CN213150811U

CN213150811U - Rolling device, pole piece rolling equipment and lithium battery production line

Info

Publication number: CN213150811U
Application number: CN202022037279.4U
Authority: CN
Inventors: 刘超; 吴志亮; 贺梦江; 张耀
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2021-05-07
Anticipated expiration: 2030-09-17

Abstract

The utility model discloses a rolling device, pole piece roll-in equipment and lithium cell production line. The rolling device comprises: the bending part comprises a plurality of bending rollers and a plurality of supporting rollers, and the bending rollers and the supporting rollers are arranged in a staggered mode; and the inlet tension roller and the outlet tension roller are used for winding and tensioning the pole piece and enabling the pole piece to continuously pass through the bending roller group and the supporting roller group. The pole piece rolling equipment comprises the rolling device. The lithium battery production line comprises the pole piece rolling equipment. The utility model discloses carry out the bending deformation processing repeatedly to the pole piece substrate to less power realizes the correction to the pole piece substrate, makes each part of pole piece warp and tends to the unanimity, reduces the production on arc height and wave limit, and required tension when can reducing tensile moreover improves the condition that the disconnected area of pole piece substrate roll-in.

Description

Rolling device, pole piece rolling equipment and lithium battery production line

Technical Field

The utility model belongs to the technical field of power battery and specifically relates to a rolling device, pole piece roll-in equipment and lithium cell production line are related to.

Background

In the field of power batteries, reducing the thickness of a base material is one of effective schemes for improving the energy density of a lithium ion battery, but the thinner the base material is, the higher the risk of belt breakage caused by rolling is, and meanwhile, the larger the deformation difference of different positions of the base material is, the more easily the arc height and the wavy edge are generated. In the related art, the camber and the wavy edge are generally improved by increasing the flattening tension, and the broken belt is generally improved by reducing the flattening tension, which are contradictory and difficult to be considered.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a rolling device can reduce the production of arc height and wave limit when improving the disconnected area condition of substrate roll-in.

The utility model also provides a pole piece roll-in equipment that contains above-mentioned roll-in device.

The utility model also provides a lithium battery production line who contains above-mentioned pole piece roll-in equipment.

The utility model discloses a roll-in device that first aspect embodiment provided, include: the bending part comprises a bending roller group and a supporting roller group, the bending roller group comprises at least two bending rollers, the supporting roller group comprises at least two supporting rollers, and the bending rollers and the supporting rollers are arranged in a staggered mode; and the stretching part comprises an inlet tension roller and an outlet tension roller, the inlet tension roller and the outlet tension roller are respectively positioned at two ends of the bending part, and the inlet tension roller and the outlet tension roller are used for winding and tensioning the pole pieces and enabling the pole pieces to continuously pass through the bending roller group and the supporting roller group.

The utility model discloses the roll-in device that the embodiment of the first aspect provided has following beneficial effect at least: the rolling device is used for stretching, repeatedly bending and stretching the pole piece base material, wherein the pole piece base material is repeatedly bent and deformed, so that the pole piece base material can be corrected with small force, all parts of the pole piece are deformed to be consistent, the generation of arc height and wavy edges is reduced, the tension required in stretching can be reduced, and the condition that the pole piece base material is broken when being rolled is improved.

In some embodiments of the utility model, still include the exhibition flat portion, the exhibition flat portion includes the exhibition flat roller, the exhibition flat roller with the bending roll the backing roll the entry tension roll export at least one opposition in the tension roll in order to form the exhibition flat area, the exhibition flat area can supply the pole piece passes.

In some embodiments of the present invention, the flattening portion further includes a pressing roller, the pressing roller and the flattening roller are oppositely disposed to form a flattening area, and the flattening area can supply the pole piece to pass through.

In some embodiments of the present invention, the nip roll has a pattern.

In some embodiments of the present invention, the nip roll is a curved roll.

In some embodiments of the present invention, the rolling device further comprises a driving device, and the driving device is connected with the bending roller set or the supporting roller set to drive the bending roller set and the supporting roller set to move relatively.

In some embodiments of the present invention, the rolling device further comprises a heating device connected to the stretching part and/or the bending part.

The utility model discloses the embodiment of the second aspect provides a pole piece roll-in equipment, include: rolling; the rolling means in the above first aspect embodiment is located in front and/or rear of the roll.

The utility model discloses the pole piece roll-in equipment that the embodiment of second aspect provided has following beneficial effect at least: the rolling device in the embodiment is arranged in the pole piece rolling equipment, the pole piece base material is repeatedly bent and deformed, the pole piece base material can be corrected by small force, all parts of the pole piece are deformed to be consistent, the generation of arc height and wavy edges is reduced, tension required in stretching can be reduced, the condition that the pole piece base material is broken in rolling is improved, and the pole piece rolling efficiency is improved.

In some embodiments of the present invention, the pole piece rolling device further comprises a roller, wherein the roller is located at the front part and/or the rear part of the roller.

The utility model discloses lithium cell production line that third aspect embodiment provided, pole piece roll-in equipment in the embodiment of above-mentioned second aspect.

The utility model discloses lithium cell production line that third aspect embodiment provided has following beneficial effect at least: the pole piece rolling equipment in the embodiment is used in the lithium battery production line, so that broken belts can be reduced, a relatively flat pole piece can be manufactured, and the production efficiency can be improved while the product quality is ensured.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic view of a rolling device according to some embodiments provided by the first aspect of the present invention;

fig. 2 is a schematic view of a rolling device according to another embodiment of the first aspect of the present invention;

fig. 3 is a schematic view of a rolling device according to another embodiment of the first aspect of the present invention;

fig. 4 is a schematic view of how the splayed lines of the nip roll of the roll press apparatus according to some embodiments of the first aspect of the present invention are formed;

fig. 5 is a schematic view of the transverse striations of the nip roll of the rolling device according to some embodiments of the present invention;

fig. 6 is a schematic view of a pole piece rolling device according to some embodiments provided by the second aspect of the present invention

Reference numerals:

the device comprises a bending part 100, a bending roller 110, a support roller 120, a stretching part 200, an inlet tension roller 210, an outlet tension roller 220, a flattening part 300, a flattening roller 310, a flattening area 320, a laminating roller 330, a rolling roller 400, a passing roller 500 and a pole piece 600.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "fixed," and "disposed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The utility model discloses a roll-in device that first aspect embodiment provided, include: the bending device comprises a bending part 100, wherein the bending part 100 comprises a bending roller group and a supporting roller group, the bending roller group comprises at least two bending rollers 110, the supporting roller group comprises at least two supporting rollers 120, and the bending rollers 110 and the supporting rollers 120 are arranged in a staggered mode; and the stretching part 200, wherein the stretching part 200 comprises an inlet tension roller 210 and an outlet tension roller 220, the inlet tension roller 210 and the outlet tension roller 220 are respectively positioned at two ends of the bending part 100, and the inlet tension roller 210 and the outlet tension roller 220 are used for winding and tensioning the pole piece 600 and enabling the pole piece 600 to continuously pass through between the bending roller group and the support roller group.

For example, as shown in fig. 1, the bending portion 100 includes a bending roller group including three bending rollers 110 and a support roller group including three support rollers 120, the bending rollers 110 being disposed above the support rollers 120, the two being staggered; the stretching part 200 includes two inlet tension rollers 210 and two outlet tension rollers 220, and the inlet tension rollers 210 are symmetrically disposed with the outlet tension rollers 220. The pole piece 600 enters the rolling device along the direction A, firstly S-shaped bypasses the inlet tension roller 210 for stretching deformation, then passes through the bending part 100, passes through the space between the bending roller group and the supporting roller group for repeated bending deformation, and then S-shaped bypasses the outlet tension roller 220 for stretching deformation again.

When the pole piece 600 passes through the bending part 100, the part contacting with the bending roller 110 and the supporting roller 120 receives a force perpendicular to the direction of the pole piece 600, so that the pole piece 600 bends and extends, and the deformation trend of each part of the pole piece 600 is consistent. The force required by the pole piece 600 to bend and deform and perpendicular to the pole piece 600 is far smaller than the force required by the pole piece 600 to be stretched in parallel, and the pole piece 600 is subjected to bending deformation treatment, so that the shape of the pole piece 600 can be corrected, the tension applied to the pole piece 600 can be reduced, and the occurrence of belt breakage can be reduced. The plurality of bending rollers 110 and the supporting rollers 120 are arranged, so that the pole piece 600 is repeatedly bent and deformed, the single bending deformation and the input tension can be reduced, the shape of the pole piece 600 is gradually improved in a small quantity and a plurality of times, the tension borne by the pole piece 600 is further reduced, and the occurrence of the broken belt condition is reduced. After the bending deformation, the stretching deformation is performed again, so that the residual curvature of the pole piece 600 after passing through the bending part 100 can be eliminated, and the correction effect of the pole piece 600 is better.

It is understood that the roll diameters of the inlet tension roll 210 and the outlet tension roll 220 are not limited, but are generally selected to be larger, and the larger roll diameter can increase the wrap angle, increase the tension transmission coefficient, help to lower the tension set value, and prevent the belt breakage caused by the excessive tension. The number of the bending rollers 110 and the supporting rollers 120 can be 2, 3, 4 or more, and the more the number of the bending rollers 110 and the supporting rollers 120 is, the more the times of bending deformation of the pole piece 600 is, the more the amount of single bending deformation and the input tension can be reduced, and the occurrence of belt breakage can be reduced. The roll diameters of the bending roll 110 and the supporting roll 120 are not limited, but an excessively small roll diameter may cause an excessively large tension to the pole piece 600, increasing the risk of belt breakage, and therefore, an excessively small roll diameter should be avoided to reduce the occurrence of belt breakage.

The bending roller 110 may have a pattern, for example, the bending roller 110 may have a cross-grain, a vertical grain, a lentil grain, a splayed grain, etc. Different patterns can provide different friction, the splayed pattern can provide longitudinal friction and transverse friction, the pole piece 600 can be transversely flattened and longitudinally extended, and the phenomenon that the pole piece 600 is wrinkled is reduced; the longitudinal friction force can be increased by the aid of patterns such as transverse lines, vertical lines and lentils, strain of the pole piece 600 can be strengthened, crack expansion difficulty is increased, and the purpose of reducing belt breakage is achieved.

It is understood that the pattern depth of the bending roller 110 is not limited, but that an excessively deep friction pattern should be avoided in order to avoid the occurrence of belt breakage due to excessive force applied to the pole piece 600 due to excessive friction. In order to prevent the pole piece 600 from being scratched by the burr of the friction pattern, the surface of the bending roller 110 may be polished to remove the surface burr. In order to improve the wear resistance of the surface of the bending roller 110, the bending roller 110 may be subjected to a surface hardening treatment including surface quenching, nitriding, carburizing, thermal spraying, and the like.

In some embodiments of the present invention, the rolling device further includes a flattening portion 300, the flattening portion 300 includes a flattening roller 310, the flattening roller 310 is opposed to at least one of the bending roller 110, the supporting roller 120, the inlet tension roller 210, and the outlet tension roller 220 to form a flattening area 320, and the flattening area 320 can be passed by the pole piece 600.

For example, as shown in fig. 2, the flattening section 300 includes a flattening roller 310, the pole piece 600 winds from the lower portion of the inlet tension roller 210 to the upper portion of the flattening roller 310 and then to the lower portion of the first bending roller 110, and the flattening zones 320 are respectively formed between the inlet tension roller 210 and the flattening roller 310 and between the flattening roller 310 and the bending roller 110. The pole piece 600 stretches under tension in the flattening area 320, so that the flattening effect is achieved, and the occurrence of belt breakage is reduced.

It is understood that the flattening section 300 may be disposed between the inlet tension roller 210 and the bending section 100, and may also be disposed between the bending section 100 and the outlet tension roller 220. The roll diameter of the flattening roll 310 is not limited, but too small roll diameter may cause too large tension on the pole piece 600, increasing the risk of belt breakage, so that too small roll diameter should be avoided to reduce the occurrence of belt breakage.

In some embodiments of the present invention, the flattening portion 300 further includes a pressing roller 330, the pressing roller 330 is opposite to the flattening roller 310 to form a flattening area 320, and the flattening area 320 can be passed by the pole piece 600.

For example, as shown in fig. 3, the flattening section 300 includes a flattening roller 310 and a nip roller 330, the nip roller 330 is disposed to alternate with the two flattening rollers 310 to form a flattening zone 320, and the pole piece 600 passes through the flattening zone 320 between the flattening roller 310 and the nip roller 330 after passing out of the inlet tension roller 210, and then enters the bending section 100. The stitching roller 330 and the flattening roller 310 are opposite to form a flattening area 320, and the pole piece 600 stretches in the flattening area 320 under the action of tension, so that the flattening effect is achieved, and the occurrence of belt breakage is reduced.

It is to be understood that the number of the nip rollers 330 is not limited and may be set according to actual circumstances. The diameter of the stitching roller 330 is not limited, but too small diameter will cause too large tension on the pole piece 600 and increase the risk of belt breakage, so that too small diameter should be avoided to reduce the occurrence of belt breakage.

In some embodiments of the present invention, the nip roll 310 has a pattern.

Patterns are added on the surface of the flattening roller 310, so that the friction force of the flattening roller 310 to the pole piece 600 can be increased, the tension set value is reduced, and the belt breakage is reduced.

It is understood that the number of the nip rollers 310 may be any number, and different patterns may be provided on different nip rollers 310, so that the nip portion 300 can simultaneously realize functions of different patterns. The pattern depth of the nip roll 310 is not limited, but an excessively deep pattern should be avoided in order to avoid the occurrence of belt breakage due to excessive force applied to the pole piece 600 caused by excessive friction. In order to prevent pole piece 600 from being scratched by patterned burrs, the surface of nip roll 310 may be polished to remove surface burrs. In order to improve the wear resistance of the surface of the nip roll 310, the nip roll 310 may be subjected to a surface hardening treatment including surface quenching, nitriding, carburizing, thermal spraying, and the like.

For example, the pattern may be a chevron or a cross-bar. As shown in fig. 3, the nip 200 includes two nip rolls 310. One flattening roller 310 has splayed lines as shown in fig. 4, can provide longitudinal friction and transverse friction, can transversely flatten and longitudinally extend pole piece 600, and reduces the phenomenon that pole piece 600 crumples. The other flattening roll 310 has transverse stripes as shown in fig. 5, so that longitudinal friction force can be increased, strain of the pole piece 600 can be strengthened, crack propagation difficulty is increased, and belt breakage is reduced.

It can be understood that the inclination angle of the splayed grains, the width between the adjacent grains and the like are not limited, and the width between the adjacent grains of the transverse grains and the like are not limited and can be set according to actual conditions. The transverse lines can be replaced by vertical lines, lentil lines and the like, so that the longitudinal friction force can be increased, the strain of the pole piece 600 is strengthened, the crack propagation difficulty is increased, and the occurrence of belt breakage is reduced.

In some embodiments of the present invention, the nip roll 310 is a curved roll.

The arc-shaped roller is used for generating an arc shape by applying external force at two ends of a roller shaft. The arc roller can generate a force perpendicular to the arc in the circumferential direction, longitudinal friction and transverse friction can be applied to the pole piece 600, the pole piece 600 can be transversely flattened and longitudinally extended, and the phenomenon that the pole piece 600 is wrinkled is reduced.

It can be understood that the radian of the arc-shaped roller can be adjusted through external force at two ends of the adjusting roller shaft, and can be adjusted according to actual conditions. The roll diameter of the arc roll is not limited, but too small roll diameter can cause too large tension on the pole piece 600, increasing the risk of belt breakage, so that the situation of belt breakage caused by too small roll diameter is avoided.

In some embodiments of the utility model, the roll-in device still includes drive arrangement, and drive arrangement is connected with crooked roller set or support roller set to drive crooked roller set and support roller set relative movement.

For example, as shown in fig. 1 to 3, in the bending portion 100, the upper portion is a bending roller 110, and the lower portion is a support roller 120. The driving device is arranged on the bending roller 110, the driving device can enable the bending roller 110 to move in the vertical direction, and the force borne by the pole piece 600 in the vertical direction can be adjusted by adjusting the pressing amount of the bending roller 110 according to actual conditions, so that the bending part 100 can generate a better bending deformation effect on the pole piece 600.

It is understood that the driving device may be disposed on the support roller 120, and the bending roller 110 and the support roller 120 may be relatively moved. The driving means may be a cylinder or a bolt.

In some embodiments of the present invention, a heating device is disposed on at least one of the bending portion 100 and the stretching portion 200, and the heating device is used for heating the pole piece 600.

For example, as shown in fig. 1 to fig. 3, in the bending portion 100, the supporting roller 120 is provided with a heating device, which can heat the pole piece 600, so that the pole piece 600 is more easily deformed, which is helpful for reducing the tension applied to the pole piece 600, so that the pole piece 600 is subjected to a smaller force, which can reduce the wavy edge and the arc height, and reduce the occurrence of tape breakage.

It is understood that the heating device may be disposed on the support roller 120 of the bending portion 100, on the bending roller 110, on the stretching portion 200, or both; may be provided on one of the rolls or may be provided on a plurality of rolls. The heating device may be a resistance heating device, an electromagnetic heating device, or a hydraulic oil heating device.

The utility model discloses the embodiment of the second aspect provides a pole piece roll-in equipment, include: a roll 400; the rolling means in any of the first aspect embodiments described above may be located in front of and/or behind the roll 400.

In some embodiments of the present invention, the pole piece rolling device further comprises a roller, and the roller 500 is located at the front and/or rear of the roller 400.

For example, as shown in fig. 6, the front portion and the rear portion of the roll 400 are both provided with the roller 500 and the rolling device provided in the embodiment of the first aspect of the present invention, the pole piece 600 enters the pole piece rolling device along the a direction, the rolling device at the front portion enters the roll 400 through the roller 500 at the front portion after the stretching and bending correction for the rolling reduction, and the roller 500 at the rear portion enters the rolling device at the rear portion for the stretching and bending correction. The front portion and the rear portion of roll 400 all are provided with the utility model discloses the roll-in device that the embodiment of the first aspect provided can get into before roll 400 is rolling and correct pole piece 600's shape after rolling pole piece 600, reduces the production of wavy limit and camber and reduces the disconnected area condition and take place. The roller 500 can guide the pole piece 600, the roller 500 at the front can guide the pole piece 600 between the rolling rollers 400, and the roller 500 at the rear can guide the pole piece 600 into the rolling device.

It can be understood that the utility model discloses the roll-in device that the embodiment of the first aspect provided can set up simultaneously at the front portion and the rear portion of roll 400, also can set up alone at the front portion or the rear portion of roll 400, all can realize rectifying pole piece 600 shape, reduces rippled edge and camber and reduces the effect that the disconnected area condition takes place. Meanwhile, the shape of the pole piece 600 can be corrected before rolling the pole piece 600, the uneven pole piece 600 can be prevented from entering the roller 400, the uneven part is strengthened due to rolling, the shape of the pole piece 600 can be corrected again after rolling the pole piece 600, the pole piece 600 can be rolled smoothly, the shape of the pole piece 600 can be improved better, the generation of wavy edges and arc height can be reduced, and the occurrence of belt breakage can be reduced. The utility model discloses pole piece roll-in equipment that the embodiment of second aspect provided can include the utility model discloses the arbitrary roll-in device that the embodiment of first aspect provided.

The pole piece rolling equipment in the embodiment is used in the lithium battery production line, so that broken belts can be reduced, a relatively flat pole piece can be manufactured, and the production efficiency can be improved while the product quality is ensured.

It can be understood that the utility model discloses the lithium cell production line that the third aspect embodiment provided can include the utility model discloses arbitrary pole piece roll-in equipment that the second aspect embodiment provided.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims

1. Roll-in device for roll-in pole piece, its characterized in that includes:

the bending part comprises a bending roller group and a supporting roller group, the bending roller group comprises at least two bending rollers, the supporting roller group comprises at least two supporting rollers, and the bending rollers and the supporting rollers are arranged in a staggered mode;

and the stretching part comprises an inlet tension roller and an outlet tension roller, the inlet tension roller and the outlet tension roller are respectively positioned at two ends of the bending part, and the inlet tension roller and the outlet tension roller are used for winding and tensioning the pole pieces and enabling the pole pieces to continuously pass through the bending roller group and the supporting roller group.

2. The rolling device according to claim 1, further comprising a flattening section including a flattening roller opposed to at least one of the bending roller, the support roller, the inlet tension roller, and the outlet tension roller to form a flattening zone through which the pole piece can pass.

3. The rolling device according to claim 2, wherein the flattening portion further comprises a nip roller, the nip roller forming a flattening zone opposite to the flattening roller, the flattening zone being capable of passing through the pole piece.

4. Roll device according to claim 2 or 3, characterised in that the flattening rolls have a pattern.

5. A roller device according to claim 2 or 3, characterized in that the flattening rollers are curved rollers.

6. The roller device according to claim 1, further comprising a driving device connected to the bending roller set or the support roller set to drive the relative movement of the bending roller set and the support roller set.

7. The rolling device according to claim 1, further comprising a heating device connected to the stretching portion and/or the bending portion.

8. Pole piece roll-in equipment, its characterized in that includes:

rolling;

the rolling device according to any one of claims 1 to 7, which is located in front and/or rear of the roll.

9. The pole piece rolling apparatus of claim 8, further comprising a roller in front and/or rear of the roller.

10. A lithium battery production line, characterized by comprising a pole piece rolling device according to claim 8 or 9.