WO2020088220A1 - 传送辊、卷绕机以及电芯极片传送方法 - Google Patents

传送辊、卷绕机以及电芯极片传送方法 Download PDF

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Publication number
WO2020088220A1
WO2020088220A1 PCT/CN2019/110769 CN2019110769W WO2020088220A1 WO 2020088220 A1 WO2020088220 A1 WO 2020088220A1 CN 2019110769 W CN2019110769 W CN 2019110769W WO 2020088220 A1 WO2020088220 A1 WO 2020088220A1
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WO
WIPO (PCT)
Prior art keywords
conveying roller
pole piece
end surface
shaft section
mandrel
Prior art date
Application number
PCT/CN2019/110769
Other languages
English (en)
French (fr)
Inventor
王艺若
张小畏
常洪文
王晓
王培潮
陈希
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to US16/964,324 priority Critical patent/US11929464B2/en
Priority to EP19858689.3A priority patent/EP3675269A4/en
Publication of WO2020088220A1 publication Critical patent/WO2020088220A1/zh

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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
    • 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
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/26—Registering, tensioning, smoothing or guiding webs longitudinally by transverse stationary or adjustable bars or rollers
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2601/00—Problem to be solved or advantage achieved
    • B65H2601/20—Avoiding or preventing undesirable effects
    • B65H2601/25—Damages to handled material
    • B65H2601/253—Damages to handled material to particular parts of material
    • B65H2601/2531—Edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2601/00—Problem to be solved or advantage achieved
    • B65H2601/50—Diminishing, minimizing or reducing
    • B65H2601/52—Diminishing, minimizing or reducing entities relating to handling machine
    • B65H2601/525—Cost of application or use, e.g. energy, consumable
    • 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

Definitions

  • the present application relates to the technical field of batteries, and in particular to a conveying roller, a winder, and a method for conveying cell pole pieces.
  • the battery cell is formed by winding the electrode pole piece.
  • the cell pole piece includes a main body portion and a tab.
  • the winding efficiency of the winding machine greatly affects the production efficiency of the battery cell. Therefore, in order to improve the production efficiency of the battery cell, the currently commonly used method is to increase the winding speed of the winding machine, but as the winding speed increases, there will be problems such as pole ear discounts and the quality of the battery cell cannot be guaranteed.
  • Embodiments of the present application provide a conveying roller, a winder, and a method for conveying cell pole pieces.
  • the conveying roller can reduce the possibility that the pole ears are turned or bent during the conveying process, and ensure the quality of the finished battery core.
  • an embodiment of the present application provides a conveying roller for conveying a cell pole piece.
  • the cell pole piece includes a main body portion and a tab, the main body portion includes a support area and a transition area, and the tab has a root portion, an intermediate section and The top part, the root part is connected with the transition zone,
  • the conveying roller includes: a central axis, a first end face and a second end face oppositely arranged along the central axis, a transmission part and an avoidance position between the first end face and the second end face, the transmission part It can rotate around the central axis, the support area can be in contact with the transmission part, so that the transmission part can apply transmission friction to the pole piece of the core, and the avoidance position can avoid the transition area and the pole ear.
  • the conveying roller includes a mandrel, the axis of the mandrel coincides with the central axis, the transmission part is a first rotating drum sleeved on the mandrel, and the support area can be connected to the outer peripheral surface of the first rotating drum Fittingly, the two end surfaces oppositely arranged along the central axis on the mandrel form a first end surface and a second end surface, respectively, and the space between the end surface of the first rotating cylinder facing the second end surface and the second end surface forms a evacuation position.
  • the difference between the radius of the first drum and the radius of the mandrel is 0.1 mm to 0.5 mm.
  • the annular edge of the first rotating drum near the second end surface has a rounded transition structure.
  • the conveying roller includes a mandrel and a second rotating cylinder sleeved on the mandrel.
  • Two end surfaces oppositely arranged along the central axis on the mandrel form a first end surface and a second end surface, respectively.
  • the two rotating drums have a first shaft section and a second shaft section, the diameter of the first shaft section is larger than that of the second shaft section, the transmission part is the first shaft section, and the support area can fit the outer peripheral surface of the first shaft section.
  • the space between the outer peripheral surface of the shaft segment and the outer peripheral surface of the second shaft segment forms a evacuation space.
  • the difference between the radius of the first shaft segment and the radius of the second shaft segment is 0.1 mm to 0.5 mm.
  • the distance between the end surface of the first shaft section facing the second end surface and the end surface of the second shaft section facing the second end surface is 5 mm to 30 mm.
  • the annular edge of the first shaft section near the second end surface has a rounded transition structure.
  • the conveying roller further includes a smoothing member, the smoothing member is provided corresponding to the position of the avoidance position, the pole ear can pass between the smoothing member and the avoidance position, and the smoothing member can be opposite to the pole The ear exerts a force toward the central axis to smooth the pole ear.
  • the smoothing member includes a first smoothing plate and a second smoothing plate, and the first smoothing plate and the second smoothing plate are arranged around the central axis.
  • the conveying roller includes a central axis, first and second end surfaces that are oppositely disposed along the central axis, a transmission portion and an evacuation position that are provided between the first and second end surfaces.
  • the transmission part and the avoidance position are arranged along the central axis.
  • the conveying roller of this embodiment does not contact the conveying roller due to the uneven edge between the two pole lugs because the conveying roller has a vacant position during the process of conveying the cell pole pieces.
  • the conveying roller will not apply compressive stress to the convex area of the uneven edge of the main body, so that the tab will not move away from the conveying roller under the compressing action of the conveying roller.
  • the distance so that when the conveying roller drives the core pole piece to rotate at a high speed, the centrifugal force received by the pole lug will not increase, effectively reducing the possibility of the pole lug turning or bending away from the conveying roller under the centrifugal force.
  • the possibility of the isolation membrane being pierced by the turned and bent pole ears is reduced, and the yield rate of the wound core and the safety of subsequent use are improved.
  • a winding machine includes the conveying roller of the above embodiment.
  • a cell pole piece conveying method wherein the cell pole piece is conveyed using a conveying roller as in the above embodiment, and the transmission part applies a transmission friction force to the support area of the cell pole piece to The pole piece of the electric core is driven to move in the driving direction, and the evacuation position of the conveying roller avoids the transition area and the pole ear of the pole piece of the electric core.
  • FIG. 1 is a schematic structural diagram of a cell pole piece according to an embodiment of the present application
  • FIG. 2 is a schematic cross-sectional structure diagram of a cell pole piece of an embodiment of the present application
  • FIG. 3 is a schematic isometric view of the matching state of the conveying roller and the cell pole piece according to an embodiment of the present application
  • FIG. 4 is a partial structural schematic diagram of a matching state of a conveying roller and a cell pole piece according to an embodiment of the present application
  • FIG. 5 is a schematic isometric view of the matching state of the transfer roller and the cell pole piece of another embodiment of the present application.
  • FIG. 6 is a schematic diagram of a partial structure of a matching state of a transfer roller and a cell pole piece of another embodiment of the present application;
  • FIG. 7 is a schematic isometric view of a further embodiment of the application of the conveying roller and battery core pole piece matching state
  • FIG. 8 is a schematic diagram of a transmission mechanism for transmitting a pole piece of a battery according to an embodiment of the present application.
  • Cell pole piece 11, main body part; 11a, support area; 11b, transition area; 12, pole ear; 12a, root; 12b, middle section; 12c, top;
  • Conveying roller 20a, central axis; 21, first end face; 22, second end face; 23, mandrel; 24, first drum; 24a, rounded corner transition structure; 25, avoidance position; 26, second Drum; 26a, first shaft section; 26b, second shaft section; 27, smoothing member; 27a, first smoothing plate; 27b, second smoothing plate;
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a Disconnected, or integrally connected; either directly connected or indirectly connected through an intermediary.
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a Disconnected, or integrally connected; either directly connected or indirectly connected through an intermediary.
  • the cell pole piece 10 of the embodiment of the present application has a predetermined length and width.
  • the cell pole piece 10 includes a main body portion 11 and a tab 12 connected to the main body portion 11.
  • the main body portion 11 and the pole lug 12 of the cell pole piece 10 have a thin sheet structure, and are soft and easily deformed.
  • the main body portion 11 and the tabs 12 are arranged in the width direction X.
  • the number of pole ears 12 is more than two.
  • two or more tabs 12 are provided on the main body 11 at intervals along the longitudinal direction Y of the cell pole piece 10.
  • the main body portion 11 includes a support area 11a and a transition area 11b arranged in the width direction X. The dotted line shown in FIG.
  • the tab 12 includes a root 12a, a middle section 12b, and a top 12c arranged in the width direction X.
  • the root 12a of the pole ear 12 is connected to the transition area 11b.
  • the body portion 11 of this embodiment has an edge between the two tabs 12 (that is, the edge of the transition area 11b).
  • the cell pole piece 10 is formed by cutting out excess material from the entire pole piece blank through a cutting process to form each pole tab 12. After the cutting step, the pole piece 12 and the main body 11 are formed on the pole piece blank. However, each edge of the pole ear 12 itself and the edge of the body portion 11 between the two pole ears 12 may be uneven. As shown in FIG.
  • a conveying roller 20 is needed to transfer the cell pole piece 10 to the winding needle, so that the winding needle can be wound out The battery cell required by the product.
  • the rotation speed of the conveying roller 20 is higher to improve the efficiency of conveying the cell pole piece 10.
  • the pole lug 12 may be turned or bent in a direction away from the conveying roller 20 under the centrifugal force.
  • the conveying roller 20 of this embodiment includes a central axis 20a, a first end surface 21 and a second end surface 22 oppositely disposed along the central axis 20a, and a Transmission part and evacuation position 25.
  • the transmission parts and the evacuation positions 25 are arranged along the central axis 20a, and may also be arranged along the width direction X.
  • the transmission part can rotate around the central axis 20a.
  • the evacuation position 25 of the conveying roller 20 can avoid the transition area 11 b of the cell pole piece 10 and the entire pole ear 12. In this way, in the process of conveying the cell pole piece 10 in the conveying roller 20 of this embodiment, since the conveying roller 20 has the evacuation position 25, the uneven edge of the body portion 11 between the two pole ears 12 will not The roller 20 is in contact.
  • the conveying roller 20 does not apply compressive stress to the convex areas on the uneven edges of the main body portion 11 and the tab 12, so that the tab 12 will not move away from the conveying roller 20 under the squeezing action of the conveying roller 20 ,
  • the moving distance is the same as the protrusion height of the convex area, so that when the conveying roller 20 drives the cell pole piece 10 to rotate at a high speed, the centrifugal force that the pole lug 12 bears will not increase, effectively reducing the role of the pole lug 12 in the centrifugal force
  • the possibility of turning out and bending downward in the direction away from the conveying roller 20 reduces the possibility of the separator in the finished battery core being punctured by the turned and bent tabs 12 and improves the finished finished winding core Rate and safety of subsequent use.
  • the conveying roller 20 of the embodiment of the present application includes a mandrel 23 and a first rotating drum 24 sleeved on the mandrel 23.
  • the axis of the mandrel 23 coincides with the central axis 20a.
  • the mandrel 23 has a first end and a second end opposed in the axial direction.
  • the end surface of the first end portion is the first end surface 21, and the end surface of the second end surface 22 is the second end surface 22.
  • the first drum 24 of this embodiment is a transmission part.
  • the first rotating drum 24 has a straight cylinder structure.
  • the space between the end face of the first rotating drum 24 facing the second end face 22 and the second end face 22 forms a shelter 25.
  • the support area 11 a of the cell pole piece 10 can be attached to the outer peripheral surface of the first drum 24.
  • the width direction X the transition area 11b of the cell pole piece 10 and the entire tab 12 are located outside the first rotating drum 24 and correspond to the evacuation position 25, Thus, the entire transition area 11b and the entire tab 12 do not come into contact with the conveying roller 20.
  • the difference between the radius of the first drum 24 and the radius of the mandrel 23 in this embodiment is 0.1 mm to 0.5 mm, that is, the depth value D of the evacuation position 25 along the radial direction of the first drum 24 is 0.1 mm to 0.5 mm.
  • the annular edge of the first drum 24 near the second end surface 22 of this embodiment has a rounded transition structure 24a.
  • the outer peripheral surface of the first rotating drum 24 and the end surface of the first rotating drum 24 are connected by a rounded transition structure 24a.
  • the material of the first rotating drum 24 in this embodiment may be aluminum alloy, carbon solder, rubber, magnesium aluminum alloy or other materials.
  • the first rotating drum 24 of this embodiment is rotatably connected to the mandrel 23 through bearings.
  • a stop ring and an end cover are provided on a side of the first rotating drum 24 close to the second end surface 22 to fix the first rotating drum 24.
  • the conveying roller 20 is connected and fixed to other mounting platforms through the first end of the mandrel 23.
  • the conveying roller 20 of this embodiment further includes a roller holder (not shown in the figure).
  • the roller bracket is connected to the second end of the mandrel 23 to provide support force to the mandrel 23, so that the conveyor roller 20 has better stability during high-speed rotation, which is beneficial to reduce the vibration of the conveyor roller 20 and lower the core pole piece 10.
  • the possibility of jitter during transmission improves the stability of the cell pole piece 10 during transmission.
  • the structure of the conveying roller 20 has been described. In this embodiment, the differences from the first embodiment are mainly explained, and the same structure will not be repeated in this embodiment.
  • the conveying roller 20 of this embodiment includes a mandrel 23 and a second rotating drum 26 sleeved on the mandrel 23.
  • the mandrel 23 has a first end and a second end opposed in the axial direction.
  • the end surface of the first end portion is the first end surface 21, and the end surface of the second end surface 22 is the second end surface 22.
  • the second rotating drum 26 of this embodiment has a straight cylinder structure as a whole.
  • the second drum 26 has a first shaft section 26a and a second shaft section 26b.
  • the first shaft section 26 a and the second shaft section 26 b are arranged along the axial direction of the second rotating drum 26.
  • the diameter of the first shaft section 26a is larger than that of the second shaft section 26b.
  • the first shaft section 26a of this embodiment is a transmission part.
  • the support area 11a of the cell pole piece 10 can be brought into contact with the outer peripheral surface of the first shaft section 26a.
  • the space between the outer peripheral surface of the first shaft segment 26a and the outer peripheral surface of the second shaft segment 26b forms a evacuation space 25.
  • the transition area 11b of the cell pole piece 10 and the entire pole lug 12 are located outside the first shaft section 26a and correspond to the avoidance position 25, Thus, the entire transition area 11b and the entire tab 12 do not come into contact with the conveying roller 20.
  • the difference between the radius of the first shaft section 26a and the radius of the second shaft section 26b ranges from 0.1 mm to 0.5 mm, that is, the depth value W of the evacuation position 25 along the radial direction of the second rotating cylinder 26 is 0.1 mm To 0.5mm.
  • the part of the cell pole piece 10 corresponding to the evacuation position 25 is a floating part.
  • the suspended portion When the suspended portion is at a certain position, the suspended portion will sag toward the second shaft section 26b under its own gravity, and the second shaft section 26b can support the suspended portion where the sag occurs, to avoid excessive hanging of the suspended portion And the folds deformed.
  • the distance L between the end face of the first shaft section 26a facing the second end face 22 and the end face of the second shaft section 26b facing the second end face 22 is 5 mm to 30 mm.
  • the first shaft section 26a overlaps with the transition area 11b of the main body portion 11 and cannot effectively avoid the transition area 11b of the main body portion 11.
  • the portion of the cell pole piece 10 located outside the first shaft section 26a is a floating portion.
  • the suspended portion also applies a pulling force to the portion where the cell pole piece 10 contacts the first shaft section 26a, which causes the portion where the cell pole piece 10 contacts the first shaft section 26a to move away from the first shaft section 26a
  • the detachment causes the conveying roller 20 to fail to convey the cell pole piece 10 normally or causes the cell pole piece 10 to be wound around the conveying roller 20 and torn or torn by the conveying roller 20.
  • the annular edge of the first shaft section 26a of the present embodiment near the second end surface 22 has a rounded transition structure 24a.
  • the outer peripheral surface of the first shaft section 26a and the end surface of the first shaft section 26a are connected by a rounded transition structure 24a.
  • the material of the second rotating drum 26 in this embodiment may be aluminum alloy, carbon brazing, rubber or magnesium aluminum alloy.
  • the second rotating drum 26 of this embodiment is rotatably connected to the mandrel 23 through a bearing.
  • a stop ring and an end cover are provided to fix the second rotating cylinder 26.
  • the conveying roller 20 is connected and fixed to other mounting platforms through the first end of the mandrel 23.
  • the conveying roller 20 of this embodiment further includes a roller holder (not shown in the figure).
  • the roller bracket is connected to the second end of the mandrel 23 to provide additional support force to the mandrel 23, so that the conveyor roller 20 has better stability during high-speed rotation, which is beneficial to reduce the vibration of the conveyor roller 20 and reduce the core pole piece 10
  • the possibility of jitter in the transmission process improves the stability of the cell pole piece 10 transmission process.
  • the conveying roller 20 of this embodiment further includes a smoothing member 27.
  • the smoothing member 27 is provided corresponding to the position of the avoidance position 25, the tab 12 of the cell pole piece 10 can pass between the smoothing member 27 and the avoidance position 25, and the smoothing section 27 can apply the pole 12 toward the center
  • the force of the axis 20a smoothes the pole ear 12. Since the conveying roller 20 has the evacuation position 25, and the position of the smoothing member 27 is provided corresponding to the evasion position 25, a sufficiently large gap can be reserved between the smoothing member 27 and the conveyance shaft.
  • the transition region 11b and the tabs 12 of the cell pole piece 10 can easily pass through the gap, and the collision with the conveying roller 20 and / or the smoothing member 27 is less likely to be scratched, so that it can be very large
  • the degree of difficulty in wearing the cell pole piece 10 is reduced to a certain extent, and the structural integrity of the cell pole piece 10 is ensured during the stringing process to prevent the tabs 12 from being scratched or broken, which effectively improves the banding efficiency and reduces the production cost.
  • the smoothing member 27 of this embodiment can apply resistance to the tabs 12 to ensure that the pole pieces 10 are transferred during the process.
  • the small amount of deformation of the ears 12 prevents the pole ears 12 from undergoing large valgus or bending, and reduces the possibility of the pole ears 12 puncturing the isolation membrane after the cell pole pieces 10 are wound to form the cell.
  • the smoothing member 27 of this embodiment includes a first smoothing plate 27a and a second smoothing plate 27b.
  • the first touch plate 27a and the second touch plate 27b are arranged around the central axis 20a.
  • the first touch plate 27a and the second touch plate 27b are connected to each other, so that after the pole ear 12 passes through the first touch plate 27a, it can continue to be restricted and restricted by the second touch plate 27b.
  • the first smoothing plate 27a and the second smoothing plate 27b are connected to the rotating shaft, and the axis of the rotating shaft coincides with the axis of the conveying roller 20.
  • the cell pole piece 10 has a roll-in segment on the roll-in side and a roll-out segment on the roll-out side.
  • Both the first flattening plate 27a and the second flattening plate 27b can be rotated arbitrarily around the rotation axis, so that the first flattening plate 27a and the second flattening plate can be flexibly adjusted according to the different angles between the in-roller segment and the out-roller segment of the cell pole piece 10
  • the position of the caressing plate 27b so as to ensure that the pole ear 12 and the first caressing plate 27a and the second caressing plate 27b are kept in contact and the contact strength between the two is kept balanced.
  • the smoothing member 27 of this embodiment may be directly connected and fixed to the second end of the mandrel 23.
  • the smoothing member 27 of this embodiment may also be separately provided on other installation platforms.
  • the conveying roller 20 of this embodiment includes a central axis 20a, first and second end surfaces 21 and 22 opposite to each other along the central axis 20a, a transmission portion and an evacuation position 25 provided between the first and second end surfaces 21 and 22.
  • the transmission part and the shelter 25 are arranged along the central axis 20a.
  • the transmission part can rotate around the central axis 20a.
  • the evacuation position 25 of the conveying roller 20 can avoid the transition area 11 b of the cell pole piece 10 and the entire pole ear 12. In this way, in the process of conveying the cell pole piece 10 in the conveying roller 20 of this embodiment, since the conveying roller 20 has the evacuation position 25, the uneven edge of the body portion 11 between the two pole ears 12 will not The roller 20 is in contact.
  • the conveying roller 20 does not apply compressive stress to the convex area of the uneven edge of the main body portion 11, so that the tab 12 does not move away from the conveying roller 20 in the direction away from the convex area under the compressive action of the conveying roller 20
  • the protrusions have the same distance, so that when the conveying roller 20 drives the cell pole piece 10 to rotate at a high speed, the centrifugal force received by the pole ear 12 will not increase, effectively reducing the distance of the pole ear 12 away from the conveying roller 20 under the centrifugal force
  • the possibility of valgus and bend in the direction reduces the possibility of the isolation membrane being punctured by the trunnion 12 of the valgus and bend, and improves the yield of the wound core and the safety of subsequent use.
  • a plurality of conveying rollers 20 of this embodiment can constitute a conveying mechanism to change the conveying direction and tension of the conveying process of the cell pole pieces 10 through the plurality of conveying rollers 20.
  • the embodiment of the present application also proposes a winding machine.
  • the winder includes the conveying roller 20 of the above embodiment.
  • the winding machine of this embodiment can effectively reduce the possibility of the tabs 12 buckling or bending during the conveying process under the action of the conveying roller 20, thereby reducing the possibility of the tabs 12 puncturing the isolation film in the finished cell To improve the yield of finished batteries.
  • the embodiment of the present application also proposes a method for transferring the cell pole piece, in which the cell pole piece 10 is transferred using the transfer roller 20 as in the above embodiment.
  • the transmission part applies transmission friction to the support area 11a of the cell pole piece 10 to drive the cell pole piece 10 to move in the transmission direction, and the evacuation position 25 of the conveying roller 20 avoids the transition area 11b and the pole lug 12 of the cell pole piece 10 .
  • This method conveys the cell pole piece 10 through the conveying roller 20 of the above embodiment, which can effectively reduce the possibility of the tabs 12 buckling or bending during the conveying process, thereby reducing the puncture of the separator 12 in the finished cell. The possibility of improving the yield of finished batteries.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Rollers For Roller Conveyors For Transfer (AREA)
  • Secondary Cells (AREA)

Abstract

一种传送辊（20）、卷绕机以及电芯极片（10）传送方法。传送辊（20）用于传送电芯极片（10），电芯极片（10）包括主体部（11）以及极耳（12），主体部（11）包括支承区（11a）和过渡区（11b），极耳（12）具有根部（12a）、中间段（12b）和顶部（12c），根部（12a）与过渡区（11b）相连接，传送辊（20）包括：中心轴线（20a）、沿中心轴线（20a）相对设置的第一端面（21）和第二端面（22）、设置于第一端面（21）和第二端面（22）之间的传动部和避空位（25），传动部能够围绕中心轴线（20a）自转，支承区（11a）能够与传动部接触，以使传动部对电芯极片（10）施加传动摩擦力，避空位（25）能够避让过渡区（11b）以及极耳（12）。传送辊（20）能够降低传送过程中极耳（12）发生外翻或弯折的可能性，保证电芯成品的品质。

Description

传送辊、卷绕机以及电芯极片传送方法
相关申请的交叉引用
本申请要求享有于2018年10月31日提交的名称为“传送辊以及卷绕机”的中国专利申请201811290089.4的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请涉及电池技术领域，特别是涉及一种传送辊、卷绕机以及电芯极片传送方法。
背景技术
随着锂电行业的飞速发展，对电芯的生产效率要求越来越高。电芯通过电芯极片卷绕形成。电芯极片包括主体部和极耳。作为电芯的一个关键工序-卷绕工序，卷绕机的卷绕效率极大的影响着电芯的生产效率。因此，为了提高电芯的生产效率，现通常采用的方式为提高卷绕机的卷绕速度，但随着卷绕速度的提高，会出现极耳打折等问题，无法保证电芯品质。
发明内容
本申请实施例提供一种传送辊、卷绕机以及电芯极片传送方法。传送辊能够降低传送过程中极耳发生外翻或弯折的可能性，保证电芯成品的品质。
一方面，本申请实施例提出了一种传送辊，用于传送电芯极片，电芯极片包括主体部以及极耳，主体部包括支承区和过渡区，极耳具有根部、中间段和顶部，根部与过渡区相连接，传送辊包括：中心轴线、沿中心轴线相对设置的第一端面和第二端面、设置于第一端面和第二端面之间的传动部和避空位，传动部能够围绕中心轴线自转，支承区能够与传动部接 触，以使传动部对电芯极片施加传动摩擦力，避空位能够避让过渡区以及极耳。
根据本申请实施例的一个方面，传送辊包括芯轴，芯轴的轴线与中心轴线重合，传动部为套设于芯轴上的第一转筒，支承区能够与第一转筒的外周表面贴合，芯轴上沿中心轴线相对设置的两个端面分别形成第一端面和第二端面，第一转筒朝向第二端面的端面与第二端面之间的空间形成避空位。
根据本申请实施例的一个方面，第一转筒的半径与芯轴的半径差值范围为0.1mm至0.5mm。
根据本申请实施例的一个方面，第一转筒靠近第二端面的环形边缘具有圆角过渡结构。
根据本申请实施例的一个方面，传送辊包括芯轴以及套设于芯轴上的第二转筒，芯轴上沿中心轴线相对设置的两个端面分别形成第一端面和第二端面，第二转筒具有第一轴段和第二轴段，第一轴段的直径大于第二轴段，传动部为第一轴段，支承区能够与第一轴段的外周表面贴合，第一轴段的外周表面与第二轴段的外周表面之间的空间形成避空位。
根据本申请实施例的一个方面，第一轴段的半径与第二轴段的半径差值范围为0.1mm至0.5mm。
根据本申请实施例的一个方面，第一轴段朝向第二端面的端面与第二轴段朝向第二端面的端面之间的距离为5mm至30mm。
根据本申请实施例的一个方面，第一轴段靠近第二端面的环形边缘具有圆角过渡结构。
根据本申请实施例的一个方面，传送辊还包括抚平部件，抚平部件与避空位位置相对应地设置，极耳能够从抚平部件和避空位之间穿过，抚平部件能够对极耳施加朝向中心轴线的作用力，以抚平极耳。
根据本申请实施例的一个方面，抚平部件包括第一抚平板和第二抚平板，第一抚平板和第二抚平板围绕中心轴线排布设置。
根据本实施例的传送辊包括中心轴线、沿中心轴线相对设置的第一端面和第二端面、设置于第一端面和第二端面之间的传动部和避空位。传动 部和避空位沿中心轴线排布。在传送辊传送电芯极片时，电芯极片的支承区能够与传动部接触，以使传动部对电芯极片施加传动摩擦力，从而电芯极片在传动部的带动下移动。同时，传送辊的避空位能够避让电芯极片的过渡区以及整个极耳。这样，本实施例的传送辊在传送电芯极片的过程中，由于传送辊具有避空位，因此主体部位于两个极耳之间的凹凸不平的边缘不会与传送辊接触。传送辊不会对主体部凹凸不平的边缘中的凸起区域施加挤压应力，从而极耳不会在传送辊挤压作用下向远离传送辊的方向移动与凸起区域的凸出高度相同的距离，进而使得当传送辊带动电芯极片高速转动时，极耳所承受的离心力不会增大，有效降低极耳在离心力作用下朝远离传送辊的方向外翻、折弯的可能性，降低隔离膜被外翻、折弯的极耳刺破的可能性，提高卷绕形成的电芯的成品率和后续使用的安全性。
另一个方面，根据本申请实施例提供一种卷绕机，包括上述实施例的传送辊。
再一个方面，根据本申请实施例提供一种电芯极片传送方法，其中，采用如上述实施例的传送辊传送电芯极片，传动部对电芯极片的支承区施加传动摩擦力以带动电芯极片沿传动方向移动，且传送辊的避空位避让电芯极片的过渡区和极耳。
附图说明
下面将通过参考附图来描述本申请示例性实施例的特征、优点和技术效果。
图1是本申请实施例的电芯极片结构示意图；
图2是本申请实施例的电芯极片的剖视结构示意图；
图3是本申请一实施例的传送辊和电芯极片配合状态的轴测示意图；
图4是本申请一实施例的传送辊和电芯极片配合状态的局部结构示意图；
图5是本申请另一实施例的传送辊和电芯极片配合状态的轴测示意图；
图6是本申请另一实施例的传送辊和电芯极片配合状态的局部结构示 意图；
图7是本申请又一实施例的传送辊和电芯极片配合状态的轴测示意图；
图8是本申请一实施例的传送机构传送电芯极片示意图。
在附图中，附图并未按照实际的比例绘制。
标记说明：
10、电芯极片；11、主体部；11a、支承区；11b、过渡区；12、极耳；12a、根部；12b、中间段；12c、顶部；
20、传送辊；20a、中心轴线；21、第一端面；22、第二端面；23、芯轴；24、第一转筒；24a、圆角过渡结构；25、避空位；26、第二转筒；26a、第一轴段；26b、第二轴段；27、抚平部件；27a、第一抚平板；27b、第二抚平板；
X、宽度方向；Y、长度方向。
具体实施方式
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即本申请不限于所描述的实施例。
在本申请的描述中，需要说明的是，除非另有说明，“多个”的含义是两个或两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位置关系仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”等仅用于描述目的，而不能理解为指示或暗示相对重要性。
在本申请的描述中，还需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本申请中的具体含义。
为了更好地理解本申请，下面结合图1至图8根据本申请实施例的传送辊20进行详细描述。
参见图1、图2所示，本申请实施例的电芯极片10具有预定的长度和宽度。电芯极片10包括主体部11和与主体部11相连接的极耳12。电芯极片10的主体部11和极耳12均为薄片结构，柔软易变形。主体部11和极耳12沿宽度方向X排布。极耳12的数量为两个以上。本实施例中，两个以上的极耳12沿电芯极片10的长度方向Y间隔设置于主体部11。主体部11包括沿宽度方向X排布的支承区11a和过渡区11b。图1中所示出的用于表示支承区11a和过渡区11b边界的虚线并不代表实体结构。极耳12包括沿宽度方向X排布的根部12a、中间段12b以及顶部12c。极耳12的根部12a与过渡区11b相连接。本实施例的主体部11具有位于两个极耳12之间的边缘(也即过渡区11b的边缘)。电芯极片10是由整张极片坯料通过裁切工序裁切掉多余的材料而形成各个极耳12。在经过裁切工序后，极片坯料上形成极耳12以及主体部11。然而，极耳12自身的各个边缘以及主体部11位于两个极耳12之间的边缘会出现凹凸不平的情况。参见图3所示，本实施例的电芯极片10在卷绕形成电芯的过程中，需要使用传送辊20将电芯极片10传送至卷针处，以使卷针卷绕出满足产品要求的电芯。传送辊20的转速较高，以提高传送电芯极片10的效率。电芯极片10经过传送辊20时，极耳12会在离心力的作用下会具有朝远离传送辊20方向外翻或弯折的可能性。
继续参见图4所示，本实施例的传送辊20包括中心轴线20a、沿中心轴线20a相对设置的第一端面21和第二端面22、设置于第一端面21和第二端面22之间的传动部和避空位25。传动部和避空位25沿中心轴线20a排布，也可以指沿宽度方向X排布。传动部能够围绕中心轴线20a自转。在传送辊20传送电芯极片10时，电芯极片10的支承区11a能够与传动部接触，以使传动部对电芯极片10施加传动摩擦力，从而电芯极片10在传动部的带动下移动。同时，传送辊20的避空位25能够避让电芯极片10的过渡区11b以及整个极耳12。这样，本实施例的传送辊20在传送电芯 极片10的过程中，由于传送辊20具有避空位25，因此主体部11位于两个极耳12之间的凹凸不平的边缘不会与传送辊20接触。传送辊20不会对主体部11和极耳12上凹凸不平的边缘中的凸起区域施加挤压应力，从而极耳12不会在传送辊20挤压作用下向远离传送辊20的方向移动，移动的距离与凸起区域的凸出高度相同，进而使得当传送辊20带动电芯极片10高速转动时，极耳12所承受的离心力不会增大，有效降低极耳12在离心力作用下朝远离传送辊20的方向外翻、折弯的可能性，降低电芯成品中的隔离膜被外翻、折弯的极耳12刺破的可能性，提高卷绕形成的电芯的成品率和后续使用的安全性。
以下通过具体实施例来对传送辊20的技术方案进行进一步描述，但以下实施例并不限定本实用新型权利要求的保护范围。
第一实施例：
参见图3和图4所示，本申请实施例的传送辊20包括芯轴23以及套设于芯轴23上的第一转筒24。芯轴23的轴线与中心轴线20a重合。芯轴23具有沿轴向相对的第一端部和第二端部。第一端部的端面为第一端面21，而第二端面22的端面为第二端面22。本实施例的第一转筒24为传动部。第一转筒24为直筒结构。第一转筒24朝向第二端面22的端面与第二端面22之间的空间形成避空位25。在传送辊20传送电芯极片10时，电芯极片10的支承区11a能够与第一转筒24的外周表面贴合。在第一转筒24的轴向方向(也可以指宽度方向X)上，电芯极片10的过渡区11b以及整个极耳12位于第一转筒24的外侧并且与避空位25相对应，从而整个过渡区11b以及整个极耳12不会与传送辊20相接触。
本实施例的第一转筒24的半径与芯轴23的半径差值范围为0.1mm至0.5mm，也即避空位25沿第一转筒24的径向的深度值D为0.1mm至0.5mm。在极片坯料经过裁切工序形成电芯极片10后，主体部11的边缘和极耳12的边缘形成的凸起高度存在差异。传送辊20所包括的避空位25能够适应不同高度凸起的情况，从而能够很好地避让电芯极片10的边缘凸起区域，提升避空位25的适应能力。
本实施例的第一转筒24靠近第二端面22的环形边缘具有圆角过渡结 构24a。第一转筒24的外周表面和第一转筒24的端面通过圆角过渡结构24a相连接。第一转筒24的圆角过渡结构24a与电芯极片10的主体部11之间保持有微小的间隙，从而第一转筒24在高速转动时，第一转筒24的环形边缘不会对电芯极片10的主体部11施加应力。这样，主体部11与环形边缘相对应的位置不会出现应力集中的情况，有效降低主体部11被环形边缘割伤或刺破的可能性，有利于提高电芯极片10的结构完整性和传送过程安全性。
本实施例的第一转筒24的材质可以为铝合金、碳钎维、橡胶或镁铝合金等材料。本实施例的第一转筒24通过轴承与芯轴23转动连接。在第一转筒24靠近第二端面22的一侧设置挡圈以及端盖，以固定第一转筒24。传送辊20通过芯轴23的第一端部连接固定于其他安装平台上。本实施例的传送辊20还包括辊支架(图中未示出)。辊支架与芯轴23的第二端部相连接，用于对芯轴23提供支撑力，使得传送辊20高速转动时稳定性更好，有利于降低传送辊20振动，降低电芯极片10传送过程中出现抖动的可能性，提升电芯极片10传送过程的平稳性。
第二实施例：
在第一实施例中，对传送辊20的结构进行了说明。在本实施例中，主要说明与第一实施例的不同之处，相同的结构在本实施例中不再重复说明。
参见图5和图6所示，本实施例的传送辊20包括芯轴23以及套设于芯轴23上的第二转筒26。芯轴23具有沿轴向相对的第一端部和第二端部。第一端部的端面为第一端面21，而第二端面22的端面为第二端面22。本实施例的第二转筒26整体为直筒结构。第二转筒26具有第一轴段26a和第二轴段26b。第一轴段26a和第二轴段26b沿第二转筒26的轴向排布设置。第一轴段26a的直径大于第二轴段26b。本实施例的第一轴段26a为传动部。在传送辊20传送电芯极片10时，电芯极片10的支承区11a能够与第一轴段26a的外周表面贴合。第一轴段26a的外周表面与第二轴段26b的外周表面之间的空间形成避空位25。在第二转筒26的轴向 方向(也可以指宽度方向X)上，电芯极片10的过渡区11b以及整个极耳12位于第一轴段26a的外侧并且与避空位25相对应，从而整个过渡区11b以及整个极耳12不会与传送辊20相接触。
本实施例的第一轴段26a的半径与第二轴段26b的半径差值范围为0.1mm至0.5mm，也即避空位25沿第二转筒26的径向的深度值W为0.1mm至0.5mm。在极片坯料经过裁切工序形成电芯极片10后，主体部11的边缘和极耳12的边缘形成的凸起高度存在差异。本实施例的避空位25能够适应不同高度凸起的情况，从而很好地避让电芯极片10的边缘凸起区域，提升避空位25的适应能力。另外，电芯极片10与避空位25相对应的部分为悬空部分。当该悬空部分处于某一位置时，悬空部分会在自身重力作用会下朝第二轴段26b下垂，而第二轴段26b能够对发生下垂的悬空部分起到支撑作用，避免悬空部分过度下垂而出现褶皱变形的情况。
本实施例的第一轴段26a上朝向第二端面22的端面与第二轴段26b上朝向第二端面22的端面之间的距离L为5mm至30mm。该距离小于5mm时，第一轴段26a会与主体部11的过渡区11b重叠，无法有效避让主体部11的过渡区11b。电芯极片10位于第一轴段26a外侧的部分(也即不与第一轴段26a的外周表面接触的部分)为悬空部分。该距离大于30mm时，电芯极片10位于第一轴段26a外侧的悬空部分过多，从而使得该悬空部分会在重力作用会下整体发生下垂，导致该悬空部分出现褶皱情况，同时下垂的悬空部分也会对电芯极片10与第一轴段26a相接触的部分施加牵拉力，从而会导致电芯极片10与第一轴段26a相接触的部分从第一轴段26a上脱离，进而导致传送辊20无法正常传送电芯极片10或者导致电芯极片10缠绕于传送辊20而被传送辊20撕裂或撕断。
本实施例的第一轴段26a靠近第二端面22的环形边缘具有圆角过渡结构24a。第一轴段26a的外周表面和第一轴段26a的端面通过圆角过渡结构24a相连接。第一轴段26a的圆角过渡结构24a与电芯极片10的主体部11之间保持有微小的间隙，第从而二转筒在高速转动时，第一轴段26a的环形边缘不会对电芯极片10的主体部11施加应力。这样，主体部11与环形边缘相对应的位置不会出现应力集中的情况，有效降低主体部 11被环形边缘割伤或刺破的可能性，有利于提高电芯极片10的结构完整性和传送过程安全性。
本实施例的第二转筒26的材质可以为铝合金、碳钎维、橡胶或镁铝合金中等材料。本实施例的第二转筒26通过轴承与芯轴23转动连接。在第二轴段26b靠近第二端面22的一侧设置挡圈以及端盖，以固定第二转筒26。传送辊20通过芯轴23的第一端部连接固定于其他安装平台上。本实施例的传送辊20还包括辊支架(图中未示出)。辊支架与芯轴23的第二端部相连接，用于对芯轴23提供额外支撑力，使得传送辊20高速转动时稳定性更好，有利于降低传送辊20振动，降低电芯极片10传送过程中出现抖动的可能性，提升电芯极片10传送过程的平稳性。
第三实施例：
在第一实施例和第二实施例中，对传送辊20的结构进行了说明。在本实施例中，主要说明与第一实施例和第二实施例的不同之处，相同的结构在本实施例中不再重复说明。
参见图7所示，本实施例的传送辊20还包括抚平部件27。抚平部件27与避空位25位置相对应地设置，电芯极片10的极耳12能够从抚平部件27和避空位25之间穿过，抚平部件27能够对极耳12施加朝向中心轴线20a的作用力，以抚平极耳12。由于传送辊20具有避空位25，并且抚平部件27的位置与避空位25相对应设置，因此抚平部件27和传送轴之间能够预留足够大的间隙。这样，电芯极片10的过渡区11b和极耳12能够容易地从该间隙穿过，并且与传送辊20和/或抚平部件27的碰撞、刮擦可能性较低，从而能够很大程度地降低电芯极片10穿带难度，同时保证穿带过程中电芯极片10的结构完整性，避免极耳12被刮裂或发生断裂，有效提高穿带效率，降低生产成本。当极耳12在离心力作用下发生外翻或弯折而与抚平部件27接触时，本实施例的抚平部件27能够对极耳12施加阻力，以保证电芯极片10传送过程中极耳12变形量小，阻止极耳12发生大幅度外翻或弯折，降低电芯极片10卷绕形成电芯后极耳12刺破隔离膜的可能性。
本实施例的抚平部件27包括第一抚平板27a和第二抚平板27b。第一抚平板27a和第二抚平板27b围绕中心轴线20a排布设置。第一抚平板27a和第二抚平板27b相互衔接，以使极耳12在通过第一抚平板27a后，能够继续受到第二抚平板27b的限制和约束。本实施例的第一抚平板27a和第二抚平板27b连接于转轴，该转轴的轴线与传送辊20的轴线重合。电芯极片10具有入辊侧的入辊片段以及出辊侧的出辊片段。入辊片段和出辊片段之间形成夹角。第一抚平板27a和第二抚平板27b两者可以围绕转轴任意旋转，以便于根据电芯极片10的入辊片段和出辊片段的夹角不同，灵活调整第一抚平板27a和第二抚平板27b的位置，从而保证极耳12与第一抚平板27a和第二抚平板27b保持接触状态且两者之间的接触力度保持均衡。
在传送辊20包括芯轴23的实施例中，本实施例的抚平部件27可以直接连接固定于芯轴23的第二端部。本实施例的抚平部件27也可以单独设置于其他安装平台上。
本实施例的传送辊20包括中心轴线20a、沿中心轴线20a相对设置的第一端面21和第二端面22、设置于第一端面21和第二端面22之间的传动部和避空位25。传动部和避空位25沿中心轴线20a排布。传动部能够围绕中心轴线20a自转。在传送辊20传送电芯极片10时，电芯极片10的支承区11a能够与传动部接触，以使传动部对电芯极片10施加传动摩擦力，从而电芯极片10在传动部的带动下移动。同时，传送辊20的避空位25能够避让电芯极片10的过渡区11b以及整个极耳12。这样，本实施例的传送辊20在传送电芯极片10的过程中，由于传送辊20具有避空位25，因此主体部11位于两个极耳12之间的凹凸不平的边缘不会与传送辊20接触。传送辊20不会对主体部11凹凸不平的边缘中的凸起区域施加挤压应力，从而极耳12不会在传送辊20挤压作用下向远离传送辊20的方向移动与凸起区域的凸出高度相同的距离，进而使得当传送辊20带动电芯极片10高速转动时，极耳12所承受的离心力不会增大，有效降低极耳12在离心力作用下朝远离传送辊20的方向外翻、折弯的可能性，降低隔离膜被外翻、折弯的极耳12刺破的可能性，提高卷绕形成的电芯的成品 率和后续使用的安全性。
参见图8所示，多个本实施例的传送辊20能够组成传送机构，以通过多个传送辊20改变电芯极片10的传送方向和传送过程张紧度。
本申请实施例还提出一种卷绕机。该卷绕机包括上述实施例的传送辊20。本实施例的卷绕机能够在传送辊20的作用下，有效降低极耳12在传送过程中出现外翻、弯折的可能性，从而降低电芯成品中极耳12刺破隔离膜的可能性，提高电芯成品的成品率。
本申请实施例还提出一种电芯极片传送方法，其中，采用如上述实施例的传送辊20传送电芯极片10。传动部对电芯极片10的支承区11a施加传动摩擦力以带动电芯极片10沿传动方向移动，且传送辊20的避空位25避让电芯极片10的过渡区11b和极耳12。该方法通过上述实施例的传送辊20传送电芯极片10，可以有效降低极耳12在传送过程中出现外翻、弯折的可能性，从而降低电芯成品中极耳12刺破隔离膜的可能性，提高电芯成品的成品率。
虽然已经参考优选实施例对本申请进行了描述，但在不脱离本申请的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (12)

  1. 一种传送辊，用于传送电芯极片，所述电芯极片包括主体部以及极耳，所述主体部包括支承区和过渡区，所述极耳具有根部、中间段和顶部，所述根部与所述过渡区相连接，其中，所述传送辊包括：
    中心轴线、沿所述中心轴线相对设置的第一端面和第二端面、设置于所述第一端面和所述第二端面之间的传动部和避空位，所述传动部能够围绕所述中心轴线自转，所述支承区能够与所述传动部接触，以使所述传动部对所述电芯极片施加传动摩擦力，所述避空位能够避让所述过渡区以及所述极耳。
  2. 根据权利要求1所述的传送辊，其中，所述传送辊包括芯轴，所述芯轴的轴线与所述中心轴线重合，所述传动部为套设于所述芯轴上的第一转筒，所述支承区能够与所述第一转筒的外周表面贴合，所述芯轴上沿所述中心轴线相对设置的两个端面分别形成所述第一端面和所述第二端面，所述第一转筒朝向所述第二端面的端面与所述第二端面之间的空间形成所述避空位。
  3. 根据权利要求2所述的传送辊，其中，所述第一转筒的半径与所述芯轴的半径差值范围为0.1mm至0.5mm。
  4. 根据权利要求2所述的传送辊，其中，所述第一转筒靠近所述第二端面的环形边缘具有圆角过渡结构。
  5. 根据权利要求1所述的传送辊，其中，所述传送辊包括芯轴以及套设于所述芯轴上的第二转筒，所述芯轴上沿所述中心轴线相对设置的两个端面分别形成所述第一端面和所述第二端面，所述第二转筒具有第一轴段和第二轴段，所述第一轴段的直径大于所述第二轴段，所述传动部为所述第一轴段，所述支承区能够与所述第一轴段的外周表面贴合，所述第一轴段的所述外周表面与所述第二轴段的外周表面之间的空间形成所述避空位。
  6. 根据权利要求5所述的传送辊，其中，所述第一轴段的半径与所述第二轴段的半径差值范围为0.1mm至0.5mm。
  7. 根据权利要求5所述的传送辊，其中，所述第一轴段朝向所述第二端面的端面与所述第二轴段朝向所述第二端面的端面之间的距离为5mm至30mm。
  8. 根据权利要求5所述的传送辊，其中，所述第一轴段靠近所述第二端面的环形边缘具有圆角过渡结构。
  9. 根据权利要求1至8任一项所述的传送辊，其中，所述传送辊还包括抚平部件，所述抚平部件与所述避空位位置相对应地设置，所述极耳能够从所述抚平部件和所述避空位之间穿过，所述抚平部件能够对所述极耳施加朝向所述中心轴线的作用力，以抚平所述极耳。
  10. 根据权利要求9所述的传送辊，其中，所述抚平部件包括第一抚平板和第二抚平板，所述第一抚平板和所述第二抚平板围绕所述中心轴线排布设置。
  11. 一种卷绕机，其中，包括如权利要求1至10任一项所述的传送辊。
  12. 一种电芯极片传送方法，其中，采用如权利要求1至10任一项所述的传送辊传送所述电芯极片，所述传动部对所述电芯极片的所述支承区施加传动摩擦力以带动所述电芯极片沿传动方向移动，且所述传送辊的所述避空位避让所述电芯极片的所述过渡区和所述极耳。
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