CN113972353A - Segmented heating and rolling mechanism and pole piece rolling method - Google Patents

Abstract

The invention discloses a sectional heating and rolling mechanism and a pole piece rolling method. The segmented heating and rolling mechanism comprises the working rollers which are oppositely arranged, the segmented heating assemblies are arranged on the outer sides of the working rollers, when the lithium battery pole pieces are rolled, the working rollers can be subjected to axial segmented heating through the segmented heating assemblies, so that the roller convexity of a corresponding heating area of the working rollers is changed, the working rollers can obtain accurate roller convexity change along the axial direction, the lithium battery pole pieces can be subjected to accurate heating and rolling in an adaptive manner, the thickness difference uniformity of the lithium battery pole pieces along the longitudinal direction is improved, and the quality of the produced lithium battery pole pieces is ensured. The pole piece rolling method is based on the sectional heating and rolling mechanism for rolling, and can adjust the heating power of the heating head corresponding to the pole piece abnormal thickness area in real time according to the production condition, thereby ensuring the thickness uniformity of the rolled pole piece and rolling the pole piece with stable production quality.

Description

Segmented heating and rolling mechanism and pole piece rolling method

Technical Field

The invention relates to the technical field of battery pole piece production equipment, in particular to a segmented heating and rolling mechanism and a pole piece rolling method.

Background

In the production process of the lithium battery pole piece, a process of rolling the pole piece is involved, and the rolled pole piece can be stretched and compacted, so that the produced pole piece is ensured to have proper compaction density, and the quality of the produced battery is further ensured. At present, based on the rapid development of lithium battery technology, higher and higher requirements are provided for the thickness uniformity of a 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, and the roller convexity is changed by adopting a roller bending device on the traditional rolling equipment, so that the uniformity of the longitudinal thickness difference of the pole piece is improved. However, the existing roll bending device has a simple structure, so that the roll and the bearing are not stressed unreasonably, especially the roll diameter of the roll is large, the bending cylinder force cannot obtain the desired roll crown well, the thick rolled pole piece still has the phenomenon of thick middle and thin two sides, and the thickness difference uniformity of the pole piece and the capacity and performance of the lithium battery are influenced.

Disclosure of Invention

In order to solve the problems that the conventional roll bending device is difficult to obtain accurate roll crown and cannot solve the problems that the middle of the roll bending device is thick and two sides of the roll bending device are thin in the pole piece rolling process, the invention provides the sectional heating assembly for the roll, which can perform sectional heating on the roll in a sectional heating mode, so that the roll crown at the corresponding position of the roll is changed, and the accurate roll crown change is obtained.

The invention also aims to provide a segmented heating and pressing mechanism which is based on the segmented heating assembly for the roller and can ensure that the thickness of the lithium battery pole piece after heating and pressing is uniform.

The invention also aims to provide a pole piece rolling method, which adopts the segmented heating and rolling mechanism for rolling.

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

A segmented heating assembly for a roll comprising an array of heating heads;

the number of the heating head arrays is more than one, and each heating head array comprises a plurality of heating heads; the heating heads are arranged along the axial direction of the roller, and each heating head can independently perform heating work.

In a preferred embodiment, the number of the heating head arrays is two or more, the two or more heating head arrays are arranged along the circumferential direction of the roller, and the heating heads between two adjacent heating head arrays are distributed in a staggered manner in the circumferential direction.

In a more preferred embodiment, two adjacent heating head arrays have a deflection angle between them, which is adapted to the change of the circumferential arc of the roller.

In a more preferred embodiment, the array of heating tips is supported on a heating beam.

In a further preferred embodiment, when the number of the heating heads is two or more, two adjacent heating beams are connected with each other or independently arranged.

A sectional heating and pressing mechanism comprises a first working roll and a second working roll which are oppositely arranged; at least the outer side of the first working roll is provided with a sectional heating component which can perform sectional heating on the first working roll along the axial direction, and the sectional heating component is any one of the sectional heating components for the roll.

In a preferred embodiment, the first working roll and the second working roll are both freely rotatably arranged on the frame.

In a preferred embodiment, the first working roll and the second working roll are driven to approach each other by a main drive to perform a rolling action.

Further preferably, the main driving member is an oil cylinder.

In a preferred embodiment, the discharge end of the rolling mechanism is provided with a thickness gauge. Further preferably, the thickness gauge is a laser thickness gauge.

In a more preferable embodiment, the segmented heating assembly is connected with a heating head control electric box, and the thickness gauge is connected with the heating head control electric box in a feedback control mode.

In a preferred embodiment, in the segment heating and pressing mechanism according to any one of the above, the segment heating assembly is disposed outside the second working roll, and the second working roll can be heated in a segment manner in the axial direction.

A pole piece rolling method adopts the segmented heating and rolling mechanism to roll, and comprises the following steps:

s1, starting the segmented heating assembly, and at least heating the first working roll in a segmented mode along the axial direction;

s2, conveying the pole piece to pass through between the first working roller and the second working roller, and rolling by the first working roller and the second working roller;

s3, detecting the thickness uniformity of the rolled and discharged pole piece in the width direction; if the thickness uniformity is qualified, entering S5; if the thickness uniformity is unqualified, the process goes to S4;

s4, adjusting the heating power of the heating head corresponding to the rolling area of the first working roll corresponding to the abnormal thickness area in the width direction of the pole piece, and entering S2-S3;

and S5, maintaining the heating power of each heating head of the segmented heating assembly, and continuing to roll the pole piece.

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

the sectional heating assembly for the roller is provided with the heating head array with the plurality of heating heads, so that sectional heating of the roller can be realized, the roller convexity of the roller is improved, and the lithium battery pole piece can be rolled with uniform thickness in an adaptive manner. And the heating rate of the heating head is high, and the rapid adjustment of the roller convexity can be realized timely and flexibly.

According to the sectional heating and rolling mechanism, the sectional heating assembly for the roller is arranged on the outer side of the working roller, when the lithium battery pole piece is rolled, the sectional heating assembly for the roller can be used for carrying out sectional heating on the working roller along the axial direction, so that the roller convexity of the working roller corresponding to each heating head is changed, the working roller can obtain accurate roller convexity change along the axial direction, the lithium battery pole piece can be heated and rolled accurately in an adaptive manner, and the thickness difference uniformity of the lithium battery pole piece along the longitudinal direction is improved. Meanwhile, unreasonable stress of the bent cylinder structure is avoided, and the working roller and the bearing are effectively protected.

In addition, in this segmentation heating crimping mechanism, set up the roll-in thickness control closed loop system of calibrator and heating head control electronic box to the realization can be in real time automatic regulation control to the segmentation heating condition of working roll, and then the real-time accurate control working roll's axial roller convexity change, in time improve the thickness homogeneity of the lithium-ion battery pole piece of roll-in, ensure the quality stability of the pole piece of production.

The pole piece rolling method is based on the sectional heating and rolling mechanism for rolling, and can adjust the heating power of the heating head corresponding to the pole piece abnormal thickness area in real time according to the production condition, thereby ensuring the thickness uniformity of the rolled pole piece and rolling the pole piece with stable production quality.

Drawings

FIG. 1 is a schematic structural view of a sectional heating assembly for a roll of the present invention in a specific embodiment;

FIG. 2 is a front view of a segment heating and pressing mechanism of the present invention in an exemplary embodiment;

FIG. 3 is a side view of a segmented heating and pressing mechanism of the present invention in an exemplary embodiment;

FIG. 4 is a schematic diagram of a working roll heating and rolling in sections corresponding to a thickness measuring area of a thickness gauge;

FIG. 5 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-segmented heating assembly, 101-heating head array, 101 a-first heating head array, 101 b-second heating head array, 1011-heating head, 102-heating beam, 102 a-first heating beam, 102 b-second heating beam, 2-first working roller, 3-second working roller, 4-frame, 5-main driving piece, 6-thickness gauge, 7-heating head control electric box and 8-pole piece.

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", "front", "back", "left", "right", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships in which the products of the invention are conventionally placed when in use, and the terms "first", "second", etc. are used for convenience of distinction and are used only for convenience of describing the invention and simplifying the description, but do not indicate or imply that the structures or elements 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, nor are relative importance indicated or implied.

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.

The sectional heating component for the roller can perform sectional heating on the roller along the axial direction. The roller comprises a steel roller for rolling the lithium battery pole piece or other types of rollers for rolling, the axial direction is the direction along the length or the longitudinal direction of the roller, and the roller can expand when heated, and particularly generates different expansions when receiving different heating at each position in the axial direction.

Referring to fig. 1, the sectional heating assembly for a roller includes a heating head array 101. Specifically, the number of the heating head arrays 101 is more than one, and the number of the heating head arrays 101 may be determined according to actual conditions, and preferably, the number of the heating head arrays 101 is more than two.

Each heating head array 101 includes a plurality of heating heads 1011, that is, the heating head array 101 is specifically an array formed by arranging a plurality of heating heads 1011, and the number of the heating heads 101 is specifically more than one. Based on the fact that segmented heating is achieved along the axial direction of the roller, the heating heads 1011 are arranged along the axial direction of the roller, wherein each heating head 1011 can independently perform heating work, and corresponding positions on the roller can be heated when the corresponding heating heads 1011 work, so that due to the heating effect of the heating heads 1011 along the axial direction with different heating powers, the positions of the roller corresponding to the heating heads 1011 are subjected to thermal expansion in different degrees, and the roller is subjected to convexity change along the axial direction.

In a preferred embodiment, two or more heating head arrays 101 are arranged along the circumferential direction of the roller, where the "circumferential direction" is a direction along which the arc-shaped curved surface of the roller changes, and a plurality of heating head arrays 101 are arranged along the circumferential direction to achieve efficient heating of the roller as much as possible. Moreover, the heating heads 1011 between two adjacent heating head arrays 101 are distributed in a staggered manner in the circumferential direction, so that one heating head 1011 can respectively correspond to one heating area on the roller, and segmented heating of the roller is realized.

Optionally, the distance between each heating head array 101 and the roll surface may be independently adjusted, for example, the distances between the plurality of heating head arrays 101 and the roll surface may be equal or different, and the specific distance range may be actually determined. Preferably, when the distances between the plurality of heating head arrays 101 and the surface of the roller are equal, a deflection angle corresponding to a change in the circumferential arc surface of the roller is provided between two adjacent heating head arrays 101, so that the distances between the heating head arrays 101 and the surface of the roller are equal.

As a support arrangement for heating heads 1011 on heating head array 101, heating head array 101 is supported on heating beam 102. The heating beam 102 has a length parallel to the axial direction of the roller, and the plurality of heating heads 101 of the heating head array 101 are arranged along the length direction of the heating beam 102 and respectively correspond to different heating regions on the roller. Further, when more than two heating head arrays 101 are provided, the positional relationship between two adjacent heating beams 102 may be specifically set as required, and may be connected to each other or set independently of each other; optionally, a deflection angle adapted to the change of the circumferential arc surface of the roller may be disposed between two adjacent heating beams 102, so that two groups of heating head arrays 101 disposed adjacently have deflection angles, and further, the two groups of heating head arrays 101 disposed adjacently are equidistant from the surface of the roller.

In the specific embodiment shown in fig. 1, the segmented heating assembly for a roller includes a first heating head array 101a and a second heating head array 101b, which are adjacently disposed, wherein the first heating head array 101a has 4 heating heads 101 arranged along the axial direction, the second heating head array 101b has 3 heating heads 101 arranged along the axial direction, and the 4 heating heads 101 of the first heating head array 101a and the 3 heating heads 101 of the second heating head array 101b are circumferentially staggered from each other. Moreover, 4 heating heads 101 of the first heating head array 101a are all arranged on the first heating beam 102a, 3 heating heads 101 of the second heating head array 101b are all arranged on the second heating beam 102b, and the first heating beam 102a and the second heating beam 102b are adjacently arranged and spliced along the circumferential direction; further, the first heating beam 102a and the second heating beam 102b have a deflection angle therebetween in accordance with a change in the circumferential arc surface of the roller, so that the first heating head array 101a and the second heating head array 101b provided on the first heating beam 102a and the second heating beam 102b, respectively, have a deflection angle therebetween in accordance with a change in the circumferential arc surface of the roller, and the heating heads 101 of the first heating head array 101a and the second heating head array 101b are equidistant from the surface of the roller.

The segment heating and pressing mechanism of the present invention, as shown in fig. 2 and 3, includes a first work roll 2 and a second work roll 3 disposed opposite to each other. Wherein, the relative position of the first working roll 2 and the second working roll 3 can be up and down, left and right or front and back, and fig. 2 and 3 show the first working roll 2 and the second working roll 3 which are arranged up and down oppositely. Specifically, the first working roll 2 and the second working roll 3 are both arranged on the frame 4 in a freely rotatable manner through bearing seats; and, there is a main driving member 5 for rolling, the first working roll 2 and the second working roll 3 can be driven to approach each other by the main driving member 5 for rolling action, the main driving member 5 can be selected but not limited to an oil cylinder, as shown in the specific embodiment shown in fig. 2, the main driving member 5 is disposed below the first working roll 2 and can drive the first working roll 2 to move upward to approach the second working roll 3; further, a rolling station is arranged between the first working roll 2 and the second working roll 3, a feeding end side and a discharging end side are arranged in front of and behind the rolling station, and optionally, rollers are arranged on the feeding end side and the discharging end side.

When the rolling operation is carried out, the pole piece 8 to be rolled enters a rolling station between the first working roller 2 and the second working roller 3 from the feeding end side, the main driving piece 5 drives the first working roller 2 and the second working roller 3 to be close to each other, the pole piece 8 entering the rolling station is rolled, and the pole piece 8 is compacted and thinned. And outputting the rolled pole piece 8 from the side of the discharging end for discharging.

In addition, at least the outer side of the first working roll 2 is provided with the sectional heating assembly 1, so that the first working roll 2 can be heated, and the pole piece 8 can be heated and rolled. The sectional heating assembly 1 is the above-mentioned sectional heating assembly for the roller, and the plurality of heating heads 1011 on the sectional heating assembly 1 respectively correspond to a section of area on the first working roller 2, and can perform sectional heating on the first working roller 2 along the axial direction, so that the first working roller 2 generates roller crown change in the axial direction.

In the rolling process of the pole piece 8, the pole piece 8 has the problem of uniformity of thickness difference in the longitudinal direction including the middle part being thin and the two sides being thick, the segmented heating assembly 1 is used for conducting segmented heating on the first working roller 2 along the axial direction in the rolling process, the longitudinal direction is the direction of the pole piece 8 in the width direction, and the longitudinal direction can be understood as the direction corresponding to the axial direction of the first working roller 2. The plurality of heating heads 1011 arranged along the axial direction of the heating head array 101 on the segmented heating assembly 1 respectively correspond to a section of area on the first working roll 2 one by one, and each heating head 1011 can independently heat a corresponding section of area on the first working roll 2. During rolling operation, the plurality of heating heads 1011 arranged along the axial direction of the segmented heating assembly 1 respectively and independently work, so that different thermal expansions are generated in each heating area on the first working roll 2, and different convexity changes are generated on the roll surface of the first working roll 2 along the axial direction. If a thicker rolling area corresponding to the pole piece 8 appears, the heating power can be increased by the heating head 1011 corresponding to the corresponding heating area on the first working roll 2, so that the roll convexity corresponding to the heating area is increased, and the corresponding rolling area of the pole piece 8 is thinned; and a thinner rolling area corresponding to the pole piece 8 is formed, the heating power can be reduced or not heated by the heating head 1011 corresponding to the corresponding heating area on the first working roll 2, so that the roll crown corresponding to the heating area is reduced or has no crown, and the rolling area of the corresponding pole piece 8 is thickened.

Referring to fig. 2 again, a thickness gauge 6 is disposed at the discharge end of the rolling station of the first working roll 2 and the second working roll 3, the thickness gauge 6 may be selected but not limited to a laser thickness gauge, and can monitor the thickness of the rolled and discharged pole piece 8 to obtain the rolling condition of the pole piece 8, so that the segmented heating operation of the segmented heating assembly 1 on the first working roll 2 can be controlled according to the obtained rolling condition of the pole piece 8. Wherein, the pole piece 8 is provided with a plurality of thickness measuring areas which can be monitored by the thickness gauge 6, the thickness measuring areas on the pole piece 8 are respectively corresponding to a plurality of subsection heating areas on the first working roll 2 one by one, the subsection heating component 1 is provided with a plurality of heating heads 1011 which are corresponding to the subsection heating areas of the first working roll 2 one by one, in the specific embodiment shown in fig. 4, the pole piece 8 includes 7 thickness measurement regions a1, b1, c1, d1, e1, f1 and g1, the first work roll 2 is axially divided into 7 heating regions a2, b2, c2, d2, e2, f2 and g2, the segmented heating assembly 1 disposed outside the first work roll 2 is provided with 7 heating heads 1011 corresponding to the 7 heating regions a2, b2, c2, d2, e2, f2 and g2, and the 7 thickness measurement regions on the pole piece 8 correspond to the 7 heating regions on the first work roll 2. When the thickness gauge 6 monitors that the thickness measurement area on the rolled pole piece 8 has uneven thickness, the heating operation of the heating head 1011 corresponding to the segmented heating area on the first working roll 2 can be correspondingly adjusted for the thickness measurement area with thickness deviation, so that the roll crown of the segmented heating area on the corresponding first working roll 2 is changed, the rolling thickness of the corresponding thickness measurement area on the pole piece 8 is correspondingly improved, and the pole piece 8 with uniform rolling thickness is obtained.

Further, segmentation heating element 1 is connected with heating head control electronic box 7, wherein, calibrator 6 with heating head control electronic box 7 feedback control is connected. Optionally, the thickness gauge 6 is connected with the heating head control electrical box 7 through a PLC controller, and a built-in algorithm is provided in the PLC controller, which can calculate the obtained data and send an instruction. The heating head control electric box 7 can control the electric output power of the heating heads 1011, further control the heating power of the heating heads 1011 to the corresponding heating area on the first working roll 2, and optionally, the electric output power of each heating head 1011 on the segmented heating assembly 1 is independently controlled respectively. Therefore, when the thickness gauge 6 monitors that the thickness of the corresponding thickness measuring area on the pole piece 8 is abnormal, the abnormal thickness can be fed back to the PLC in real time and the heating head control electric box 7 is instructed to adjust the electric output power of the corresponding heating head 1011, so that the roll crown of the segmented heating area on the corresponding first working roll 2 is changed, the rolling thickness of the corresponding thickness measuring area on the pole piece 8 is correspondingly improved, a rolling thickness control closed-loop system is formed, the axial roll crown change of the first working roll 2 is accurately controlled in real time, the thickness uniformity of the rolled pole piece 8 is timely improved, and the quality stability of the produced pole piece 8 is ensured.

In addition, as shown in fig. 2 and 3, in a specific preferred embodiment, the segmented heating assemblies 1 are arranged on the outer sides of the first working roll 2 and the second working roll 3, and the corresponding segmented heating assemblies 1 can respectively perform segmented heating on the first working roll 2 and the second working roll 3 along the axial direction. So, make first working roll 2 and second working roll 3 all can be heated, first working roll 2 and second working roll 3 after being heated can be better realize the heating roll-in to pole piece 8. Further preferably, the sectional heating assembly 1 is the sectional heating assembly for the roller, so that the first working roller 2 and the second working roller 3 can realize sectional heating adjustment of the roller convexity, and the thickness uniformity adjustment of the pole piece 8 is facilitated.

Optionally, a thickness gauge 6 is arranged at the discharge end of the rolling station of the first working roll 2 and the second working roll 3, the segmented heating assemblies 1 arranged at the outer sides of the first working roll 2 and the second working roll 3 are both connected with a heating head control electric box 7, and the thickness gauge 6 is connected with the heating head control electric box 7 in a feedback control manner to form a rolling thickness control closed-loop system.

The operation flow of rolling the pole piece based on the segmented heating and pressing mechanism is shown in fig. 5, and specifically includes the following steps:

s1, starting the segmented heating assembly 1 to enable the first working roll 2 to be heated axially in a segmented mode, or enabling the first working roll 2 and the second working roll 3 to be heated axially in a segmented mode simultaneously;

s2, conveying the pole piece 8 to be rolled to pass through the space between the first working roller 2 and the second working roller 3, and heating and rolling the pole piece by the first working roller 2 and the second working roller 3;

s3, monitoring the thicknesses of the rolled and discharged pole pieces 8 in a plurality of thickness measurement areas in the width direction in real time by the thickness gauge 6, feeding monitoring information back to the PLC, analyzing the thickness uniformity, and making corresponding instructions to the heating head control electric box 7 by the PLC; if the thickness uniformity is qualified, entering S5; if the thickness uniformity is unqualified, the process goes to S4;

s4, the heating head control electric box 7 receives an instruction sent by the PLC, adjusts the heating power of the heating head 1011 corresponding to the heating area of the first working roll 2 corresponding to the thickness abnormal thickness measuring area in the width direction of the pole piece 8, or adjusts the heating power of the heating head 1011 corresponding to the heating areas of the first working roll 2 and the second working roll 3 corresponding to the thickness abnormal thickness measuring area in the width direction of the pole piece 8, so that the roll crown of the heating area of the corresponding section area on the first working roll 2 or the first working roll 2 and the second working roll 3 is changed, and the process goes to S2-S3;

and S5, the heating head control electric box 7 receives an instruction sent by the PLC, keeps the heating power of each heating head 1011 of the segmented heating assembly 1, and continues to roll the 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 (10)

1. The sectional heating and pressing mechanism is characterized by comprising a first working roller and a second working roller which are oppositely arranged; at least the outer side of the first working roll is provided with a sectional heating component which can perform sectional heating on the first working roll along the axial direction;

the segmented heating assembly comprises an array of heating heads; the number of the heating head arrays is more than one, and each heating head array comprises a plurality of heating heads; the heating heads are arranged along the axial direction of the roller, and each heating head can independently perform heating work.

2. The segment heating and pressing mechanism according to claim 1, wherein the first working roll and the second working roll are driven to approach each other by a main drive member to perform a rolling action.

3. The segmented heating assembly for a roller according to claim 1, wherein the heating head arrays are two or more, the two or more heating head arrays are arranged along the circumferential direction of the roller, and the heating heads between two adjacent heating head arrays are staggered in the circumferential direction.

4. The sectional heating assembly for a roll as claimed in claim 3, wherein the deflection angle between two adjacent heating head arrays is adapted to the change of the circumferential arc surface of the roll.

5. The segmented heating assembly for a roll of claim 1, wherein the array of heating tips is supported on a heating beam.

6. The sectional heating assembly for a roll as claimed in claim 5, wherein when the number of the heating heads is two or more, two heating beams adjacent to each other are connected to each other or independently provided from each other.

7. A segment heating and pressing mechanism according to claim 1, wherein the discharge end of the rolling mechanism is provided with a thickness gauge.

8. The segmented heating and pressing mechanism according to claim 7, wherein the segmented heating assembly is connected with a heating head control electric box, and the thickness gauge is connected with the heating head control electric box in a feedback control mode.

9. The segment heating and pressing mechanism according to any one of claims 1 to 8, wherein the segment heating unit is provided outside the second working roll, and the second working roll is heated in segments in the axial direction.

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

s1, starting the segmented heating assembly, and at least heating the first working roll in a segmented mode along the axial direction;

s2, conveying the pole piece to be rolled to pass through the space between the first working roller and the second working roller, and rolling by the first working roller and the second working roller;

s3, detecting the thickness uniformity of the rolled and discharged pole piece in the width direction; if the thickness uniformity is qualified, entering S5; if the thickness uniformity is unqualified, the process goes to S4;

s4, adjusting the heating power of the heating head corresponding to the rolling area of the first working roll corresponding to the abnormal thickness area in the width direction of the pole piece, and entering S2-S3;

and S5, maintaining the heating power of each heating head of the segmented heating assembly, and continuing to roll the pole piece.

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