 is connected with a rotary driving motor for controlling the winding needle 110 to rotate around the axis thereof on the station, so as to wind the material belt into the battery cell. The present embodiment has two winding needles 110 respectively disposed on a circular ring of the same radius from the center of the circle on the turret 100, and thus can be switched at the stations P1, P2 to perform corresponding operations as the turret 100 rotates.

The cell winding device of the embodiment is also provided with a film combining roller near the winding station P1. The film combining roller consists of two

rollers

121 and 122 which are oppositely arranged and can be driven to relatively close and far away, the positive plate S1, the negative plate S2, the first diaphragm S3 and the second diaphragm S4 penetrate between the two rollers 121/122 and are pressed and overlapped into a material belt through the film combining roller 120, the material belt is guided to the winding station P1 and is clamped and fixed by a winding needle 110 at the station, and then the winding operation can be started by rotating the winding needle.

When the winding is about to be finished, the positive and negative pole pieces S1 and S2 are cut off and wound on the battery cell on the winding needle 110 along with the diaphragms S3 and S4, then the turret 100 rotates to drive the winding needle 110 to switch to a rear winding station P2, and at this time, the material belt formed by only the first diaphragm S3 and the second diaphragm S4 is also pulled to the rear winding station P2; meanwhile, the winding needle 110, which is originally at the station P2, is switched to the station P1 and clamps the tape. A cutting mechanism is then driven adjacent the strip of material, clampingly securing and cutting the strip of material between the winding station P1 and the post-winding station P2. The strip is cut into two sections, the winding needle 110 at the winding station P1 performs winding operation, and the winding needle 110 at the rear winding station P2 performs ending, gluing, blanking and other operations.

In the cell winding device of the embodiment, through the design of the cutting mechanism, the winding needle at least located at the winding station P1 can start the winding operation after the tape is cut and before the tape is released, so that the waiting time of the winding needle is reduced, and the winding efficiency is improved. To achieve the purpose, the cutting mechanism can provide a limited clamping force F for the free end of the material belt formed after cutting, so that when the tensile force of the material belt from the winding needle during winding is greater than the clamping force F, the free end of the material belt can be pulled away from the clamping of the cutting mechanism along the direction of the tensile force; when the pulling force of the material belt from the winding needle during winding is smaller than the clamping force F, the material belt cannot be pulled away, and therefore the clamped state is maintained. The clamping force should generally not exceed the maximum tensile force to which the strip of material is subjected to avoid the strip of material being damaged by the tension.

The structure of the cutting mechanism will be described in detail below with reference to the embodiments of fig. 2, 3, and 4.

As shown in fig. 2, the cutting mechanism includes a pressing cutting member 130 and a carrying member 139 disposed oppositely. The pressing and cutting member 130 includes a plate-shaped body 131, and first and

second sidewalls

132 and 133 disposed at both sides of the plate-shaped body 131. A cutter 134 is disposed in the hexahedral space defined by the plate-shaped body 131 and the two

side walls

132 and 133, and the cutter 134 is configured to be driven to protrude to a side away from the plate-shaped body 131 to perform a tape cutting operation. Correspondingly, an opening is provided on the plate-shaped body 131, so that the working member of the driving member 135 can directly or indirectly extend into the hexahedral space through a connecting block to be connected with the cutter 134. The driving member 135 of the present embodiment is implemented by a cylinder; in order to make the cutter 134 move smoothly, a plurality of linear bearings 136 are further disposed between the cylinder and the cutter 134.

The press cutting member 130 further includes upper and

lower press members

137, 138 disposed between the first and

second side walls

132, 133. The lower press member 138 includes a lower mounting plate 1381 having a flat plate shape and a lower roller 1382 mounted on a front end of the lower mounting plate 1381, and both side surfaces of the lower mounting plate 1381 are respectively provided with at least one mounting hole. Lower ends of the

side walls

132 and 133 are provided with a plurality of

lower holes

1321 and 1331, respectively, in the cutting direction of the cutter 134. A lower mounting plate 1381 is disposed between the

side walls

132, 133 and a lower roller 1382 is mounted between the first side wall 132 and the second side wall 133 and below the cutter 134 by securing the mounting holes in the different

lower holes

1321, 1331. Alignment of the different lower holes 1321/1331 may provide for the extension of the lower roller 1382 in the cutting direction.

As shown in fig. 4, the bearing member 139 includes a plate-like body 1391, and an upper bearing member 1392 corresponding to the upper pressing member 137 and a lower bearing member 1393 corresponding to the lower pressing member 138, which are provided on the plate-like body 1391. Between the upper and

lower pressure members

1392, 1393 is a receiving space 1394 which provides for the cutter 134 to project forwardly when severing the strip of material. In this embodiment, the upper and lower

pressure bearing members

1392, 1393 are implemented by rollers that can rotate freely. In other embodiments, the receiving space between the upper and

lower bearing members

1392, 1393 can be replaced by a cutting pad or stop to act as a stop and anvil during severing.

Referring to fig. 2 and 3, upper pressing member 137 includes a damping roller 1371, where damping roller 1371 includes a mandrel 1372, a cylinder 1373 sleeved outside mandrel 1372, and two end covers 1374 sleeved on mandrel 1372 and used for closing an opening of a circular ring between mandrel 1372 and cylinder 1373, so that a closed space is formed among mandrel 1372, cylinder 1373, and two end covers 1374. The enclosed space is filled with viscous grease so that when the cylinder 1373 rotates relative to the spindle 1372, a damping force is applied to resist the rotation. As mentioned above, the damping force of the damping roller 1371 is selected to be slightly less than the pulling force applied to the strip of material when the winding needle 110 winds the strip of material and the maximum pulling force that the strip of material can bear.

The two ends of the spindle 1372 are fixed to an upper mounting plate 1375, and are assembled to the first and

second sidewalls

132 and 133 through the two upper mounting plates 1375, and are located above the cutter 134 and vertically opposite to the lower roller 1382. The specific installation mode can refer to the installation structure of the lower roller 1382 and is not repeated.

The following describes the operation process of the cell winding device of the present embodiment.

When the winding needle 110 at the winding station P1 finishes winding, the turret 100 rotates to switch the winding needle 110 to the post-winding station P2, and the winding needle 110 originally at the post-winding station P2 is switched to the winding station P1 to clamp the material tape and prepare to start winding operation. Subsequently, the press cutter 130 of the cutting mechanism is driven integrally to the side of the carrier 139 so that the damping roller 1371 and the lower roller 1382 press the strip against the upper and lower pressure-bearing

pieces

1392, 1393 of the carrier 139. Then, the air cylinder as the driving unit 135 drives the cutter 134 to cut the tape.

After the material belt is cut off, the two free ends of the cut material belt are respectively clamped by the damping roller 1371/the upper bearing piece 1392 and the lower roller 1382/the lower bearing piece 1393. Since the damping roller 1371 as the upper pressing member 137 can generate a certain damping force to the rotation, the winding pin 110 at the winding station P1 does not have to wait for the pressing and cutting member 130 of the cutting mechanism to be driven away from the carrier 139 and release the tape before starting the winding operation, but controls the driving motor of the winding pin 110 to start the winding operation immediately after receiving the signal that the tape is cut. The cut-off signal can be obtained by monitoring the real-time position of the cutting blade 134 by means of a position sensor, or by monitoring the travel of the drive member 135 by means of, for example, a magnetic scale. Because the tension applied to the material belt when the winding needle 110 rotates is greater than the damping force of the damping roller 1371, the damping roller 1371 can rotate under the tension and release the free end of the material belt, and the material belt cannot be damaged.

Therefore, the waiting time of the winding station P1 can be shortened, and the winding efficiency can be improved.

Fig. 4-5 illustrate another embodiment of a cleaving mechanism. In this embodiment, the upper press includes an upper press roller 1371 ', and the shaft 1372' and cylinder 1373 'of the upper press roller 1371' are fixedly coupled and do not rotate relative to each other, so that the shaft 1372 'is rotatably assembled to the two upper mounting plates 1375' at both ends. One end of the shaft 1372' is coupled to a damper plate 1377 and a damper 140 via a coupling 1376.

The damper 140 includes a fixed disc 141 and a rotating disc 142 coaxially disposed and capable of rotating relatively, and a damping member is disposed between the fixed disc 141 and the rotating disc 142, and the damping member is implemented by selecting a plurality of gaskets or a compression spring or a torsion spring sleeved on the damper shaft. A nut 143 is disposed on a side of the fixed disk 141 away from the rotating disk 142, and one or more spacers may be disposed between the nut 143 and the fixed disk 141. By screwing in/out the nut 143, a damping force (i.e., a frictional force between a plurality of washers or an elastic force of a compression spring/torsion spring) of the relative rotation of the fixed disk 141 and the rotating disk 142 can be adjusted.

The damper disk 1377 of the upper pressing member 137' is locked with the rotary disk 142 of the damper 140, and the fixed disk 141 of the damper 140 is fixed to a mounting plate 145. The mounting plate 145 is fixed relative to the upper mounting plate 1375 to provide mounting support for the damper 140. The mounting plate 145 has an opening through which the nut 143 of the damper 140 is exposed, thereby facilitating adjustment of the damping force of the damper 140.

The cutting mechanism of this embodiment can adjust the damping force when the upper compression roller 1371' rotates by adjusting the nut of the damper 140, so that the material belt can adapt to different bearing tension and winding tension of the winding needle, which facilitates the application range of the battery cell winding device.

It is noted that in this embodiment, the damper 140 may be implemented using other types of rotary dampers, such as an electromagnetic damper, and the like.

Fig. 6 shows yet another embodiment of the severing mechanism. In this embodiment, the damping force is achieved by a friction block 150. Specifically, upper press 137 "includes an upper press roller 1371", and a core shaft 1372 "and a cylinder 1373" of upper press roller 1371 "are fixedly coupled and do not rotate relative to each other, so that core shaft 1372" is rotatably assembled to two upper mounting plates 1375 "at both ends. One end of the spindle 1372 "extends out the side of the upper mounting plate 1375". The friction block 150 has a friction surface angled with respect to the cutting direction of the cutter 134 and the friction block 150 may be driven so that its friction surface adjustably contacts the spindle 1373 ". The damping force of the upper press roll 1371 ″ can be adjusted at any time due to the controllable contact force. To avoid slipping, rubber-like friction pads are provided on the inclined surfaces of the spindle 1373 "and the friction block 150 to provide a sufficiently stable damping force.

The above embodiments have been described with reference to a two-station winding apparatus, but these embodiments can also be applied without distinction to a three-station winding apparatus shown in fig. 1 (b). In the three-station winding apparatus, the function of the rear winding station P2 is divided into a taping station P2 'and a blanking station P3', which are uniformly disposed on the turret 100, and each station corresponds to one winding needle 110. At this time, the cutting mechanism is provided between the winding station P1 and the pasting station P2' to cut the tape.

The foregoing embodiments may also be modified to meet different conditions of production practice without departing from the scope of the present disclosure. For example, in order to meet the design space limitation of a specific device, the

upper press rollers

1371, 1371', 1371 ″ can be selected from freely rotating rollers, and the upper pressure bearing member 1392 matched with the rollers to clamp the material belt is set as a roller with limited rotation, which can also save the waiting time of winding needles of the winding station and improve the production efficiency.

In other production practices, if the post-winding operation takes longer than the winding operation, saving the post-winding operation time is beneficial to improving production efficiency. Under the condition, the lower roller can be set to be the roller capable of rotating in a limited mode, the upper pressing roller can be realized by selecting the roller capable of rotating freely, time consumption of a winding station is low, and winding operation is not influenced after the material belt is released.

It should be noted that the clamping of the strip of material may also be achieved without the use of rollers, in which case the clamping blocks or plates may be used, on the side of the station where the operation can be started again after the strip of material has been released. For example, when the winding station takes a long time, the upper pressing member and the upper bearing member close to the winding station are realized by a roller with limited rotation and a roller with free rotation, and the lower pressing member and the lower bearing member close to one side of the rear winding station can realize the clamping of the material belt by a clamping block and/or a clamping plate. Thus, the overall efficiency of the cell winding device of the invention is not affected.

The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.

Claims

1. A cell winding device comprises a turret rotating around a central shaft, wherein the turret is provided with a winding station and at least one rear winding station, the winding station and the rear winding station are respectively provided with a winding needle, and the turret drives the winding needle to rotate around the central shaft so as to enable the winding needle to be respectively positioned at the winding station and the rear winding station; a cutting mechanism is arranged between the winding station and the back winding station and comprises a cutter, an upper pressing piece and an upper pressure-bearing piece which are arranged above the cutter, and a lower pressing piece and a lower pressure-bearing piece which are arranged below the cutter, wherein the upper pressing piece and the upper pressure-bearing piece are used for clamping a product to be cut on the upper side of the cutter, and the lower pressing piece and the lower pressure-bearing piece are used for clamping the product to be cut on the lower side of the cutter; it is characterized in that at least one of the upper pressing piece, the upper pressure-bearing piece, the lower pressing piece and the lower pressure-bearing piece is a roller with limited rotation.

2. The cell winding device according to claim 1, wherein the roller with limited rotation is a damping roller, the damping roller comprises a mandrel, a roller body rotatably disposed around the mandrel, and an end cap disposed around the mandrel and used for closing an opening between the mandrel and the roller body, and the end cap, the roller body and the mandrel form a closed space having a damping member therein.

3. The cell winding device of claim 1, wherein the limited rotation roller comprises a co-rotating mandrel and a roller body, wherein one end of the mandrel is connected to a damper for providing a damping force that limits the free rotation of the mandrel.

4. The cell winding device of claim 3, wherein the damper comprises a fixed disc and a rotating disc coaxially arranged, and the damping member is arranged between the fixed disc and the rotating disc; the mandrel is fixedly connected with the rotating disc, the fixed disc is fixedly connected to a mounting plate, and the mounting plate is fixed relative to the cutting mechanism.

5. The cell winding device according to claim 4, wherein the damper includes a nut coaxially disposed with the fixed disk and the rotatable disk, and the nut is disposed on a side of the fixed disk away from the rotatable disk, and the nut is screwed in/out on the shaft to adjust a damping force of the damping member.

6. The cell winding device of claim 5, wherein the nut is disposed in an opening in the mounting plate.

7. The cell winding device of claim 3, wherein the damper is a friction block that is driven toward and away from the mandrel and limits free rotation of the mandrel when the friction block is adjacent the mandrel.

8. The cell winding device according to claim 7, wherein the friction block has a bevel disposed along a cutting direction of the cutter, and the bevel is moved along the cutting direction to rub against the mounting shaft; at least one of the ramp and the spindle is provided with a friction pad.

9. The cell winding device of claim 1, wherein the engagement member for engaging the rotation-limited roller to grip the product to be cut is a free-wheeling roller.

10. The cell winding device according to claim 1, wherein the winding pins are respectively connected to a rotary driving motor, and the rotary driving motor receives a cutting signal of the product to be cut to start the operation of the corresponding station.