WO2023093338A1 - 压辊、辊压装置和极片的制造方法 - Google Patents

压辊、辊压装置和极片的制造方法 Download PDF

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Publication number
WO2023093338A1
WO2023093338A1 PCT/CN2022/124680 CN2022124680W WO2023093338A1 WO 2023093338 A1 WO2023093338 A1 WO 2023093338A1 CN 2022124680 W CN2022124680 W CN 2022124680W WO 2023093338 A1 WO2023093338 A1 WO 2023093338A1
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WO
WIPO (PCT)
Prior art keywords
pole piece
rolling
channel
support column
pressure roller
Prior art date
Application number
PCT/CN2022/124680
Other languages
English (en)
French (fr)
Inventor
郑超蜜
Original Assignee
宁德时代新能源科技股份有限公司
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Publication of WO2023093338A1 publication Critical patent/WO2023093338A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/46—Roll speed or drive motor control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/48—Tension control; Compression control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/56—Elongation control
    • 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
    • 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

Definitions

  • the present application relates to the technical field of battery production, and in particular to a pressing roller and a rolling device for rolling a pole piece of a battery, and a method for manufacturing the pole piece.
  • the manufacture of battery pole pieces is generally made by uniformly coating the slurry on both sides of the aluminum or copper current collector according to a certain surface density of the pole piece, and removing the solvent in the slurry by baking; Rolled to the specified thickness, then divided into strips and connected with tabs to form.
  • the middle and both sides of the pole piece coating area will produce the phenomenon of wavy edges of the pole piece, that is, abnormal winding correction or wrinkling, which will lead to poor quality of the pole piece or battery safety problems. Therefore, how to improve the wavy edge defects of battery pole pieces during production has become an urgent problem to be solved.
  • the present application provides a pressing roller for rolling battery pole pieces.
  • the first aspect of the present application provides a pressing roller for rolling an electrode sheet of a battery.
  • the pressing roller includes a main body, a rolling layer and an accommodating cavity.
  • the main body has channels for input or output of fluid.
  • the rolling layer is arranged on the outer side of the main body and is used for rolling the pole pieces.
  • the rolling layer and the outer surface of the main body form an accommodation chamber, which communicates with the channel.
  • the fluid is configured to flow into or out of the accommodating cavity through the channel to deform the rolled layer. Since the volume of the accommodating chamber is variable, the concave and convex state of the pressure roller can be changed accordingly, so that different roller pressures can be applied to different positions and different degrees of wavy edges on the pole piece.
  • the body portion includes an inner column and a support column.
  • the inner column is arranged inside the main body.
  • Support columns are used to support the rolled layers. One end of the support column is connected to the inner column, and the other end is connected to the rolled layer.
  • the inner column, the support column and the rolling layer jointly enclose the accommodation chamber.
  • the channel includes a first channel and a second channel.
  • the first channel is arranged in the inner cavity of the inner column, and the first channel extends along the axial direction of the inner column.
  • the second channel is arranged in the inner chamber of the support column, and the second channel extends along the radial direction of the support column.
  • the first channel communicates with the second channel, and the second channel communicates with the accommodation cavity, and the fluid enters the accommodation cavity through the first channel and the second channel to squeeze the rolling layer.
  • the support column includes a first support column and a second support column separated from each other, the first support column is a solid structure, and the second channel is disposed in the inner cavity of the second support column.
  • This embodiment can significantly enhance the structural strength of the pressure roller.
  • the second aspect of the present application provides a rolling device for a pole piece of a battery.
  • the rolling device includes a rolling module, and the rolling module includes the pressing roller according to any one of the above embodiments, and the pressing roller is used for rolling the pole piece.
  • the rolling module further includes a storage unit and a control unit.
  • the storage unit is configured to store fluid.
  • the control unit is used for controlling the storage unit to extract or inject fluid into the pressure roller.
  • the storage unit and the control unit can be configured to precisely control the concave-convex degree of the pressure roller, so that the wavy edge of the pole piece can be corrected more accurately.
  • the rolling device further includes a detection module, which is used to detect the elongation rate of the pole piece and feed it back to the control unit.
  • the configuration detection module can accurately collect the severity of the wavy edge defect of the pole piece, which is beneficial to the rolling module to accurately correct the wavy edge of the pole piece.
  • the detection module includes an encoding wheel set and an information processing unit.
  • the code wheel set is used to contact the pole piece and detect the elongation of the pole piece.
  • the information processing unit is used to collect the detection information of the encoding wheel set and feed it back to the control unit after processing.
  • the configuration of the encoding wheel set and the information processing unit can accurately collect the position of the wavy edge of the pole piece, which is beneficial to the rolling module to correct the wavy edge of the pole piece more accurately.
  • the detection module includes at least two sets of code wheels, one set of code wheels is set on the surface of the pole piece upstream of the pressure roller, and the other set of code wheels is set on the surface of the pole piece downstream of the pressure roller. Setting the code wheel set on the surface of the pole piece upstream and downstream of the pressure roller can know the correction effect of the pressure roller on the pole piece, which is beneficial to the rolling module to correct the wavy edge of the pole piece more accurately.
  • the third aspect of the present application provides a method for manufacturing a pole piece.
  • the manufacturing method includes providing a pole piece and providing the pressing roller according to any one of the above embodiments, and rolling the pole piece with the pressing roller.
  • Fig. 1 is a perspective view of a pressing roller for rolling battery pole pieces provided by the present application
  • Fig. 2 is the sectional view of pressure roller shown in Fig. 1;
  • Fig. 3 is the schematic diagram of the flat roll state, the concave roll state and the convex roll state of the pressure roller, wherein, Fig. 3 (a) is the schematic diagram of the concave roll state of the pressure roller, and Fig. 3 (b) is the schematic diagram of the flat roll state of the pressure roller Schematic diagram, Fig. 3 (c) is the schematic diagram of the convex roller state of pressure roller;
  • Fig. 4 is a structural schematic diagram of a rolling device for battery pole pieces provided by the present application.
  • Fig. 5 is a working schematic diagram of a coding wheel set provided by the present application.
  • FIG. 6 is a schematic flowchart of a method for manufacturing a pole piece provided by the present application.
  • 10 pressure rollers 11 main body, 110 channels, 1101 first channels, 1102 second channels, 111 inner columns, 112 support columns, 1121 first support columns, 1122 second support columns, 12 roller laminates, 13 accommodating chambers;
  • 200 detection module 210 encoding wheel set, 211 encoding wheel, 220 information processing unit;
  • the first feature may be in direct contact with the first feature or the second feature "on” or “under” the second feature. Indirect contact through intermediaries.
  • “above”, “above” and “above” the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.
  • “Below”, “beneath” and “beneath” the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.
  • the general rolling device can only solve the wavy edges at fixed positions in the pole piece film coating area, but cannot solve the wavy edges with complex positions that are not fixed. For example, after installation, the rolling device can only roll the wavy edge located in the middle of the pole piece coating area, but cannot handle the wavy edge located at the edge of the pole piece coating area.
  • the position of the wavy edge on the pole piece is not fixed. In some periods of time, the wavy edge may appear in the middle of the pole piece coating area, and after a period of time, the wavy edge may appear on the pole piece coating film. edge of the area.
  • the existing rolling device cannot solve the technical problems of the wavy edges of the pole pieces at various positions during the production process.
  • the pressure roller can be provided with a housing cavity under the outer rolling layer, and fluid such as hydraulic oil is injected into the housing cavity, and the roller pressure exerted by the rolling layer on the pole piece can be changed by changing the volume of the fluid in the housing cavity: a certain fluid volume , the pressure roller is a flat roller; on the basis of the fluid volume, the fluid is injected to make the pressure roller a convex roller; the fluid is drawn out to make the pressure roller a concave roller.
  • the above-mentioned concave-convex variable pressure roller can match the concavity and convexity of the roller according to the size and position of the wavy edge of the pole piece, so as to effectively correct the pole piece.
  • the present application provides a pressing roller 10 for rolling a pole piece 1 of a battery, a rolling device 1000 including the pressing roller 10 and a rolling method S100 for the pole piece 1 of a battery.
  • This pressing roller 10 is applicable to the pole piece 1 of any battery, such as primary battery and secondary battery, for example, secondary battery includes nickel metal hydride battery, nickel cadmium battery, lead-acid (or lead storage) battery, lithium ion battery, sodium Ion batteries, polymer batteries, etc.
  • FIG. 1 is a perspective view of a pressing roller 10 for rolling a pole piece 1 of a battery according to the first aspect of the present application
  • FIG. 2 is a cross-sectional view of the pressing roller 10 shown in FIG. 1
  • the pressing roller 10 includes a main body 11 , a rolling layer 12 and an accommodation chamber 13 .
  • the main body portion 11 has a channel 110 for the input or output of fluid.
  • the rolling layer 12 is disposed on the outside of the main body 11 and is used for rolling the pole piece 1 .
  • the rolling layer 12 and the outer surface of the main body 11 form an accommodating cavity 13 , and the accommodating cavity 13 communicates with the channel 110 .
  • the fluid is configured to flow into or out of the accommodation cavity 13 through the channel 110 to deform the rolled layer 12 .
  • the pressure roller 10 is a roller in which fluid is used as a transmission medium for roller pressure.
  • the pressure roller 10 exerts pressure indirectly on the outer pole piece through the fluid in the accommodation chamber 13 : the fluid in the accommodation chamber 13 exerts pressure on the rolling layer 12 , and the rolling layer 12 applies roller pressure on the pole piece 1 .
  • the fluid in the pressure roller 10 can be hydraulic oil or gas, and the hydraulic oil can be various mineral oils, emulsions, synthetic hydraulic oils or other achievable media, and the gas can be hydrogen or helium and other gases, and this application does not make specific limited.
  • the rolled layer 12 may be wrapped on the outside of the main body portion 11 .
  • the rolled layer 12 can be fixed in a fixing groove provided outside the main body 11 , or can be fixed on the outside of the main body 11 by gluing.
  • the rolling layer 12 is used to contact the pole piece 1 and roll the pole piece 1 .
  • the material of the rolled layer 12 can be elastic material such as rubber to be deformed when being squeezed by the fluid in the accommodating chamber 13 .
  • the elastic material can also prevent the rolled layer 12 from scratching the pole piece 1 when the rolled layer 12 is in contact with the pole piece 1 .
  • the main body 11 can be a simple structure such as a cylinder or a cuboid, or a complex structure in which one cylinder is sleeved on another cylinder.
  • the accommodation chamber 13 can be used to store fluids such as hydraulic oil.
  • the volume of the accommodation chamber 13 is variable.
  • the pressure roller 10 can be divided into three states: a flat roller state, a concave roller state and a convex roller state.
  • Fig. 3 is the schematic diagram of the flat roll state, concave roll state and convex roll state of pressure roller 10, wherein, Fig. 3 (a) is the schematic diagram of the concave roll state of pressure roller 10, Fig. 3 (b) is The schematic diagram of the flat roll state of the pressure roller 10, and FIG. 3(c) is the schematic diagram of the convex roll state of the pressure roller 10.
  • the outer diameter L1 of the rolled layer 12 is equal to the maximum outer diameter L2 of the main body 11; in the concave roll state, the outer diameter L1 of the rolled layer 12 is smaller than the maximum outer diameter L2 of the main body 11; In the rolled state, the outer diameter L1 of the rolled layer 12 is larger than the maximum outer diameter L2 of the main body portion 11 .
  • the concave-convex state of the pressure roller 10 can be changed accordingly, so that different roller pressures can be applied to different positions and different degrees of wavy edges on the surface of the pole piece 1 .
  • the main body 11 includes an inner column 111 and a supporting column 112 .
  • the inner column 111 is disposed inside the main body 11 .
  • the support columns 112 are used to support the rolled layer 12 .
  • One end of the support column 112 is connected to the inner column 111 , and the other end is connected to the rolled layer 12 .
  • the inner column 111 , the supporting column 112 and the rolled layer 12 jointly enclose the accommodation cavity 13 .
  • the inner column 111 can be configured as a hollow structure to store fluids such as hydraulic oil.
  • the inner column 111 can be a cylinder, the outer diameter of the inner column 111 can be smaller than the outer diameter of the rolled layer 12, the outer diameter of the inner column 111 can be smaller than the outer diameter of the supporting column 112, and the length of the inner column 111 can be greater than that of the rolled layer 12
  • the length of the inner column 111 may be smaller than the maximum outer diameter of the main body 11 .
  • the support column 112 may be in the form of a ring.
  • the center of the inner circle of the support column 112 may coincide with the center of the inner circle of the inner column 111 .
  • the inner diameter of the support column 112 may be equal to the diameter of the inner column 111 .
  • One end of the support column 112 connected to the inner column 111 may extend toward the rolled layer 12 along the radial direction Y of the inner column 111 and be connected to the rolled layer 12 .
  • the outer diameter of the support column 112 may be equal to the maximum outer diameter L2 of the main body 11 .
  • the channel 110 includes a first channel 1101 and a second channel 1102 .
  • the first channel 1101 is disposed in the inner cavity of the inner column 111 , and the first channel 1101 extends along the axis X of the inner column 111 .
  • the second channel 1102 is disposed in the inner cavity of the support column 112 , and the second channel 1102 extends along the radial direction Y of the support column 112 .
  • the first channel 1101 communicates with the second channel 1102
  • the second channel 1102 communicates with the accommodation cavity 13
  • the fluid enters the accommodation cavity 13 through the first channel 1101 and the second channel 1102 to squeeze the rolled layer 12 .
  • the inner diameter of the first channel 1101 may be smaller than the outer diameter of the inner column 111 .
  • the length of the first channel 1101 may be equal to the length of the inner column 111 .
  • the inner diameter of the second channel 1102 may be smaller than the outer diameter of the support column 112 .
  • the length of the second channel 1102 may be equal to the length of the support column 112 .
  • a plurality of first liquid inlet holes may be provided on the inner column 111 , and the first liquid inlet holes are used for injecting or extracting fluids such as hydraulic oil into the pressure roller 10 . Fluids such as hydraulic oil enter the first channel 1101 through the first liquid inlet hole.
  • the first liquid inlet hole may be circular, the diameter of the first liquid inlet hole may be equal to the diameter of the circular section of the first channel 1101 , and the diameter of the first liquid inlet hole may be smaller than the diameter of the circular section of the inner column 111 .
  • a plurality of second liquid inlet holes may be provided on the support column 112, and the second liquid inlet holes are used to communicate with the second passage 1102 and the accommodation chamber 13, so that fluids such as hydraulic oil It enters and exits the second channel 1102 and the accommodating cavity 13 .
  • the shape of the second liquid inlet hole may be circular, rectangular or star-shaped, and the diameter of the second liquid inlet hole may be smaller than the minimum distance between the rolled layer 12 and the inner column 111 .
  • a plurality of second liquid inlet holes may be provided on the support column 112 , and the plurality of second liquid inlet holes may be distributed and arranged around the inner column 111 .
  • the support column 112 includes a first support column 1121 and a second support column 1122 separated from each other, the first support column 1121 is a solid structure, and the second channel 1102 is arranged in the second support column 1122 cavity.
  • the first support column 1121 may be a solid structure, and another part of the support column 1122 may be a hollow structure including the second channel 1102 .
  • the first supporting columns 1121 and the second supporting columns 1122 may be arranged alternately.
  • the technical solution in which only part of the support columns 112 are set as hollow structures including the second channels 1102 can significantly enhance the structural strength of the pressing roller 10 .
  • FIG. 4 is a schematic structural diagram of a rolling device 1000 for a pole piece 1 of a battery provided in the second aspect of the present application.
  • the rolling device 1000 includes a rolling module 100 , and the rolling module 100 includes the pressing roller 10 in any one of the above embodiments, and the pressing roller 10 is used for rolling the pole piece 1 .
  • the rolling module 100 may further include a storage unit 20 and a control unit 30 .
  • the storage unit 20 is configured to store fluid.
  • the control unit 30 is used to control the storage unit 20 to extract or inject fluid into the pressure roller 10 .
  • the storage unit 20 may be a container including a cavity for storing fluid such as hydraulic oil.
  • the storage unit 20 may include a pipeline (not shown) connected to the pressure roller 10 .
  • the pipeline may communicate with the first channel 1101 .
  • the storage unit 20 can extract or inject the fluid that squeezes the rolling layer 12 from the first channel 1101 to the pressing roller 10 through a pipeline.
  • the control unit 30 is used to control the speed and volume of the storage unit 20 to extract or inject fluid into the pressure roller 10, so that the pressure roller 10 has different concave and convex degrees and switches between the flat roller state, the concave roller state and the convex roller state.
  • the configuration storage unit 20 and the control unit 30 can precisely control the concave-convex degree of the pressure roller 10, so that the wavy edge of the pole piece 1 can be corrected more accurately.
  • the rolling device 1000 further includes a detection module 200 for detecting the elongation of the pole piece 1 and feeding it back to the control unit 30 .
  • the elongation rate is the percentage of the ratio of the total deformation of the gauge section of the pole piece 1 after stretching to the length of the original gauge section.
  • the configuration detection module 200 can accurately collect the severity of the wavy edge defect of the pole piece 1 , which is beneficial for the rolling module 100 to accurately correct the wavy edge of the pole piece 1 .
  • the detection module 200 includes an encoding wheel set 210 and an information processing unit 220 .
  • the encoding wheel set 210 is used to contact the pole piece 1 and detect the elongation rate of the pole piece 1 .
  • the information processing unit 220 is used for collecting detection information of the encoding wheel set 210 and feeding it back to the control unit 30 after processing.
  • FIG. 5 is a working diagram of an encoding wheel set 210 provided in the present application.
  • a set of encoding wheels 210 may include at least two encoding wheels 211 respectively disposed on two sides of the pole piece 1 .
  • the code wheel 211 is a device that utilizes the linkage between the wheel disc and the conveying roller of the pole piece 1, calculates the number of turns, and converts to obtain the length and elongation of the current strip material of the pole piece 1.
  • the information processing unit 220 may include wires (not shown in the figure), and the wires are connected with the encoding wheel set 210 and the control unit 30 to transmit signals.
  • the information processing unit 220 processes the detection information after receiving the detection information of the encoding wheel set 210 , and feeds the processed information back to the control unit 30 , and the control unit 30 determines the degree of unevenness of the pressure roller 10 .
  • the arrangement of the encoding wheel set 210 and the information processing unit 220 can accurately collect the position of the wavy edge of the pole piece 1 , which is beneficial for the rolling module 100 to correct the wavy edge of the pole piece 1 more accurately.
  • the detection module 200 includes at least two sets of encoding wheels 210 .
  • One set of code wheel set 210 is arranged on the surface of the pole piece 1 upstream of the pressure roller 10, and another set of code wheel set 210 is set on the surface of the pole piece 1 downstream of the pressure roller 10.
  • the encoder wheel set 210 provided on the surface of the pole piece upstream of the pressure roller 10 is used to detect the position of the wave edge of the pole piece 1 , so that the rolling module 100 can adjust the state and degree of unevenness of the pressure roller 10 .
  • the code wheel set 210 arranged on the surface of the pole piece downstream of the pressure roller 10 is used to detect whether there are wavy edges on the surface of the pole piece 1 after being rolled by the pressure roller 10, and to detect the correcting effect of the pressure roller 10 on the pole piece 1, and Feedback is given to the rolling module 100 accordingly.
  • Setting the encoding wheel set 210 on the surface of the pole piece 1 upstream and downstream of the pressure roller 10 can collect the correction effect of the pressure roller 10 on the pole piece 1 , which is beneficial for the rolling module 100 to more accurately correct the wavy edge of the pole piece 1 .
  • the pole piece 1 may include at least two membrane regions 2 .
  • the code wheel set 210 may include at least 3 pairs of code wheels 211 .
  • Each pair of code wheels 211 includes two code wheels 211 respectively arranged on the two sides of the pole piece 1 .
  • the number of code wheel sets 210 corresponds to the number of film zones 2 , and each set of code wheel sets 210 is used to detect the elongation rate of the pole piece 1 in one film zone 2 .
  • one code wheel set 210 includes 3 pairs of code wheels 211
  • one pair of code wheels 211 can be placed in the middle of a single membrane area 2 , and the other two pairs can be placed on the left and right sides of the membrane area 2 respectively.
  • the film area 2 of the pole piece 1 refers to the area where a layer of film with positive and negative electrode specific materials is applied on the surface of the pole piece 1 .
  • the pole piece 1 can have a plurality of film regions 2 .
  • Each membrane area 2 can be provided with a set of encoder wheels 210 to detect the elongation rate of the pole piece 1 in the membrane area 2 .
  • each code wheel group 210 can include at least 3 pairs of code wheels 211, that is, three code wheels 211 are distributed on one side of the film area 2, and the other side of the film area 2 is also distributed on the relative position. There are three code wheels 211, and the three code wheels 211 are respectively arranged at the middle position and the edge positions on both sides of the film area 2.
  • the number of code wheel sets 210 corresponding to the number of film zones 2 means that each film zone 2 has at least one set of code wheel sets 210 for detecting the elongation rate of the pole piece 1 in the film zone 2 .
  • the detection module 200 may include 6 sets of code wheel sets 210, wherein 3 sets of code wheel sets 210 are respectively arranged on the 3 membrane areas 2 of the pole piece 1 in front of the pressure roller 10, and the other 3 sets of code wheel sets 210 are respectively set on On the three film regions 2 of the pole piece 1 after the pressing roller 10 .
  • the rolling device 1000 also includes a differential stretching module 300, and the differential stretching module 300 is used for preliminary stretching of the pole piece 1 before the pressing roller 10 is rolled. stretch processing.
  • the differential stretching module 300 includes a main drive roller, a swing roller, a tension roller, a two-stage (group) or three-stage (group) differential stretching mechanism, and several passing rollers for turning the pole piece 1; wherein, Each stage (group) of differential speed stretching mechanism includes several sets of differential speed rollers and rubber rollers that cooperate with each other to clamp the pole piece 1. Due to the different speeds of the differential speed rollers in the adjacent two stages of differential speed stretching mechanisms, the pole piece 1 travels The front differential speed roller rotates faster, thereby forming the stretching of the pole piece 1 .
  • the differential stretching module 300 can preliminarily correct the wavy edge of the pole piece 1 to improve the wavy edge state of the pole piece 1 so as to facilitate subsequent correction of the wavy edge of the pole piece 1 by the rolling module 100 .
  • the rolling device 1000 further includes a cold-pressing module 400 , and the cold-pressing module 400 is used to provide the cold-pressed pole piece 1 to the differential stretching module 300 .
  • the cold pressing module 400 includes cold pressing rolls.
  • the cold pressing of the pole piece 1 mostly adopts the rolling process.
  • the electrode membrane in the pole piece 1 has a low density after being coated with slurry and dried.
  • the pole piece 1 needs to be cooled. pressure.
  • the cold pressing speed during cold pressing may be 5m/min-50m/min
  • the cold pressing pressure may be 0.5MP-100MP
  • the cold-pressing gap may be 50 microns-1mm.
  • the cold pressing makes the active material of the pole piece 1 closely contact with the current collecting piece, reduces the thickness of the pole piece 1, increases the loading capacity and improves the utilization rate of the battery volume, thereby increasing the capacity of the battery.
  • the rolling device 1000 includes a rolling module 100 , a detection module 200 , a differential stretching module 300 and a cold pressing module 400 .
  • the rolling module 100 includes a pressing roller 10, a storage unit 20, and a control unit 30, and the control unit 30 is used to control the storage unit 20 to extract or inject fluid into the pressing roller 10, so that the pressing roller 10 can be in the flat roll state, concave roll state and Toggle between convex roll states.
  • the pole piece 1 includes three film regions 2
  • the detection module 200 includes six sets of encoding wheel sets 210 and an information processing unit 220 .
  • each code wheel set 210 includes at least 3 pairs of code wheels 211
  • each pair of code wheels 211 includes 2 code wheels 211 respectively arranged on both sides of the pole piece 1 .
  • FIG. 6 is a schematic flowchart of a method S1000 for manufacturing a pole piece 1 provided in the third aspect of the present application.
  • the manufacturing method S1000 includes providing the pole piece 1 , providing the pressing roller 10 in any one of the above embodiments, and using the pressing roller 10 to roll the pole piece 1 .
  • the rolling method S1000 of the battery electrode sheet 1 further includes:
  • the detection module 200 is used to detect the elongation of the pole piece 1;
  • the rolling module 100 is used for rolling the pole piece 1;
  • the detection module 200 includes an encoding wheel set 210 and an information processing unit 220: the encoding wheel set 210 is in contact with the pole piece 1 for detecting the elongation of the pole piece 1; the information processing unit 220 is used to collect the detection information of the encoding wheel set 210 and Feedback to the control unit 30 after processing;
  • the rolling module 100 includes the pressing roller 10, the storage unit 20 and the control unit 30 in the above-mentioned embodiment: the pressing roller 10 is used for rolling the pole piece 1; the storage unit 20 extracts or injects the pressing roller 10 through the first liquid inlet The fluid of the pressure roller lamination layer 12; the control unit 30 is used to control the storage unit 20 to extract or inject fluid into the pressure roller 10, so that the pressure roller 10 can be switched between the flat roller state, the concave roller state and the convex roller state;
  • the rolling method S1000 of the battery pole piece further includes:
  • pole piece 1 where the pole piece 1 includes at least two membrane regions 2;
  • the differential speed stretching module 300 is used to perform preliminary stretching treatment on the pole piece 1 before the pressure roller 10 is rolled;
  • the cold pressing module 400 is used to provide the cold pressed pole piece 1 to the differential stretching module 300 .
  • the rolling method S1000 of the battery pole piece 1 further includes the following step S60:
  • the pole piece 1 is stretched by the differential stretching module 300 after being cold-pressed by the cold-pressing module 400;
  • the encoding wheel set 210 detects the elongation rate of the pole piece 1 stretched by the differential stretching module 300 and rolled by the rolling module 100, and feeds back to the information processing unit 220;
  • the information processing unit 220 processes the feedback information of the encoding wheel set 210 and feeds it back to the control unit 30;
  • control unit 30 controls the storage unit 20 to extract or inject fluid into the pressing roller 10 according to the feedback information from the information processing unit 220, so that the pressing roller 10 is in a flat roller state, a concave roller state or a convex roller state.
  • S640 specifically includes the following steps:
  • the information processing unit 220 feeds back the judgment of S641 to the control unit 30;
  • the information processing unit 220 receives and processes the feedback information of the second encoding wheel set (that is, a set of encoding wheel set 210 arranged on the surface of the pole piece 1 behind the pressure roller 10): if the extension of the middle position and the edge position of the film area 2 If the ratios are not equal, then the information processing unit 220 judges that the rolling effect of the rolling module 100 is insufficient; if the elongation rates of the middle position and the edge position of the film area 2 are equal, then the information processing unit 220 judges that the rolling effect of the rolling module 100 is good;
  • the information processing unit feeds back the determination of S643 to the control unit 30.
  • S650 specifically includes the following steps:
  • S651 receiving and processing the judgment of S642: if the information processing unit 220 judges that the film area 2 has a wavy edge in the middle position, the control unit 30 controls the storage unit 20 to extract fluid from the pressure roller 10, so that the pressure roller 10 is in a concave roll state; if The information processing unit 220 judges that the film area 2 has a wavy edge at the edge position, then the control unit 30 controls the storage unit 20 to inject fluid into the pressure roller 10, so that the pressure roller 10 is in a convex roll state; if the information processing unit 220 judges that the film area 2 is in good condition , the control unit 30 controls the storage unit 20 to inject or extract fluid into the pressure roller 10, so that the pressure roller 10 is in a flat roller state;

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Abstract

一种用于辊压电池极片（1）的压辊（10），压辊包括主体部（11）、辊压层（12）和容纳腔（13），主体部具有通道（110），通道用于输入或输出流体，辊压层设置于主体部的外侧并用于辊压极片，辊压层与主体部的外表面形成容纳腔，容纳腔与通道连通，流体被配置为经由通道流入或流出容纳腔以使辊压层产生变形；一种电池极片的辊压装置（1000），包括辊压模块（100），辊压模块包括压辊；一种极片的制造方法，使用压辊辊压极片。由于容纳腔的容积大小是可变的，据此可以实现压辊凹凸状态的变化，从而实现对极片上不同位置和不同程度的波浪边施加不同的辊压力。

Description

压辊、辊压装置和极片的制造方法
相关申请的交叉引用
本申请要求享有于2021年11月29日提交的名称为“压辊、辊压装置和极片的制造方法”的中国专利申请202111473636.4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
本申请涉及电池生产的技术领域，尤其涉及一种用于辊压电池的极片的压辊和辊压装置，以及极片的制造方法。
背景技术
电池极片的制造一般为将浆料按照一定极片面密度均匀地涂覆在铝或铜集流体的两面，经烘烤去除浆料中的溶剂制成；成卷的极片经过对辊机连续辊压至指定厚度，再分条与极耳连接后成型。在制片过程中，极片涂膜区的中间和两侧会因为延展率的差异产生极片波浪边的现象，即卷绕纠偏异常或打皱，进而导致极片品质不良或电池安全问题。因此，如何改善电池极片在生产中的波浪边缺陷就成为亟待解决的一项问题。
发明内容
鉴于上述问题，本申请提供一种用于辊压电池极片的压辊。
本申请第一方面提供一种用于辊压电池的极片的压辊。压辊包括主体部、辊压层和容纳腔。主体部具有通道，通道用于输入或输出流体。辊压层设置于主体部的外侧并用于辊压极片，辊压层与主体部的外表面形成容纳腔，容纳腔 与通道连通。其中，流体被配置为经由通道流入或流出容纳腔以使辊压层产生变形。由于容纳腔的容积大小是可变的，据此可以实现压辊凹凸状态的变化，从而实现对极片上不同位置和不同程度的波浪边施加不同的辊压力。
可选地，主体部包括内柱和支撑柱。内柱设置于主体部的内部。支撑柱用于支撑辊压层。支撑柱的一端连接内柱，另一端连接辊压层。其中，内柱、支撑柱和辊压层共同围成容纳腔。
可选地，通道包括第一通道与第二通道。第一通道设置于内柱的内腔，第一通道沿内柱的轴向延伸。第二通道设置于支撑柱的内腔，第二通道沿支撑柱的径向延伸。其中，第一通道与第二通道相连通，第二通道与容纳腔相连通，流体经第一通道、第二通道进入容纳腔挤压辊压层。
可选地，支撑柱包括相互分离的第一支撑柱和第二支撑柱，第一支撑柱为实心结构，第二通道设置于第二支撑柱的内腔。本实施例能够显著增强压辊的结构强度。
本申请第二方面提供一种电池的极片的辊压装置。辊压装置包括辊压模块，辊压模块包括上述实施例中任一项的压辊，压辊用于辊压极片。
可选地，辊压模块还包括储存单元和控制单元。储存单元被配置为存储流体。控制单元用于控制储存单元向压辊抽取或注入流体。配置储存单元和控制单元可以精准地控制压辊的凹凸程度，从而可以更精准地纠正极片的波浪边。
可选地，辊压装置还包括检测模块，检测模块用于检测极片的延展率并反馈给控制单元。配置检测模块可以精准地收集极片的波浪边缺陷的严重程度，利于辊压模块精准地纠正极片的波浪边。
可选地，检测模块包括编码轮组和信息处理单元。编码轮组用于与极片相接触并检测极片的延展率。信息处理单元用于收集编码轮组的检测信息并经处理后反馈给控制单元。配置编码轮组和信息处理单元可以精准地收集极片的波浪边位置，利于辊压模块更精准地纠正极片的波浪边。
可选地，检测模块包括至少两组编码轮组，一组编码轮组设置于压辊上游 的极片表面，另一组编码轮组设置于压辊下游的极片表面。在压辊上下游的极片表面设置编码轮组可以知晓压辊对极片的纠正效果，利于辊压模块更精准地纠正极片的波浪边。
本申请第三方面提供一种极片的制造方法。制造方法包括提供极片和提供上述实施例中任一项的压辊，以及使用压辊辊压极片。
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上述和其它目的、特征和优点能够更明显易懂，以下特举本申请的具体实施方式。
附图说明
通过阅读下文优选实施方式的详细描述，各种其他的优点和益处对于本领域普通技术人员将变得清楚明了。附图仅用于示出优选实施方式的目的，而并不认为是对本申请的限制。而且在整个附图中，用相同的参考符号表示相同的部件。在附图中：
图1为本申请提供的一种辊压电池极片的压辊的透视图；
图2为图1所示压辊的剖视图；
图3为压辊的平辊状态、凹辊状态和凸辊状态的示意图，其中，图3(a)为压辊的凹辊状态的示意图，图3(b)为压辊的平辊状态的示意图，图3(c)为压辊的凸辊状态的示意图；
图4为本申请提供的一种电池极片的辊压装置的结构示意图；
图5为本申请提供的一种编码轮组的工作示意图；
图6为本申请提供的一种极片的制造方法的示意流程图。
具体实施方式中的附图标号如下：
1000辊压装置，1极片，2膜区；
10压辊，11主体部，110通道，1101第一通道，1102第二通道，111内 柱，112支撑柱，1121第一支撑柱，1122第二支撑柱，12辊压层，13容纳腔；
100辊压模块，20储存单元，30控制单元；
200检测模块，210编码轮组，211编码轮，220信息处理单元；
300差速拉伸模块，400冷压模块。
具体实施方式
下面将结合附图对本申请技术方案的实施例进行详细的描述。以下实施例仅用于更加清楚地说明本申请的技术方案，因此只作为示例，而不能以此来限制本申请的保护范围。
需要注意的是，除非另有说明，本申请实施例使用的技术术语或者科学术语应当为本申请实施例所属领域技术人员所理解的通常意义。
在本申请实施例的描述中，技术术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请实施例和简化描述，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实施例的限制。
此外，技术术语“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或者隐含指明所指示的技术特征的数量。在本申请实施例的描述中，“多个”的含义是两个以上，除非另有明确具体的限定。
在本申请实施例的描述中，除非另有明确的规定和限定，技术术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；也可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请实施例中的具体含义。
在本申请实施例的描述中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特征水平高度小于第二特征。
在现有的电池极片生产过程中，一般的辊压装置只能解决极片涂膜区中固定位置的波浪边，不能解决复杂位置不固定的波浪边。例如，辊压装置在安装后只能够辊压位于极片涂膜区中间位置的波浪边，无法处理位于极片涂膜区边缘位置的波浪边。但在实际生产中，波浪边在极片上的位置是不固定的，部分时间段内波浪边可能出现在极片涂膜区中间位置，再过一段时间后，波浪边可能出现在极片涂膜区的边缘位置。现有的辊压装置无法解决生产过程中产生的各种位置的极片波浪边的工艺问题。
申请人经研究发现，可以设计一种具有调节辊的凹凸位置和凹凸程度的压辊来解决上述问题。压辊可以在外层的辊压层下设置有容纳腔，容纳腔里面注入如液压油等流体，通过改变容纳腔内流体的体积大小可以改变辊压层对极片施加的辊压力：一定流体体积时，压辊是平辊；在此流体体积基础上，注入流体使压辊为凸辊；抽出流体使压辊为凹辊。上述凹凸可变的压辊，可以根据极片波浪边的大小及位置，匹配辊的凹度和凸度，以对极片进行有效的纠正。
本申请提供一种用于辊压电池的极片1的压辊10，以及包括这种压辊10的辊压装置1000和电池的极片1的辊压方法S100。这种压辊10适用于任何电池的极片1，例如一次电池和二次电池，例如，二次电池包括镍氢电池、镍镉电池、铅酸(或铅蓄)电池、锂离子电池、钠离子电池、聚合物电池等。
请参照图1和图2，图1为本申请第一方面提供的一种辊压电池的极片1的压辊10的透视图，图2为图1所示压辊10的剖视图。压辊10包括主体部11、辊压层12和容纳腔13。主体部11具有通道110，通道110用于输入或输 出流体。辊压层12设置于主体部11的外侧并用于辊压极片1，辊压层12与主体部11的外表面形成容纳腔13，容纳腔13与通道110连通。其中，流体被配置为经由通道110流入或流出容纳腔13以使辊压层12产生变形。
压辊10是以流体作为辊压力的传导介质的一种辊。压辊10通过容纳腔13内的流体对外部的极片间接施加压力：容纳腔13内的流体对辊压层12施加压力，辊压层12再对极片1施加辊压力。压辊10内的流体可以是液压油或气体，液压油可以是各种矿物油、乳化液和合成型液压油或其他可实现的介质，气体可以是氢气或氦气等气体，本申请不作具体限定。
辊压层12可以包裹在主体部11的外部。辊压层12可以固定在主体部11外部开设的固定槽中，也可以通过胶粘的方式固定在主体部11的外部。辊压层12用于与极片1相接触并辊压极片1。辊压层12的材质可以为橡胶等弹性材料以在受到容纳腔13内流体挤压时发生变形。弹性材料还能够在辊压层12与极片1接触时，防止辊压层12划伤极片1。
主体部11的至少部分可以被辊压层12包裹在内。主体部11可以呈现为圆柱体或长方体等简单结构，也可以呈现为一个圆柱体套设于另一个圆柱体上的复杂结构。
容纳腔13可以用于存储液压油等流体。容纳腔13的容积是可变的。
根据容纳腔13的容积不同，压辊10可以分为平辊状态、凹辊状态和凸辊状态三种状态。请参看图3，图3为压辊10的平辊状态、凹辊状态和凸辊状态的示意图，其中，图3(a)为压辊10的凹辊状态的示意图，图3(b)为压辊10的平辊状态的示意图，图3(c)为压辊10的凸辊状态的示意图。在平辊状态下，辊压层12的外径L1等于主体部11的最大外径L2；在凹辊状态下，辊压层12的外径L1小于主体部11的最大外径L2；在凸辊状态下，辊压层12的外径L1大于主体部11的最大外径L2。
由于容纳腔13的容积大小是可变的，据此可以实现压辊10凹凸状态的变化，从而实现对极片1表面不同位置和不同程度的波浪边施加不同的辊压力。
请参照图2，可选地，主体部11包括内柱111和支撑柱112。内柱111设置于主体部11的内部。支撑柱112用于支撑辊压层12。支撑柱112的一端连接内柱111，另一端连接辊压层12。其中，内柱111、支撑柱112和辊压层12共同围成容纳腔13。
内柱111可以设置为中空结构以存储液压油等流体。内柱111可以为圆柱体，内柱111的外径可以小于辊压层12的外径，内柱111的外径可以小于支撑柱112的外径，内柱111的长度可以大于辊压层12的长度，内柱111的外径可以小于主体部11的最大外径。
支撑柱112可以呈现为圆环的结构。支撑柱112的内圆圆心可以与内柱111的内圆圆心重合。支撑柱112的内圆直径可以等于内柱111的直径。支撑柱112连接内柱111的一端可以沿内柱111的径向Y朝辊压层12延伸并与辊压层12相连接。支撑柱112的外圆直径可以等于主体部11的最大外径L2。
请参照图2，可选地，通道110包括第一通道1101与第二通道1102。第一通道1101设置于内柱111的内腔，第一通道1101沿内柱111的轴向X延伸。第二通道1102设置于支撑柱112的内腔，第二通道1102沿支撑柱112的径向Y延伸。其中，第一通道1101与第二通道1102相连通，第二通道1102与容纳腔13相连通，流体经第一通道1101、第二通道1102进入容纳腔13挤压辊压层12。
第一通道1101的内径可以小于内柱111的外径。第一通道1101的长度可以等于内柱111的长度。
第二通道1102的内径可以小于支撑柱112的外径。第二通道1102的长度可以等于支撑柱112的长度。
在部分实施例中，内柱111上可以设置多个第一进液孔(图中未示出)，第一进液孔用于向压辊10注入或抽取液压油等流体。液压油等流体经第一进液孔进入第一通道1101。第一进液孔可以为圆形，第一进液孔的直径可以与第一通道1101的圆形截面的直径相等，第一进液孔的直径可以小于内柱111 的圆形截面的直径。
在部分实施例中，支撑柱112上可以设置多个第二进液孔(图中未示出)，第二进液孔用于连通第二通道1102与容纳腔13，以便于液压油等流体在第二通道1102与容纳腔13中进出。第二进液孔的形状可以为圆形或矩形或星形，第二进液孔的直径可以小于辊压层12与内柱111之间的最小距离。支撑柱112上可以设置有多个第二进液孔，多个第二进液孔可以围绕内柱111分布排列。
请参照图3，可选地，支撑柱112包括相互分离的第一支撑柱1121和第二支撑柱1122，第一支撑柱1121为实心结构，第二通道1102设置于第二支撑柱1122的内腔。
在部分实施例中，第一支撑柱1121可以为实心结构，另一部分支撑柱1122可以为包括第二通道1102的空心结构。第一支撑柱1121和第二支撑柱1122可以交替设置。
相较于全部支撑柱112为包括第二通道1102的空心结构的技术方案，仅部分支撑柱112设置为包括第二通道1102的空心结构的技术方案能够显著增强压辊10的结构强度。
请参照图4，图4为本申请第二方面提供的一种电池的极片1的辊压装置1000的结构示意图。辊压装置1000包括辊压模块100，辊压模块100包括上述实施例中任一项的压辊10，压辊10用于辊压极片1。
可选地，辊压模块100还可以包括储存单元20和控制单元30。储存单元20被配置为存储流体。控制单元30用于控制储存单元20向压辊10抽取或注入流体。
储存单元20可以是包括具有储存液压油等流体的腔体的容器，储存单元20可以包括与压辊10相连接的管道(图中未示出)，管道可以与第一通道1101相连通。储存单元20可以通过管道从第一通道1101向压辊10抽取或注入挤压辊压层12的流体。
控制单元30，用于控制储存单元20向压辊10抽取或注入流体的速度和 体积，使压辊10具有不同的凹凸程度以及在平辊状态、凹辊状态和凸辊状态之间切换。
配置储存单元20和控制单元30可以精准地控制压辊10的凹凸程度，从而可以更精准地纠正极片1的波浪边。
请参照图4，可选地，辊压装置1000还包括检测模块200，检测模块200用于检测极片1的延展率并反馈给控制单元30。
延展率即极片1经拉伸后标距段的总变形量与原标距段长度之比的百分数。通过检测极片1的延展率可以知晓极片1表面是否存在有波浪边缺陷，以及波浪边缺陷的严重程度。
配置检测模块200可以精准地收集极片1的波浪边缺陷的严重程度，利于辊压模块100精准地纠正极片1的波浪边。
请参照图4，可选地，其中，检测模块200包括编码轮组210和信息处理单元220。编码轮组210用于与极片1相接触并检测极片1的延展率。信息处理单元220用于收集编码轮组210的检测信息并经处理后反馈给控制单元30。
请参照图5，图5为本申请提供的一种编码轮组210的工作示意图。如图5所示，一组编码轮组210可以包括至少两个分别设置于极片1两侧的编码轮211。编码轮211是一种利用轮盘与极片1的输送转辊联动，计算圈数后换算得知当前极片1的带状材料长度和延展率的装置。
信息处理单元220可以包括导线(图中未示出)，导线与编码轮组210和控制单元30相连接以传递信号。信息处理单元220在接收到编码轮组210的检测信息后会对检测信息进行处理，并将处理后的信息反馈给控制单元30，由控制单元30决定压辊10的凹凸程度。
配置编码轮组210和信息处理单元220可以精准地收集极片1的波浪边位置，利于辊压模块100更精准地纠正极片1的波浪边。
请参照图4，可选地，检测模块200包括至少两组编码轮组210。一组编码轮组210设置于压辊10上游的极片1表面，另一组编码轮组210设置于压 辊10下游的极片1表面。
在压辊10上游的极片表面设置的编码轮组210用于检测极片1的波浪边的位置，以便于辊压模块100调整压辊10的状态和凹凸程度。在压辊10下游的极片表面设置的编码轮组210用于检测经压辊10辊压后的极片1表面是否还存在有波浪边，检测压辊10对极片1的纠正效果，并据此给予辊压模块100反馈。
在压辊10上下游的极片1表面设置编码轮组210可以收集压辊10对极片1的纠正效果，利于辊压模块100更精准地纠正极片1的波浪边。
在本申请的部分实施例中，极片1可以包括至少两个膜区2。编码轮组210可以包括至少3对编码轮211。每对编码轮211包括2个分别设置于极片1两侧表面的编码轮211。编码轮组210的数量与膜区2数量相对应，每组编码轮组210用于检测一个膜区2内极片1的延展率。在一组编码轮组210包括3对编码轮211的实施例中，一对编码轮211可以放置于单个膜区2的中间，另2对可以分别放置于膜区2的左右两边。
极片1的膜区2是指在极片1表面涂抹一层具有正负极特定材质的膜的区域。极片1在加工时可以具有多个膜区2。每个膜区2可以设置一组编码轮组210以检测该膜区2内极片1的延展率。
如图5所示，每组编码轮组210可以包括至少3对编码轮211，即膜区2的一侧分布有3个编码轮211，该膜区2的另一侧的相对位置上也分布有3个编码轮211，3个编码轮211分别设置于膜区2的中间位置和两侧边缘位置。
编码轮组210的数量与膜区2数量相对应是指，每个膜区2内至少有一组编码轮组210用于检测该膜区2内极片1的延展率。例如，检测模块200可以包括6组编码轮组210，其中3组编码轮组210分别设置于压辊10前的极片1的3个膜区2上，另3组编码轮组210分别设置于压辊10后的极片1的3个膜区2上。
在本申请的部分实施例中，如图4所示，辊压装置1000还包括差速拉伸 模块300，差速拉伸模块300用于对压辊10辊压前的极片1做初步拉伸处理。
差速拉伸模块300包括有主驱辊、摆辊、张力辊、两级(组)或者三级(组)的差速拉伸机构、以及若干用于极片1转向的过辊；其中，每级(组)差速拉伸机构包含若干套相互配合以夹持极片1的差速辊和胶辊，由于相邻两级差速拉伸机构中的差速辊转速不同，极片1行进前方的差速辊转速更快，从而形成对极片1的拉伸。
差速拉伸模块300可以对极片1的波浪边作初步纠正处理，改善极片1的波浪边状态，以便于后续辊压模块100对极片1的波浪边的纠正。
在本申请的部分实施例中，如图4所示，辊压装置1000还包括冷压模块400，冷压模块400用于向差速拉伸模块300提供冷压后的极片1。
冷压模块400包括冷压辊。极片1冷压多采用辊压工艺。电池生产工艺中，极片1中的电极膜片经过浆料涂布、干燥后的密度较低，为了提高电池的空间利用率，获得高能量密度的极片1，需对极片1进行冷压。冷压时的冷压速度可以为5m/min～50m/min，冷压压力可以为为0.5MP～100MP，冷压间隙可以为为50微米～1mm。冷压使极片1的活性物质与集流片接触紧密，降低极片1的厚度，增加装填量提高电池体积的利用率，从而提高电池的容量。
在本申请的部分实施例中，辊压装置1000包括有辊压模块100、检测模块200、差速拉伸模块300和冷压模块400。其中，辊压模块100包括压辊10、储存单元20和控制单元30，控制单元30用于控制储存单元20向压辊10抽取或注入流体，使压辊10在平辊状态、凹辊状态和凸辊状态之间切换。其中，极片1包括3个膜区2，因此检测模块200包括6组编码轮组210和信息处理单元220。其中3组编码轮组210设置于压辊10前的极片1的3个膜区2上，另3组编码轮组210设置于压辊10后的极片1的3个膜区2上。其中，每组编码轮组210包括至少3对编码轮211，每对编码轮211包括2个分别设置于极片1两侧的编码轮211。
请参照图6，图6为本申请第三方面提供的一种极片1的制造方法S1000 的示意流程图。制造方法S1000包括提供极片1、提供上述任一项实施例中的压辊10以及使用压辊10辊压极片1。
在本申请的部分实施例中，电池极片1的辊压方法S1000还包括：
S10、提供检测模块200，检测模块200用于检测极片1的延展率；
S20、提供辊压模块100，辊压模块100用于辊压极片1；
其中检测模块200包括编码轮组210和信息处理单元220：编码轮组210与极片1相接触用于检测极片1的延展率；信息处理单元220用于收集编码轮组210的检测信息并经处理后反馈给控制单元30；
辊压模块100包括上述实施例中的压辊10、储存单元20和控制单元30：压辊10用于辊压极片1；储存单元20通过第一进液孔向压辊10抽取或注入挤压辊压层12的流体；控制单元30用于控制储存单元20向压辊10抽取或注入流体，使压辊10在平辊状态、凹辊状态和凸辊状态之间切换；
可选地，电池极片的辊压方法S1000还包括：
S30、提供极片1，极片1包括至少两个膜区2；
S40、提供差速拉伸模块300，差速拉伸模块300用于对压辊10辊压前的极片1做初步拉伸处理；
S50、提供冷压模块400，冷压模块400用于向差速拉伸模块300提供冷压后的极片1。
可选地，电池极片1的辊压方法S1000还包括以下步骤S60：
S610、冷压模块400冷压极片1；
S620、极片1经冷压模块400冷压后被差速拉伸模块300拉伸；
S630、编码轮组210检测被差速拉伸模块300拉伸后和被辊压模块100辊压后的极片1的延展率并反馈给信息处理单元220；
S640、信息处理单元220处理编码轮组210的反馈信息并反馈给控制单元30；
S650、控制单元30根据信息处理单元220的反馈信息来控制储存单元20 向压辊10抽取或注入流体，使压辊10处于平辊状态或凹辊状态或凸辊状态。
可选地，其中S640具体包括以下步骤：
S641、接收并处理第一编码轮组(即设置于压辊10上游的极片1表面的一组编码轮组210，另一组编码轮组210设置于压辊10下游的极片1表面)的反馈信息：若膜区2中间位置延展率高，则信息处理单元220判断膜区2为中间具有波浪边；若膜区2边缘位置延展率高，则信息处理单元220判断膜区2为边缘具有波浪边；若膜区2中间位置和边缘位置的延展相等，则信息处理单元220判断膜区2状态良好；
S642、信息处理单元220将S641的判断反馈给控制单元30；
S643、信息处理单元220接收并处理第二编码轮组(即设置于压辊10后的极片1表面的一组编码轮组210)的反馈信息：若膜区2中间位置和边缘位置的延展率不相等，则信息处理单元220判断辊压模块100的辊压效果不足；若膜区2中间位置和边缘位置的延展率相等，则信息处理单元220判断辊压模块100的辊压效果良好；
S644、信息处理单元将S643的判断反馈给控制单元30。
可选地，S650具体包括以下步骤：
S651、接收并处理S642的判断：若信息处理单元220判断膜区2为中间位置具有波浪边，则控制单元30控制储存单元20向压辊10抽取流体，使压辊10处于凹辊状态；若信息处理单元220判断膜区2为边缘位置具有波浪边，则控制单元30控制储存单元20向压辊10注入流体，使压辊10处于凸辊状态；若信息处理单元220判断膜区2状态良好，则控制单元30控制储存单元20向压辊10注入或抽取流体，使压辊10处于平辊状态；
S652、接收并处理S644的判断：若信息处理单元220判断辊压模块100的辊压效果不足，则控制单元30控制储存单元20向压辊10抽取或注入更多流体，使压辊10的外径发生变化；若信息处理单元220判断辊压模块100的辊压效果良好，则控制单元30控制压辊10保持不变。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围，其均应涵盖在本申请的权利要求和说明书的范围当中。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 (10)

  1. 一种用于辊压电池的极片的压辊，其特征在于，包括：
    主体部，具有通道，所述通道用于输入或输出流体；
    辊压层，设置于所述主体部的外侧并用于辊压所述极片，所述辊压层与所述主体部的外表面形成容纳腔，所述容纳腔与所述通道连通；
    其中，所述流体被配置为经由所述通道流入或流出所述容纳腔以使所述辊压层产生变形。
  2. 根据权利要求1所述的压辊，其特征在于，所述主体部包括：
    内柱，设置于所述主体部的内部；
    支撑柱，用于支撑所述辊压层，所述支撑柱的一端连接所述内柱，另一端连接所述辊压层；
    其中，所述内柱、所述支撑柱和所述辊压层共同围成所述容纳腔。
  3. 根据权利要求2所述的压辊，其特征在于，所述通道包括：
    第一通道，设置于所述内柱的内腔，所述第一通道沿所述内柱的轴向延伸；
    第二通道，设置于所述支撑柱的内腔，所述第二通道沿所述支撑柱的径向延伸；
    其中，所述第一通道与所述第二通道相连通，所述第二通道与所述容纳腔相连通，所述流体经所述第一通道、所述第二通道进入所述容纳腔挤压所述辊压层。
  4. 根据权利要求3所述的压辊，其特征在于，所述支撑柱包括相互分离的第一支撑柱和第二支撑柱，所述第一支撑柱为实心结构，所述第二通道设置于所述第二支撑柱的内腔。
  5. 一种电池的极片的辊压装置，其特征在于，包括辊压模块，所述辊压模块包括如权利要求1-4任一项所述的压辊，所述压辊用于辊压所述极片。
  6. 根据权利要求5所述的辊压装置，其特征在于，所述辊压模块还包括：
    储存单元，被配置为存储流体；和
    控制单元，用于控制所述储存单元向所述压辊抽取或注入所述流体。
  7. 根据权利要求6所述的辊压装置，其特征在于，所述辊压装置还包括检测模块，所述检测模块用于检测所述极片的延展率并反馈给所述控制单元。
  8. 根据权利要求7所述的辊压装置，其特征在于，所述检测模块包括：
    编码轮组，用于与所述极片相接触并检测所述极片的延展率；和
    信息处理单元，用于收集所述编码轮组的检测信息并经处理后反馈给所述控制单元。
  9. 根据权利要求8所述的辊压装置，其特征在于，所述检测模块包括至少两组所述编码轮组，一组所述编码轮组设置于所述压辊上游的极片表面，另一组所述编码轮组设置于所述压辊下游的极片表面。
  10. 一种极片的制造方法，其特征在于：
    提供极片；
    提供如权利要求1-4任一项所述的压辊；
    使用所述压辊辊压所述极片。
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