CN111834605B - Method for improving wavy edge of pole piece and roller press adopted by method - Google Patents

Method for improving wavy edge of pole piece and roller press adopted by method Download PDF

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Publication number
CN111834605B
CN111834605B CN202010687654.1A CN202010687654A CN111834605B CN 111834605 B CN111834605 B CN 111834605B CN 202010687654 A CN202010687654 A CN 202010687654A CN 111834605 B CN111834605 B CN 111834605B
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pole piece
roller
roll
thickness
edge
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CN111834605A (en
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刘碧辉
易万超
刘志明
王方伦
袁成龙
李万亮
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Dongguan Weike Battery Co ltd
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Dongguan Weike Battery Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/043—Processes of manufacture in general involving compressing or compaction
    • H01M4/0435—Rolling or calendering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B3/00—Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs
    • B30B3/005—Roll constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B3/00—Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs
    • B30B3/04—Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs co-operating with one another, e.g. with co-operating cones
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention relates to a method for improving the wavy edge of a pole piece and a roller press adopted by the method, wherein the roller diameters of an upper roller and a lower roller which are oppositely arranged in the roller press are respectively independent and gradually reduced from the middle to two sides along the axial direction; the roller press is adopted to roll the coated pole piece, so that the problem that the edge of the pole piece is stressed more due to the reaction force of the pole piece can be obviously improved, and the problem that the wavy edge is generated by rolling the pole piece is radically solved.

Description

Method for improving wavy edge of pole piece and roller press adopted by method
Technical Field
The invention belongs to the field of battery processing, and relates to a method for improving a pole piece wavy edge and a rolling machine adopted by the same.
Background
The lithium ion battery pole piece needs pass through the roll-in process at the production process, because the centre of pole piece is inconsistent with both sides atress when the roll-in, the edge can receive more extrudees, and the pole piece extends more, leads to the edge to form the wave limit. The wavy edge can influence the winding of the subsequent pole piece, and can seriously influence the coating effect of the negative pole piece on the positive pole piece, so that the safety performance of the battery is influenced; in the traditional rolling production method, the generation of the wavy edge of the pole piece is almost inevitable, so that the problems of low yield of the pole piece manufacturing process and high safety risk of a battery cell are caused.
CN203165997U discloses a battery pole piece coating and rolling system, which structurally comprises an unreeling machine and a reeling machine for a battery pole piece, wherein a coating machine and a rolling machine are sequentially arranged between the unreeling machine and the reeling machine, the coating machine comprises a coating rack, a coating machine head and a drying device, the coating machine head and the drying device are arranged on the coating rack, and the rolling machine comprises a rolling rack and a pair roller rolling device arranged on the rolling rack; a swing roller tension device and a process deviation correcting device are sequentially arranged between the coating machine and the roller press. The utility model can integrate the coating process and the rolling process of the battery pole piece together, automatically adjust the pole piece balance between the two processes in real time, and greatly improve the production automation degree and the production efficiency of the battery pole piece; however, the roller press adopts the traditional roller press, and the problem that the pole piece is easy to generate wavy edges exists in the rolling process.
CN208000966U discloses lithium battery pole piece hot rolling device, lithium battery pole piece hot rolling device include the hot steel roller set that adopts electric heating and be used for drawing the pole piece and make the pole piece be "S" shape parcel at the tape guide mechanism of hot steel roller, and the tape guide mechanism of roll squeezer feed inlet one side draws the pole piece on the hot steel roller to the roll squeezer feed inlet, and the tape guide mechanism of roll squeezer discharge gate one side draws the pole piece to the hot steel roller on, and the tape guide mechanism draws the tape guide mode and is following arbitrary one: A. an independent tape leading mode; B. the combined tape leading mode is used for increasing the contact area of the pole piece and the hot steel roller during heating and improving the performance of the pole piece; but the rolling process still has the problem of the wavy edge of the pole piece.
CN210607457U discloses a pole piece rolling device, which comprises a rolling pair roller and a wrinkle removing device arranged at the upstream and/or downstream of the rolling pair roller, a tension isolating device is arranged between the wrinkle removing device and the rolling pair roller, a tension roller for pressing the pole piece along the thickness direction of the pole piece to generate tension to the pole piece is arranged between the tension isolating device and the main roller, the pole piece rolling device further comprises a driving mechanism for driving the tension roller to act along the thickness direction of the pole piece to change the tension generated by the tension roller on the pole piece, the tension detection device comprises a tension detection roller and a controller, wherein the tension detection roller is used for detecting the tension of a pole piece between the tension partition device and a main roller, the controller is in signal connection with the tension detection roller, the controller is in control connection with a driving mechanism, and the controller is used for comparing a tension value detected by the tension detection roller with a tension set value and controlling the driving mechanism to act so as to keep the tension of the pole piece within the range of the tension set value; but the rolling process still has the problem of the wavy edge of the pole piece.
Therefore, the development of the rolling machine and the rolling method which can fundamentally and effectively reduce the problem of the wavy edge of the pole piece still have important significance.
Disclosure of Invention
The invention aims to provide a method for improving the wavy edge of a pole piece and a roller press adopted by the method, wherein the roller diameters of an upper roller and a lower roller which are oppositely arranged in the roller press are respectively independent and show taper decreasing from the middle to two sides along the axial direction; the roller press is adopted to roll the coated pole piece, so that the problem that the edge of the pole piece is stressed more due to the reaction force of the pole piece can be obviously improved, and the problem that the wavy edge is generated by rolling the pole piece is radically solved.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a roller press for improving the wavy edge of a pole piece, which comprises an upper roller and a lower roller which are arranged oppositely, wherein the roller diameters of the upper roller and the lower roller are respectively independent and gradually reduced from the middle to two sides along the axial direction of the upper roller and the lower roller.
In the traditional rolling process of the coated pole piece, because the fixing part of the roller is arranged on two sides of the roller and the middle part is a working area, the roller surface in contact with the pole piece can be subjected to a reaction force after the pole piece is placed in the rolling process of the pole piece, and the roller surface of the roller can be slightly bent towards the edge when the two sides of the roller are not in contact with the pole piece, as shown in an exemplary stress simulation cloud chart in fig. 1; at the moment, two sides of the pole piece are more extruded, so that wavy edges are generated; in order to solve the problems, the roll diameters of an upper roll and a lower roll of the roll squeezer are respectively independent and gradually reduced from the middle to two sides along the axial direction of the upper roll and the lower roll; the problem of pole piece wavy edges caused by the deformation of the roll surface due to the reaction force of the pole piece in the rolling process can be obviously solved.
By adopting the roller press, the roller diameters of the upper roller and the lower roller are gradually decreased from the middle to the two sides, and the slight deformation of the small roller diameters at the two sides on the two sides of the punching roller surface is utilized to reduce the extrusion of the edge of the pole piece, thereby reducing the generation of wavy edges and simultaneously improving the consistency of the rolled thickness of the pole piece. And the simulated cloud picture of the pole piece rolling process shows that the deformation of the roller surface is larger towards the edge of the roller, so that the diameter of the roller adopted by the invention is gradually reduced from the middle to two sides.
The rolling machine can effectively reduce the edge rolling of the coated pole piece during rolling, thereby avoiding the generation of wavy edges during rolling and improving the transverse thickness consistency of the pole piece during rolling.
Preferably, the roll surface curve equation of the upper roller and the lower roller is as follows:
y＝1×10-15x6+1×10-27x5+6×10-10x4+2×10-22x3+5×10-5x2+5×10-18x-0.2684；
wherein x is the coordinate of the roll surface, the origin of the coordinate is in the middle of the roll surface, and y is the convexity of the roll surface;
or the roll surface edge curve equation of the upper roller and the lower roller is as follows:
y＝2×10-4x20.105x +16.618, x being the roll face coordinates with origin at the roll face edge and y being the roll face crown.
The upper roller and the lower roller meet the same curve equation; the two equations describe the roll surface equations of the upper roller and the lower roller from different angles by adopting different origin of coordinates, and both can effectively improve the wavy edge effect of the pole piece.
According to the invention, the curve equations of the roll surfaces of the upper roller and the lower roller are obtained through simulation calculation, so that the conditions are met, and the problem of wavy edges caused by larger stress of the edges of the pole pieces compared with the middle area can be reduced to the maximum extent in the rolling process of the pole pieces after coating, so that the generation of the wavy edges of the pole pieces is fundamentally avoided.
The effective taper roller diameter is verified through simulation and experiments, and a curve equation is fitted according to the roller diameter data.
Preferably, the roller press further comprises a motor, and the motor is used for driving the upper roller and the lower roller to rotate towards the same direction.
Preferably, the roller press further comprises a hydraulic cylinder, the hydraulic cylinder is connected with the lower roller, and the hydraulic cylinder is used for applying pressure to the lower roller.
In the using process of the roller press, the upper roller and the lower roller are oppositely arranged, the fixing pieces of the rollers are positioned at two sides of the rollers, the side ends of the upper roller and the lower roller are connected with motors, and the motors drive the upper roller and the lower roller to rotate in the same direction; when the pole pieces are rolled, the pole pieces penetrate through the space between the upper roller and the lower roller, the hydraulic cylinder below the lower roller pressurizes to a proper pressure, the hydraulic cylinder drives the lower roller to ascend to apply pressure to the pole pieces, and the pole pieces are compressed under stress and are pressed to a required thickness to be output.
The roll diameters of the upper roller and the lower roller of the roll squeezer are respectively independent and gradually taper from the middle to the two sides along the axial direction, so that the roll surface deformation caused by the reaction force of the punched pole piece can be effectively avoided, the consistency of the thickness of the pole piece can be further ensured, and the problem of the wavy edge of the pole piece can be fundamentally solved.
In a second aspect, the present invention provides a method for improving wavy edge of a pole piece, wherein the method uses the roller press according to the first aspect to roll the coated pole piece.
The method for improving the wavy edge of the pole piece adopts the roller press as described in the first aspect, the roller diameters of the upper roller and the lower roller of the roller press are gradually reduced from the middle to the two sides along the axial direction, the reduced roller diameters at the two sides can effectively deform the roller surface slightly caused by the reaction force of the punching pole piece, so that the stress condition of the edge of the pole piece is improved, and the wavy edge of the pole piece is avoided.
Preferably, the coated pole piece comprises a middle area and side areas positioned at two sides of the middle area, and the thickness of the middle area is greater than or equal to that of the side areas.
According to the method, the coating thickness of the pole piece is adjusted, and the rolling machine with the specific roll surface structure is combined, so that the generation of the wavy edge of the pole piece can be obviously reduced, and the transverse thickness consistency of the pole piece can be effectively improved.
The width and thickness of the middle region of the coated pole piece are determined by normal process specifications.
Preferably, the width of the side regions is 3-10mm, such as 4mm, 5mm, 6mm, 7mm, 8mm or 9mm, etc.
The width of the side area is controlled within the range, which is beneficial to avoiding the generation of the wavy edge to the maximum extent, when the width of the side area is less than 3mm, the improvement effect on the wavy edge is limited, when the width of the side area is more than 10mm, the coating weight is lighter due to the corresponding edge thinning area, the side area belongs to the area with abnormal weight, the capacity is adversely affected due to the overlarge width, and the side area is generally cut off in a slitting way, so that the loss is larger.
Preferably, the thickness of the side regions is greater than or equal to 1/3 of the thickness of the middle region.
Preferably, the thickness of the side region gradually increases from the edge of the coated pole piece to the position adjacent to the middle region.
Preferably, the thickness of the edge of the corresponding coated pole piece in the side area is 1/3 of the thickness of the middle area, and the thickness of the position adjacent to the middle area in the side area is the same as the thickness of the middle area.
According to the method for improving the wavy edge of the pole piece, the thickness of the pole piece and the diameter of the roller press are adjusted, so that the wavy edge of the pole piece is effectively reduced during rolling, and the transverse thickness consistency of the pole piece is improved; the yield of the pole piece manufacturing process is further improved, and the occurrence of the safety risk of the battery cell is reduced; the method is beneficial to improving the production quality rate of the pole piece, improving the winding efficiency and improving the stability of the pole piece overlap.
Compared with the prior art, the invention has the following beneficial effects:
(1) the roller press comprises an upper roller and a lower roller, wherein the roller diameters of the upper roller and the lower roller are gradually reduced from the middle to two sides along the axial direction of the upper roller and the lower roller, and the roller press is used for rolling a coated pole piece and can effectively relieve the problem of pole piece wavy edges caused by larger stress on the edge of the pole piece than the middle area of the pole piece;
(2) the rolling machine can effectively improve the process yield of the pole piece and reduce the occurrence of safety risk of the battery cell.
Drawings
FIG. 1 is a stress simulation cloud chart of pole piece rolling by using a traditional roller press with equal-diameter rollers;
FIG. 2 is a simulated cloud of stress applied to pole piece rolling by the roller press of the present invention;
FIG. 3 is a graph of the roll surface in example 1 of the present invention;
FIG. 4 is a graph of the roll surface in example 2 of the present invention;
FIG. 5 is a schematic structural diagram of a coated pole piece used in the method for improving the wavy edge of the pole piece according to the present invention;
FIG. 6 is a thickness distribution graph of the rolled pole pieces of example 3 of the present invention and comparative example 1, with the abscissa representing the width divisions.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
The simulation of a stress simulation cloud chart is carried out on the traditional roller press adopting the equal-diameter roller and the roller press for rolling the pole piece;
comparative example 1
The comparative example simulates the stress condition of a coated pole piece in the rolling process by adopting a traditional roller press with equal diameter of a roller, and the stress simulation cloud chart is shown in figure 1;
it can be seen from fig. 1 that, when the pole piece after coating is rolled by using the conventional roller press with the equal diameter of the roller, the middle of the upper roller and the lower roller is the working area, because the fixing parts of the roller press are positioned at two sides of the roller press, after the pole piece is placed in the middle working area, the roller surface contacted with the pole piece can receive the reaction force, and the places of two sides not contacted with the pole piece do not exist, so that the roller surface can be slightly bent towards the edge, and two sides of the pole piece can be more extruded, so that the pole piece generates the wavy edge.
Example 1
In this embodiment, the stress condition of the coated pole piece in the rolling process is simulated by using the rolling machine of the present invention, wherein the roll surface curve equation of the rolling machine of the present invention is as follows:
y＝1×10-15x6+1×10-27x5+6×10-10x4+2×10-22x3+5×10-5x2+5×10-18x-0.2684；
wherein x is the coordinate of the roll surface, the origin of the coordinate is in the middle of the roll surface, and y is the convexity of the roll surface;
the stress simulation cloud picture is shown in fig. 2, and as can be seen from fig. 2, the roll surfaces of the upper roll and the lower roll of the roll squeezer meet the conditions, and the roll diameters of the upper roll and the lower roll are respectively independent and gradually reduced from the middle to two sides along the axial direction; the roll diameters of the two sides of the roll are smaller than that of the middle working area, and the small roll diameters of the two sides of the roll slightly deform to impact the roll surface, so that the extrusion of the edge of the antipodal segment is reduced, and the generation of wavy edges is reduced.
The curves of the roll surfaces of the upper and lower rolls in this embodiment are shown in FIG. 3.
Example 2
The difference between this example and example 1 is that the curve equations of the upper and lower rolls of the roll press used are:
y＝2×10-4x2-0.105x+16.618；
wherein x is the coordinate of the roll surface, the origin of the coordinate is at the edge of the roll surface, and y is the convexity of the roll surface.
The stressed simulated cloud picture is the same as that in the embodiment 1, the roll surfaces of the upper roll and the lower roll of the roll squeezer meet the conditions, and the roll diameters of the upper roll and the lower roll are respectively independent and gradually reduced from the middle to two sides along the axial direction of the upper roll and the lower roll; the roll diameters of the two sides of the roll are smaller than that of the middle working area, and the small roll diameters of the two sides of the roll slightly deform to impact the roll surface, so that the extrusion of the edge of the antipodal segment is reduced, and the generation of wavy edges is reduced.
The curves of the roll surfaces of the upper and lower rolls in this embodiment are shown in FIG. 4.
Example 3
In this embodiment, the roll press in embodiment 1 is adopted, and the structure of the coated pole piece is shown in fig. 5, the coated pole piece is divided into a middle area and side areas located at two sides of the middle area, wherein the thickness of the middle area is the normal thickness of the pole piece (i.e. the thickness of the coated pole piece in the conventional rolling process) and is marked as an a normal area, and the thickness of the side areas is thinned on the basis of the thickness of the middle area and is marked as a b thinned area;
the thickness of the position, corresponding to the edge of the pole piece, in the b-thinned area is 1/3, and the thickness of the position, adjacent to the middle area, of the b-thinned area is a normal thickness.
The width of the b-thinned area is 10 mm.
Example 4
This example is different from example 3 in that the width of the b-thinned region was 3mm, and the other conditions were exactly the same as in example 3.
The method for improving the wavy edge of the pole piece adopts the pole piece coated in the embodiment 3 and the embodiment 4, and the pole piece is matched with the roller press in the embodiment 1, so that the generation of the wavy edge in the rolling process of the coated pole piece can be effectively reduced, and the transverse thickness consistency of the pole piece is improved.
Rolling the pole piece coated with the conventional equal thickness by using the roller press in the comparative example 1, and testing the thickness distribution of the rolled pole piece, which is marked as conventional rolling; the pole piece obtained by rolling in the example 3 is tested for thickness distribution and recorded as improved rolling; the test result is shown in fig. 6, and it can be seen from fig. 6 that the thickness distribution of the pole piece obtained by using the roll squeezer of the present invention in combination with a specific pole piece structure is more even and consistent, and the generation of the pole piece wavy edge is effectively reduced, while the consistency of the middle thickness and the thicknesses of the two sides of the pole piece obtained in the comparative example is poor, and the wavy edge is serious.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.

Claims (9)

1. A roller press for improving the wavy edge of a pole piece comprises an upper roller and a lower roller which are oppositely arranged, and is characterized in that the diameters of the upper roller and the lower roller are respectively independent and gradually reduced from the middle to two sides along the axial direction of the upper roller and the lower roller;
the roller surface curve equation of the upper roller and the lower roller is as follows:
y＝1×10-15x6+1×10-27x5+6×10-10x4+2×10-22x3+5×10-5x2+5×10-18x-0.2684; wherein x is the coordinate of the roll surface, the origin of the coordinate is in the middle of the roll surface, and y is the convexity of the roll surface;
or the roll surface edge curve equation of the upper roller and the lower roller is as follows:
y＝2×10-4x20.105x +16.618, x being the roll face coordinates with origin at the roll face edge and y being the roll face crown.
2. The roller press of claim 1, further comprising a motor for rotating the upper and lower rollers in the same direction.
3. The roller press of claim 1, further comprising a hydraulic cylinder connected to the lower roller, the hydraulic cylinder being configured to apply pressure to the lower roller.
4. A method for improving the wavy edge of a pole piece, which is characterized in that the method adopts the roller press according to any one of claims 1 to 3 to roll the coated pole piece.
5. The method of claim 4, wherein the coated pole piece comprises a middle region and side regions on both sides of the middle region, and the thickness of the middle region is greater than or equal to that of the side regions.
6. A method according to claim 5, characterised in that the width of the side zones is 3-10 mm.
7. A method as claimed in claim 5, wherein the side regions have a thickness equal to or greater than 1/3 of the thickness of the middle region.
8. A method according to claim 5, wherein the thickness of the side regions increases progressively from the edges of the coated pole piece to adjacent the middle region.
9. The method of claim 8, wherein the thickness at the edge of the corresponding coated pole piece in the side region is 1/3 times the thickness of the middle region, and the thickness in the side region adjacent to the middle region is the same as the thickness of the middle region.
CN202010687654.1A 2020-07-16 2020-07-16 Method for improving wavy edge of pole piece and roller press adopted by method Active CN111834605B (en)

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CN102632111A (en) * 2012-04-06 2012-08-15 马钢(集团)控股有限公司 Semi-process electrical steel plate flattening machine and method for flattening steel plate by using semi-process electrical steel plate flattening machine
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CN203459397U (en) * 2013-08-20 2014-03-05 东莞新能源科技有限公司 Pole sheet rolling press capable of being used for pre-bending rollers
KR20170038263A (en) * 2015-09-30 2017-04-07 주식회사 엘지화학 Pressing Device Including Concavo-Convex Portion
CN208093647U (en) * 2018-03-28 2018-11-13 合肥国轩高科动力能源有限公司 A kind of rolling pole piece of lithium ion battery device
CN209140318U (en) * 2018-12-14 2019-07-23 永日电梯江苏有限公司 The workpiece that elevator groove profile mounting plate is integrally formed equipment is integrally formed part
CN209668407U (en) * 2018-12-27 2019-11-22 九江德福科技股份有限公司 A kind of anti-fold press-roller device
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