CN115228931A - Hot rolling equipment and method for battery pole piece - Google Patents
Hot rolling equipment and method for battery pole piece Download PDFInfo
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- CN115228931A CN115228931A CN202211146726.7A CN202211146726A CN115228931A CN 115228931 A CN115228931 A CN 115228931A CN 202211146726 A CN202211146726 A CN 202211146726A CN 115228931 A CN115228931 A CN 115228931A
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- 238000005098 hot rolling Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005096 rolling process Methods 0.000 claims abstract description 105
- 230000007704 transition Effects 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 12
- 239000000428 dust Substances 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000005728 strengthening Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000002344 surface layer Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 230000009467 reduction Effects 0.000 abstract description 7
- 238000005452 bending Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 33
- 239000010720 hydraulic oil Substances 0.000 description 9
- 238000003825 pressing Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/03—Sleeved rolls
- B21B27/032—Rolls for sheets or strips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/08—Lubricating, cooling or heating rolls internally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/16—Adjusting or positioning rolls
- B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
- B21B31/32—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis by liquid pressure, e.g. hydromechanical adjusting
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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
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- 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
Abstract
The invention discloses a battery pole piece hot rolling device and a rolling method thereof, belonging to the technical field of pole piece rolling production and manufacturing; the pole piece rolling machine comprises a first roller machine and a second roller machine, wherein the roller machines are respectively composed of a supporting roller, a working roller, an electro-hydraulic servo device and a hydraulic balance device, the supporting roller is used for driving the working roller to roll a pole piece, the rolling reduction position of the roller is adjusted through the electro-hydraulic servo device and the hydraulic balance device, the large deflection deformation of the roller of the pole piece rolling machine when the roller is subjected to a roller bending force is reduced, the stress of the roller is improved, and the rolling precision is improved. The working roll adopts a double-layer structure assembled by a roll core and a roll sleeve, a central oil duct is arranged at the axis of the roll core, and a spiral oil duct is arranged on the roll surface of the roll core. According to the invention, the multi-stage rolling device is adopted, the multi-pass hot rolling device with different rolling reduction is adopted, and the consistency of the thickness of the pole piece is improved and the structure of the pole piece is improved through multi-pass rolling.
Description
Technical Field
The invention relates to the technical field of pole piece rolling production and manufacturing, in particular to a battery pole piece hot rolling device and a rolling method thereof.
Background
The lithium ion battery is a high-capacity long-life environment-friendly battery, has the advantages of high voltage, large specific energy, long cycle life, good safety performance and the like, and is widely applied to the fields of energy storage, electric automobiles, portable electronic products and the like. With the development of various application fields, higher requirements are put forward on the specific energy, the service life, the safety and the price of the lithium ion battery.
The positive and negative pole pieces are used as core components of the lithium battery, and the indexes of the positive and negative pole pieces, such as the consistency of the roll forming thickness, the compaction density, the peeling strength and the like, relate to the core performance of the battery. The rolling process is used as the most critical step in the production of the pole piece, the rolling of the pole piece directly influences the performance of the battery pole piece, and the surface density, the compaction density and the thickness consistency of the pole piece are three parameters which are frequently involved in the manufacturing process of the pole piece and have important influence on the performance of the battery.
Along with the production development of the pole piece, the rolling width of the pole piece is increased, and the width of the roller surface of the roller is also increased. The existing rolling equipment mostly adopts a two-roll cold rolling mill for rolling, a roller directly receives rolling force and is stressed unevenly, the roller surface is easy to deform, the pole piece has uneven thickness, the consistency of the pole piece thickness is not up to standard, the performance of the pole piece is influenced, the loss of the roller is large, and the equipment cost is increased.
Disclosure of Invention
In view of this, the invention provides a battery pole piece hot rolling device and a rolling method thereof; the rolling device is used for improving the consistency and the rolling stability of the pole pieces, improving the energy density of the pole pieces and prolonging the service life of the rolling device.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a battery pole piece hot rolling device comprises a driving assembly, a transmission assembly and a rolling assembly; the rolling assembly mainly comprises a first roller machine and a second roller machine; the first roller machine and the second roller machine are fixed on the machine base, and the roller gap of the first roller machine is opposite to the roller gap of the second roller machine; the first roller machine and the second roller machine respectively comprise a frame, a hydraulic balance device, an electro-hydraulic servo device, a roller group and a roller bearing seat provided with a roller end part;
the stand is two vertical plates which are arranged on the stand and are opposite to each other; a limiting groove is formed in the middle of the vertical plate;
the roll set mainly comprises two supporting rolls and two working rolls, and the working rolls and the supporting rolls are parallel in pairs; the roll bearing blocks at the two ends of the supporting roll and the working roll are respectively arranged in the limiting grooves of the corresponding vertical plates, and each roll bearing block can move up and down along the limiting groove of the corresponding vertical plate; between the two vertical plates, an upper supporting roller, an upper working roller, a lower working roller and a lower supporting roller are sequentially arranged from top to bottom, and adjacent supporting rollers and working rollers are tightly attached; the electro-hydraulic servo device comprises an upper hydraulic telescopic rod and a lower hydraulic telescopic rod; the fixed end of the upper hydraulic telescopic rod is fixedly arranged on the top wall in the limiting groove, and the action end of the upper hydraulic telescopic rod is connected to the top of the roller bearing seat corresponding to the upper supporting roller through an upper hydraulic balancing device; the fixed end of the lower hydraulic telescopic rod is fixedly arranged on the bottom surface in the limiting groove, and the action end of the lower hydraulic telescopic rod is connected to the bottom of the corresponding roller bearing seat of the lower supporting roller through a lower hydraulic balancing device;
the driving assembly drives the supporting roll to rotate through the transmission assembly, and the supporting roll drives the working roll to rotate through friction force.
Furthermore, a transition roller with adjustable height is arranged between the first roller machine and the second roller machine; the transition roll is parallel to the support roll and the working roll.
Further, the hydraulic balance device comprises two L-shaped plates and an I-shaped seat; the movable end of the hydraulic telescopic rod is connected to the I-shaped seat; two short branch sections of the two L-shaped plates are respectively positioned in connecting grooves at two sides of the I-shaped seat, and two corresponding long branch sections of the two L-shaped plates are respectively tightly attached to two side walls of the limiting groove; the two L-shaped plates are mirror-symmetrical.
Furthermore, the driving assembly is a speed reducing motor, and the transmission assembly comprises a universal joint shaft, a worm balancing device and a coupler; the output end of the speed reducing motor is connected with the driving end of the supporting roll through a corresponding universal coupling shaft and a coupling respectively; the universal spindle realizes stable transmission through a worm balancing device.
Further, the working roll comprises a roll core and a roll sleeve; the surface of the roller core of the working roller is provided with a spiral oil duct with a spiral line structure; the input section and the output section of the spiral oil duct both penetrate through the central axis of the working roller; the surface layer of the roller sleeve of the working roller is subjected to surface strengthening treatment.
Furthermore, a sliding plate is arranged between the limiting groove and the roller bearing seat.
A rolling method of a battery pole piece is realized by the battery pole piece hot rolling equipment, and comprises the following specific steps:
step 1, unwinding a pole piece through an unwinding system;
step 3, pre-cutting the pole piece;
step 4, pre-rolling the pole piece in a first roller machine;
and 5, after passing through the transition roller, the pole piece enters a second roller machine to be rolled.
and 7, starting an electro-hydraulic servo device of the equipment, respectively adjusting the first roller and the second roller, and continuing the step 6 after the adjustment is finished until the pole piece is rolled.
And 8, rolling the rolled pole piece.
The invention adopts the technical scheme to produce the beneficial effects that:
the device of the invention adopts a multi-stage rolling device, each stage of rolling device consists of a pressing and balance adjusting device, and the working device consists of a plurality of rollers. The rolling device draft is adjusted through the electro-hydraulic servo device, the rolling precision is improved, and the roller state is timely modified and adjusted in the rolling process. The supporting rollers apply pressure to the two ends of the working roller, so that the deformation of the roller under the rolling force in the rolling process is reduced, and further the influence on the thickness consistency of the pole piece is reduced. The working roller adopts a heat conduction oil heating mode to carry out hot rolling on the pole piece, so that a pole piece coating is softened, the stress concentration of the pole piece is greatly reduced, the material particle breakage caused by overlarge rolling reduction is avoided, and the resilience of the pole piece is reduced. The working roll adopts a double-layer structure with a matched roll core and a roll sleeve, the surface of the roll sleeve is subjected to high wear resistance, and the service life of the roll surface is prolonged. The roller core surface layer selects the spiral oil duct to heat the working roller, so that the temperature consistency of the roller surface of the working roller is improved, the heating time of the roller is shortened, the oil duct is convenient to clean, and the heating efficiency is improved. After the surface of the working roll deforms, the roll sleeve of the working roll can be directly replaced, and the roll core continues to be in service, so that the thickness consistency of pole piece production is ensured, the reliability of equipment is improved, the service life of the equipment is prolonged, and the cost in the use process is reduced. The multi-stage rolling device adopts a multi-pass different-rolling-amount hot rolling device, the consistency of the thickness of the pole piece is improved through multi-pass rolling,
furthermore, the application provides a rolling method of the battery pole piece based on the rolling device, which comprises the following steps: the pole piece is preheated, so that the raw material of the pole piece is softened, the stress concentration of the pole piece in the rolling process is reduced, and the conditions of particle breakage and the like after rolling are met. The pole pieces are rolled in multiple passes step by step, so that the pole pieces can be rolled under the working condition of smaller rolling force, the thickness consistency of the pole pieces is improved, the electrode structure is improved, and the deformation of the roll surface of the working roll is reduced. The rolled pole piece is detected by the thickness gauge, and if the consistency of the pole piece is poor, the roller is adjusted by the multistage rolling device through the pressing and balance adjusting device, the temperature of the working roller and the rolling speed are adjusted according to conditions, so that the consistency of the thickness of the pole piece is adjusted in the rolling process, the production cost is reduced, and the production efficiency is improved.
Drawings
FIG. 1 is a schematic structural diagram of a battery pole piece rolling device provided by the invention;
FIG. 2 is a schematic side view of a battery pole piece rolling device according to the present invention;
FIG. 3 is a schematic structural view of a heat transfer oil heating rolling working roll provided by the present invention;
FIG. 4 is a schematic diagram of a working structure of a battery pole piece rolling method provided by the present invention;
FIG. 5 is a flow chart of the working process of the rolling method of the battery pole piece provided by the invention.
Detailed Description
The invention provides a battery pole piece hot rolling device and a rolling method, which are used for solving the problems that a roller is easy to deform, the rolling reduction is adjusted, the roller is heated, the thickness uniformity and consistency of a pole piece are poor, the electrode structure is poor and the like in the rolling process of the conventional pole piece rolling device.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
With the development of new energy field, higher requirements are put forward on the specific energy, the service life, the safety and the price of the lithium ion battery. The rolling process is used as the most critical step in the production of the pole piece, and the rolling of the pole piece directly influences the performance of the battery pole piece. Along with the development of pole piece production, the rolling width of the pole piece is increased, and the width of the roller surface of the roller is also increased. The existing rolling equipment mostly adopts a two-roll cold rolling mill for rolling, a roller directly receives rolling force, the stress is uneven, the roller surface is easy to deform, the loss of the roller is large, and the equipment cost is increased. The phenomenon of uneven thickness of the pole piece results in substandard consistency of the thickness of the pole piece, and the performance of the pole piece is influenced.
A battery pole piece hot rolling device comprises a driving assembly, a transmission assembly and a rolling assembly; the rolling assembly mainly comprises a first roller machine 41 and a second roller machine 42; the first roller 41 and the second roller 42 are both fixed on the machine base 20, and the roll gap of the first roller 41 is opposite to the roll gap of the second roller 42; the first roller 41 and the second roller 42 respectively comprise a frame, a hydraulic balance device, an electro-hydraulic servo device, a roller group and a roller bearing seat provided with a roller end part;
the stand is two opposite vertical plates arranged on the base 20; a limiting groove is formed in the middle of the vertical plate;
the roll set mainly comprises two supporting rolls and two working rolls, and the working rolls and the supporting rolls are parallel in pairs; the roll bearing blocks at the two ends of the supporting roll and the working roll are respectively arranged in the limiting grooves of the corresponding vertical plates, and each roll bearing block can move up and down along the limiting groove of the corresponding vertical plate; between the two vertical plates, an upper supporting roller, an upper working roller, a lower working roller and a lower supporting roller are sequentially arranged from top to bottom, and the adjacent supporting rollers and the working rollers are tightly attached; the electro-hydraulic servo device comprises an upper hydraulic telescopic rod and a lower hydraulic telescopic rod; the fixed end of the upper hydraulic telescopic rod is fixedly arranged on the top wall in the limiting groove, and the action end of the upper hydraulic telescopic rod is connected to the top of the roller bearing seat corresponding to the upper supporting roller through an upper hydraulic balancing device; the fixed end of the lower hydraulic telescopic rod is fixedly arranged on the bottom surface in the limiting groove, and the action end of the lower hydraulic telescopic rod is connected to the bottom of the corresponding roller bearing seat of the lower supporting roller through a lower hydraulic balancing device;
the driving assembly drives the supporting roll to rotate through the transmission assembly, and the supporting roll drives the working roll to rotate through friction force.
Furthermore, a transition roller with adjustable height is arranged between the first roller machine and the second roller machine; the transition roller is parallel to the support roller and the working roller.
Further, the hydraulic balance device comprises two L-shaped plates and an I-shaped seat; the movable end of the hydraulic telescopic rod is connected to the I-shaped seat; two short branch sections of the two L-shaped plates are respectively positioned in connecting grooves at two sides of the I-shaped seat, and two corresponding long branch sections of the two L-shaped plates are respectively clung to two side walls of the limiting groove; the two L-shaped plates are mirror-symmetrical.
Further, the driving assembly is a speed reducing motor 1, and the transmission assembly comprises a universal spindle 2, a worm balancing device 3 and a coupler 4; the output end of the speed reducing motor 1 is connected with the drive end of the supporting roller through a corresponding universal shaft 2 and a corresponding coupler 4; the universal spindle 2 realizes stable transmission through the worm balancing device 3.
Further, the work roll includes a roll core 45 and a roll shell 47; the surface of the roller core 45 of the working roller is provided with a spiral oil duct 46 with a spiral line structure; the input section and the output section of the spiral oil duct both penetrate through the central axis of the working roller; the surface layer of the roller sleeve 47 of the working roller is subjected to surface strengthening treatment.
Furthermore, a sliding plate is arranged between the limiting groove and the roller bearing seat.
A rolling method of a battery pole piece is realized by the battery pole piece hot rolling equipment, and comprises the following specific steps:
step 1, unwinding a pole piece through an unwinding system 49;
step 3, pre-cutting the pole piece;
step 4, pre-rolling the pole piece in a first roller machine;
and 5, after passing through the transition roller, the pole piece enters a second roller machine to be rolled.
and 7, starting an electro-hydraulic servo device of the equipment, respectively adjusting the first roller and the second roller, and continuing the step 6 after the adjustment is finished until the pole piece is rolled.
And 8, rolling the rolled pole piece.
The following are more specific examples:
referring to fig. 1 to 3, the present example includes: a speed reducing motor 1, a universal spindle 2, a worm balancing device 3, a coupler 4, a hydraulic platform 5, a first pressing motor 6, a first electro-hydraulic servo device 7, a first speed measuring sensor 8, a first upper hydraulic telescopic rod 9, a first upper hydraulic balancing device 10, a first upper support roller 11, a first upper support roller bearing seat 12, a first upper working roller 13, a first upper working roller bearing seat 14, a first lower working roller 15, a first lower working roller bearing seat 16, a first lower support roller 17, a first lower support roller bearing seat 18, a first machine frame 19, a machine base 20, a first lower hydraulic balancing device 21, a first lower hydraulic telescopic rod 22, a sliding plate 23, a second pressing motor 24, a second electro-hydraulic servo device 25 and a second speed measuring sensor 26, a second upper hydraulic telescopic rod 27, a second upper hydraulic balancing device 28, a second upper supporting roll chock 29, a second upper supporting roll 30, a second upper working roll 31, a second upper working roll chock 32, a second lower working roll 33, a second lower working roll chock 34, a second lower supporting roll 35, a second lower supporting roll chock 36, a second lower hydraulic balancing device 37, a second lower hydraulic telescopic rod 38, a second hydraulic press platform 39, a second machine frame 40, a first roller 41, a second roller 42, a transition roller 43, a central oil passage 44, a roller core 45, a spiral oil passage 46, a roller sleeve 47, a rotary joint 48, an unreeling system 49, a dust removing device 50, a pre-cutting device 51, a thickness measuring instrument 52, a battery pole piece 53, and a reeling mechanism 54.
Example 1 of the invention, a battery pole piece hot rolling apparatus as shown in figures 1 to 3,
in the hot rolling device for battery pole pieces in this embodiment 1, the device is composed of a multi-stage rolling device. The multi-stage rolling is respectively a first roller machine 41 and a second roller machine 42. The first roller machine 41 and the second roller machine 42 are the same and are connected by the machine base 20, and the first roller machine 41 and the second roller machine 42 have different first roller gaps and second roller gaps. The first roller machine 41 and the second roller machine 42 respectively comprise 4 rollers and roller bearing blocks thereof, an electro-hydraulic servo device and a hydraulic balance device, wherein the rollers are respectively a first upper supporting roller 11, a first upper working roller 13, a first lower working roller 15, a first lower supporting roller 17, a second upper supporting roller 30, a second upper working roller 31, a second lower working roller 33 and a second lower supporting roller 35.
The first upper supporting roll 11 is fixed on a sliding plate 23 of the first frame 19 through a first upper supporting roll bearing seat 12, the first upper working roll 13 is fixed on the sliding plate 23 of the first frame 19 through a first upper working roll bearing seat 14, the first lower working roll 15 is fixed on the sliding plate 23 of the first frame 19 through a first lower working roll bearing seat 16, the first lower supporting roll 17 is fixed on the sliding plate 23 of the first frame 19 through a first lower supporting roll bearing seat 18, the second upper supporting roll 30 is fixed on the sliding plate 23 of the second frame 40 through a second upper supporting roll bearing seat 29, the second upper working roll 31 is fixed on the sliding plate 23 of the second frame 40 through a second upper working roll bearing seat 32, the second lower working roll 33 is fixed on the sliding plate 23 of the second frame 40 through a second lower working roll bearing seat 34, and the second lower supporting roll 35 is fixed on the sliding plate 23 of the second frame 40 through a second lower supporting roll bearing seat 36. The first upper working roll bearing seat 14 and the first lower working roll bearing seat 16 are arranged on the first frame 19 in a lifting way and are used for adjusting the roll gap of the floating working roll, and the second upper working roll bearing seat 32 and the second lower working roll bearing seat 34 are arranged on the second frame 40 in a lifting way.
The supporting device is composed of a first upper supporting roll 11 of a first roll machine 41, a first lower supporting roll 17, a first upper supporting roll bearing seat 12, a first lower supporting roll bearing seat 18, a second upper supporting roll 30 of a second roll machine 42, a second lower supporting roll 35, a second upper supporting roll bearing seat 29 and a second lower supporting roll bearing seat 36, wherein the first upper supporting roll bearing seat 12 and the first lower supporting roll bearing seat 18 can be arranged on the first roll machine 41 in a lifting and moving mode, and the second upper working roll bearing seat 32 and the second lower working roll bearing seat 34 are arranged on a second rack 40 in a lifting and moving mode. The speed reducing motor 1 is connected with the coupler 4 through the universal shaft 2, and the coupler 4 is fixed on the first upper supporting roller 11, the first lower supporting roller 17, the second upper supporting roller 30 and the second lower supporting roller 35. First upper supporting roller 11, first lower supporting roller 17, supporting roller 30 on the second, second lower supporting roller 35 is rotatory through universal joint 2 and shaft coupling 4 drive backing roller by gear motor 1, first upper supporting roller 11, first lower supporting roller 17 drives first upper working roller 13, first lower working roller 15 is rotatory, supporting roller 30 on the second, second lower supporting roller 35 drives second upper working roller 31, second lower working roller 33 is rotatory, realize the roll-in motion of working roller to the pole piece. In the pole piece rolling process, the battery pole piece is rolled for the first time through a roll gap formed between the first upper working roll 13 and the first lower working roll 15, the rolled pole piece is subjected to position adjustment and tension adjustment through the transition roll 43, and then the battery pole piece is rolled for the second time through a roll gap formed between the second upper working roll 31 and the second lower working roll 33. In the rolling process, the rolling reduction of the pole piece is adjusted by adjusting the first electro-hydraulic servo device 7 and the second electro-hydraulic servo device 25.
The first electro-hydraulic servo device 7 is composed of a hydraulic platform 5, a first pressing motor 6, a first speed measuring sensor 8 and a first upper hydraulic telescopic rod 9. The second electro-hydraulic servo device 25 consists of a second hydraulic platform 39, a second screw-down motor 24, a second speed sensor 26 and a second upper hydraulic telescopic rod 27, and the roll balancing device consists of a first upper hydraulic balancing device 10, a first lower hydraulic balancing device 21, a second upper hydraulic balancing device 28 and a second lower hydraulic balancing device 37. The hydraulic balancing device is composed of a balance adjusting platform and a hydraulic oil cylinder, the hydraulic platform is used for adjusting the hydraulic oil cylinder to enable the hydraulic platform to be in contact with and apply pressure to a first upper supporting roll bearing seat 12, a first lower supporting roll bearing seat 18, a second upper supporting roll bearing seat 29 and a second lower supporting roll bearing seat 36, in the pole piece rolling process, a first upper working roll 13 and a first lower working roll 15 are arranged between rolling pole pieces between a second upper working roll 31 and a second lower working roll 33, the roll surfaces of the working rolls are deformed due to the influence of a reaction force, the first upper supporting roll 11 and the first lower supporting roll 17 offset the stress deformation generated by the first upper working roll 13 and the first lower working roll 15, the second upper supporting roll 30 and the second lower supporting roll 35 offset the stress deformation generated by the second upper working roll 31 and the second lower working roll 33, and the first upper hydraulic balancing device 10 and the first lower hydraulic balancing device 21 offset the stress deformation generated by the first upper supporting roll 12 and the first lower working roll 18 through the hydraulic oil cylinder in the hydraulic oil cylinder rolling process by using the hydraulic supporting platform, the second upper hydraulic balancing device 28 and the second upper supporting roll bearing seat 36 and the hydraulic oil cylinder to offset the second lower hydraulic balancing device in the second lower supporting roll bearing seat 29 and the hydraulic oil cylinder in the rolling process by adjusting hydraulic oil cylinder.
The structure on the first frame 19 comprises a first upper working roll 13, a first lower working roll 15, a first upper working roll bearing seat 14 and a first lower working roll bearing seat 16, and the structure on the second frame 40 comprises a second upper supporting roll 30, a second upper working roll 31, a second lower working roll 33 and a second lower supporting roll 35. As shown in fig. 3, the working roll is a double-layer structure consisting of a central oil passage 44 of the working roll, a core 45 of the working roll, a spiral oil passage 46 of the working roll and a sleeve 47 of the working roll, and the core 45 of the working roll and the sleeve 47 of the working roll are assembled by a hot extrusion method. The working roll utilizes the spiral oil duct 46 to feed heat-conducting oil to heat the working roll, the two ends of the working roll are provided with the rotary joints 48, the heat-conducting oil enters the oil duct of the working roll through the central oil duct 44 of the port of the working roll, the spiral oil duct 46 is uniformly arranged, and the consistent deformation of the roll core caused by heating is ensured. The roller core 45 is assembled with the roller sleeve 47, so that the surface of the roller is rapidly heated, and only the roller sleeve 47 can be replaced after the surface of the roller is deformed under the influence of thermal deformation and rolling force, the roller core 45 can be continuously used, and the use cost is reduced. Spiral oil duct 46 adopts the circular arc formula design, can effectively disperse the stress that the thermal deformation produced, reduces roller shell 47 heat altered, improves life.
In other embodiments of the present disclosure, the diameters of the first upper working roll 13, the first lower working roll 15, the second upper working roll 31, and the second lower working roll 33 are 500 to 900mm, the diameters of the first upper supporting roll 11, the first lower supporting roll 17, the second upper supporting roll 30, and the second lower supporting roll 35 are 1200 to 1800mm, and the diameters of the first upper supporting roll 11, the first lower supporting roll 17, the second upper supporting roll 30, and the second lower supporting roll 35 are larger than the diameters of the first upper working roll 11, the first lower working roll 15, the second upper working roll 31, and the second lower working roll 33.
The first upper working roll 13, the first lower working roll 15, the second upper working roll 31 and the second lower working roll 33 are of a double-layer structure with a roll core 45 and a roll sleeve 47 matched, and the surface of the roll sleeve 47 is subjected to wear-resistant strengthening treatment. The hardness of the material of the roll surface of the first upper support roll 11, the first lower support roll 17, the second upper support roll 30 and the second lower support roll 35 is lower than that of the material of the roll surface of the working roll in contact with the first upper support roll 11, the first lower support roll 17 and the second upper support roll 30. The first upper supporting roller 11, the first lower supporting roller 17, the second upper supporting roller 30 and the second lower supporting roller 35 are not in contact with the rolled battery pole piece 53, and the supporting rollers are used for applying pressure to the working roller so as to reduce the influence of the deformation of the working roller on the thickness consistency of the rolled pole piece. In this embodiment, the first upper working roll 13, the first lower working roll 15, the second upper working roll 31, and the second lower working roll 33 are a double-layer structure with a roll core 45 and a roll sleeve 47 matched with each other, the surface is made of a high-strength wear-resistant material, the surface of the roll sleeve 47 is subjected to laser strengthening treatment, and the hardness of the material is higher than the strength of the roll surface of the supporting roll, so that the first upper working roll 13, the first lower working roll 15, the second upper working roll 31, and the roll surface of the second lower working roll 33 are damaged, the reliability and the service life of the device are increased, the cost in the use process is reduced, the thickness consistency of rolled pole pieces is improved, and the electrode structure is improved.
In this embodiment, the first upper support roll 11 and the first lower support roll 17 are respectively disposed on the first frame 19 through the first upper support roll chock 12 and the first lower support roll chock 18, the first upper support roll 11 and the first lower support roll 17 can be lifted along the first frame 19 according to the rolling requirement, the second upper support roll 30 and the second lower support roll 35 are respectively disposed on the second frame 40 through the second upper support roll chock 29, the second lower support roll chock 36 is disposed on the second frame 40, the second upper support roll 30 and the second lower support roll 35 can be lifted along the second frame 40 according to the rolling requirement. The positions of the first upper supporting roll 11, the first lower supporting roll 17, the second upper supporting roll 30 and the second lower supporting roll 35 are adjusted according to the rolling pole piece condition, so that a first roll gap between the first upper working roll 13 and the first lower working roll 15, a second roll gap between the second upper working roll 31 and the second lower working roll 33 are adjusted, a first roll gap and a second roll gap are respectively formed between the first upper working roll 13 and the first lower working roll 15 and between the second upper working roll 31 and the second lower working roll 33, and the first roll gap is larger than or equal to the second roll gap. After the pole piece is rolled through the first roll gap, the position and the tension of the rolled pole piece are adjusted through the transition roller 43, and then the pole piece enters the second roll gap to be rolled for the second time. The realization is to the multi-pass roll-in of pole piece, through roll-in step by step, can make rolling force reduce, reduces roll surface deformation, improves pole piece thickness uniformity, reduces pole piece stress concentration.
In this embodiment, the first upper working roll 13, the first lower working roll 15, the second upper working roll 30, and the second lower working roll 35 are a double-layer structure in which a roll core 45 and a roll sleeve 47 are matched, a central oil passage 44 is processed at the axis of a roll neck of the roll core 45, a spiral oil passage 46 is arranged on the roll surface of the roll core 45, the spiral oil passage 46 is communicated with the central oil passage 44 of the roll core 45, and externally heated heat transfer oil enters the central oil passage 44 of the roll core 45 through a rotary joint 48, flows into the spiral oil passage 46 of the roll core 45, and heats the roll sleeve 47. An external heat conduction oil pipe is connected with a rotary joint 48, the rotary joint 48 is connected with a central oil duct 44 of the roller core 45, the central oil duct 44 is connected with a spiral oil duct 46 on the surface of the roller core 45 and the central oil duct 44, the spiral oil ducts 46 of the roller core 45 are uniformly arranged, the consistent thermal deformation of the roller core 45 is guaranteed, and the service life is prolonged. The spiral oil passage 46 is designed in an arc shape, so that stress generated by thermal deformation can be effectively dispersed, thermal deformation of the roller core 45 is reduced, and the service life is prolonged. The roller sleeve 47 is assembled with the roller core 45, so that the surface of the roller is rapidly heated, and after the surface of the roller is deformed, only the roller sleeve 47 can be replaced, the roller core 45 can be continuously used after the surface of the roller is deformed due to thermal deformation and rolling force, the processing is convenient, the heat transfer is rapid, the uniformity of the surface temperature of the roller is improved, the use cost of the roller is reduced, the internal stress of a pole piece is eliminated, and the quality of the pole piece is improved.
In this embodiment, the unwinding system 49, the winding mechanism 54, and the transition roller 43 are used for pole piece tension adjustment during pole piece rolling, the unwinding system 49 adjusts tension before the pole piece enters the rolling device, the winding mechanism 54 adjusts tension after the pole piece is rolled, and the transition roller 43 is used for tension adjustment between the first rolling and the second rolling of the pole piece.
In the present embodiment, the axes of the first upper support roll 11, the first upper work roll 13, the first lower work roll 15, and the first lower support roll 17 are on the same plane and parallel to each other, and the axes of the second upper work roll 30, the second lower work roll 35, the second upper support roll 30, and the second lower support roll 35 are on the same plane and parallel to each other.
In embodiment 2, the invention provides a method for rolling a battery pole piece, which is implemented by rolling the pole piece in multiple passes through the battery pole piece hot rolling equipment in embodiment 1. Fig. 4 is a schematic diagram of a working structure of a rolling method for a battery pole piece according to the present invention, and fig. 5 is a flowchart of a working process of a rolling method for a battery pole piece according to the present invention. The specific embodiment comprises the following steps:
the pole piece is unreeled through the unreeling system 49.
The pole piece is subjected to dust removal cleaning through a dust removal device and is preheated through a drying box.
And carrying out pre-cutting treatment on the pole piece.
And (4) carrying out pre-rolling on the pole piece by using a first-stage hot rolling device.
And (4) after passing through the transition roller, the pole piece enters a second-stage hot rolling device to be finally rolled.
The pole piece passes through thickness meter 47, and the condition that the thickness uniformity is poor appears in the pole piece along the width direction after the pole piece rolls is judged.
And starting a pressing-down adjusting device and a balance adjusting device of the rolling device, adjusting each stage of rolling device, adjusting the temperature and the rolling speed of the working roll, and performing rolling after the thickness measurement is qualified after the adjustment is finished.
Specifically, in the rolling process, the rolling reduction of the pole piece is adjusted by adjusting an electro-hydraulic servo device, and a first electro-hydraulic servo device 7 consists of a hydraulic platform 5, a first reduction motor 6, a first speed measurement sensor 8 and a first upper hydraulic telescopic rod 9. The second electro-hydraulic servo device 25 is composed of a second hydraulic platform 39, a second screw-down motor 24, a second speed sensor 26 and a second upper hydraulic telescopic rod 27, and the roller balancing device is composed of a first upper hydraulic balancing device 10, a first lower hydraulic balancing device 21, a second upper hydraulic balancing device 28 and a second lower hydraulic balancing device 37. The hydraulic balancing device consists of a balance adjusting platform and a hydraulic oil cylinder, and the hydraulic platform contacts and applies pressure to the first upper supporting roller bearing seat 12, the first lower supporting roller bearing seat 18, the second upper supporting roller bearing seat 29 and the second lower supporting roller bearing seat 36 by adjusting the hydraulic oil cylinder.
And finishing pole piece rolling, and rolling the rolled pole piece.
The above embodiments describe in detail the battery pole piece hot rolling apparatus and method provided in the embodiments of the present invention, and these embodiments are only used to illustrate the technical solution of the present invention, and are not limited thereto. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (7)
1. A battery pole piece hot rolling device comprises a driving assembly, a transmission assembly and a rolling assembly; the rolling assembly is characterized by mainly comprising a first roller machine (41) and a second roller machine (42); the first roller machine (41) and the second roller machine (42) are fixed on the machine base (20), and the roller gap of the first roller machine (41) is opposite to the roller gap of the second roller machine (42); the first roller machine (41) and the second roller machine (42) respectively comprise a rack, a hydraulic balance device, an electro-hydraulic servo device, a roller group and a roller bearing seat provided with a roller end part;
the stand is two vertical plates which are arranged on the stand (20) and are opposite; a limiting groove is formed in the middle of the vertical plate;
the roll set mainly comprises two supporting rolls and two working rolls, and the working rolls and the supporting rolls are parallel in pairs; the roll bearing blocks at the two ends of the supporting roll and the working roll are respectively arranged in the limiting grooves of the corresponding vertical plates, and each roll bearing block can move up and down along the limiting groove of the corresponding vertical plate; between the two vertical plates, an upper supporting roller, an upper working roller, a lower working roller and a lower supporting roller are sequentially arranged from top to bottom, and the adjacent supporting rollers and the working rollers are tightly attached; the electro-hydraulic servo device comprises an upper hydraulic telescopic rod and a lower hydraulic telescopic rod; the fixed end of the upper hydraulic telescopic rod is fixedly arranged on the top wall in the limiting groove, and the action end of the upper hydraulic telescopic rod is connected to the top of the roller bearing seat corresponding to the upper supporting roller through an upper hydraulic balancing device; the fixed end of the lower hydraulic telescopic rod is fixedly arranged on the bottom surface in the limiting groove, and the action end of the lower hydraulic telescopic rod is connected to the bottom of the corresponding roller bearing seat of the lower supporting roller through a lower hydraulic balancing device;
the driving assembly drives the supporting roll to rotate through the transmission assembly, and the supporting roll drives the working roll to rotate through friction force.
2. The hot rolling equipment for the battery pole piece as claimed in claim 1, wherein a transition roller with adjustable height is further arranged between the first roller machine and the second roller machine; the transition roll is parallel to the support roll and the working roll.
3. The hot rolling equipment for the battery pole piece as claimed in claim 1, wherein the hydraulic balancing device comprises two L-shaped plates and a die holder; the movable end of the hydraulic telescopic rod is connected to the I-shaped seat; two short branch sections of the two L-shaped plates are respectively positioned in connecting grooves at two sides of the I-shaped seat, and two corresponding long branch sections of the two L-shaped plates are respectively clung to two side walls of the limiting groove; the two L-shaped plates are mirror-symmetrical.
4. The hot rolling equipment for the battery pole piece as claimed in claim 1, wherein the driving assembly is a speed reducing motor (1), and the transmission assembly comprises a universal shaft (2), a worm balancing device (3) and a coupling (4); the output end of the speed reducing motor (1) is connected with the driving end of the supporting roll through a corresponding universal coupling (2) and a coupling (4) respectively; the universal spindle (2) realizes stable transmission through the worm balancing device (3).
5. The battery pole piece hot rolling apparatus as recited in claim 1, wherein the work roll comprises a roll core (45) and a roll sleeve (47); the surface of a roller core (45) of the working roller is provided with a spiral oil duct (46) with a spiral line structure; the input section and the output section of the spiral oil duct (46) penetrate through the central axis of the working roll; the surface layer of the roller sleeve (47) of the working roller is subjected to surface strengthening treatment.
6. The hot rolling equipment for battery pole pieces as claimed in claim 1, wherein a sliding plate (23) is further provided between the limiting groove and the roll chock.
7. A rolling method of a battery pole piece is characterized by being realized by the hot rolling equipment of the battery pole piece, which comprises the following steps:
step 1, unwinding a pole piece through an unwinding system (49);
step 2, the pole piece is subjected to dust removal cleaning through a dust removal device, and is preheated through a drying oven;
step 3, pre-cutting the pole piece;
step 4, pre-rolling the pole piece in a first roller machine;
step 5, the pole piece passes through a transition roller and then enters a second roller machine for rolling the pole piece;
step 6, the pole piece passes through a thickness gauge, and if the consistency of the rolled pole piece in the width direction does not meet the standard, the step 7 is carried out; if the consistency of the rolled pole piece thickness along the width direction meets the standard, finishing pole piece rolling, and performing step 8;
step 7, starting an electro-hydraulic servo device of the equipment, respectively adjusting the first roller and the second roller, and continuing the step 6 after the adjustment is finished until the pole piece is rolled;
and 8, rolling the rolled pole piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211146726.7A CN115228931A (en) | 2022-09-21 | 2022-09-21 | Hot rolling equipment and method for battery pole piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211146726.7A CN115228931A (en) | 2022-09-21 | 2022-09-21 | Hot rolling equipment and method for battery pole piece |
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| CN115228931A true CN115228931A (en) | 2022-10-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211146726.7A Pending CN115228931A (en) | 2022-09-21 | 2022-09-21 | Hot rolling equipment and method for battery pole piece |
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| CN117619903A (en) * | 2024-01-25 | 2024-03-01 | 邢台纳科诺尔精轧科技股份有限公司 | Rolling control method and device |
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Application publication date: 20221025 |