CN115472920A

CN115472920A - Lug pre-pressing device and turret mechanism

Info

Publication number: CN115472920A
Application number: CN202211148040.1A
Authority: CN
Inventors: 万志永; 杨斌坤; 王盼; 邱毅
Original assignee: Suzhou Jieruisi Intelligent Technology Co ltd
Current assignee: Suzhou Jieruisi Intelligent Technology Co ltd
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2022-12-13

Abstract

The invention discloses a tab pre-pressing device which is used for bending tabs of a battery cell wound on a winding needle. This utmost point ear pre-compaction device is including an axle and install the pre-compaction unit on this axle, axle and this book needle parallel arrangement, the pre-compaction unit includes a pre-compaction face, and this pre-compaction face is used for buckling the utmost point ear of electric core. The shaft is elastically mounted on a base, and a support unit is arranged on the shaft and used for supporting the battery cell and elastically compressing the shaft towards one side of the base. The invention can pre-press and bend the pole ear of the battery cell at a specific angle in the winding process of the battery cell, and can gradually get away from the winding needle along with the increase of the diameter of the battery cell so as to pre-press and bend the pole ear at the outermost layer of the battery cell, thereby improving the pre-pressing effect of the pole ear.

Description

Lug pre-pressing device and turret mechanism

Technical Field

The invention belongs to the field of lithium battery automation equipment, and particularly relates to a battery cell winding device.

Background

In the production of lithium batteries, a material belt consisting of a positive plate, a negative plate and a diaphragm needs to be wound to form a battery core. The positive plate and the negative plate are provided or formed with a plurality of tabs which are metal conductors leading the positive and negative electrodes out. The conventional winding battery cell has different structures such as a single-pole lug, a multi-pole lug and a full-pole lug, and the pole lugs are distributed at one end or two ends of the winding battery cell in a laminating manner. After the winding of the battery cell is completed, the tabs need to be uniformly bent towards the center of the cross section of the battery cell, and the process is called tab shaping. The shaped pole ear is gathered inwards, so that the battery cell is conveniently arranged in the shell.

In general, the tab is shaped after the cell is wound. Because the pole lug after the completion of winding is in a laminated arrangement, the pole lug is difficult to bend, and the pole lug shaping effect is poor.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a device for pre-pressing a pole lug in a cell winding process, and provides a turret mechanism with the pole lug pre-pressing device.

The lug prepressing device provided by the invention is used for bending the lugs of the battery core wound on the winding needle. This utmost point ear pre-compaction device is including an axle and install the pre-compaction unit on this axle, axle and this book needle parallel arrangement, the pre-compaction unit includes a pre-compaction face, and this pre-compaction face is used for buckling the utmost point ear of electric core. The shaft is elastically installed on a base, and a supporting unit is arranged on the shaft and used for supporting the battery cell and elastically compressing the shaft towards one side of the base.

In an embodiment of the tab pre-pressing device of the present invention, two guide rods are disposed on the shaft perpendicular to the axial direction of the shaft, a spring is respectively sleeved on each guide rod and is respectively disposed in a guide hole of the base, one end of the spring abuts against the shaft, and the other end abuts against the base.

In an embodiment of the tab preloading device of the present invention, a linear bearing is disposed in the guide hole, and the free end of the guide rod is disposed in the linear bearing.

In an embodiment of the tab pre-pressing device of the present invention, the shaft is provided with two movable rails perpendicular to an axis thereof, the base is provided with two fixed rails, and the two movable rails and the two fixed rails cooperate to form two slide rail structures; the sliding rail structures are respectively provided with a spring which is arranged between the shaft and the base.

In an embodiment of the tab preloading device of the present invention, both ends of the shaft are rotatably disposed on the base along the axis thereof; the prepressing unit and the supporting unit are respectively and fixedly arranged on the shaft, and the prepressing surface of the prepressing unit is realized by adopting a conical surface.

In an embodiment of the tab preloading device of the present invention, the conical surface has one end with a large cross section and one end with a small cross section, wherein the end with the small cross section is disposed opposite to the supporting unit, and the diameter of the end with the small cross section is equal to the diameter of the supporting unit.

In an embodiment of the tab pre-pressing device of the present invention, the pre-pressing unit includes a cylindrical main body, a cross-sectional diameter of the cylindrical main body is equal to a diameter of a smaller cross-sectional end of the pre-pressing surface, the cylindrical main body is supported on a side wall of the electrical core, and the smaller cross-sectional end of the pre-pressing surface contacts a root of the tab.

In an embodiment of the tab pre-pressing device of the present invention, two ends of the shaft are fixedly disposed on the base; the supporting unit is rotatably arranged on the shaft, and the pre-pressing unit is fixed on the shaft and is provided with a pre-pressing surface bending towards the pole lug.

The invention also discloses a turret mechanism which comprises a main turret and an auxiliary turret which are oppositely arranged, wherein a main shaft is fixedly connected between the main turret and the auxiliary turret, and the main turret and the auxiliary turret are respectively provided with a plurality of groups of winding needles. The turret mechanism further comprises a plurality of groups of lug prepressing devices, bases of the lug prepressing devices are fixedly mounted on the main shaft, and shafts of the lug prepressing devices are parallel to the winding needle.

In another embodiment, the turret mechanism comprises a circular turntable and a winding needle arranged in the center of the turntable, wherein the winding needle can rotate around the axis of the winding needle and extends out of and retracts back from the surface of the turntable. This capstan head mechanism still includes a set of utmost point ear pre-compaction device, utmost point ear pre-compaction device is installed roll up needle one side, just utmost point ear pre-compaction device's axle with roll up the needle and parallel.

In conclusion, the pre-pressing unit arranged in parallel with the winding needle can pre-press and bend the pole lug of the battery cell at a specific angle in the winding process, and meanwhile, the pre-pressing unit can gradually get away from the winding needle along with the gradual increase of the diameter of the battery cell so as to pre-press and bend the pole lug on the outermost layer of the battery cell, so that the pole lug pre-pressing effect is improved.

Drawings

FIG. 1 is a block diagram of one embodiment of a turret mechanism of the present invention;

FIG. 2 is a cross-sectional view of the turret mechanism of FIG. 1 taken along line II-II;

fig. 3 is a structural diagram of a set of tab preloading devices and a set of winding pins in fig. 1;

FIG. 4 is a structural diagram of the pre-pressing unit in FIG. 3;

FIG. 5 is a view showing an installation structure of the supporting unit and the shaft of FIG. 3;

FIG. 6 is a block diagram of another embodiment of a turret mechanism of the present invention;

FIG. 7 is a structural view of the pre-pressing unit in FIG. 6;

fig. 8 is a structural view of still another embodiment of a tab preloading device of the present invention.

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 and 2, a turret mechanism 100 according to an embodiment of the present invention includes a main turret 101, a sub turret 102, and a main shaft 103 disposed on the axis of the main turret 101 and the sub turret 102, and the main shaft 103 is fixedly connected to the main turret 101 and the sub turret 102, thereby ensuring synchronous rotation of the two. A winding station P1, a rubberizing station P2 and a blanking station P3 are uniformly arranged on the main turret 101 around the center of the main turret, and each station is provided with a first winding needle 110. The sub-turret 102 is provided with a second winding needle 120 corresponding to the aforementioned stations P1-P3, respectively. A first winding needle 110 and a second winding needle 120 which are located at the same station are driven by respective motors to relatively extend to form a winding needle group, the winding needle group can clamp a material belt formed by the positive pole piece, the negative pole piece and the diaphragm, and the material belt is wound on the winding needle group to form the battery cell C. After the cell C is wound, a rubberizing process is performed to prevent the cell C from being unraveled, and then the first winding pin 110 and the second winding pin 120 are relatively retracted under the driving of respective motors to be drawn out from the cell C, so that the cell C can be taken away by a clamping unit. The main turret 101 and the auxiliary turret 102 rotate around the main shaft 103, so that different winding stages of the battery cells are performed at corresponding stations. The structure and operation of the above turret mechanism is conventional in the art and will not be described in detail herein.

The present embodiment illustrates the concept of the present invention in connection with a turret mechanism for a pin. The meaning of the needle insertion is that the first winding needle 110 and the second winding needle 120 are oppositely arranged along the axial direction, the extending action is that the two winding needles are relatively close, and the drawing action is that the two winding needles are relatively far. However, there is also a turret mechanism for the same direction pin, i.e. the extending and withdrawing actions of the first winding pin and the second winding pin are performed in the same direction, which is described in the chinese patent application No. CN111403823A and will not be repeated here. As will be seen from the following description, the tab preloading device of the present invention can be applied to a turret mechanism for a pin counter structure and a turret mechanism for a pin in the same direction without distinction.

As shown in fig. 3, a tab preloading device 200 according to an embodiment of the present invention is disposed on the main shaft 103 of the turret mechanism 100, and includes a base 210 and a shaft 220 elastically disposed on the base 210, wherein the shaft 220 is mounted with at least one preloading unit 230 for bending tabs and a supporting unit 240 for supporting to an outer sidewall of the battery cell C. The preload unit 230 has a preload surface 231 inclined at an angle with respect to the axis of the shaft 220, and the inclination angle of the preload surface 231 depends on the angle of the tab to be bent, so that the tab of the cell C can be bent at a predetermined angle in a predetermined direction (generally, in a direction toward the axis of the cell).

As shown in fig. 4, the pre-pressing unit 230 of the present embodiment is implemented by a conical wheel, a main body of the conical wheel is cylindrical, and a mounting hole 232 is formed through an axis of the conical wheel for being fixedly mounted on the shaft 220. One end of the conical wheel has a conical surface as the pre-pressing surface 231, and the generatrix of the conical surface extends towards the axis thereof and thus presents an inclined surface inclined towards the axis, the inclination angle of which is determined by the angle at which the tab is to be bent.

For convenience of installation, the cylindrical part of the main body of the cone wheel is cut to form a main body part 233 and a fastening ring part 234, each of which has a semicircular slot, and when the two are assembled in a butt joint manner, the two slots together form the installation hole 232; the body portion 233 is provided with a first threaded hole 2331, and the collar portion 234 is provided with a second threaded hole 2341. The tapered wheel is mounted to the shaft 220 by screwing the first and second threaded

holes

2331, 2341 together when the two are engaged. By loosening the screws, the position of the cone wheel on the shaft 220 can be quickly adjusted so that the pre-pressing surface 231 is aligned with the tabs of cells of different lengths.

As shown in fig. 5, the supporting unit 240 of this embodiment is implemented by using a rubber-covered wheel, and a side surface of the rubber-covered wheel is a flat cylindrical surface, and the side surface is used for supporting on the battery cell C. The rubber covered wheel is sleeved on the shaft 220 through a hole in the middle. A locking groove 221 is formed in the shaft 220 along the axial direction of the shaft, a plurality of fixing holes 241 are formed in the rubber covered wheel along the radial direction of the rubber covered wheel, and the rubber covered wheel can be fixed by locking the fixing holes 241 and abutting against the bottom surface of the locking groove 221 or screwing the rubber covered wheel into the shaft 220. Both ends of the shaft 220 are used to mount the pre-pressing unit 230.

Referring to fig. 5 in combination with fig. 3, both ends of the shaft 220 are respectively installed in bearings of a bearing seat 300, so that the shaft 220 can freely rotate around its axis together with the pre-pressing unit 230 and the supporting unit 240 disposed thereon. This mounting manner can change the friction between the battery cell C and the supporting unit 240 into rolling friction, and reduce the friction of the supporting unit 240 against the battery cell C. The bearing housing 300 is fixedly connected with a guide rod 310 in a direction perpendicular to the shaft 220, and one end of the guide rod 310 may be installed in the bearing housing 300 by a screw, thereby achieving a fixed installation.

The base 210 is a flat plate, two ends of the base are respectively provided with a guide hole 211 in a penetrating manner, and a gasket 212 is installed inside the guide hole 211 or a step surface structure is arranged, so that the diameter of the guide hole 211 at the position is reduced. The guide rod 310 of the shaft 220 is inserted into the guide hole 211 after being sleeved with a spring 320, such that the spring 320 is located between the spacer 212 and the bearing block 300, and the shaft 220 can be elastically mounted on the base 210. When the shaft 220 is subjected to an external pressure, the spring 320 may be compressed to effect movement in a direction perpendicular to its axis; when the external force is removed, the shaft 220 can be restored to the original position under the action of the spring.

In order to keep the movement of the shaft 220 smooth, a linear bearing 213 is further provided in the guide hole 211. The guide bar 310 is inserted into the linear bearing 213 and its end is screwed with a washer to prevent slipping out of the linear bearing 213. In other embodiments, the linear bearing and the guide hole may be replaced by a damping slide rail or a common slide rail, and the guide rod 310 as a movable rail of the slide rail directly cooperates with a fixed rail disposed on the base 210, so as to achieve the function of stabilizing the movement of the shaft 220.

With reference to fig. 5, the main body of the base 210 of the present embodiment is further provided with a cutter base 400 for cooperating with the diaphragm cutter. The cutter base plate 400 is provided with a cutter groove 410 parallel to the shaft 220 for receiving a diaphragm cutter. The cutter base plate 280 is provided with a kidney-shaped hole 420 matched with the threaded hole, the cutter base plate 400 can be fixed on the base 210 through the kidney-shaped hole 420 and the corresponding threaded hole on the base 210, and the installation position of the cutter base plate 400 is adjusted through the kidney-shaped hole 420, so that the cutter groove 410 is aligned with the position of the diaphragm cutter. The kidney hole 420 may be set long enough to ensure that the edge of the cutter base 400 does not obstruct the movement of the pre-pressing unit 230 and the supporting unit 240 with the shaft 220. In this embodiment, two waist-shaped holes 420 are provided on the same side, and two cutter grooves 410 are provided, so that the position of the cutter base plate 400 relative to the base 210 can be fully adjusted.

Referring to fig. 1 to 5, in the turret mechanism 100 of the present embodiment, a tab pre-pressing device 200 is disposed corresponding to each winding pin set, and a shaft 220 of the tab pre-pressing device 200 is parallel to the corresponding winding pin set. When the winding needle group starts to wind the battery cell, the supporting unit 240 on the shaft 220 just compresses the battery cell C in winding, so as to prevent the battery cell from being scattered. Meanwhile, the pre-pressing surfaces 231 of the two pre-pressing units 230 are in contact with the tabs of the battery cell, one end of the pre-pressing surface 231 with a small cross section is in contact with the roots of the tabs, and the other end of the pre-pressing surface 231 with a large cross section is in contact with the free end of the tabs, so that the tabs can be ensured to bend along the inclination angle of the pre-pressing surfaces 231. As the diameter of the cell increases during winding, the support unit 240 applies an external pushing force to the shaft 220, and the shaft 220 further compresses the spring 320, thereby ensuring proper contact with the cell while sliding in the through hole 211 of the base 210 and accommodating the gradual increase of the cell. Therefore, the electrode lug of the battery cell can be shaped in the winding process.

As can be seen from the above description, in the present embodiment, the diameter of the rubber coating wheel is substantially equal to the diameter of the minimum position of the conical wheel, so that it can be ensured that the smaller cross-section end of the pre-pressing surface 231 in the conical wheel fits exactly to the root of the tab when the rubber coating wheel is supported on the battery cell.

The two pre-pressing units 230 are arranged in the above embodiment, but it is obvious that when the specification of the battery cell is that the tab is arranged on one side, the corresponding tab pre-pressing device may be only provided with one pre-pressing unit 230.

Fig. 6 shows another embodiment of the present invention, in which the winding pins are in the same direction and only one winding pin is provided. In this structure, the turret mechanism includes a circular turntable 150 and a set of winding pins 151 disposed on the turntable 150, the winding pins 151 can rotate around their axes and extend out of and retract back from the surface of the turntable 150, and all the processes of winding the battery cells are completed at the same station. Since there is no spindle structure for the tab preloading device to be mounted thereon, the base 210 of the tab preloading device may be directly or indirectly disposed on other parts of the winding machine, such as a large plate.

In this embodiment, the pre-pressing unit also has the function of the supporting unit. As shown in fig. 7, the generatrix of the tapered pre-pressing surface 511 of the pre-pressing unit 510 in this embodiment is formed by expanding outward along the axis of the cylindrical main body 512, so that when the tab is shaped, the cylindrical main body 512 of the pre-pressing unit can be supported on the cell C, the smaller cross-section end of the tapered pre-pressing surface 511 is aligned with the root of the tab, and the larger cross-section end is bent inward to form the free end of the tab. Similarly, the pre-pressing unit 510 may be designed in a split structure and fixed on the shaft 220 by screws, the shaft 220 may be rotatably assembled by the bearing housing 300 and mounted on the base 210 by the spring 320, and the specific structure may be implemented as in the previous embodiment, and will not be described again here. It should be noted that, in the present embodiment, a separate supporting unit may also be provided as needed.

Fig. 8 is a modification of the previously described embodiment on the basis of the inventive concept, which modification can equally be applied to the embodiment of fig. 1-5 and to the embodiment of fig. 6-7. In this modification, the shaft 220 'of the tab preloading device is fixedly mounted directly to a mounting base 300', and the shaft 220 'cannot rotate along its axis in the mounting base 300'. The support unit 240' is mounted to the shaft 220' by a bearing 241', i.e., the support unit 240' can rotate on the shaft 220 '.

In this modification, the pre-pressing unit 230 'in the previous embodiment is also fixedly mounted on the shaft 220', i.e. neither the pre-pressing unit 230 'nor the shaft 220' rotates. Since the pre-pressing unit 230 'does not need to rotate around the axis, the tab shaping can be realized by only having one pre-pressing surface facing the tab, i.e., the pre-pressing unit 230' can be implemented in the form of a pre-pressing sheet without using a cone wheel.

It can also be seen that in the pre-pressing unit 230' in the form of a pre-pressed tablet, two design options are available for the pre-pressing surface: one is the free end form of the pre-compression plate contacting the tab as shown in fig. 7 and the other is the free end form of the pre-compression plate contacting the tab root, in the second design form the free end of the pre-compression surface is extended towards the axial direction of the shaft 220'.

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 substitutions or changes made by the person skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the invention is subject to the claims.

Claims

1. A tab prepressing device is used for bending tabs of an electric core wound on a winding needle and comprises a shaft and a prepressing unit arranged on the shaft, wherein the shaft is arranged in parallel with the winding needle, the prepressing unit comprises a prepressing surface, and the prepressing surface is used for bending the tabs of the electric core; the battery is characterized in that the shaft is elastically installed on a base, a supporting unit is arranged on the shaft, and the supporting unit is used for supporting the battery cell and elastically compressing the shaft towards one side of the base.

2. The tab pre-pressing device according to claim 1, wherein two guide rods are provided on the shaft perpendicular to the axial direction thereof, a spring is respectively sleeved on the guide rods and respectively provided in a guide hole of the base, one end of the spring abuts against the shaft, and the other end abuts against the base.

3. The tab preloading device as claimed in claim 2, wherein a linear bearing is provided in the guide hole, and the free end of the guide bar is provided in the linear bearing.

4. The tab pre-pressing device according to claim 1, wherein two movable rails are arranged on the shaft perpendicular to the axis thereof, two fixed rails are arranged on the base, and the two movable rails and the two fixed rails cooperate to form a two-rail structure; the sliding rail structures are respectively provided with a spring which is arranged between the shaft and the base.

5. The tab preloading device as claimed in claim 1, wherein both ends of said shaft are rotatably provided on said base along the axis thereof; the prepressing unit and the supporting unit are respectively and fixedly arranged on the shaft, and the prepressing surface of the prepressing unit is realized by adopting a conical surface.

6. The tab preloading device as claimed in claim 5, wherein the conical surface has a large cross-sectional end and a small cross-sectional end, wherein the small cross-sectional end is disposed opposite to the supporting unit, and the small cross-sectional end has a diameter equal to that of the supporting unit.

7. The tab prepressing device according to claim 5, wherein the prepressing unit comprises a cylindrical main body having a cross-sectional diameter equal to that of the smaller end of the prepressing surface, the cylindrical main body is supported on the cell sidewall, and the smaller end of the prepressing surface contacts the root of the tab.

8. The tab pre-pressing device as claimed in claim 1, wherein both ends of the shaft are fixedly disposed on the base; the supporting unit is rotatably arranged on the shaft, the pre-pressing unit is fixed on the shaft and is provided with a pre-pressing surface bent towards the pole lug.

9. A turret mechanism comprises a main turret and an auxiliary turret which are oppositely arranged, wherein a main shaft is fixedly connected between the main turret and the auxiliary turret, and the main turret and the auxiliary turret are respectively provided with a plurality of groups of winding needles; the pole lug prepressing device is characterized by further comprising a plurality of groups of pole lug prepressing devices according to claim 1, wherein a base of each pole lug prepressing device is fixedly arranged on the main shaft, and a shaft of each pole lug prepressing device is parallel to the winding needle.

10. A turret mechanism comprises a circular turntable and a winding needle arranged at the center of the turntable, wherein the winding needle can rotate around the axis of the winding needle and extends out of and retracts back from the surface of the turntable; the tab pre-pressing device is characterized by further comprising a group of tab pre-pressing devices according to claim 1, wherein the tab pre-pressing devices are installed on one side of the winding needle, and a shaft of each tab pre-pressing device is parallel to the winding needle.