CN116081370A - Pole piece feeding device, winding equipment and pole piece deviation correcting method - Google Patents

Pole piece feeding device, winding equipment and pole piece deviation correcting method Download PDF

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Publication number
CN116081370A
CN116081370A CN202310280573.3A CN202310280573A CN116081370A CN 116081370 A CN116081370 A CN 116081370A CN 202310280573 A CN202310280573 A CN 202310280573A CN 116081370 A CN116081370 A CN 116081370A
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China
Prior art keywords
pole piece
deviation rectifying
roller
deviation
feeding
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Granted
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CN202310280573.3A
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CN116081370B (en
Inventor
徐熙
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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Priority to CN202310280573.3A priority Critical patent/CN116081370B/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
    • B65H23/0204—Sensing transverse register of web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
    • B65H19/26—Cutting-off the web running to the wound web roll
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/02—Advancing webs by friction roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
    • B65H23/032—Controlling transverse register of web
    • B65H23/038—Controlling transverse register of web by rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/34—Apparatus for taking-out curl from webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H26/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms
    • B65H26/06—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms responsive to predetermined lengths of webs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/11—Dimensional aspect of article or web
    • B65H2701/113—Size
    • B65H2701/1133—Size of webs
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)

Abstract

The application discloses a pole piece feeding device, winding equipment and a pole piece deviation rectifying method. The pole piece feeding device comprises an unreeling mechanism and a first deviation rectifying mechanism. The unreeling mechanism is used for setting the pole piece. The first deviation rectifying mechanism is configured to: starting to feed the pole piece, stopping correcting the deviation by the first deviation correcting mechanism before the feeding length of the pole piece reaches a preset length; and after the feeding length of the pole piece reaches the preset length, correcting the pole piece by the first correcting mechanism.

Description

Pole piece feeding device, winding equipment and pole piece deviation correcting method
Technical Field
The application relates to the field of battery production, in particular to a pole piece feeding device, winding equipment and a pole piece deviation correcting method.
Background
Battery cells are widely used in electronic devices such as cellular phones, notebook computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy vehicles, electric toy ships, electric toy airplanes, electric tools, and the like.
In the production process of the battery cell, it is necessary to wind the electrode sheet and the separator to manufacture an electrode assembly of the battery cell. How to improve the reliability of the battery cell is an important research direction in battery production.
Disclosure of Invention
The utility model provides a pole piece material feeding unit, winding equipment and pole piece method of rectifying, it can reduce the mistake of pole piece and rectify, reduces the risk that the pole piece is wrinkled, improves the reliability of battery monomer.
In a first aspect, the present application provides a pole piece feeding device, which includes an unreeling mechanism and a first deviation rectifying mechanism. The unreeling mechanism is used for setting the pole piece. The first deviation rectifying mechanism is configured to: starting to feed the pole piece, stopping correcting the deviation by the first deviation correcting mechanism before the feeding length of the pole piece reaches a preset length; and after the feeding length of the pole piece reaches the preset length, correcting the pole piece by the first correcting mechanism.
The head area with smaller tension of the pole piece can pass through the first deviation rectifying mechanism, and the first deviation rectifying mechanism does not rectify the pole piece in a section of length of the pole piece starting to feed, so that error deviation rectifying actions of the first deviation rectifying mechanism due to edge collapse of the head area are reduced. When the feeding length of the pole piece exceeds the preset length, the head area of the pole piece is basically wound to the target position, the pole piece collapses to a small extent under the action of tension, the first deviation correcting mechanism can be normally started, the pole piece is corrected in real time, the winding alignment degree of the pole piece is improved, the risk of pole piece wrinkling is reduced, and the reliability of the battery monomer is improved.
In some embodiments, the first deviation rectifying mechanism includes oppositely disposed first and second rollers, the pole piece configured to pass between the first and second rollers. The first roller and the second roller are used for clamping the pole piece and driving the pole piece to move in the axial direction of the first roller.
When the correction is required to be carried out on the pole piece, the first roller and the second roller can clamp the pole piece and drive the pole piece to translate; in the pole piece translation process, the first roller and the second roller compress the pole piece from both sides, under the effect of pressure, the frictional force between the pole piece and the first roller can reduce the relative slip between the pole piece and the first roller, and the frictional force between the pole piece and the second roller can reduce the relative slip between the pole piece and the second roller, thereby improving the reaction efficiency of rectifying.
In some embodiments, the first deviation rectifying mechanism further comprises a first sensor disposed upstream of the first roller and configured to sense the position of the pole piece in the axial direction.
The state of the pole piece can be detected in real time through the arrangement of the first sensor, and the pole piece is rectified in real time according to the state of the pole piece, so that the alignment degree of pole piece winding is improved, the risk of pole piece wrinkling is reduced, and the reliability of the battery cell is improved.
In some embodiments, the first deviation rectifying mechanism further comprises a bracket and a first driver. The first roller and the second roller are rotatably connected to the bracket. The first driver is used for driving the bracket to move along the axial direction. When the pole piece is required to be rectified, the first driver can drive the first roller and the second roller to synchronously move through the support, so that the pole piece is rectified.
In some embodiments, the first deviation correcting mechanism further comprises a second driver for driving the first roller to rotate. When the pole piece needs to be fed, the second driver can drive the first roller to rotate, so that the first roller and the second roller drive the pole piece to move into the pole piece.
In some embodiments, the levelness of the first roller is less than or equal to 5 μm to improve the accuracy of the correction of the pole piece.
In some embodiments, the levelness of the second roller is less than or equal to 5 μm to improve the correction accuracy of the pole piece.
In some embodiments, the pole piece feeding device further comprises a measuring mechanism for measuring the feed length of the pole piece. The measuring mechanism can measure the feeding length of the pole piece in real time so as to switch the start-stop state of the first deviation correcting mechanism.
In some embodiments, the measurement mechanism includes an encoder. The encoder can convert the measured feeding length into a signal, so that data transmission can be realized conveniently.
In some embodiments, the pole piece feeding device further comprises a controller, the controller being connected to the measuring mechanism and the first deviation rectifying mechanism.
The controller can receive the feeding length signal measured by the measuring mechanism and compare the feeding length of the pole piece with the preset length; when the feeding length is smaller than or equal to the preset length, the controller controls the first deviation correcting mechanism so that the first deviation correcting mechanism is in a stop state; when the feeding length is greater than the preset length, the controller controls the first deviation rectifying mechanism to enable the first deviation rectifying mechanism to start and start rectifying the pole piece.
In some embodiments, the pole piece feeding device further comprises a second deviation rectifying mechanism. The second deviation rectifying mechanism is arranged between the first deviation rectifying mechanism and the unreeling mechanism and is configured to rectify the pole piece after the pole piece starts feeding.
The second deviation rectifying mechanism is far away from the head area of the pole piece, the collapse degree of the pole piece at the second deviation rectifying mechanism is small, and the second deviation rectifying mechanism can rectify the pole piece from the beginning of pole piece feeding, so that the alignment degree of pole piece winding is improved. The first deviation rectifying mechanism and the second deviation rectifying mechanism rectify the deviation at a plurality of positions of the pole piece so as to reduce the offset of the pole piece in the feeding process, improve the reliability of the battery cell and prolong the service life of the battery cell.
In a second aspect, the present application provides a winding apparatus comprising the pole piece feeding device of any one of the embodiments of the first aspect and a winding needle. The winding needle is used for winding the pole piece conveyed by the pole piece feeding device.
In some embodiments, the minimum distance between the first deviation rectifying mechanism and the winding needle is less than a preset length.
When the winding needle starts to wind the pole piece, the pole piece can be flattened under the driving of the winding needle, so that the phenomenon of edge collapse is reduced. According to the technical scheme, the first deviation rectifying mechanism can be started after the pole piece enters the winding needle, so that error deviation rectifying actions of the first deviation rectifying mechanism are reduced.
In some embodiments, the winding apparatus further comprises a cutter positioned between the winding needle and the first deviation rectifying mechanism. After the electrode assembly is wound and formed, the cutter can cut off the pole piece.
In a third aspect, the present application provides a pole piece deviation rectifying method, which includes:
starting feeding of the pole piece passing through the first deviation correcting mechanism;
starting to feed the pole piece, stopping correcting the deviation by the first deviation correcting mechanism before the feeding length of the pole piece reaches a preset length;
and after the feeding length of the pole piece reaches the preset length, correcting the pole piece by the first correcting mechanism.
The head area with smaller tension of the pole piece can pass through the first deviation rectifying mechanism, and the first deviation rectifying mechanism does not rectify the pole piece in a section of length of the pole piece starting to feed, so that error deviation rectifying actions of the first deviation rectifying mechanism due to edge collapse of the head area are reduced. When the feeding length of the pole piece exceeds the preset length, the head area of the pole piece is basically wound to the target position, the pole piece collapses to a small extent under the action of tension, the first deviation correcting mechanism can be normally started, the pole piece is corrected in real time, the winding alignment degree of the pole piece is improved, the risk of pole piece wrinkling is reduced, and the reliability of the battery monomer is improved.
In some embodiments, the predetermined length is 20mm-500mm. The preset length L is limited to be 20-500 mm, so that error correction actions of the first correction mechanism are reduced, deviation of the pole piece is reduced, and the risk of pole piece wrinkling is reduced.
In some embodiments, the predetermined length is 50mm-150mm. Limiting the preset length L to 50-150 mm can further reduce error correction actions of the first correction mechanism, reduce offset of the pole piece and reduce the risk of pole piece wrinkling.
In some embodiments, the pole piece deviation rectifying method further comprises: setting a preset length; calculating the feeding length of the pole piece from the beginning of feeding the pole piece; and comparing the feeding length of the pole piece with a preset length.
The start and stop of the first deviation correcting mechanism are switched by comparing the feeding length with the preset length, so that the error deviation correcting action of the first deviation correcting mechanism is reduced.
In some embodiments, the step of starting feeding the pole piece passing through the first deviation rectifying mechanism includes: and starting feeding of the pole pieces sequentially passing through the second deviation correcting mechanism and the first deviation correcting mechanism. The pole piece deviation rectifying method further comprises the following steps: and the second deviation rectifying mechanism rectifies the pole piece after the pole piece starts feeding.
The second deviation rectifying mechanism is far away from the head area of the pole piece, the collapse degree of the pole piece at the second deviation rectifying mechanism is small, and the second deviation rectifying mechanism can rectify the pole piece from the beginning of pole piece feeding, so that the alignment degree of pole piece winding is improved. The first deviation rectifying mechanism and the second deviation rectifying mechanism rectify the deviation at a plurality of positions of the pole piece so as to reduce the offset of the pole piece in the feeding process, improve the reliability of the battery cell and prolong the service life of the battery cell.
Drawings
Features, advantages, and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.
FIG. 1 is a schematic illustration of a winding apparatus provided in some embodiments of the present application;
FIG. 2 is a schematic diagram of a first deviation rectifying mechanism of a pole piece feeding device according to some embodiments of the present disclosure;
FIG. 3 is another schematic view of a first deviation rectifying mechanism of a pole piece feeding device according to some embodiments of the present disclosure;
fig. 4 is a schematic block diagram of a pole piece deviation rectifying method provided in some embodiments of the present application.
In the drawings, the drawings are not necessarily to scale.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
The term "and/or" in this application is merely an association relation describing an associated object, and indicates that three relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In this application, the character "/" generally indicates that the associated object is an or relationship.
In the embodiments of the present application, the same reference numerals denote the same components, and in the interest of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the present application, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are illustrative only and should not be construed as limiting the present application in any way.
The term "plurality" as used herein refers to more than two (including two).
The battery monomer, such as lithium ion battery monomer, lithium sulfur battery monomer, sodium lithium ion battery monomer, sodium ion battery monomer or magnesium ion battery monomer, has the advantages of high energy density, high power density, multiple recycling times, long storage time and the like, and is widely applied to electric devices suitable for the battery monomer. For example, the electric device may be a vehicle, a cellular phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, or the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others.
The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive electrode plate, a negative electrode plate and a separation membrane. The battery cell mainly relies on metal ions to move between the positive pole piece and the negative pole piece to work. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive current collector comprises a positive current collecting region and a positive electrode lug protruding out of the positive current collecting region, the positive current collecting region is coated with a positive electrode active material layer, and at least part of the positive electrode lug is not coated with the positive electrode active material layer. Taking a lithium ion battery monomer as an example, the material of the positive electrode current collector can be aluminum, the positive electrode active material layer comprises a positive electrode active material, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate and the like. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector comprises a negative electrode current collecting region and a negative electrode tab protruding from the negative electrode current collecting region, wherein the negative electrode current collecting region is coated with a negative electrode active material layer, and at least part of the negative electrode tab is not coated with the negative electrode active material layer. The material of the anode current collector may be copper, the anode active material layer includes an anode active material, and the anode active material may be carbon or silicon, or the like. The material of the separator may be PP (polypropylene) or PE (polyethylene).
In some scenarios, the pole piece needs to be wound to form a preset morphology. The pole piece is usually in the form of a long strip, which is required to enter the material according to a preset track during the winding process. Due to the technical reasons, the pole piece may deviate in the continuous feeding process, so that the alignment degree of the edge of the pole piece after winding cannot meet the requirement, and the service life and reliability of the battery monomer are affected.
According to the embodiment of the application, the plurality of deviation rectifying mechanisms are arranged on the advancing path of the pole piece, and the plurality of deviation rectifying mechanisms can rectify deviation at a plurality of positions of the pole piece, so that the offset of the pole piece in the advancing process is reduced, and the reliability and the service life of a battery cell are improved. Illustratively, the deviation rectifying mechanism may determine whether to rectify the pole piece by detecting an amount by which an edge of the pole piece deviates from a set position, and rectify the pole piece by moving the pole piece.
The pole piece is generally subjected to a certain tension so that the pole piece is in a flattened state and enters the material along a preset track. Before entering the winding needle, the feeding free end of the pole piece is usually in a suspended state, so that the tension of a head area of the pole piece, which is close to the feeding free end, is small, and the edge of the head area can possibly collapse. The sagging of the head region will recover upon winding with less impact on the alignment of the pole piece winding.
When the pole piece starts to be fed, the deviation correcting mechanism can misjudge the position of the edge of the head area due to the collapse of the head area, so that the deviation correcting mechanism executes a misdeviation correcting action on the head area, the problems of wrinkling, insufficient alignment and the like of the pole piece after winding are caused, and the reliability of the battery monomer is affected.
In view of this, the embodiment of the application provides a technical scheme, and the start-stop time of the deviation rectifying mechanism is set to reduce the error correcting action of the deviation rectifying mechanism, reduce the risk of pole piece wrinkling and improve the reliability of the battery cell.
The technical scheme provided by the embodiment of the application can be used for winding an electrode assembly, but is not limited to the winding process, and can also be used for other processes needing to convey and wind the pole piece.
FIG. 1 is a schematic illustration of a winding apparatus provided in some embodiments of the present application; FIG. 2 is a schematic diagram of a first deviation rectifying mechanism of a pole piece feeding device according to some embodiments of the present disclosure; fig. 3 is another schematic diagram of a first deviation rectifying mechanism of the pole piece feeding device according to some embodiments of the present application.
Referring to fig. 1 to 3, a pole piece feeding device 2 of the embodiment of the present application includes an unreeling mechanism 21 and a first deviation rectifying mechanism 22. The unreeling mechanism 21 is used for setting the pole piece 1. The first deviation rectifying mechanism 22 is configured to: starting to feed the pole piece 1, stopping correcting the deviation by the first deviation correcting mechanism 22 before the feeding length of the pole piece 1 reaches the preset length; after the feeding length of the pole piece 1 reaches the preset length, the first deviation rectifying mechanism 22 rectifies the pole piece 1.
Illustratively, the unreeling mechanism 21 may be used to place a roll of pole pieces 1 and release the pole pieces 1 according to the feed requirements.
Illustratively, the unwind mechanism 21 may comprise an unwind roller. Alternatively, the unreeling roller can be a driving roller, in other words, when the pole piece 1 needs to be released, the unreeling roller can actively rotate under the drive of a motor; alternatively, the unreeling roller can be a passive roller, and can rotate under the drive of the pole piece 1 when the pole piece 1 needs to be released.
In the embodiment of the present application, the deviation correction may refer to: when the pole piece 1 deviates from the set position, the position of the pole piece 1 can be corrected, so that the alignment degree of the edge of the pole piece 1 after winding and forming is improved. Illustratively, during continuous travel of the pole piece 1, the widthwise edges of the pole piece 1 may deviate from the set position, at which time the deviation correcting mechanism may move the pole piece 1 in the widthwise direction of the pole piece 1 to return the edges of the pole piece 1 to the set position.
"from the beginning of feeding of the pole piece 1" may refer to the moment T1 when the pole piece 1 starts to move and feed. At time T1, pole piece 1 begins to move and advance to feed the winding needle or other component.
The feeding length of the pole piece 1 is counted from the moment when the pole piece 1 starts to enter the material. Illustratively, at time T1, point P1 of pole piece 1 is at first deviation rectifying mechanism 22; at the time T2, the point P2 of the pole piece 1 is positioned at the first deviation correcting mechanism 22; from time T1 to time T2, the feed length of pole piece 1 may be the length of a segment of pole piece 1 from P1 to P2.
Illustratively, the pole piece 1 provided by the unreeling mechanism 21 may be fed multiple times; for example, each time the pole piece 1 travels a certain length, it is necessary to perform cutting; the pole piece 1 may be one feeding cycle from the beginning of the feeding to the cutting. "from the beginning of the feeding of the pole piece 1" may refer to the moment when the pole piece 1 enters the material at the beginning of each feeding cycle.
Illustratively, the preset length may be L. When the feeding length of the pole piece 1 is less than or equal to L from the moment when the pole piece 1 starts to be fed, the first deviation rectifying mechanism 22 stops rectifying deviation; even if the first deviation rectifying mechanism 22 monitors that the deviation amount of the pole piece 1 is large, deviation rectifying is not performed. Starting from the moment when the pole piece 1 starts feeding, when the feeding length of the pole piece 1 is greater than L, the first deviation rectifying mechanism 22 starts to start, the advancing state of the pole piece 1 is monitored in real time, and when the deviation amount of the pole piece 1 exceeds a set value, the first deviation rectifying mechanism 22 rectifies the pole piece 1 in real time.
In the embodiment of the application, the head region with smaller tension of the pole piece 1 can pass through the first deviation rectifying mechanism 22, and the first deviation rectifying mechanism 22 does not rectify the pole piece 1 in a section of length of the pole piece 1 starting to feed, so that error deviation rectifying actions of the first deviation rectifying mechanism 22 due to edge collapse of the head region are reduced. When the feeding length of the pole piece 1 exceeds the preset length, the head area of the pole piece 1 is basically wound to the target position, the pole piece 1 is small in collapse degree under the action of tension, the first deviation correcting mechanism 22 can be normally started, the pole piece 1 is corrected in real time, the winding alignment degree of the pole piece 1 is improved, the risk of wrinkling of the pole piece 1 is reduced, and the reliability of a battery monomer is improved.
It is added here that at the moment the pole piece 1 starts to be fed, the pole piece 1 is already in the set position, and the alignment of its edges meets the requirements. The preset length is smaller, and the risk of larger deflection of the pole piece 1 in the process of travelling a small length is smaller; therefore, even in a section of the length of the pole piece 1 from which feeding is started, the first deviation rectifying mechanism 22 does not rectify the pole piece 1, and the alignment degree of the pole piece 1 can meet the requirement.
In some embodiments, the pole piece feed device 2 further comprises a second deviation rectifying mechanism 23. The second deviation rectifying mechanism 23 is arranged between the first deviation rectifying mechanism 22 and the unreeling mechanism 21, and the second deviation rectifying mechanism 23 is configured to rectify the pole piece 1 after the pole piece 1 starts feeding.
The embodiments of the present application do not limit the deviation rectifying manner of the deviation rectifying mechanism (e.g., the first deviation rectifying mechanism 22 and the second deviation rectifying mechanism 23). Illustratively, the deviation rectifying manner of the first deviation rectifying mechanism 22 may be the same as or different from that of the second deviation rectifying mechanism 23.
The second deviation rectifying mechanism 23 is disposed between the first deviation rectifying mechanism 22 and the unreeling mechanism 21, and means that: in the feeding process, the pole piece 1 provided by the unreeling mechanism 21 passes through the second deviation rectifying mechanism 23 and then passes through the first deviation rectifying mechanism 22. In other words, in the embodiment of the present application, the spatial position of the second deviation correcting mechanism 23 is not required to be located between the first deviation correcting mechanism 22 and the unreeling mechanism 21.
Starting from the moment when the pole piece 1 starts feeding, the second deviation rectifying mechanism 23 starts to start, the advancing state of the pole piece 1 is monitored in real time, and when the deviation amount of the pole piece 1 exceeds a set value, the second deviation rectifying mechanism 23 rectifies the pole piece 1 in real time.
The second deviation rectifying mechanism 23 is far away from the head area of the pole piece 1, the collapse degree of the pole piece 1 at the second deviation rectifying mechanism 23 is small, and the second deviation rectifying mechanism 23 can rectify the pole piece 1 from the beginning of feeding the pole piece 1, so that the winding alignment degree of the pole piece 1 is improved.
The first deviation rectifying mechanism 22 and the second deviation rectifying mechanism 23 rectify the deviation at a plurality of positions of the pole piece 1 so as to reduce the deviation of the pole piece 1 in the process of feeding the material, improve the reliability of the battery cell and prolong the service life of the battery cell.
In some embodiments, the first deviation rectifying mechanism 22 includes a first roller 221 and a second roller 222 disposed opposite to each other, and the pole piece 1 is configured to pass between the first roller 221 and the second roller 222. The first roller 221 and the second roller 222 are used for clamping the pole piece 1 and driving the pole piece 1 to move in the axial direction X of the first roller 221.
In some examples, the relative positions of the first roller 221 and the second roller 222 are fixed. The first roller 221 and the second roller 222 have smaller pressure on the pole piece 1, and do not influence the normal running of the pole piece 1. In other examples, the relative positions of the first roller 221 and the second roller 222 may also be adjustable. For example, the first roller 221 and the second roller 222 may be far from or near to each other to loosen or clamp the pole piece 1.
Illustratively, the axial direction of the second roller 222, the axial direction X of the first roller 221, and the width direction of the pole piece 1 are parallel.
When the correction is required to be carried out on the pole piece 1, the first roller 221 and the second roller 222 can clamp the pole piece 1 and drive the pole piece 1 to translate; in the process of translating the pole piece 1, the first roller 221 and the second roller 222 compress the pole piece 1 from two sides, under the action of pressure, the friction force between the pole piece 1 and the first roller 221 can reduce the relative sliding between the pole piece 1 and the first roller 221, and the friction force between the pole piece 1 and the second roller 222 can reduce the relative sliding between the pole piece 1 and the second roller 222, so that the reaction efficiency of deviation correction is improved.
In some embodiments, the roller surface of the first roller 221 may have elasticity, which may reduce the risk of the first roller 221 and the second roller 222 crushing the pole piece 1. Illustratively, the first roller 221 includes a first roller shaft and an elastic sleeve sleeved on the first roller shaft. Alternatively, the elastic sleeve may be made of rubber.
In some embodiments, the roller surface of the second roller 222 may have elasticity, which may reduce the risk of the first roller 221 and the second roller 222 crushing the pole piece 1. Illustratively, the second roller 222 includes a second roller shaft and an elastic sleeve sleeved on the second roller shaft. Alternatively, the elastic sleeve may be made of rubber.
In some embodiments, the first deviation rectifying mechanism 22 further comprises a first sensor 223, the first sensor 223 being arranged upstream of the first roller 221 and being adapted to sense the position of the pole piece 1 in the axial direction X.
Illustratively, the first sensor 223 may comprise a photosensor.
Illustratively, the first sensor 223 may determine the offset of the pole piece 1 by detecting the edge of the pole piece 1.
For example, as shown in fig. 3, the first sensor 223 may determine the amount of offset of the pole piece 1 by detecting the position of the lower edge 1a of the pole piece 1. Before feeding the pole piece 1, setting a deviation correction median D; the first sensor 223 detects a value D when the lower edge 1a of the pole piece 1 is in the set position. S can be an allowable offset, namely, when the distance of the lower edge 1a of the pole piece 1 deviating from the set position is less than or equal to S, no deviation correction is needed.
Specifically, when the lower edge 1a of the pole piece 1 is offset downward by the dimension S, the value detected by the first sensor 223 is d+s; when the lower edge 1a of the pole piece 1 is upwardly offset by the dimension S, the value detected by the first sensor 223 is D-S. When the value detected by the first sensor 223 is within (D-S) - (D + S), no correction is necessary; when the value detected by the first sensor 223 is less than (D-S) or greater than (d+s), the first roller 221 and the second roller 222 rectify the pole piece 1 so that the value detected by the first sensor 223 returns to within (D-S) - (d+s).
By arranging the first sensor 223, the state of the pole piece 1 can be detected in real time, and the pole piece 1 is rectified in real time according to the state of the pole piece 1, so that the winding alignment degree of the pole piece 1 is improved, the risk of wrinkling of the pole piece 1 is reduced, and the reliability of the battery cell is improved.
In some embodiments, first deviation correcting mechanism 22 also includes a bracket 224 and a first driver 225. The first roller 221 and the second roller 222 are rotatably connected to a bracket 224. The first driver 225 is used to drive the bracket 224 to move along the axial direction X.
When the correction is required to be performed on the pole piece 1, the first driver 225 can drive the first roller 221 and the second roller 222 to synchronously move through the bracket 224 so as to correct the correction on the pole piece 1.
In some embodiments, the first driver 225 includes a cylinder or a motor.
In some embodiments, the first deviation correcting mechanism 22 further includes a second driver 226, where the second driver 226 is configured to drive the first roller 221 to rotate.
When the pole piece 1 needs to be fed, the second driver 226 can drive the first roller 221 to rotate, so that the first roller 221 and the second roller 222 drive the pole piece 1 to move into the feed. In other words, the first deviation rectifying mechanism 22 can provide power for feeding the pole piece 1.
Illustratively, when it is desired to wind the pole piece 1 and the separator 5, the second driver 226 may advance the pole piece 1 by the first roller 221 to convey the pole piece 1 to the winding needle 3; after the winding needle 3 clamps the pole piece 1, the winding needle 3 starts to drive the pole piece 1 to travel, and the second driver 226 can stop driving the first roller 221.
According to the embodiment of the application, the second driver 226 is arranged, so that manual threading can be reduced, and the automatic winding efficiency of the pole piece 1 is improved.
In some embodiments, the second driver 226 is mounted to the bracket 224.
In some embodiments, the levelness of the first roller 221 is less than or equal to 5 μm to improve the accuracy of the deviation rectification of the pole piece 1.
In some embodiments, the levelness of the second roller 222 is less than or equal to 5 μm to improve the accuracy of the deviation rectification of the pole piece 1.
In some embodiments, the first roller 221 has a levelness of less than or equal to 5 μm and the second roller 222 has a levelness of less than or equal to 5 μm.
In some embodiments, the pole piece feeding device 2 further comprises a measuring mechanism 24, the measuring mechanism 24 being used for measuring the feed length of the pole piece 1.
The measuring mechanism 24 can measure the feeding length of the pole piece 1 in real time so as to switch the start-stop state of the first deviation correcting mechanism 22.
Starting to feed the pole piece 1, when the feeding length measured by the measuring mechanism 24 is smaller than or equal to the preset length L, stopping correcting by the first correcting mechanism 22; when the feeding length measured by the measuring mechanism 24 is greater than the preset length L from the beginning of feeding the pole piece 1, the first deviation rectifying mechanism 22 is started and carries out real-time deviation rectifying on the pole piece 1.
In some embodiments, the measurement mechanism 24 includes an encoder. The encoder can convert the measured feeding length into a signal, so that data transmission can be realized conveniently.
In some embodiments, the measuring mechanism 24 includes a driven roller that may be used to guide the movement of the pole piece 1. The encoder is arranged on the driving roller.
In some embodiments, the driving roller is disposed upstream of the second deviation rectifying mechanism 23.
In some embodiments, the pole piece feeding device 2 further comprises a controller 25, the controller 25 being connected to the measuring mechanism 24 and the first deviation rectifying mechanism 22.
The connection mode of the controller 25 and the measuring mechanism 24 and the connection mode of the controller 25 and the first deviation correcting mechanism 22 are not limited in the embodiment of the present application. The controller 25 may be connected to the measuring mechanism 24 by a cable, or may be connected to the measuring mechanism 24 by a wireless signal, for example. The controller 25 may be connected to the first deviation rectifying mechanism 22 through a cable, or may be connected to the first deviation rectifying mechanism 22 through a wireless signal.
The controller 25 can receive the feeding length signal measured by the measuring mechanism 24 and compare the feeding length of the pole piece 1 with a preset length; when the feeding length is less than or equal to the preset length, the controller 25 controls the first deviation rectifying mechanism 22 so that the first deviation rectifying mechanism 22 is in a stop state; when the feeding length is greater than the preset length, the controller 25 controls the first deviation rectifying mechanism 22, so that the first deviation rectifying mechanism 22 is started and starts to rectify the pole piece 1.
In some embodiments, controller 25 may comprise a PLC controller.
In some embodiments, the controller 25 is connected to an encoder.
In some embodiments, the controller 25 is connected to the first driver 225 and the first sensor 223.
When the charge length is less than or equal to the preset length, the controller 25 does not activate the first driver 225 regardless of the value detected by the first sensor 223.
When the charge length is greater than the preset length, if the value detected by the first sensor 223 is within (D-S) - (d+s), the controller 25 does not activate the first driver 225; if the value detected by the first sensor 223 is outside of (D-S) - (D + S), the controller 25 activates the first driver 225, and the first driver 225 moves the pole piece 1 through the first roller 221 and the second roller 222 to rectify the pole piece 1.
In some embodiments, the second deviation rectifying mechanism 23 further includes a third roller 231, a third driver (not shown), and a second sensor 232, and the pole piece 1 passes through the third roller 231. A second sensor 232 is arranged upstream of the third roller 231 and is used for sensing the position of the pole piece 1 in the axial direction X. The third driver may drive the third roller 231 to move in the axial direction X to rectify the pole piece 1 passing through the third roller 231.
In some embodiments, the controller 25 is connected to the third driver and the second sensor 232.
The embodiment of the application also provides winding equipment, which comprises the pole piece feeding device 2 and the winding needle 3 provided by any one of the embodiments, and is used for winding the pole piece 1 conveyed by the pole piece feeding device 2.
The first deviation rectifying mechanism 22 may be located between the winding needle 3 and the second deviation rectifying mechanism 23.
In some embodiments, the winding apparatus further includes a separator feeding device 4, the separator feeding device 4 being configured to supply the separator 5 to the winding needle 3, and the winding needle 3 winds the pole piece 1 and the separator 5 to prepare the electrode assembly.
In some embodiments, the winding needle 3 includes two half shafts 31 disposed opposite to each other, and the two half shafts 31 may clamp the insulation film 5 to drive the insulation film 5 to move and wind the insulation film 5.
In some embodiments, the winding apparatus includes two pole piece feeders 2 and two separator feeders 4, the two pole piece feeders 2 being for conveying the positive pole piece and the negative pole piece, respectively, and the two separator feeders 4 being for conveying the two separator films 5. The two separator films 5 separate the positive electrode sheet and the negative electrode sheet during winding.
In some embodiments, the minimum distance between the first deviation rectifying mechanism 22 and the winding needle 3 is less than a preset length.
When the winding needle 3 starts to wind the pole piece 1, the pole piece 1 can be flattened under the driving of the winding needle 3, so that the phenomenon of edge collapse is reduced. According to the embodiment of the application, the first deviation rectifying mechanism 22 can be started after the pole piece 1 enters the winding needle 3, so that the error correcting action of the first deviation rectifying mechanism 22 is reduced.
In some embodiments, the winding apparatus further comprises a cutter 6, the cutter 6 being located between the winding needle 3 and the first deviation rectifying mechanism 22.
After the electrode assembly is wound and formed, the cutting blade 6 may cut off the electrode sheet 1.
When the cutter 6 cuts off the pole piece 1, the pole piece feeding device 2 stops conveying the pole piece 1. The cutting position of the pole piece 1 is the feeding free end of the pole piece 1 in the next feeding period. The feeding free end is in a suspended state, so that the tension of the head area of the pole piece 1, which is close to the feeding free end, is small, and the edge of the head area can possibly collapse. By controlling the starting time of the first deviation rectifying mechanism 22, the embodiment of the application can reduce the error rectifying action of the first deviation rectifying mechanism 22 caused by the collapse of the head area.
In some embodiments, the first deviation rectifying mechanism 22 is located above the winding needle 3. The second driver 226 can drive the first roller 221 to move the pole piece 1 downward and into between the two winding half shafts 31, facilitating the two winding half shafts 31 to grip the pole piece 1.
Fig. 4 is a schematic block diagram of a pole piece deviation rectifying method provided in some embodiments of the present application.
Referring to fig. 1 to fig. 4, an embodiment of the present application provides a pole piece deviation rectifying method, which includes:
s100, starting feeding of the pole piece 1 passing through the first deviation correcting mechanism 22;
s200, starting from the feeding of the pole piece 1, stopping correcting by the first correcting mechanism 22 before the feeding length of the pole piece 1 reaches a preset length;
s300, after the feeding length of the pole piece 1 reaches the preset length, the first deviation rectifying mechanism 22 rectifies the pole piece 1.
In the embodiment of the application, the head region with smaller tension of the pole piece 1 can pass through the first deviation rectifying mechanism 22, and the first deviation rectifying mechanism 22 does not rectify the pole piece 1 in a section of length of the pole piece 1 starting to feed, so that error deviation rectifying actions of the first deviation rectifying mechanism 22 due to edge collapse of the head region are reduced. When the feeding length of the pole piece 1 exceeds the preset length, the head area of the pole piece 1 is basically wound to the target position, the pole piece 1 is small in collapse degree under the action of tension, the first deviation correcting mechanism 22 can be normally started, the pole piece 1 is corrected in real time, the winding alignment degree of the pole piece 1 is improved, the risk of wrinkling of the pole piece 1 is reduced, and the reliability of a battery monomer is improved.
In some embodiments, the preset length L is 20mm-500mm. Alternatively, the preset length L is 20mm, 50mm, 80mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm or 500mm.
If the preset length L is too small, the first deviation rectifying mechanism 22 may still perform a deviation rectifying action due to the collapse of the head region; if the preset length L is too large, the pole piece 1 may deviate greatly due to the tape running of a large length, so that the pole piece 1 is at risk of wrinkling.
The preset length L is limited to 20-500 mm, so that error correction actions of the first correction mechanism 22 are reduced, deviation of the pole piece 1 is reduced, and wrinkling risk of the pole piece 1 is reduced.
In some embodiments, the preset length L is 50mm-150mm. Limiting the preset length L to 50-150 mm can further reduce error correction actions of the first correction mechanism 22, reduce offset of the pole piece 1 and reduce wrinkling risk of the pole piece 1.
In some embodiments, the pole piece deviation rectifying method further comprises:
s400, setting a preset length;
s500, starting from feeding of the pole piece 1, calculating the feeding length of the pole piece 1;
s600, comparing the feeding length of the pole piece 1 with a preset length.
The execution sequence of S400 and S100 is not sequential. Optionally, step S400 is performed first, and then step S100 is performed.
Illustratively, after step S100, steps S500 and S600 may be performed continuously.
The start and stop of the first deviation rectifying mechanism 22 are switched by comparing the feeding length with the preset length, so that the error deviation rectifying action of the first deviation rectifying mechanism 22 is reduced.
In some embodiments, step S100 includes: the pole piece 1 sequentially passing through the second deviation correcting mechanism 23 and the first deviation correcting mechanism 22 starts feeding. The pole piece deviation rectifying method further comprises the following step S700: the second deviation rectifying mechanism 23 rectifies the pole piece 1 after the pole piece 1 starts feeding.
The second deviation rectifying mechanism 23 is far away from the head area of the pole piece 1, the collapse degree of the pole piece 1 at the second deviation rectifying mechanism 23 is small, and the second deviation rectifying mechanism 23 can rectify the pole piece 1 from the beginning of feeding the pole piece 1, so that the winding alignment degree of the pole piece 1 is improved. The first deviation rectifying mechanism 22 and the second deviation rectifying mechanism 23 rectify the deviation at a plurality of positions of the pole piece 1 so as to reduce the deviation of the pole piece 1 in the process of feeding the material, improve the reliability of the battery cell and prolong the service life of the battery cell.
The components involved in the pole piece deviation correcting method in the embodiment of the application can refer to the pole piece feeding device provided in any of the previous embodiments.
Referring to fig. 1 to 3, an embodiment of the present application provides a pole piece feeding device 2, which includes an unreeling mechanism 21, a first deviation rectifying mechanism 22, a second deviation rectifying mechanism 23, and a measuring mechanism 24. The unreeling mechanism 21 is used for setting the pole piece 1.
The second deviation rectifying mechanism 23 is arranged between the first deviation rectifying mechanism 22 and the unreeling mechanism 21, and the measuring mechanism 24 is arranged between the second deviation rectifying mechanism 23 and the unreeling mechanism 21. The measuring mechanism 24 is used for measuring the feeding length of the pole piece 1.
The first deviation correcting mechanism 22 includes a first roller 221, a second roller 222, and a first sensor 223. The first roller 221 and the second roller 222 are disposed opposite to each other, and the pole piece 1 is configured to pass between the first roller 221 and the second roller 222. The first roller 221 and the second roller 222 are used for clamping the pole piece 1 and driving the pole piece 1 to move in the axial direction X of the first roller 221. A first sensor 223 is provided upstream of the first roller 221 and is used to sense the position of the pole piece 1 in the axial direction X.
The first deviation rectifying mechanism 22 is configured to: starting to feed the pole piece 1, stopping correcting the deviation by the first deviation correcting mechanism 22 before the feeding length of the pole piece 1 reaches the preset length; after the feeding length of the pole piece 1 reaches the preset length, the first roller 221 and the second roller 222 drive the pole piece 1 to move according to the information detected by the first sensor 223 so as to rectify the pole piece 1.
The second deviation rectifying mechanism 23 is arranged between the first deviation rectifying mechanism 22 and the unreeling mechanism 21, and the second deviation rectifying mechanism 23 is configured to rectify the pole piece 1 after the pole piece 1 starts feeding.
While the present application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, the technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (18)

1. A pole piece feeding device, characterized by comprising:
the unreeling mechanism is used for setting the pole piece; and
a first deviation rectifying mechanism configured to: starting to feed the pole piece, and stopping correcting the deviation by the first deviation correcting mechanism before the feeding length of the pole piece reaches a preset length; and after the feeding length of the pole piece reaches the preset length, correcting the pole piece by the first correcting mechanism.
2. The pole piece feeding device of claim 1, wherein the first deviation rectifying mechanism comprises a first roller and a second roller disposed opposite each other, the pole piece configured to pass between the first roller and the second roller;
the first roller and the second roller are used for clamping the pole piece and driving the pole piece to move in the axial direction of the first roller.
3. The pole piece feeding device of claim 2, wherein the first deviation rectifying mechanism further comprises a first sensor disposed upstream of the first roller and configured to sense a position of the pole piece in the axial direction.
4. The pole piece feeding device of claim 2, wherein the first deviation rectifying mechanism further comprises:
a bracket to which the first roller and the second roller are rotatably connected; and
and the first driver is used for driving the bracket to move along the axial direction.
5. The pole piece feeding device of claim 2, wherein the first deviation rectifying mechanism further comprises a second driver for driving the first roller to rotate.
6. The pole piece feeding device of claim 2, wherein the levelness of the first roller is less than or equal to 5 μιη; and/or
The levelness of the second roller is less than or equal to 5 μm.
7. The pole piece feeding device of claim 1, further comprising a measuring mechanism for measuring a feed length of the pole piece.
8. The pole piece feeding device of claim 7, wherein the measuring mechanism comprises an encoder.
9. The pole piece feeding device of claim 7 or 8, further comprising a controller connected to the measuring mechanism and the first deviation rectifying mechanism.
10. The pole piece feeding device of claim 1, further comprising a second deviation rectifying mechanism disposed between the first deviation rectifying mechanism and the unreeling mechanism, the second deviation rectifying mechanism configured to rectify the pole piece after the beginning of the feeding of the pole piece.
11. A winding apparatus, characterized by comprising:
the pole piece feeding device according to any one of claims 1-10; and
and the winding needle is used for winding the pole piece conveyed by the pole piece feeding device.
12. The winding apparatus of claim 11, wherein a minimum distance between the first deviation rectifying mechanism and the winding needle is less than the preset length.
13. The winding device according to claim 11 or 12, further comprising a cutter located between the winding needle and the first deviation rectifying mechanism.
14. The pole piece deviation rectifying method is characterized by comprising the following steps of:
starting feeding of the pole piece passing through the first deviation correcting mechanism;
starting to feed the pole piece, and stopping correcting the deviation by the first deviation correcting mechanism before the feeding length of the pole piece reaches a preset length;
and after the feeding length of the pole piece reaches the preset length, correcting the pole piece by the first correcting mechanism.
15. The pole piece deviation rectifying method according to claim 14, wherein the preset length is 20mm-500mm.
16. The pole piece deviation rectifying method according to claim 15, wherein the preset length is 50mm-150mm.
17. The pole piece deviation rectifying method according to any one of claims 14 to 16, further comprising:
setting the preset length;
calculating the feeding length of the pole piece from the beginning of feeding the pole piece;
and comparing the feeding length of the pole piece with the preset length.
18. The method for rectifying deviation of pole piece according to claim 14, characterized in that,
the step of starting feeding of the pole piece passing through the first deviation correcting mechanism comprises the following steps: the pole pieces sequentially passing through the second deviation correcting mechanism and the first deviation correcting mechanism start feeding;
the pole piece deviation rectifying method further comprises the following steps: and the second deviation rectifying mechanism rectifies the pole piece after the pole piece starts feeding.
CN202310280573.3A 2023-03-22 2023-03-22 Pole piece feeding device, winding equipment and pole piece deviation correcting method Active CN116081370B (en)

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