CN114248484A

CN114248484A - Pole piece rolling machine and pole piece rolling method

Info

Publication number: CN114248484A
Application number: CN202111594058.XA
Authority: CN
Inventors: 陈哲; 吴玉林
Original assignee: Huizhou Yinghe Technology Co Ltd
Current assignee: Huizhou Yinghe Technology Co Ltd
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-03-29

Abstract

The invention discloses a pole piece rolling machine and a pole piece rolling method. The pole piece rolling machine comprises a first supporting roller, a second supporting roller, a first roller and a second roller; the first supporting roller and the second supporting roller are arranged oppositely; the first roller and the second roller are arranged oppositely and are arranged between the first supporting roller and the second supporting roller; the first supporting roller and the second supporting roller can be close to each other and respectively support the first roller and the second roller to be close to each other for rolling; and the first roller and the second roller can generate roller bending action opposite to the rolling direction. The roller of the pole piece roller press is not easy to generate large deflection deformation when being subjected to roller bending force, so that the stress of the roller is effectively improved, and the rolling precision is improved. The pole piece rolling method adopts the pole piece rolling machine for rolling, and the produced pole piece has high rolling thickness uniformity and high production efficiency.

Description

Pole piece rolling machine and pole piece rolling method

Technical Field

The invention relates to the technical field of lithium battery pole piece rolling equipment, in particular to a pole piece rolling machine and a pole piece rolling method.

Background

The lithium battery has the advantages of stable charge and discharge, strong cruising ability and the like, and has increasingly wide application in the fields of vehicles, aviation, electronic products and the like, thereby increasing the demand of the lithium battery. With the rapid development of lithium battery technology, higher and higher requirements are provided for the thickness uniformity of the lithium battery pole piece.

However, the thickness of the lithium battery pole piece is required to be continuously thinned, and meanwhile, unprecedented new high requirements are also provided for the rolling process and equipment of the lithium battery pole piece. In the rolling process of the lithium battery pole piece, the phenomena of thick middle and thin two sides can be inevitably caused no matter in the positive electrode or the negative electrode, so that the pole piece with uneven thickness can greatly influence the use of the lithium battery pole piece, and the defects of short circuit and the like are easily caused. The method for solving the uneven thickness through transmission is that the roller bending mechanism is adopted on the rolling equipment to change the axial convexity of the roller so as to improve the uniformity of the thickness difference of the pole piece in the width direction.

However, the roller bending mechanism arranged on the traditional rolling equipment is simple in structure, the roller bending force is usually directly and simply applied to the roller, so that the roller and the bearing are unreasonably stressed, and especially when the roller diameter of the roller is large, the cylinder bending force cannot well obtain the required roller convexity. In addition, in the rolling process of the existing rolling equipment, because the rolling force and the roll bending force are directly acted on the same roll, the force action is unreasonable, the roll is easy to generate larger deflection deformation at the roll neck, the roll diameter at the roll rolling position cannot obtain the required roll convexity, and the rotation precision of a rolling mill bearing can be influenced due to the deflection deformation at the roll diameter, so that the rolling precision of the rolling machine is reduced.

Disclosure of Invention

The invention provides a pole piece rolling machine, aiming at solving the problems that the rolling precision is low and new production requirements cannot be met due to the fact that the roll bending effect and the roll stress are unreasonable and the ideal roll convexity cannot be formed in the existing rolling machine.

The invention also aims to provide a pole piece rolling method, which adopts the pole piece rolling machine to roll the lithium battery pole piece, so that the rolled pole piece has high thickness uniformity.

The purpose of the invention is realized by the following technical scheme.

A pole piece roller press comprising:

the supporting device comprises a first supporting roller and a second supporting roller, wherein the first supporting roller and the second supporting roller are arranged oppositely;

the first roller and the second roller are arranged oppositely and are arranged between the first supporting roller and the second supporting roller;

the first supporting roller and the second supporting roller can approach each other under the driving of the rolling driving piece; when the first supporting roller and the second supporting roller are close to each other, the first supporting roller and the second supporting roller can respectively support the first roller and the second roller to be close to each other for rolling;

the first roller and the second roller can generate roller bending action under the driving of the roller bending driving part, and the direction of the roller bending is opposite to the rolling direction.

In a preferred embodiment, the first supporting roller is abutted against the first rolling roller and can be driven by the first rolling roller to rotate synchronously; and/or the second support roller is abutted against the second roller and can be driven by the second roller to rotate synchronously.

In a preferred embodiment, the second support roller is relatively fixedly arranged, the rolling driving member is arranged on one side of the first support roller, which is far away from the second support roller, and the rolling driving member can drive the first support roller to be close to the second support roller.

In a more preferred embodiment, the rolling driving members include two rolling driving members, the two rolling driving members are respectively arranged corresponding to the two ends of the first supporting roller, and can perform a transmission action on the two ends of the first supporting roller.

In a further preferred embodiment, both ends of the first supporting roller are respectively and freely rotatably arranged on two supporting roller bearing seats; the two rolling driving pieces are respectively arranged corresponding to the two supporting roller bearing seats and can directly drive the supporting roller bearing seats.

In a preferred embodiment, the roll bending drives comprise a first roll bending drive and a second roll bending drive; the first roller bending driving part and the second roller bending driving part are respectively in action connection with the first roller and the second roller.

In a more preferred embodiment, the first roll bending driving parts comprise two first roll bending driving parts, and the two first roll bending driving parts are respectively arranged corresponding to the two ends of the first roll and can drive the two ends of the first roll.

In a more preferred embodiment, the second roll bending driving parts include two second roll bending driving parts, and the two second roll bending driving parts are respectively arranged corresponding to the two ends of the second roll and can drive the two ends of the second roll.

In a preferred embodiment, the first support roller, the second support roller, the first rolling roller, the second rolling roller, the rolling drive member, and the bending drive member are all disposed on a frame.

In a preferred embodiment, the roll drive is a ram; and/or the roller driving piece is an oil cylinder.

In a preferred embodiment, in the pole piece rolling machine, the first rolling roller and the second rolling roller are both small-diameter rollers, and the diameter of each roller is smaller than that of the first supporting roller and that of the second supporting roller.

In a more preferred embodiment, the first and second rolling rolls have a roll diameter of 100 to 300mm, and the first and second support rolls have a roll diameter of 400 to 600 mm.

A pole piece rolling method adopts the pole piece rolling machine to roll, and comprises the following steps:

s1, unwinding the pole piece to pass through a gap between the first roller and the second roller;

s2, driving the first roller and the second roller to rotate, starting the rolling driving piece, and driving the first supporting roller to press down the first roller by the rolling driving piece; the first roller presses down and tightly clings to the pole piece, and is matched with the second roller to roll the pole piece;

s3, if the rolled pole piece has uneven thickness along the width direction, entering S4; otherwise, go directly to S5;

s4, starting the bending roller driving piece, driving the first roller and the second roller to generate bending roller convexity with opposite rolling directions by the bending roller driving piece, and continuing rolling the pole piece;

and S5, finishing rolling the pole piece, and rolling the rolled pole piece.

Compared with the prior art, the invention has the following advantages and beneficial effects:

the pole piece rolling machine is provided with two opposite rollers and two opposite supporting rollers, wherein the rollers are arranged between the two supporting rollers, and the supporting rollers are driven by the rolling driving parts to support the rollers and form rolling force, so that the rollers are not easy to generate large deflection deformation when receiving the bending force, the rolling thickness between the rollers is ensured to be uniform, and the arranged rollers can be small-diameter rollers.

And moreover, the bending roller driving part is arranged, the bending roller driving part can perform a bending roller effect on each corresponding roller, the roller to be bent of each roller is accurately supplemented, the influence of the bending roller force on the roller with the large roller diameter, which cannot reach the required roller convexity, is improved, and the problems of abnormal sound and poor rolling precision caused by unreasonable stress of the roller and the bearing due to unreasonable structure are solved. Meanwhile, the roller with the small roller diameter can be set based on the roller, so that the cost of the roller press is reduced, the time required for roller change during rolling production is reduced, and the rolling production efficiency is effectively improved.

The pole piece rolling method adopts the pole piece rolling machine for rolling, when the pole piece is rolled to have uneven thickness in the width direction, the roll bending part of the roller to be bent can be supplemented through the roll bending driving piece, the rolling precision is improved, the produced pole piece is ensured to have high rolling thickness uniformity, the rolling production cost is low, and the production efficiency is high.

Drawings

FIG. 1 is a schematic front view of a pole piece roll press according to an embodiment of the present invention;

FIG. 2 is a schematic side view of a pole piece roll press according to an embodiment of the present invention;

FIG. 3 is a flow chart of a pole piece rolling method of the present invention in an embodiment;

the attached drawings are marked as follows: 1-a rack, 2-a first support roller, 3-a second support roller, 4-a first roller, 5-a second roller, 6-a support roller bearing seat, 7-a rolling driving part, 8-a bending roller driving part, 81-a first bending roller driving part and 82-a second bending roller driving part.

Detailed Description

The technical solutions of the present invention are further described in detail below with reference to specific examples and drawings, but the scope and implementation of the present invention are not limited thereto.

In the description of the specific embodiments, it should be noted that the terms "upper", "lower", "left", "right", "bottom", "top", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships where the products of the invention are conventionally placed when used, and the terms "first", "second", and the like are used for convenience of distinction and are only used for convenience of description and simplification of description, but do not indicate or imply that the structures or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore are not to be construed as limiting the invention and are not intended to indicate or imply relative importance.

Unless expressly stated or limited otherwise, the terms "mounted," "disposed," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate. In addition, as used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example one

Referring to fig. 1 and 2, the pole piece rolling machine of the present invention includes four rolls, namely a first support roll 2, a second support roll 3, a first roll 4 and a second roll 5. The first support roller 2, the second support roller 3, the first rolling roller 4 and the second rolling roller 5 are all arranged on the frame 1 and can freely rotate. As shown in the illustrated embodiment, the first support roller 2 and the second support roller 3 are both freely rotatably provided on the frame 1 through support roller housings 6, the power for free rotation may be provided by an external power source, and further alternatively, the respective power source may be a motor or the like and may be provided on the frame 1.

Specifically, first backup roll 2 is parallel to each other with second backup roll 3, and first backup roll 2 is the relative setting of upper and lower distribution with second backup roll 3, and first backup roll 2 with have the interval between the second backup roll 3, can take place mutual removal between first backup roll 2 and the second backup roll 3 and be close to or keep away from. Optionally, a guide rail for the support roller bearing seat 6 to slide may be disposed on the frame 1, the support roller bearing seat 6 for mounting the first support roller 2 and/or the second support roller 3 on the frame 1 may be configured to slide up and down on the frame 1 to drive the first support roller 2 and/or the second support roller 3 to slide up and down synchronously, or the first support roller 2 and/or the second support roller 3 may be driven by an external driving force to move up and down on the frame 1, so as to achieve up and down movement of the first support roller 2 and the second support roller 3 on the frame 1, and further achieve mutual movement between the first support roller 2 and the second support roller 3 to approach or keep away.

Similarly, the first roller 4 and the second roller 5 are arranged in parallel, the first roller 4 and the second roller 5 are both arranged between the first supporting roller 2 and the second supporting roller 3, and the first roller 4 and the second roller 5 are also arranged oppositely and distributed up and down and can move to be close to or far away from each other. Optionally, a guide rail for a roll chock to slide may be disposed on the frame 1, and the roll chock, in which the first roll 4 and/or the second roll 5 are mounted, may be configured to slide up and down on the frame 1 to drive the first roll 4 and/or the second roll 5 to slide up and down synchronously, or the first roll 4 and/or the second roll 5 may be driven by an external driving force to move up and down on the frame 1, so as to achieve up and down movement of the first roll 4 and the second roll 5 on the frame 1, and further achieve mutual moving close contact or mutual distance between the first roll 4 and the second roll 5.

The first roller 4 and the second roller 5 are not in close contact with each other, but have a gap, and the gap between the first roller 4 and the second roller 5 is a rolling working position. During rolling operation, the lithium battery pole piece is unreeled from a gap between the first roller 4 and the second roller 5 and moves through the gap, the first roller 4 and the second roller 5 which are close to each other and tightly attached to each other are clamped from the upper side and the lower side, and the lithium battery pole piece can be rolled in the rotating and rolling process of the first roller 4 and the second roller 5, so that the lithium battery pole piece can obtain uniform thickness.

Specifically, during the work of the pole piece rolling machine, in the process that the first supporting roller 2 and the second supporting roller 3 are driven by an external power source to approach each other, the first supporting roller 2 and the second supporting roller 3 can respectively support the first roller 4 and the second roller 5 correspondingly, the first roller 4 and the second roller 5 are driven to approach each other, the first supporting roller 2 and the second supporting roller 3 provide rolling force for the rolling of the first roller 4 and the second roller 5, and the first roller 4 and the second roller 5 which are close to each other can roll pole pieces passing through gaps therein.

During the rolling process, the first supporting roll 2 is rotated in synchronization with the first rolling roll 4, and the second supporting roll 3 is rotated in synchronization with the second rolling roll 5. The rotation of the first supporting roller 2 and the second supporting roller 3 can be driven by external power to rotate or can be driven to rotate without power. In the specific preferred embodiment shown in fig. 1 and fig. 2, when the first supporting roller 2 is driven to move downwards to support the first rolling roller 4, the roller surface of the first supporting roller 2 and the roller surface of the first rolling roller 4 are abutted against each other, and when the first rolling roller 4 rotates in a rolling manner, the first supporting roller 2 can be driven by the first rolling roller 4 through friction force to rotate synchronously; and in the fixing and supporting action of the second supporting roller 3 on the second roller 5, the roller surface of the second supporting roller 3 is upwards abutted against the roller surface of the second roller 5, and when the second roller 5 rotates in a rolling way, the second supporting roller 3 can be driven by the second roller 5 through friction force to rotate synchronously.

In the particularly preferred embodiment shown in fig. 1 and 2, the first support roller 2 and the second support roller 3 are arranged to be moved closer to each other on the frame 1 by an external power. Specifically, the first support roller 2 and the second support roller 3 are driven to approach each other by the rolling driving member 7, and the rolling driving member 7 is selected from, but not limited to, an oil cylinder, and the rolling driving member 7 is disposed on the rack 1. Wherein, second backing roll 3 is the relatively fixed bottom that sets up in frame 1, is immovable for frame 1 promptly, and first backing roll 2 is mobilizable relative setting and is located the top of second backing roll 3, rolling driving piece 7 sets up at the top of frame 1 and specifically is located deviating from of first backing roll 2 one side of second backing roll 3, rolling driving piece 7 is connected with the direct drive of first backing roll 2 under the action of rolling driving piece 7, can order about first backing roll 2 moves down and is close to second backing roll 3. When the first support roller 2 moves downward and approaches the second support roller 3, the first support roller 2 and the second support roller 3 can respectively support the first rolling roller 4 and the second rolling roller 5, so that the first rolling roller 4 and the second rolling roller 5 approach each other to perform rolling operation.

Example two

The present embodiment is the same as the first embodiment. Further, referring to fig. 1 and fig. 2 again, in the pole piece rolling machine of the present embodiment, the rolling driving member 7 directly acts on the supporting roller bearing seat 6 on which the first supporting roller 2 is mounted when in operation, and drives the first supporting roller 2 to move by driving the supporting roller bearing seat 6.

In particular, the rolling drive 7 comprises two. The two rolling drive members 7 are distributed left and right and are provided corresponding to the left and right ends of the first support roller 2, respectively. Supporting roll bearing blocks 6 are respectively installed at the left end and the right end of the first supporting roll 2, so that the left end and the right end of the first supporting roll 2 can freely rotate, and the left end and the right end of the first supporting roll 2 are provided with a rolling driving piece 7 which corresponds to the left supporting roll bearing block 6 and the right supporting roll bearing block 6 respectively. And the rolling driving piece 7 is selected as an oil cylinder, the output end of the oil cylinder faces downwards, and a piston rod can directly extend downwards and push the supporting roller bearing seat 6 during working.

When rolling driving piece 7 starts and the piston shaft stretches out, the piston shaft can directly push up supporting roll bearing seat 6 downwards, thereby it is right both ends are used about first supporting roll 2 to order about first supporting roll 2 and remove downwards.

EXAMPLE III

The present embodiment is the same as the first or second embodiment. Further, referring to fig. 1 and fig. 2 again, in the pole piece rolling machine of the present embodiment, a roll bending mechanism is provided, which can perform a roll bending operation on the first roll 4 and the second roll 5.

Specifically, the bending roll mechanism comprises a bending roll driving member 8 arranged on the frame 1, and the bending roll driving member 8 can be selected from, but is not limited to, an oil cylinder. The bending roller driving part 8 is in operative connection with the first roller 4 and the second roller 5, when the first roller 4 and the second roller 5 roll the lithium battery pole pieces, local uniformity accuracy is low, the first roller 4 and the second roller 5 can generate a bending roller action opposite to the rolling direction under the driving of the bending roller driving part 8, and the bending roller supplement is accurately performed on the to-be-bent roller positions of the first roller 4 and the second roller 5.

In an optional embodiment, only the first roller 4 is correspondingly provided with the roller bending mechanism or only the second roller 5 is correspondingly provided with the roller bending mechanism, and when the roller bending is performed, only the first roller 4 or the second roller 5 is driven to perform the roller bending; or, the first roll 4 and the second roll 5 may be driven to bend by using a corresponding and independently provided roll bending mechanism, and both the first roll 4 and the second roll 5 may bend when performing roll bending.

Example four

This embodiment is the same as the embodiment. Further preferably, referring to fig. 1 and fig. 2 again, in the pole piece rolling machine of the present embodiment, the first roll 4 and the second roll 5 respectively adopt independent roll bending driving components 8 to perform roll bending supplementary driving; when the roller bending is carried out, the first roller 4 and the second roller 5 can both realize the roller bending, so that the roller bending convexity can be effectively and accurately controlled.

Specifically, as the roll bending driving unit 8, the roll bending driving unit 8 includes a first roll bending driving unit 81 and a second roll bending driving unit 82 which perform roll bending operations independently of each other. The first roll bending driving part 81 is arranged corresponding to the first roll 4 and is in operative connection with the first roll 4 to perform roll bending supplementary driving on the first roll 4; the second roll bending driving member 82 is disposed corresponding to the second roll 5, and is operatively connected to the second roll 5 to perform roll bending supplementary driving on the second roll 5.

In a preferred embodiment, referring to fig. 1 and fig. 2 again, the first bending roller driving member 81 includes two first bending roller driving members 81, and the two first bending roller driving members 81 are distributed left and right and are respectively disposed corresponding to the left and right ends of the first rolling roller 4. Both ends are installed respectively on the roll chock about first roll 4, and the output of first bending driving piece 81 is connected with the roll chock, can drive the roll chock at both ends about first roll 4 when first bending driving piece 81 moves and move, makes roll chock rebound, and can be right when the roll chock rebound the both ends of first roll 4 carry out the transmission effect to tip rebound about driving first roll 4 makes the both ends upwarp for the middle part and carry out the bending roller and supply about first roll 4.

In a preferred embodiment, referring to fig. 1 and fig. 2 again, the second bending roller driving members 82 include two second bending roller driving members 82, and the two second bending roller driving members 82 are distributed left and right and are respectively disposed corresponding to left and right ends of the second rolling roller 5. Both ends are installed respectively on the roll chock about the second roll 5, and the output of second bending drive spare 81 is connected with the roll chock, and the roll chock that can drive both ends about the second roll 5 when second bending drive spare 82 moves makes roll chock rebound, and can be right when the roll chock rebound the both ends of second roll 5 carry out the transmission effect to tip rebound about driving second roll 5 makes both ends warp down for the middle part and carries out the bending replenishment about the second roll 5.

The first bending roller driving piece 81 and the second bending roller driving piece 82 can be respectively and independently arranged, the mutual action is not interfered with each other, the shells of the first bending roller driving piece 81 and the second bending roller driving piece 82 are fixedly arranged on the frame 1, and the output ends are respectively and directly connected with the first rolling roller 4 and the second rolling roller 5; or, the first bending roller driving member 81 and the second bending roller driving member 82 may be integrally disposed, the two bending roller driving members share the same housing, the housing is fixedly disposed on the frame 1, two piston shafts which can respectively extend upwards and downwards are disposed on the housing, the two piston shafts are respectively directly connected to the first roller 4 and the second roller 5 or respectively directly push the first roller 4 and the second roller 5 when extending, the bending roller actions are performed independently of each other, and the two piston shafts have the same source of expansion power and are synchronously expanded.

EXAMPLE five

The present embodiment is the same as the first to fourth embodiments. Further, referring to fig. 1 and fig. 2 again, in the pole piece rolling machine of the present embodiment, the first rolling roller 4 and the second rolling roller 5 are both small-diameter rollers, and the diameter of the first rolling roller 4 and the diameter of the second rolling roller 5 are both smaller than the diameter of the first supporting roller 2 and the diameter of the second supporting roller 3.

In the illustrated embodiment, the first nip roller 4 and the second nip roller 5 have the same roller diameter, the first support roller 2 and the second support roller 3 have the same roller diameter, and the first nip roller 4 and the second nip roller 5 are both smaller than the roller diameter of the first support roller 2 and the second support roller 3. Optionally, but not limited to, the first roll 4 and the second roll 5 have a roll diameter of 100 to 300mm, and the first support roll 2 and the second support roll 3 have a roll diameter of 400 to 600 mm.

The rollers with small roller diameters can be arranged on the basis of the first roller 4 and the second roller 5, so that the cost of the whole roller press is reduced, the time required for roller replacement during rolling production is reduced, and the rolling production efficiency is effectively improved.

EXAMPLE six

The pole piece rolling method of the present invention adopts the pole piece rolling machine described in any one of the first to fifth embodiments to roll the lithium battery pole piece, please refer to fig. 3, and the pole piece rolling method includes the following steps:

and S1, passing the coated pole piece through a gap between the first roller 4 and the second roller 5 in an unreeling mode.

And S2, driving the first roller 4 and the second roller 5 to rotate through external force rotating driving pieces of the first roller 4 and the second roller 5, so that the first roller 4 and the second roller 5 reach the rotating speed which is the same as the pole piece unwinding speed.

At this time, the rolling driving member 7 is started, and the first supporting roller 2 is driven to press down and act on the first rolling roller 4 by the action of the rolling driving member 7, so that the first rolling roller 4 moves downwards to be close to the second rolling roller 5. The first roller 4 drives the first supporting roller 2 to rotate synchronously through friction force, and the second supporting roller 3 supports the second roller 5 and is driven by the second roller 5 to rotate synchronously through friction force.

The first roller 4 is pressed downwards to move to closely stick to the pole piece passing through the unreeling under the pressing action of the first supporting roller 2, and is matched with the second roller 5 to roll the pole piece from the upper surface to the lower surface of the pole piece.

S3, detecting the thickness uniformity of the rolled pole piece, and entering S4 if the rolled pole piece has uneven thickness along the width direction; otherwise, proceed directly to S5. And the pole pieces with uneven thickness after rolling are recovered, and reworking coating and rolling can be performed.

S4, uneven thickness of the rolled pole piece along the width direction, specifically, the situation that the middle of the pole piece is thick and the two sides of the pole piece are thin. At this time, the bending roller driving part 8 is started, the left end and the right end of the first roller 4 are driven to upwarp by the bending roller driving part 8, the left end and the right end of the second roller 5 are driven to upwarp, the first roller 4 and the second roller 5 generate bending roller convexity with opposite rolling directions, and then the pole piece rolling is continued.

And S5, obtaining the rolled qualified lithium battery pole piece until the rolled pole piece has no uneven thickness, namely rolling the pole piece, and rolling the rolled qualified pole piece.

The above embodiments are merely preferred embodiments of the present invention, and the technical solutions of the present invention are described in further detail, but the above descriptions are exemplary, not exhaustive, and are not limited to the disclosed embodiments, the scope and implementation of the present invention are not limited thereto, and any changes, combinations, deletions, substitutions or modifications that do not depart from the spirit and principle of the present invention are included in the scope of the present invention.

Claims

1. A pole piece roller press, comprising:

the first roller and the second roller can generate roller bending action opposite to the rolling direction under the driving of the roller bending driving piece; the first roller and the second roller are both rollers with small roller diameters, and the roller diameters are smaller than those of the first supporting roller and the second supporting roller.

2. The pole piece roller press of claim 1, wherein the first support roller, the second support roller, the first roller, the second roller, the roll drive, and the roll bending drive are disposed on a frame.

3. The pole piece roller press as claimed in claim 1, wherein the first support roller abuts against the first roller and is driven by the first roller to rotate synchronously; and/or the second support roller is abutted against the second roller and can be driven by the second roller to rotate synchronously.

4. The pole piece roller press as claimed in claim 1, wherein the second support roller is relatively fixed, and the rolling driving member is disposed on a side of the first support roller away from the second support roller, and drives the first support roller to approach the second support roller.

5. The pole piece rolling machine according to claim 4, wherein the rolling driving members comprise two rolling driving members, and the two rolling driving members are respectively arranged corresponding to the two ends of the first supporting roller and can drive the two ends of the first supporting roller.

6. The pole piece rolling machine according to claim 5, wherein both ends of the first support roller are respectively and freely rotatably mounted on two support roller bearing seats; the two rolling driving pieces are respectively arranged corresponding to the two supporting roller bearing seats and can directly drive the supporting roller bearing seats.

7. The pole piece roller press of claim 1, wherein the roller drive includes a first roller drive and a second roller drive; the first roller bending driving part and the second roller bending driving part are respectively in action connection with the first roller and the second roller.

8. The pole piece roller press as claimed in claim 7, wherein the first bending roller driving members include two first bending roller driving members, and the two first bending roller driving members are respectively disposed corresponding to and can drive two ends of the first roller.

9. The pole piece roller press as claimed in claim 7, wherein the second roller driving members include two second roller driving members, and the two second roller driving members are respectively disposed corresponding to and can drive two ends of the second roller.

10. A pole piece rolling method is characterized in that the pole piece rolling machine of any one of claims 1 to 9 is adopted for rolling, and the method comprises the following steps:

and S5, finishing rolling the pole piece, and rolling the rolled pole piece.