WO2024016210A1 - 膜片制备装置及极片制造设备 - Google Patents

膜片制备装置及极片制造设备 Download PDF

Info

Publication number
WO2024016210A1
WO2024016210A1 PCT/CN2022/106724 CN2022106724W WO2024016210A1 WO 2024016210 A1 WO2024016210 A1 WO 2024016210A1 CN 2022106724 W CN2022106724 W CN 2022106724W WO 2024016210 A1 WO2024016210 A1 WO 2024016210A1
Authority
WO
WIPO (PCT)
Prior art keywords
screw
section
preparation device
active material
diaphragm
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2022/106724
Other languages
English (en)
French (fr)
Inventor
陆雷
余林真
王正
李世松
张盛武
李克强
邓凯明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co Ltd
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.)
Filing date
Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Priority to CN202280076672.3A priority Critical patent/CN118235264A/zh
Priority to EP22951488.0A priority patent/EP4517850A4/en
Priority to PCT/CN2022/106724 priority patent/WO2024016210A1/zh
Publication of WO2024016210A1 publication Critical patent/WO2024016210A1/zh
Priority to US18/885,084 priority patent/US20250001666A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/58—Details
    • B29C45/60—Screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/397—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using a single screw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/52—Screws with an outer diameter varying along the longitudinal axis, e.g. for obtaining different thread clearance
    • B29C48/525—Conical screws
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3468—Batteries, accumulators or fuel cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0411—Methods of deposition of the material by extrusion
    • 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 manufacturing, and in particular to a diaphragm preparation device and pole piece manufacturing equipment.
  • Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection.
  • battery technology is an important factor related to their development.
  • This application provides a diaphragm preparation device and pole piece manufacturing equipment.
  • the diaphragm preparation device can effectively improve the uniformity and continuity of the extruded diaphragm, thereby effectively improving the production quality of the battery.
  • the application provides a film preparation device, which includes a single screw machine and an extrusion die.
  • the single screw machine is used to transport the extruded active substance mixture, and the extrusion die is connected to the single screw machine.
  • the discharge end is used to extrude active material diaphragms; among them, the screw of the single-screw machine includes a compression section, the axial length of the compression section is L1, and the axial length of the screw is L, 0.45 ⁇ L1/L ⁇ 0.65.
  • the diaphragm preparation device continuously feeds the extrusion die through a single screw machine to provide extrusion power for the active material mixture.
  • the extrusion die shapes the active material mixture so that the active material mixture can be extruded and formed. It is a three-dimensional active material diaphragm.
  • the compression section of the screw in the single-screw machine plays a role in building pressure on the active material mixture, making the active material mixture denser and with better interface fusion, effectively improving the elasticity, extensibility and plasticity of the active material mixture, thereby reducing extrusion.
  • the active material mixture is hard in nature and easy to loose in structure.
  • the screw is particularly important in building pressure of the active material mixture. If the length of the compression section is too short, it will not be able to fully build up the pressure of the active material mixture, and thus cannot effectively improve the pressure. Due to the compactness and structural plasticity of the active material mixture, if the length of the compression section is too long, the length of the discharge section of the screw will be too short, which will not ensure the uniformity of the feed amount to the extrusion die, thus affecting the extrusion. Structural uniformity of the diaphragm.
  • the technical solution of this application is to design the length of the compression section of the screw to be 45% to 65% of the overall length of the screw, which can effectively ensure the structural density of the active substance mixture and at the same time, effectively ensure the amount of material supplied by the single-screw machine to the extrusion die. Continuous uniformity, thereby effectively ensuring the structural uniformity and structural continuity of the extruded diaphragm, effectively improving the production quality of the battery.
  • the length of the compression section of the screw is designed to be 54% to 58% of the overall length of the screw, which can further improve the structural density of the active substance mixture while effectively ensuring the amount of material supplied by the single-screw machine to the extrusion die. Continuous uniformity.
  • the compression ratio of the screw is ⁇ , 2 ⁇ 2.1, preferably, 2.05 ⁇ 2.08.
  • the compression ratio of the screw is related to the change of the thread groove depth of the compression section of the screw. The greater the compression ratio of the screw, the more fully the pressure build-up of the active material mixture will be, and the structural density and composition uniformity of the active material mixture will be better.
  • the compression ratio of the screw in this application is designed between 2 and 2.1, which can effectively improve the pressure-building effect of the single-screw machine on the active substance mixture, and at the same time, effectively ensure the processing capacity and extrusion volume of the single-screw machine .
  • 450mm ⁇ L1 ⁇ 500mm 450mm ⁇ L1 ⁇ 500mm.
  • the length of the compression section is 450mm to 500mm, which can fully exert the pressure-building effect on the active material mixture, ensure the structural compactness and composition uniformity of the active material mixture, and at the same time, avoid the screw being too long and affecting its structural strength. And cause the problem of excessive weight, thereby effectively reducing the risk of difficulty in manufacturing and installing single-screw machines.
  • the screw further includes a conveying section and a homogenizing section.
  • the conveying section, compression section and homogenizing section are arranged in sequence along the conveying direction of the screw.
  • the depth of the thread groove of the conveying section is greater than the depth of the thread groove of the homogenizing section.
  • the depth of the thread groove in the compression section gradually decreases from the conveying section to the homogenizing section.
  • the screw includes a conveying section, a compression section and a homogenizing section.
  • the conveying section is used to transport the active substance mixture from the feed end of the single-screw machine to the compression section.
  • the depth of the thread groove of the conveying section is greater than that of the homogenizing section.
  • the depth of the groove effectively ensures the material handling capacity and processing efficiency of the conveying section; the depth of the threaded groove of the compression section gradually decreases, the volume of the threaded groove gradually decreases, and the processing capacity of the active material mixture gradually decreases, so that the active material mixture can gradually Build pressure to increase the structural density of the active material mixture; the depth of the threaded groove in the homogenization section is minimal to transport the compacted active material mixture to the extrusion die at a uniform speed and amount.
  • the thread groove depth of the compression section is H2, 3mm ⁇ H2 ⁇ 10mm, preferably, 4mm ⁇ H2 ⁇ 9.8mm.
  • the thread groove depth of the compression section gradually decreases along the conveying direction of the screw in the range of greater than or equal to 3 mm and less than or equal to 10 mm.
  • This design ensures the screw compression ratio while avoiding excessive thread groove depth in the conveying section. If it is large, it will affect the structural strength of the screw, and avoid the depth of the thread groove in the homogenization section being too shallow, which will affect the feeding efficiency of the active material mixture.
  • the axial length of the conveying section is L2, 0.12 ⁇ L2/L ⁇ 0.4, preferably, 0.15 ⁇ L2/L ⁇ 0.35.
  • the length of the conveying section accounts for 12% to 40% of the total length of the screw, which can effectively ensure the conveying volume and conveying efficiency of the active substance mixture in the conveying section.
  • the axial length of the conveying section is L2, 200mm ⁇ L2 ⁇ 240mm, preferably, 215mm ⁇ L2 ⁇ 222mm.
  • the axial length of the conveying section is 200mm to 240mm, which can meet the demand for conveying efficiency of the active substance mixture and reduce the risk of accumulation and blockage of the active substance mixture at the feed end of the single-screw machine.
  • the depth of the thread groove of the conveying section is H1, and the outer diameter of the screw is D, which satisfies: H1>0.1D, preferably, H1>0.2D.
  • the depth of the threaded groove of the conveying section is greater than 10% of the outer diameter of the screw to effectively ensure the volume of the threaded groove of the conveying section, thereby effectively ensuring the conveying efficiency of the active substance mixture in the conveying section.
  • the depth of the threaded groove of the conveying section is H1, 9mm ⁇ H1 ⁇ 10mm, preferably, 9.5mm ⁇ H1 ⁇ 9.8mm.
  • the depth of the threaded groove of the conveying section is 9mm to 10mm, which can effectively ensure the conveying efficiency of the conveying section.
  • the axial length of the homogenization section is L3, 0.10 ⁇ L3/L ⁇ 0.30, preferably, 0.15 ⁇ L3/L ⁇ 0.25.
  • the axial length of the homogenization section accounts for 10% to 30% of the screw length, which can effectively ensure the uniformity and continuity of the feeding amount of the compacted active material mixture by the homogenization section.
  • the axial length of the homogenizing section is L3, 150mm ⁇ L3 ⁇ 200mm, preferably, 175mm ⁇ L3 ⁇ 185mm.
  • the axial length of the homogenization section is 150mm to 200mm, which can meet the production needs for continuous, quantitative and uniform extrusion of active substances and effectively ensure the extrusion effect of the single-screw machine.
  • the depth of the thread groove of the homogenizing section is H3, and the outer diameter of the screw is D, 0.02D ⁇ H3 ⁇ 0.15D, preferably, 0.08D ⁇ H3 ⁇ 0.1D.
  • the depth of the threaded groove in the homogenizing section accounts for 2% to 15% of the screw outer diameter, which can effectively ensure the transmission efficiency of the homogenizing section while avoiding the excessive volume of the threaded groove in the homogenizing section. Change the density of the active substance mixture to avoid affecting the uniformity and continuity of diaphragm extrusion.
  • the thread groove depth of the homogenizing section is H3, 3mm ⁇ H3 ⁇ 5mm, preferably, 3.8mm ⁇ H3 ⁇ 4.2mm.
  • the depth of the threaded groove of the homogenization section is 3mm to 5mm, which can effectively ensure the feeding effect of the active material mixture in the homogenization section.
  • the outer diameter of the screw is D, satisfying: 15 ⁇ L/D ⁇ 40, preferably, 18 ⁇ L/D ⁇ 25.
  • the length-to-diameter ratio of the screw is 15 to 40. If the length-to-diameter ratio of the screw is less than 15, it will affect the extrusion capacity and pressure-building capacity of the single-screw machine, thereby affecting the extrusion of the active material mixture into a diaphragm.
  • the aspect ratio of the screw is set between 15 and 40 It can effectively ensure the production quality of extrusion molding of active material mixture into diaphragms, while reducing the difficulty of manufacturing, installation and driving of single-screw machines, and effectively saving material costs.
  • the outer diameter of the screw is D, 40mm ⁇ D ⁇ 48mm, preferably, 44mm ⁇ D ⁇ 46mm.
  • the outer diameter of the screw is set to 40mm to 48mm, which can reduce the material cost of the single-screw machine while meeting the production quality of extrusion molding of the active material mixture into diaphragms.
  • the diaphragm preparation device also includes: a cone double forced feeder, which is connected to the feed end of the single screw machine and is used to continuously and stably supply materials to the single screw machine.
  • the cone double forced feeder The taper of the conical screw is C, 10° ⁇ C ⁇ 30°, preferably, 10° ⁇ C ⁇ 20°.
  • a cone-double forced feeder is connected to the feed end of the single-screw machine.
  • the cone-double forced feeder can evenly, continuously and forcibly feed the active material mixture with a pellet-like mesh structure.
  • Single-screw machine thereby effectively ensuring the continuity of the single-screw machine's delivery of active substance mixtures.
  • the taper of the conical screw is too small, the feeding speed of the conical screw is too slow and the forced feeding of the pellet material cannot be realized, thereby ensuring uniform and continuous feeding of the active substance mixture; and if the conical screw has If the taper is too large, the thread groove depth of the conical screw will be large, and the amount of material eaten will be too large, which will easily cause the material to be sheared repeatedly in the cone double forced feeder. This will not only easily lead to excessive shearing of the material, but also cause most of the material to be sheared. The material cannot be effectively transferred to the single screw and is taken away in time, which affects the continuity of the single screw conveying material. In addition, if the cone is too large, it will easily cause the material to bridge in the cone double forced feeding mechanism and be unable to enter the screw groove, so the forced feeding function cannot be realized.
  • the taper of the conical screw of the conical double forced feeder of this application is set between 10° and 30°, which can effectively ensure the uniformity and continuity of feeding the active substance mixture and reduce the risk of over-shearing of the material. , thereby improving the production quality of diaphragm extrusion.
  • the screw further includes a conveying section.
  • the conveying section is located upstream of the compression section.
  • the end of the conical screw is docked with the conveying section.
  • the depth of the thread groove at the end of the conical screw is H4, and the depth of the thread groove of the conveying section is H4. For H1, H4>H1.
  • the end of the conical screw is docked with the conveying section of the single-screw machine to force the active substance mixture into the conveying section of the single-screw machine.
  • the depth of the thread groove at the end of the conical screw is greater than the depth of the thread groove of the conveying section.
  • End-blocking material bridges affect the continuity of screw conveying; and the material is repeatedly sheared in the double-cone feeding mechanism, which can easily lead to excessive shearing of the material;
  • the depth of the thread groove in the conveying section is the thread groove at the end of the conical screw 75% to 90% of the depth can effectively reduce the risk of material blocking and material over-shearing, thereby ensuring the connectivity of the material conveying and the structural stability of the active material mixture, thereby improving the production quality of diaphragm extrusion.
  • this application also provides a pole piece manufacturing equipment, including: a kneading device for stirring and kneading the active material mixture; and a membrane preparation device as described in any of the above solutions, which is arranged downstream of the kneading device.
  • the sheet preparation device is used to extrude the active material mixture into an active material diaphragm; the composite device is provided downstream of the diaphragm preparation device, and the composite device is used to composite the base material and the active material diaphragm to form a pole piece.
  • the kneading device of the pole piece manufacturing equipment is used to fully mix and knead the various components for manufacturing the diaphragm into a lump-shaped active material mixture with a certain viscosity and plasticity, and then knead the lump-shaped active material mixture. It is sent to the diaphragm preparation device to be extruded into an active material diaphragm, and the composite device composites the active material diaphragm with the base material to prepare a pole piece.
  • the overall pole piece manufacturing equipment is highly integrated and can effectively improve the production quality and production efficiency of the pole pieces, thereby effectively improving the production quality of the battery.
  • Figure 1 is a structural front view of a membrane preparation device provided by some embodiments of the present application.
  • Figure 2 is a front view of the screw structure of a single screw machine provided by some embodiments of the present application.
  • Figure 3 is a front view of an extrusion die provided by some embodiments of the present application.
  • Figure 4 is a structural top view of a membrane preparation device provided by some embodiments of the present application.
  • Figure 5 is a front view of the conical screw of the conical double forced feeder provided by some embodiments of the present application.
  • Figure 6 is a schematic diagram of the overall structure of the pole piece manufacturing equipment provided by some embodiments of the present application.
  • Figure 7 is a simple structural schematic diagram of the pole piece manufacturing equipment provided by some embodiments of the present application.
  • Marking description 1000-pole piece manufacturing equipment; 100-diaphragm preparation device; 10-single screw machine; 11-screw; 111-conveying section; 112-compression section; 113-homogenizing section; 20-extrusion die; 21-die head body; 22-feed port; 23-lip; 30-cone double forced feeder; 31-conical screw; 200-composite device; 210-unwinding mechanism; 220-roller mechanism; 221 -pressure roller; 300-kneading device; 400-drying device; 500-active material film; 600-substrate.
  • an embodiment means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application.
  • the appearances of this phrase 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. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.
  • the term “plurality” refers to two or more (including two).
  • the electrode plate mentioned in this application is an important component of the battery cell.
  • the battery cell includes an electrode assembly.
  • the electrode assembly is composed of a positive electrode plate, a negative electrode plate and a separator. Battery cells mainly rely on the movement of metal ions between the positive and negative electrodes to work.
  • the electrode piece includes a current collector (that is, the base material as described below) and an active material layer.
  • the positive electrode piece includes a positive electrode current collector and a positive electrode active material layer.
  • the positive electrode active material layer is coated on the surface of the positive electrode current collector.
  • the cathode current collector not coated with the cathode active material layer protrudes from the cathode current collector coated with the cathode active material layer, and the cathode current collector uncoated with the cathode active material layer can serve as a cathode tab.
  • the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganate, etc.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector.
  • the negative electrode current collector that is not coated with the negative electrode active material layer protrudes from the negative electrode collector that is coated with the negative electrode active material layer. Fluid, the negative electrode current collector that is not coated with the negative electrode active material layer can be used as the negative electrode tab.
  • the material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon. In order to ensure that large currents can pass through without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.
  • the diaphragm mentioned in this application refers to a strip-shaped active material layer diaphragm formed by extrusion and shaping of the active material mixture.
  • the active material layer diaphragm is attached to the current collector to form a pole piece.
  • the battery cells suitable for the prepared pole pieces may include lithium ion secondary batteries, lithium ion primary batteries, lithium sulfur batteries, sodium lithium ion batteries, sodium ion batteries or magnesium ion batteries, etc., the embodiments of this application are Not limited.
  • pole pieces adopts a wet coating process, which mainly involves making a slurry of binder, active material, and conductive agent, and then wet-coating the slurry on the surface of the current collector.
  • the current collector then enters a high-temperature oven to dissolve the solvent. Evaporate to dryness to obtain the required pole piece.
  • some existing technical batteries use a dry process to prepare the pole pieces.
  • the dry process mainly involves mixing the electrode active material, conductive agent, and dry binder evenly. There is no need to add a large amount of solvent, and the electrode active material and conductive agent are bundled and fixed in the binder fiber grid by dry binder fiberization to form a network structure to prepare a self-supporting structure of the pole piece membrane, and then the pole piece is The membrane and current collector are combined to prepare battery pole pieces.
  • this process can theoretically effectively reduce drying energy consumption and cycle time, reduce environmental pollution, and is easy to manufacture thick pole pieces, reducing the risk of pole piece cracking; at the same time , can avoid the floating of the binder and improve the uniformity of the component distribution of the active material layer; overall, it can effectively improve the production efficiency and production quality of the pole piece, and is conducive to increasing the energy density of the battery.
  • the active material layer diaphragm prepared by the dry process still has the problems of poor extrusion uniformity, poor continuity and easy breakage of the diaphragm.
  • the inventor of the present application analyzed the reasons and found that: the structure of the active material mixture obtained after mixing the active material, conductive agent, solvent and binder is relatively loose. During the process of extruding the active material mixture into a film, it is easy to be extruded. Reasons such as insufficient continuous balance of power and poor flow uniformity of extruded materials result in problems such as poor structural uniformity of the extruded diaphragm and easy breakage, which seriously restricts the production quality of the pole piece.
  • the diaphragm preparation device includes a single screw machine and a single screw machine connected to the single screw machine.
  • the extrusion die at the discharge end of the screw machine.
  • the single screw machine is used to transport the extruded active material mixture, continuously and uniformly transport the active material mixture to the extrusion die, and at the same time provide continuous and balanced extrusion for the active material mixture.
  • the extrusion die shapes and extrudes the active material mixture to extrude an active material film with uniform structural distribution and strong continuity.
  • the compression section of the screw in the single-screw machine plays a strong and effective role in building pressure on the active material mixture, making the active material mixture denser and with better interface fusion, thereby effectively improving the elasticity, extensibility and elasticity of the active material mixture.
  • Plasticity can effectively reduce the risk of uneven structural distribution, poor continuity and easy breakage of extruded diaphragms.
  • the technical solution of this application is to design the length of the compression section of the screw to be 45% to 65% of the overall length of the screw, which can effectively ensure the structural density of the active substance mixture and at the same time, effectively ensure the amount of material supplied by the single-screw machine to the extrusion die. Continuous uniformity, thereby effectively ensuring the structural uniformity and structural continuity of the extruded diaphragm, effectively improving the production quality of the battery.
  • the diaphragm preparation device 100 disclosed in the embodiment of the present application can be used for, but is not limited to, the preparation of pole pieces. It can also be used for the preparation of various plastic diaphragms or the preparation process of extruded strip materials in other fields.
  • Figure 1 is a structural front view of a membrane preparation device 100 provided by some embodiments of the present application
  • Figure 2 is a structural front view of the screw 11 of a single screw machine 10 provided by some embodiments of the present application
  • Figure 3 is a front view of the extrusion die 20 provided in some embodiments of the present application.
  • the film preparation device 100 provided in some embodiments of the present application includes a single screw machine 10 and an extrusion die 20.
  • the single screw machine 10 is used to transport the extruded active material mixture.
  • the extrusion die 20 is connected to the outlet of the single screw machine 10.
  • the material end is used to extrude the active material diaphragm 500; wherein, the screw 11 of the single-screw machine 10 includes a compression section 112, the axial length of the compression section 112 is L1, and the axial length of the screw 11 is L, 0.45 ⁇ L1/ L ⁇ 0.65.
  • the single-screw machine 10 is also called a single-screw extruder.
  • the single-screw extruder mainly includes an extrusion system and a transmission system.
  • the extrusion system mainly includes a screw 11 and a barrel. The material moves in the barrel through the rotation of the screw 11.
  • the main function of the transmission system is to drive the rotation of the screw 11 and supply the torque and torque required by the screw 11 during the extrusion process.
  • the transmission system is usually composed of a motor, a reducer and a bearing.
  • the screw 11 of the conventional single screw machine 10 can be a basic screw mechanism, and the screw 11 can include a conveying section 111 (also called a feeding section), a compression section 112 and a homogenizing section 113 (also called a homogenizing section 113) that are sequentially arranged along the conveying direction of the screw 11 metering section).
  • the function of the compression section 112 is to compact the active material mixture and establish extrusion pressure.
  • the active material mixture is used to form the active material layer of the pole piece.
  • the active material mixture may be a mixture including electrode active materials, conductive agents, solvents, binders, etc. It can be understood that the active material mixture can be in the form of a lump, floc, and a certain viscosity, plasticity, and ductility structure.
  • the extrusion die 20 is used to shape the extrusion shape of the active material mixture, so that the active material mixture is extruded into a three-dimensional strip-shaped film structure.
  • the structure type of the extrusion die 20 is not particularly limited.
  • the extrusion die 20 can adopt a conventional plunger type structure, a hanger type structure, or a fishtail type structure, as long as the material is extruded uniformly to achieve the desired thickness of the diaphragm. Size required.
  • the extrusion die 20 may include a die body 21 installed at the discharge end of the single-screw machine 10 .
  • the die body 21 is provided with a feed port 22 and a feed port 22 connected to the feed port 22 .
  • the lip 23 and the feed port 22 are connected with the discharge end of the single-screw 11 extruder.
  • the cross-sectional shape of the lip 23 corresponds to the cross-sectional shape of the extruded diaphragm.
  • the active material mixture enters the die through the feed port 22.
  • the head body 21 is extruded into a diaphragm through the lip 23.
  • the thickness of the lip 23 (corresponding to the thickness of the active material diaphragm) can be selected from 1mm to 10mm, 2mm to 10mm, 3mm to 8mm, 4mm to 9mm, 4mm to 7mm, 4mm to 6mm, etc., for example, the thickness of the lip 23
  • the thickness can be 5mm.
  • the axial direction of the screw 11 extends along the first direction X
  • the length of the compression section 112 along the first direction X is L1
  • the total length of the screw 11 along the first direction X is L
  • the ratio of L1 to L Satisfies 0.45 ⁇ L1/L ⁇ 0.65.
  • L1/L can be any value greater than or equal to 0.45 and less than 0.65.
  • L1/L can be 0.45, 0.48, 0.55, 0.58, 0.65, etc.
  • the ratio of L1 to L satisfies 0.5 ⁇ L1/L ⁇ 0.6.
  • the film preparation device 100 continuously feeds the extrusion die 20 through the single screw machine 10 to provide extrusion power for the active material mixture.
  • the extrusion die 20 shapes the active material mixture so that the active material mixture can be extruded into a three-dimensional shape. shaped active material diaphragm 500.
  • the compression section 112 of the screw 11 in the single-screw machine 10 plays a role in building pressure on the active material mixture, making the active material mixture denser and having better interface fusion, effectively improving the elasticity, extensibility and plasticity of the active material mixture. , thereby reducing the risk of uneven material distribution, poor structural strength and easy breakage of the extruded diaphragm.
  • the active material mixture is hard in nature and easy to loose in structure.
  • the screw 11 is particularly important in building pressure of the active material mixture.
  • L1/L is less than 0.45
  • the active material mixture cannot fully pressurize the active material mixture.
  • the pressure-building effect cannot effectively improve the compactness and structural plasticity of the active material mixture.
  • the length of the compression section 112 is too long (L1/L is greater than 0.65)
  • the length of the discharge section of the screw 11 will be too short, thus The uniformity of the feeding amount to the extrusion die 20 cannot be guaranteed, thereby affecting the structural uniformity of the extruded diaphragm.
  • the technical solution of this application is to design the length of the compression section 112 of the screw 11 to be 45% to 65% of the overall length of the screw 11, which can effectively ensure the structural compactness of the active material mixture, and at the same time, effectively ensure the 10-direction extrusion die of the single-screw machine 20
  • the continuous uniformity of the feed amount effectively ensures the structural uniformity and structural continuity of the extruded diaphragm, which effectively improves the production quality of the battery.
  • the ratio L1/L of the length L1 of the compression section 112 along the first direction X to the total length L of the screw 11 along the first direction X may be greater than or equal to 0.54 and less than 0.58. Any value, for example, L1/L can be 0.54, 0.55, 0.56, 0.57, 0.58, etc. Preferably, L1/L is equal to 0.55.
  • the length of the compression section 112 of the screw 11 is designed to be 54% to 58% of the overall length of the screw 11, which can further improve the structural density of the active substance mixture while effectively ensuring the amount of material supplied by the single screw machine 10 to the extrusion die 20 Continuous uniformity.
  • the compression ratio of the screw 11 is ⁇ , 2 ⁇ 2.1, preferably, 2.05 ⁇ 2.08.
  • the screw 11 may include a conveying section 111, a compression section 112 and a homogenizing section 113 arranged sequentially along its conveying direction.
  • the compression ratio of the screw 11 is the sum of the volumes of the first thread groove of the conveying section 111 of the screw 11.
  • the calculation formula for the compression ratio of the screw 11 is:
  • D is the outer diameter of the screw 11
  • H1 is the thread groove depth of the first thread groove of the conveying section 111 (if the thread groove depth of the conveying section 111 is a constant value, then H1 is the conveying section 111)
  • H3 is the thread groove depth of the last thread groove of the homogenization section 113 (if the thread groove depth of the homogenization section 113 is a fixed value, H3 is the thread groove depth of the homogenization section 113).
  • the compression ratio ⁇ of the screw 11 can be any value greater than or equal to 2 and less than or equal to 2.1.
  • the compression ratio ⁇ of the screw 11 can be 2, 2.01, 2.02, 2.03, 2.04, 2.05, 2.06, 2.07, 2.08, 2.09, 2.0, 2.1, etc.
  • the compression ratio ⁇ of the screw 11 can be any value greater than or equal to 2.05 and less than or equal to 2.08.
  • the compression ratio ⁇ of the screw 11 can be 2.05, 2.055, 2.06, etc.
  • the compression ratio ⁇ of the screw 11 is 2.07.
  • the compression ratio of the screw 11 is related to the change in the thread groove depth of the compression section 112 of the screw 11.
  • 450mm ⁇ L1 ⁇ 500mm 450mm ⁇ L1 ⁇ 500mm.
  • the length L1 of the compression section along the first direction is 550mm.
  • the length of the compression section 112 is 450mm to 500mm, which can fully exert the pressure-building effect on the active substance mixture, ensure the structural compactness and composition uniformity of the active substance mixture, and at the same time, avoid the excessive length of the screw 11 from affecting its structural strength and causing its own damage.
  • the problem of excessive weight is eliminated, thereby effectively reducing the risk of manufacturing and installation difficulties of the single-screw machine 10.
  • the screw 11 also includes a conveying section 111 and a homogenizing section 113.
  • the conveying section 111, the compression section 112 and the homogenizing section 113 are arranged in sequence along the conveying direction of the screw 11.
  • the conveying section The depth of the threaded groove of 111 is greater than that of the homogenizing section 113, and the depth of the threaded groove of the compression section 112 gradually decreases from the conveying section 111 to the homogenizing section 113.
  • the conveying section 111 is used to convey the active material mixture from the feed end of the single screw machine 10 to the compression section 112 , and the homogenizing section 113 conveys the compacted active material mixture to the extrusion die 20 at a uniform speed and amount.
  • the thread groove depth of the conveying section 111 is greater than the thread groove depth of the homogenizing section 113, which effectively ensures the material processing capacity and processing efficiency of the conveying section 111; the thread groove depth of the compression section 112 gradually decreases, and its thread groove volume gradually becomes smaller, which is The processing volume of the active material mixture is gradually reduced, so that the pressure of the active material mixture can be gradually built up and the structural density of the active material mixture is increased; the depth of the threaded groove of the homogenization section 113 is minimum, so that the compacted active material mixture can be uniformly distributed at a uniform speed. Transported to the extrusion die 20.
  • the thread groove depth of the compression section 112 is H2, 3mm ⁇ H2 ⁇ 10mm, preferably, 4mm ⁇ H2 ⁇ 9.8mm.
  • the thread groove depth of the compression section 112 gradually decreases from the conveying section 111 to the homogenization section 113, so the thread groove depth H2 of the compression section 112 becomes a variable value.
  • 3mm ⁇ H2 ⁇ 10mm means that H2 can gradually decrease from any value greater than or equal to 3mm and less than or equal to 10mm to any value greater than or equal to 3mm.
  • H2 can be from H2 to greater than or equal to 4mm and less than or equal to 9.8mm. Any value gradually decreases to any value greater than or equal to 4mm.
  • the maximum value of H2 can be 9.6mm
  • the minimum value of H2 can be 4mm, that is, H2 gradually decreases from 9.6mm to 4mm.
  • the thread groove depth of the compression section gradually decreases along the conveying direction of the screw 11 within the range of greater than or equal to 3 mm and less than or equal to 10 mm.
  • This design while ensuring the compression ratio of the screw 11, prevents the thread groove depth of the conveying section 111 from being too large and causing It affects the structural strength of the screw 11 and prevents the thread groove depth of the homogenization section 113 from being too shallow and affecting the feeding efficiency of the active material mixture.
  • the axial length of the conveying section 111 is L2, 0.12 ⁇ L2/L ⁇ 0.4, preferably, 0.15 ⁇ L2/L ⁇ 0.35.
  • the axial direction of the screw 11 extends along the first direction X.
  • the length of the conveying section 111 along the first direction It is any value greater than or equal to 0.12 and less than or equal to 0.4.
  • L2/L can be 0.12, 0.13, 0.14, 0.2, 0.3, 0.4, etc.
  • the ratio of L2/L can be any value greater than or equal to 0.15 and less than or equal to 0.35.
  • L2/L can be 0.15, 0.16, 0.17, 0.2, 0.23, 0.25, 0.35, etc.
  • the ratio of L2/L is 0.25.
  • the length of the conveying section 111 accounts for 12% to 40% of the total length of the screw 11, which can effectively ensure the conveying volume and conveying efficiency of the active substance mixture by the conveying section 111.
  • the axial length of the conveying section 111 is L2, 200mm ⁇ L2 ⁇ 240mm, preferably, 215mm ⁇ L2 ⁇ 222mm.
  • L2 is 220mm.
  • the axial length of the conveying section 111 is 200 mm to 240 mm, which can meet the demand for conveying efficiency of the active material mixture and reduce the risk of accumulation and blockage of the active material mixture at the feed end of the single-screw machine 10 .
  • the depth of the thread groove of the conveying section 111 is H1, and the outer diameter of the screw 11 is D, which satisfies: H1>0.1D, preferably H1>0.2D.
  • the thread groove depth H1 of the conveying section 111 is a fixed value, and the outer diameter D of the screw 11 is also a fixed value.
  • H1 can be equal to 0.11D, 0.12D, 0.2D, 0.3D and other values greater than 0.1D.
  • H1 can be equal to 0.21D, 0.22D, 0.23D and other values greater than 0.2D.
  • H1 0.21D.
  • the depth of the threaded groove of the conveying section 111 is greater than 10% of the outer diameter of the screw 11 to effectively ensure the volume of the threaded groove of the conveying section 111 and thereby effectively ensure the conveying efficiency of the active substance mixture by the conveying section 111.
  • the thread groove depth of the conveying section 111 is H1, 9mm ⁇ H1 ⁇ 10mm, preferably, 9.5mm ⁇ H1 ⁇ 9.8mm.
  • H1 The thread groove depth of the conveying section is H1, which is a fixed value.
  • H1 can be any value greater than or equal to 9mm and less than or equal to 10mm.
  • H1 can be 9mm, 9.1mm, 9.2mm, 9.3mm, 9.4mm, 9.5mm, 9.8mm. , 10mm, etc.
  • H1 can be any value greater than or equal to 9.5mm and less than or equal to 9.8mm.
  • H1 can be 9.5mm, 9.6mm, 9.7mm, 9.75mm, 9.8mm, etc.
  • H1 is 9.6mm.
  • the depth of the threaded groove of the conveying section 111 is 9mm to 10mm, which can effectively ensure the conveying efficiency of the conveying section 111.
  • the axial length of the homogenizing section 113 is L3, 0.10 ⁇ L3/L ⁇ 0.30, preferably, 0.15 ⁇ L3/L ⁇ 0.25.
  • the axial direction of the screw 11 extends along the first direction X.
  • the length of the homogenizing section 113 along the first direction It can be any value greater than or equal to 0.10 and less than or equal to 0.30.
  • L3/L can be 0.10, 0.12, 0.13, 0.14, 0.2, 0.3, etc.
  • the ratio of L3/L can be any value greater than or equal to 0.15 and less than or equal to 0.25.
  • L3/L can be 0.15, 0.16, 0.17, 0.18, 0.2, 0.23, 0.25, etc.
  • the ratio of L3/L is 0.20.
  • the axial length of the homogenization section 113 accounts for 10% to 30% of the length of the screw 11, which can effectively ensure the uniformity and continuity of the feeding amount of the compacted active material mixture by the homogenization section 113.
  • the axial length of the homogenizing section 113 is L3, 150mm ⁇ L3 ⁇ 200mm, preferably, 175mm ⁇ L3 ⁇ 185mm.
  • L3 is 180mm.
  • the axial length of the homogenization section 113 is 150mm to 200mm, which can meet the production requirements for continuous, quantitative and uniform extrusion of active substances and effectively ensure the extrusion effect of the single-screw machine 10.
  • the depth of the thread groove of the homogenizing section 113 is H3, and the outer diameter of the screw 11 is D, 0.02D ⁇ H3 ⁇ 0.15D, preferably, 0.08D ⁇ H3 ⁇ 0.1D.
  • the thread groove depth H3 of the homogenization section is a constant value, and the outer diameter D of the screw 11 is also a constant value.
  • the thread groove depth H3 of the homogenization section 113 can be greater than or equal to 0.02D and less than or equal to 0.15D. Any value, for example, H3 can be equal to 0.02D, 0.03D, 0.04D, 0.05D, 0.08D, 0.09D, 0.1D, 0.15D, etc.
  • H3 can be any value greater than or equal to 0.08D and less than or equal to 0.1D.
  • H3 can be equal to 0.08D, 0.085D, 0.09D, 0.95D, etc.
  • H3 is 0.09D.
  • the depth of the thread groove of the homogenization section 113 accounts for 2% to 15% of the outer diameter of the screw 11, which can effectively ensure the transmission efficiency of the homogenization section 113 while avoiding excessive volume of the thread groove of the homogenization section 113.
  • Large and excessive changes in the density of the active substance mixture avoid affecting the uniformity and continuity of diaphragm extrusion.
  • the thread groove depth of the homogenizing section 113 is H3, 3mm ⁇ H3 ⁇ 5mm, preferably, 3.8mm ⁇ H3 ⁇ 4.2mm.
  • the thread groove depth H3 of the homogenizing section is a fixed value.
  • H3 can be any value greater than or equal to 3mm and less than or equal to 5mm.
  • H3 can be 3mm, 3.1mm, 3.2mm, 3.5mm, 4mm, 4.5mm, 5mm, etc.
  • H3 can be any value greater than or equal to 3.8mm and less than or equal to 4.2mm.
  • H3 can be 3.8mm, 3.9mm, 4mm, 4.1mm, 4.15mm, 4.2mm, etc.
  • H3 is 4mm.
  • the depth of the threaded groove of the homogenization section 113 is 3 mm to 5 mm, which can effectively ensure the feeding effect of the homogenization section 113 on the active material mixture.
  • the outer diameter of the screw 11 is D, satisfying: 15 ⁇ L/D ⁇ 40, preferably, 18 ⁇ L/D ⁇ 25.
  • L is the axial length of the screw
  • L/D is the aspect ratio of the screw 11.
  • the aspect ratio L/D of the screw 11 can be any value greater than or equal to 15 and less than or equal to 40, such as L /D can be 15,16,18,20,21,25,30,35,40, etc.
  • the aspect ratio L/D of the screw 11 can be any value greater than or equal to 18 and less than or equal to 25.
  • L/D can be 18, 19, 20.5, 22, 23, 24, 25, etc.
  • the aspect ratio L/D of the screw 11 is 20.
  • the length-to-diameter ratio of the screw 11 is 15 to 40. If the length-to-diameter ratio of the screw 11 is less than 15, it will affect the extrusion capacity and pressure building capacity of the single-screw machine 10, thereby affecting the extrusion molding of the active material mixture.
  • the length-to-diameter ratio is set between 15 and 40, which can effectively ensure the production quality of extrusion molding of the active material mixture into diaphragms, while reducing the manufacturing, installation, and driving difficulties of the single-screw machine 10 and effectively saving material costs.
  • the outer diameter of the screw 11 is D, 40mm ⁇ D ⁇ 48mm, preferably, 44mm ⁇ D ⁇ 46mm.
  • the outer diameter D of the screw 11 is a fixed value, and D can be any value greater than or equal to 40mm and less than or equal to 48mm.
  • D can be 40mm, 41mm, 42mm, 43mm, 47mm, 48mm, etc.
  • D can be any value greater than or equal to 44mm and less than or equal to 46mm.
  • D can be 44mm, 45mm, 45.5mm, 46mm, etc.
  • D is 45mm.
  • the outer diameter of the screw 11 is set to 40 mm to 48 mm, which can reduce the material cost of the single-screw machine 10 while meeting the production quality of extruding the active material mixture into a diaphragm.
  • Figure 4 is a structural top view of the film preparation device 100 provided by some embodiments of the present application
  • Figure 5 is a cone double forced feeding provided by some embodiments of the present application.
  • the front view of the conical screw 31 of the feeder 30; according to some embodiments of the present application, the film preparation device 100 also includes: a cone double forced feeder 30, connected to the feed end of the single screw machine 10, for feeding
  • the single screw machine 10 supplies materials
  • the taper of the conical screw 31 of the conical double forced feeder 30 is C, 10° ⁇ C ⁇ 30°, preferably, 10° ⁇ C ⁇ 20°.
  • the double cone forced feeder is a conventional forced feeding device.
  • the working principle and basic structure of the double cone forced feeder 30 will not be described in detail in the embodiment of this application.
  • the cone double forced feeder 30 includes two conical screws 31 arranged side by side, and the material is transported by the rotation of the two conical screws 31 .
  • connection between the cone double forced feeder 30 and the feed end of the single screw machine 10 means that the discharge end of the cone double forced feeder 30 is connected with the feed end of the single screw machine 10.
  • the active material mixture is evenly and forcefully added into the single screw machine 10 .
  • the taper C of the tapered screw 11 can be any value greater than or equal to 10° and less than or equal to 30°.
  • C can be 10°, 12°, 13°, 15°, 20°, 25°, 30°, etc.
  • the taper C of the conical screw 31 can be any value greater than or equal to 10° and less than or equal to 20°.
  • C can be 10°, 11°, 12°, 13°, 14°, 15°, 16°. 17°, 18°, 19°, 20°, etc.
  • the taper C of the conical screw 31 is 15°.
  • a cone double forced feeder 30 is connected to the feed end of the single screw machine 10.
  • the cone double forced feeder 30 can uniformly, continuously and force the active material mixture with a dough-shaped rib network structure. into the single-screw machine 10, thereby effectively ensuring the continuity of the single-screw machine 10 conveying the active material mixture.
  • the taper of the conical screw 31 If the taper of the conical screw 31 is too small, the feeding speed of the conical screw 31 is too slow and the forced feeding of the pellet material cannot be realized, so that the uniform and continuous feeding of the active substance mixture cannot be guaranteed; and if the conical screw 31 If the taper of the screw 31 is too large, the depth of the thread groove of the conical screw 31 will be large, and the amount of material eaten will be too large, which will easily cause most of the materials to be sheared repeatedly in the cone double forced feeder 30, which will not only easily lead to material shearing Excessive, and will cause most of the materials to be unable to be effectively transported to the single screw 11 and be taken away in time, affecting the continuity of the single screw conveying.
  • the taper of the conical screw 31 of the conical double forced feeder 30 of the present application is set between 105° and 30°, which can effectively ensure the uniformity and continuity of feeding the active material mixture and reduce material over-shearing. reduce risks and thereby improve the production quality of diaphragm extrusion.
  • the screw 11 also includes a conveying section 111.
  • the conveying section 111 is located upstream of the compression section 112.
  • the end of the conical screw 31 is docked with the conveying section 111.
  • the conical screw 31 The depth of the threaded groove at the end of the conveyor section 111 is H4, and the depth of the threaded groove of the conveying section 111 is H1, H4>H1.
  • the conveying section 111 is used to convey the active material mixture from the feed end of the single screw machine 10 to the compression section 112 .
  • the conveying section 111 is provided at the feed end of the single screw machine 10 and is located upstream of the compression section 112 .
  • the end of the conical screw 31 is docked with the conveying section 111 of the single screw machine 10 to force the active substance mixture into the conveying section 111 of the single screw machine 10.
  • the depth of the thread groove at the end of the conical screw 31 is greater than that of the conveying section 111 of the single screw machine 10.
  • the depth of the thread groove of section 111 ensures that the extrusion volume of the cone double forced feeder 30 is greater than the feeding volume of the single screw machine 10, so as to ensure that the screw 11 feeds enough material without pores, and further improves the continuous feeding of the active material mixture. Uniformity.
  • the thread groove depth of the conveying section is H1, which is a fixed value.
  • H1 can be any value greater than or equal to 0.75H4 and less than or equal to 0.9H4. That is to say, the ratio of H1/H4 can be any value greater than or equal to 0.75 and less than or equal to 0.9, such as , H1/H4 can be 0.75, 0.8, 0.85, 0.9, etc.
  • H1 can be any value greater than or equal to 0.77H4 and less than or equal to 0.8H4. That is to say, the ratio of H1/H4 can be any value greater than or equal to 0.77 and less than or equal to 0.8.
  • H1/H4 can be 0.77, 0.78. ,0.79,0.8 etc.
  • H1 0.78H4.
  • the depth of the thread groove of the conveying section 111 is 75% to 90% of the depth of the thread groove at the end of the conical screw 31, which can effectively reduce the risk of material blocking and over-shearing of materials, thereby ensuring the continuity of material conveying and the stability of the active substance mixture. Structural stability, thereby improving the production quality of diaphragm extrusion.
  • Figure 6 is a schematic diagram of the overall structure of the pole piece manufacturing equipment 1000 provided by some embodiments of the present application
  • Figure 7 is a schematic diagram of the pole piece manufacturing equipment provided by some embodiments of the present application.
  • the pole piece manufacturing equipment 1000 includes: a kneading device 300, used to stir and knead the active material mixture; the membrane preparation device 100 as described in any of the above solutions, is provided in Downstream of the kneading device 300, the film preparation device 100 is used to extrude the active material mixture into an active material film 500; the compounding device 200 is provided downstream of the film preparation device 100, and the compounding device 200 is used to composite the base material 600 and active material diaphragm 500 to form a pole piece.
  • the kneading device 300 can have a variety of implementation structures.
  • the kneading device 300 can use a kneader.
  • the kneader is a special mixing and stirring equipment.
  • the most commonly used structure is that the two mixing paddles adopt side-by-side tangent differential speeds. In a type arrangement, one stirring paddle is fast and the other is slow, so as to generate shearing force.
  • the different paddle speeds enable the mixed active substance mixture to be sheared quickly, so that the materials can be mixed evenly and formed into a lump. Or flocculent mesh structure.
  • the kneading device 300 may also use an internal mixer.
  • Kneaders and internal mixers are conventional production equipment in the field of industrial production, and their structures and principles will not be described in detail here.
  • the kneading device 300 is a kneader.
  • the diaphragm preparation device 100 is disposed downstream of the kneading device 300.
  • the active material mixture kneaded in the kneading device 300 is discharged from the kneading device 300 and sent to the diaphragm preparation device 100.
  • the active material mixture is extruded by the diaphragm preparation device 100. Shaped into diaphragm.
  • the composite device 200 is disposed downstream of the diaphragm preparation device 100.
  • the base material 600 and the diaphragm produced by the diaphragm preparation device 100 are composited to form a pole piece.
  • the composite device 200 can include a rolling mechanism 220 and an unwinding mechanism 210.
  • the rolling mechanism 220 can include at least a pair of pressure rollers 221, and a pair of pressure rollers 221 forms a gap between them.
  • the unwinding mechanism 210 can be disposed below the roller mechanism 220 and is responsible for unwinding the base material 600 .
  • the base material 600 and the diaphragm enter the lamination gap, and the pressure roller 221 rolls and laminates the base material 600 and the diaphragm.
  • the pole piece manufacturing equipment 1000 also includes a drying device 400.
  • the drying device 400 is provided downstream of the composite device 200 and is responsible for drying the pole pieces.
  • the kneading device 300 of the pole piece manufacturing equipment is used to fully mix and knead the various components for making the diaphragm into a lump-shaped active material mixture with a certain viscosity and plasticity, and then send the lump-shaped active material mixture into the diaphragm.
  • the preparation device 100 is extruded into an active material diaphragm 500, and the composite device 200 composites the active material diaphragm 500 with the base material 600 to prepare a pole piece.
  • the overall pole piece manufacturing equipment 1000 is highly integrated and can effectively improve the production quality and production efficiency of the pole pieces, thereby effectively improving the production quality of the battery.
  • the film preparation device 100 provided in some embodiments of the present application includes a single screw machine 10, an extrusion die 20 and a cone double forced feeder 30.
  • the single screw machine 10 is used to transport extrusion activity. Material mixture, the extrusion die 20 is connected to the discharge end of the single screw machine 10, used to extrude the active material diaphragm 500, the cone double forced feeder 30 is connected to the feed end of the single screw machine 10, used to Single screw machine 10 feeds.
  • the screw 11 of the single screw machine 10 includes a conveying section 111, a compression section 112 and a homogenizing section 113.
  • the conveying section 111, the compression section 112 and the homogenizing section 113 are arranged in sequence along the conveying direction of the screw 11.
  • the thread groove of the conveying section 111 The depth is greater than the depth of the threaded groove of the homogenizing section 113 , and the depth of the threaded groove of the compression section 112 gradually decreases from the conveying section 111 to the homogenizing section 113 .
  • the end of the conical screw 31 of the conical double forced feeder 30 is connected with the conveying section 111 of the single screw machine 10 .
  • the axial length of the screw 11 is L, and the outer diameter of the screw 11 is D; the axial length of the conveying section 111 is L1, and the thread groove depth of the conveying section 111 is H1; the axial length of the compression section 112 is L2, and the compression section 112
  • the depth of the thread groove is H2; the axial length of the homogenization section 113 is L3, and the depth of the thread groove of the homogenization section 113 is H3;
  • the compression ratio of the screw 11 is ⁇ ;
  • the conical screw 31 of the cone double forced feeder 30 is The taper is C, and the depth of the thread groove at the end of the conical screw 31 of the conical double forced feeder 30 is H4;

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

本申请提供一种膜片制备装置，包括单螺杆机和挤出模头，单螺杆机用于输送挤压活性物质混合物，挤出模头连接于单螺杆机的出料端，用于挤出活性物质膜片；其中，单螺杆机的螺杆包括压缩段，压缩段的轴向长度为L1，螺杆的轴向长度为L，0.45≤L1/L≤0.65。本申请技术方案可有效保证活性物质混合物的结构致密性，同时，有效保证单螺杆机向挤出模头供料量的连续均匀性，从而有效保证挤出膜片的结构均匀性和结构连续性，使得电池的生产质量得以有效提高。

Description

膜片制备装置及极片制造设备 技术领域
本申请涉及电池制造技术领域，特别是涉及一种膜片制备装置及极片制造设备。
背景技术
节能减排是汽车产业可持续发展的关键，电动车辆由于其节能环保的优势成为汽车产业可持续发展的重要组成部分。对于电动车辆而言，电池技术又是关乎其发展的一项重要因素。
在电池生产中，如何提高电池的生产质量，是一个亟需解决的问题。
发明内容
本申请提供一种膜片制备装置及极片制造设备，该膜片制备装置能够有效提高挤出膜片的均匀性和连续性，从而有效提高电池的生产质量。
第一方面，第一方面，本申请提供了一种膜片制备装置，包括单螺杆机和挤出模头，单螺杆机用于输送挤压活性物质混合物，挤出模头连接于单螺杆机的出料端，用于挤出活性物质膜片；其中，单螺杆机的螺杆包括压缩段，压缩段的轴向长度为L1，螺杆的轴向长度为L，0.45≤L1/L≤0.65。
本申请技术方案中，膜片制备装置通过单螺杆机向挤出模头连续性送料，为活性物质混合物提供挤出动力，挤出模头对活性物质混合物整形，使得活性物质混合物得以挤出成型为立体状的活性物质膜片。其中，单螺杆机内的螺杆的压缩段对活性物质混合物起到建压作用，使得活性物质混合物更加密实、界面融合性更好，有效提高活性物质混合物的弹性、延伸性和可塑性，从而降低挤出膜片的物料分布不均匀、结构强度差、易断裂的风险。
并且，活性物质混合物性质较硬、结构易松散，螺杆对活性物质混合物的建压尤为重要，如果压缩段的长度过短，则无法对活性物质混合物起到充分的建压作用，从而无法有效提高活性物质混合物的密实性和结构可塑性，如果压缩段的长度过长，则会导致螺杆的出料段的长度过短，从而无法保证对挤出模头的输料量的均匀性，进而影响挤出膜片的结构均匀性。本申请技术方案将螺杆的压缩段的长度设计为螺杆总体长度的45％至65％，可有效保证活性物质混合物的结构致密性，同时，有效保证单螺杆机向挤出模头供料量的连续均匀性，从而有效保证挤出膜片的结构均匀性和结构连续性，使得电池的生产质量得以有效提高。
根据本申请的一些实施例，0.54≤L1/L≤0.58。
上述技术方案中，螺杆的压缩段的长度设计为螺杆总体长度的54％至58％，可进一步在提高活性物质混合物的结构致密性的同时，有效保证单螺杆机向挤出模头供 料量的连续均匀性。
根据本申请的一些实施例，螺杆的压缩比为ε，2≤ε≤2.1，优选地，2.05≤ε≤2.08。
上述技术方案中，螺杆的压缩比与螺杆的压缩段的螺纹槽深度的变化相关，螺杆的压缩比越大，对活性物质混合物的建压越充分，活性物质混合物的结构致密性和成分均一性更强，可有效降低挤出膜片的结构不均匀、结构强度低、易断裂的风险；然而，螺杆的压缩比过大会使螺杆强度降低，容易导致螺杆在较大扭力下剪断，所以会限制螺杆转速和处理量，本申请的螺杆的压缩比设计在2至2.1之间，可有效提高单螺杆机对活性物质混合物的建压作用，同时，有效保证单螺杆机的处理量和挤出量。
根据本申请的一些实施例，450mm≤L1≤500mm。
上述技术方案中，压缩段的长度为450mm至500mm，可充分发挥对活性物质混合物的建压作用，保证活性物质混合物的结构致密性和成分均一性，同时，避免螺杆过长而影响自身结构强度并造成自身重量过大的问题，从而有效降低单螺杆机制造和安装困难的风险。
根据本申请的一些实施例，螺杆还包括输送段和均化段，输送段、压缩段和均化段沿螺杆的输送方向依次排列，输送段的螺纹槽深度大于均化段的螺纹槽深度，压缩段的螺纹槽深度由输送段向均化段逐渐减小。
上述技术方案中，螺杆包括输送段、压缩段和均化段，输送段用于将活性物质混合物从单螺杆机的进料端向压缩段输送，输送段的螺纹槽深度大于均化段的螺纹槽深度，有效保证输送段的物料处理量和处理效率；压缩段的螺纹槽深度逐渐减小，其螺纹槽容积逐渐变小，对活性物质混合物的处理量逐渐减小，使得活性物质混合物能够逐步建压，增加活性物质混合物的结构致密性；均化段的螺纹槽深度最小，以将压实的活性物质混合物匀速匀量的向挤出模头输送。
根据本申请的一些实施例，压缩段的螺纹槽深度为H2，3mm≤H2≤10mm，优选地，4mm≤H2≤9.8mm。
上述技术方案中，压缩段的螺纹槽深度在大于等于3mm并小于等于10mm的区间内沿螺杆的输送方向逐渐减小，这样的设计，在保证螺杆压缩比的同时，避免输送段螺纹槽深度过大而影响螺杆结构强度，并避免均化段螺纹槽深度太浅而影响活性物质混合物的输料效率。
根据本申请的一些实施例，输送段的轴向长度为L2，0.12≤L2/L≤0.4，优选地，0.15≤L2/L≤0.35。
上述技术方案中，输送段的长度占螺杆总长度的12％至40％，可有效保证输送段对活性物质混合物的输送量和输送效率。
根据本申请的一些实施例，输送段的轴向长度为L2，200mm≤L2≤240mm，优选地，215mm≤L2≤222mm。
上述技术方案中，输送段的轴向长度为200mm至240mm，可满足对活性物质混合物的输送效率需求，降低活性物质混合物在单螺杆机进料端堆积、堵料的风险。
根据本申请的一些实施例，输送段的螺纹槽深度为H1，螺杆的外径为D，满 足：H1＞0.1D，优选地，H1＞0.2D。
上述技术方案中，输送段的螺纹槽的深度大于螺杆外径的10％，以有效保证输送段的螺纹槽的容积，从而有效保证输送段对活性物质混合物的输送效率。
根据本申请的一些实施例，输送段的螺纹槽深度为H1，9mm≤H1≤10mm，优选地，9.5mm≤H1≤9.8mm。
上述技术方案中，输送段的螺纹槽深度为9mm至10mm，可有效保证输送段的输送效率。
根据本申请的一些实施例，均化段的轴向长度为L3，0.10≤L3/L≤0.30，优选地，0.15≤L3/L≤0.25。
上述技术方案中，均化段的轴向长度占螺杆长度的10％至30％，可有效保证均化段对压实后的活性物质混合物的输料量的均匀性和连续性。
根据本申请的一些实施例，均化段的轴向长度为L3，150mm≤L3≤200mm，优选地，175mm≤L3≤185mm。
上述技术方案中，均化段的轴向长度为150mm至200mm，可满足对活性物质连续、定量、均匀挤出的生产需求，有效保证单螺杆机的挤出效果。
根据本申请的一些实施例，均化段的螺纹槽深度为H3，螺杆的外径为D，0.02D≤H3≤0.15D，优选地，0.08D≤H3≤0.1D。
上述技术方案中，均化段的螺纹槽的深度占螺杆外径的2％至15％，可在有效保证均化段的传送效率的同时，避免均化段的螺纹槽容积过大而过多改变活性物质混合物的致密性，避免影响膜片挤出的均匀性和连续性。
根据本申请的一些实施例，均化段的螺纹槽深度为H3，3mm≤H3≤5mm，优选地，3.8mm≤H3≤4.2mm。
上述技术方案中，均化段的螺纹槽深度为3mm至5mm，可有效保证均化段对活性物质混合物的输料效果。
根据本申请的一些实施例，螺杆的外径为D，满足：15≤L/D≤40，优选地，18≤L/D≤25。
上述技术方案中，螺杆的长径比为15至40，如果螺杆的长径比小于15，会影响单螺杆机的挤出能力和建压能力，从而影响活性物质混合物挤出成型为膜片的质量，而如果螺杆的长径比大于40，则会影响螺杆的结构强度，限制螺杆转速和处理量，并会因螺杆过长而增加制造、安装难度；螺杆的长径比设置在15至40之间，可在有效保证活性物质混合物挤出成型为膜片的生产质量的同时降低单螺杆机的制造、安装、驱动难度，且有效节省物料成本。
根据本申请的一些实施例，螺杆的外径为D，40mm≤D≤48mm，优选地，44mm≤D≤46mm。
上述技术方案中，螺杆的外径设置为40mm至48mm，可在满足活性物质混合物挤出成型为膜片的生产质量的同时降低单螺杆机的物料成本。
根据本申请的一些实施例，膜片制备装置还包括：锥双强制喂料机，与单螺杆机的进料端连通，用于向单螺杆机连续稳定供料，锥双强制喂料机的锥形螺杆的锥度 为C，10°≤C≤30°，优选地，10°≤C≤20°。
上述技术方案中，在单螺杆机的进料端连接锥双强制喂料机，锥双强制喂料机能够将团状的筋网结构的活性物质混合物均量的、连续的、强制的送入单螺杆机，从而有效保证单螺杆机对活性物质混合物输送的连续性。如果锥形螺杆的锥度过小，则锥形螺杆的喂料速度过慢且无法实现团状料的强制喂料，从而无法保证活性物质混合物的均量、连续喂料；而如果锥形螺杆的锥度过大，则锥形螺杆的螺纹槽深度大，其吃料量过大，易导致物料在锥双强制喂料机内反复循环剪切，不仅容易导致物料剪切过度，且会导致大部分物料无法有效传送至单螺杆中而被及时带走，影响单螺杆输料的连续性。此外，如果锥度过大也容易导致物料在锥双强制喂料机构中架桥而无法进入螺槽中，因此无法实现强制喂料功能。
本申请的锥双强制喂料机的锥形螺杆的锥度设置在10°至30°之间，可有效保证其对活性物质混合物的喂料均量性及连续性，且降低物料过剪切风险，进而提高膜片挤出的生产质量。
根据本申请的一些实施例，螺杆还包括输送段，输送段位于压缩段的上游，锥形螺杆的末端与输送段对接，锥形螺杆的末端的螺纹槽深度为H4，输送段的螺纹槽深度为H1，H4＞H1。
上述技术方案中，锥形螺杆的末端与单螺杆机的输送段对接，以将活性物质混合物强制导入单螺杆机的输送段，锥形螺杆的末端的螺纹槽深度大于输送段的螺纹槽深度，保证锥双强制喂料机的挤出量大于单螺杆机的吃料量，以保证螺杆吃料充足，没有孔隙，进一步提高活性物质混合物的供料的连续均匀性。
根据本申请的一些实施例，0.75H4≤H1≤0.9H4，优选地，0.77H4≤H1≤0.8H4。
上述技术方案中，如果输送段的螺纹槽深度与锥形螺杆的末端的螺纹槽深度差值过大，同样会导致大部分物料无法被单螺杆机及时带走，物料容易在单螺杆机的进料端堵料架桥，影响螺杆输料的连续性；且物料在双锥喂料机构内反复循环剪切，容易导致物料剪切过度；输送段的螺纹槽深度为锥形螺杆的末端的螺纹槽深度的75％至90％，可有效降低堵料风险和物料过剪切风险，从而保证输料的连接性和活性物质混合物的结构稳定性，进而提高膜片挤出的生产质量。
第二方面，本申请还提供了一种极片制造设备，包括：捏合装置，用于搅拌捏合活性物质混合物；如上述任一方案所述的膜片制备装置，设置于捏合装置的下游，膜片制备装置用于将活性物质混合物挤出成型为活性物质膜片；复合装置，设置于膜片制备装置的下游，复合装置用于复合基材与活性物质膜片，以形成极片。
上述技术方案中，极片制造设备的捏合装置用于预先将制造膜片的各组成物充分混合、捏合为具有一定黏性和可塑性的团状的活性物质混合物，再将团状的活性物质混合物送入膜片制备装置挤压成型为活性物质膜片，复合装置将该活性物质膜片与基材复合，制得极片。整体极片制造设备整合性强，且有效提高极片的生产质量和生产效率，从而有效提高电池的生产质量。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据附图获得其他的附图。
图1为本申请一些实施例提供的膜片制备装置的结构主视图；
图2为本申请一些实施例提供的单螺杆机的螺杆结构主视图；
图3为本申请一些实施例提供的挤出模头的主视图；
图4为本申请一些实施例提供的膜片制备装置的结构俯视图；
图5为本申请一些实施例提供的锥双强制喂料机的锥形螺杆的主视图；
图6为本申请一些实施例提供的极片制造设备的整体结构示意图；
图7为本申请一些实施例提供的极片制造设备的简易结构示意图。
在附图中，附图并未按照实际的比例绘制。
标记说明：1000-极片制造设备；100-膜片制备装置；10-单螺杆机；11-螺杆；111-输送段；112-压缩段；113-均化段；20-挤出模头；21-模头本体；22-进料口；23-唇口；30-锥双强制喂料机；31-锥形螺杆；200-复合装置；210-放卷机构；220-辊压机构；221-压辊；300-捏合装置；400-烘干装置；500-活性物质膜片；600-基材。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。通常在此处附图中描述和示出的本申请实施例的组件可以以各种不同的配置来布置和设计。
因此，以下对在附图中提供的本申请的实施例的详细描述并非旨在限制要求保护的本申请的范围，而是仅仅表示本申请的选定实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
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。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本文中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。
在本申请实施例的描述中，技术术语“第一”“第二”等仅用于区别不同对象，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、特定顺序或主次关系。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。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
在本申请实施例的描述中，术语“多个”指的是两个以上(包括两个)。
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。
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“设置”“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；可以是机械连接，也可以是电连接、信号连接；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。
在本申请的实施例中，相同的附图标记表示相同的部件，并且为了简洁，在不同实施例中，省略对相同部件的详细说明。应理解，附图示出的本申请实施例中的各种部件的厚度、长宽等尺寸，以及集成装置的整体厚度、长宽等尺寸仅为示例性说明，而不应对本申请构成任何限定。
本申请中所提到的极片是电池单体的重要组成构件，电池单体包括电极组件，电极组件由正极极片、负极极片和隔离膜组成。电池单体主要依靠金属离子在正极极片和负极极片之间移动来工作。极片包括集流体(也就是如下所述的基材)和活性物质层，具体而言，正极极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面，未涂敷正极活性物质层的正极集流体凸出于已涂覆正极活性物质层的正极集流体，未涂敷正极活性物质层的正极集流体可以作为正极极耳。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负极极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面，未涂敷负极活性物质层的负极集流体凸出于已涂覆负极活性物质层的负极集流体，未涂敷负极活性物质层的负极集流体可以作为负极极耳。负极集流体的材料可以为铜，负极活性物质可以为碳或硅等。为了保证通过大电流而不发生熔断，正极极耳的数量为多个且层叠在一起，负极极耳的数量为多个且层叠在一起。
本申请提到的膜片是指活性物质混合物挤压整形后形成的带状的活性物质层膜片，将该活性物质层膜片附着在集流体上可形成极片。
本申请中，制备的极片适用的电池单体可以包括锂离子二次电池、锂离子一次电池、锂硫电池、钠锂离子电池、钠离子电池或镁离子电池等，本申请实施例对此并 不限定。
电池生产技术的发展要从多方面进步，比如能量密度、生产效率、生产质量等等。
传统的极片制备采用湿法涂布工艺，主要是将粘结剂、活性物质、导电剂制成浆料，再将浆料湿法涂覆于集流体表面，集流体再进高温烘箱将溶剂蒸干得到所需要的极片。采用湿法涂布的工艺制备极片存在较多缺点：(1)浆料固含量低，溶剂使用量大，存在烘干能耗大、设备投资大的缺点，且溶剂存在毒性环境不友好的缺点；(2)极片在烘干过程中还存在粘结剂上浮，导致活性物质层各成分分布不均问题，严重制约电池性能；(3)，由于容易出现开裂等问题，无法满足活性物质层较厚的极片的制备需求，电池的能量密度的提升空间小。
为了规避湿法涂布工艺制备极片的缺陷，现有的一些技术的电池采用干法工艺制备极片，干法工艺主要是将电极活性物质、导电剂、干法粘结剂混合均匀后，无需添加大量溶剂，依靠干法粘结剂纤维化形成网状结构而将电极活性物质以及导电剂捆扎固定在粘结剂纤维网格内，制备成自支撑结构的极片膜，然后将极片膜与集流体复合制备成电池极片。相较于传统的湿法涂布制备极片的方式，该工艺在理论程度上可有效降低干燥能耗及周期、减小环境污染，且容易实现厚极片制造，降低极片开裂风险；同时，可避免粘结剂上浮，提高活性物质层的组分分布的均匀性；整体而言，可有效提高极片的生产效率、生产质量，且有利于提高电池的能量密度。
然而，发明人发现：采用干法工艺制备的活性物质层膜片仍然存在膜片挤出均匀性差、连续性差易断裂的问题。
本申请发明人分析其原因发现：活性物质、导电剂、溶剂和粘结剂混合后得到的活性物质混合物的结构相对松散，在将活性物质混合物挤出成型为膜片的过程中，容易因挤出动力的连续均衡性不足、挤出物料的流量均一性差等原因，造成挤出膜片的结构均匀性差、容易断裂等问题，严重制约极片的生产质量。
基于以上原因，为了解决挤出膜片的结构均匀性差、容易断裂等问题，本申请发明人经过深入研究，提供了一种膜片制备装置，该膜片制备装置包括单螺杆机和连接在单螺杆机的出料端的挤出模头，单螺杆机用于输送挤压活性物质混合物，向挤出模头连续性、匀量性输送活性物质混合物，同时为活性物质混合物提供连续、均衡的挤出动力，挤出模头对活性物质混合物进行整形挤压，以挤出结构分布均匀的连续性强的活性物质膜片。
其中，单螺杆机内的螺杆的压缩段对活性物质混合物起到强有效的建压作用，使得活性物质混合物能够更加密实、界面融合性更好，从而有效提高活性物质混合物的弹性、延伸性和可塑性，有效降低挤出膜片的结构分布不均匀、连续性差易断裂的风险。
并且，基于活性物质混合物性质较硬、结构易松散的特性，如果压缩段的长度过短，则无法对活性物质混合物起到充分的建压作用，从而无法有效提高活性物质混合物的密实性和结构可塑性，如果压缩段的长度过长，则会导致螺杆均化段长度过短，从而无法保证对挤出模头的输料量的均匀性，进而影响挤出膜片的结构均匀性。本申 请技术方案将螺杆的压缩段的长度设计为螺杆总体长度的45％至65％，可有效保证活性物质混合物的结构致密性，同时，有效保证单螺杆机向挤出模头供料量的连续均匀性，从而有效保证挤出膜片的结构均匀性和结构连续性，使得电池的生产质量得以有效提高。
本申请实施例公开的膜片制备装置100可以但不限用于极片制备，还可以用于各种塑胶膜片制备或其他领域的挤出带状材料的制备工艺。
请参照图1至图3，图1为本申请一些实施例提供的膜片制备装置100的结构主视图；图2为本申请一些实施例提供的单螺杆机10的螺杆11结构主视图；图3为本申请一些实施例提供的挤出模头20的主视图。本申请一些实施例提供的膜片制备装置100包括单螺杆机10和挤出模头20，单螺杆机10用于输送挤压活性物质混合物，挤出模头20连接于单螺杆机10的出料端，用于挤出活性物质膜片500；其中，单螺杆机10的螺杆11包括压缩段112，压缩段112的轴向长度为L1，螺杆11的轴向长度为L，0.45≤L1/L≤0.65。
单螺杆机10又称单螺杆挤出机，单螺杆挤出机主要包括挤压系统和传动系统。挤压系统主要包括螺杆11和料筒，物料通过螺杆11的转动在料筒内移动。传动系统的作用主要是驱动螺杆11旋转，供给螺杆11在挤出过程中所需要的扭矩和转矩，传动系统通常由电动机、减速器和轴承等组成。
常规的单螺杆机10的螺杆11可以为基本的螺旋机构，螺杆11可以包括沿螺杆11的输送方向依次设置的输送段111(也称加料段)、压缩段112和均化段113(也称计量段)。其中，压缩段112的作用为压实活性物质混合物，建立挤出压力。
由于单螺杆机10为成熟技术，本实施例不再对单螺杆机10的各个详细结构组成进行赘述。
如前所述，活性物质混合物用于形成极片的活性物质层，活性物质混合物可以为包括电极活性物质、导电剂、溶剂、粘结剂等在内的混合物。可以理解的是，活性物质混合物可以为团状的、絮状的具备一定黏性、可塑性的、延展性的结构。
挤出模头20用于对活性物质混合物的挤出形状进行整形，使得活性物质混合物挤出成型为立体结构的带状的膜片结构。
本实施例对于挤出模头20结构类型不做特别限定，挤出模头20可以采用常规的柱塞式结构、衣架式结构、鱼尾式结构，只要满足物料均匀挤出以达到膜片的尺寸需求即可。示例性的，如图3所示，挤出模头20可以包括安装在单螺杆机10的出料端的模头本体21，模头本体21设有进料口22和与进料口22连通的唇口23，进料口22与单螺杆11挤出机的出料端连通，唇口23的横截面形状与挤出膜片的横截面形状相对应，活性物质混合物经进料口22进入模头本体21，并经唇口23挤出为膜片即可。唇口23的厚度(对应活性物质膜片的厚度)可以选择为1mm～10mm、2mm～10mm、3mm～8mm、4mm～9mm、4mm～7mm、4mm～6mm等等，示例性，唇口23的厚度可以为5mm。
如图2所示，螺杆11的轴向沿第一方向X延伸，压缩段112的沿第一方向X的长度为L1，螺杆11的沿第一方向X的总长为L，L1与L的比值满足0.45≤L1/L≤ 0.65。
也就是说，L1/L可以是大于等于0.45并小于0.65的任意数值，比如，L1/L可以是0.45、0.48、0.55、0.58、0.65等。在一些实施例中，L1与L的比值满足0.5≤L1/L≤0.6。
膜片制备装置100通过单螺杆机10向挤出模头20连续性送料，为活性物质混合物提供挤出动力，挤出模头20对活性物质混合物整形，使得活性物质混合物得以挤出成型为立体状的活性物质膜片500。其中，单螺杆机10内的螺杆11的压缩段112对活性物质混合物起到建压作用，使得活性物质混合物的更加密实、界面融合性更好，有效提高活性物质混合物的弹性、延伸性和可塑性，从而降低挤出膜片的物料分布不均匀、结构强度差易断裂的风险。
另外，活性物质混合物性质较硬、结构易松散，螺杆11对活性物质混合物的建压尤为重要，当压缩段112的长度过短(L1/L小于0.45)，则无法对活性物质混合物起到充分的建压作用，从而无法有效提高活性物质混合物的密实性和结构可塑性，如果压缩段112的长度过长(L1/L大于0.65)，则会导致螺杆11的出料段的长度过短，从而无法保证对挤出模头20的输料量的均匀性，进而影响挤出膜片的结构均匀性。本申请技术方案将螺杆11的压缩段112的长度设计为螺杆11总体长度的45％至65％，可有效保证活性物质混合物的结构致密性，同时，有效保证单螺杆机10向挤出模头20供料量的连续均匀性，从而有效保证挤出膜片的结构均匀性和结构连续性，使得电池的生产质量得以有效提高。
根据本申请的一些实施例，0.54≤L1/L≤0.58。
具体而言，如图2所示，压缩段112的沿第一方向X的长度为L1与螺杆11的沿第一方向X的总长为L的比值L1/L可以是大于等于0.54并小于0.58的任意数值，比如，L1/L可以是0.54、0.55、0.56、0.57、0.58等。优选地，L1/L等于0.55。
螺杆11的压缩段112的长度设计为螺杆11总体长度的54％至58％，可进一步在提高活性物质混合物的结构致密性的同时，有效保证单螺杆机10向挤出模头20供料量的连续均匀性。
根据本申请的一些实施例，螺杆11的压缩比为ε，2≤ε≤2.1，优选地，2.05≤ε≤2.08。
如前所述，螺杆11可以包括沿其输送方向依次设置的输送段111、压缩段112和均化段113，螺杆11的压缩比是螺杆11的输送段111的第一个螺纹槽的容积和螺杆11的均化段113的最后一个螺纹槽的容积的比值，在螺杆11的输送段111、压缩段112和均化段113的螺距相同的条件下，螺杆11的压缩比的计算公式为：
Figure PCTCN2022106724-appb-000001
其中，如图2所示，D为螺杆11的外径，H1为输送段111的第一个螺纹槽的螺纹槽深度(如果输送段111的螺纹槽深度为定值，则H1即为输送段111的螺纹槽深度)，H3为均化段113的最后一个螺纹槽的螺纹槽深度(如果均化段113的螺纹槽深度为定值，则H3即为均化段113的螺纹槽深度)。
本实施例中，螺杆11的压缩比ε可以是大于等于2且小于等于2.1的任意数值，比如，螺杆11的压缩比ε可以是2、2.01、2.02、2.03、2.04、2.05、2.06、2.07、2.08、2.09、2.0、2.1等。
优选地，螺杆11的压缩比ε可以是大于等于2.05且小于等于2.08的任意数值，比如，螺杆11的压缩比为ε可以是2.05、2.055、2.06等。示例性的，螺杆11的压缩比ε为2.07。
螺杆11的压缩比与螺杆11的压缩段112的螺纹槽深度的变化相关，螺杆11的压缩比越大，对活性物质混合物的建压越充分，活性物质混合物的结构致密性和成分均一性更强，可有效降低挤出膜片的结构不均匀、结构强度低易断裂的风险；然而，螺杆11的压缩比过大会使螺杆11强度降低，容易导致螺杆11在较大扭力下剪断，所以会限制螺杆11转速和处理量，本申请的螺杆11的压缩比设计在2至2.1之间，可有效提高单螺杆机10对活性物质混合物的建压作用，同时，有效保证单螺杆机10的处理量和挤出量。
根据本申请的一些实施例，450mm≤L1≤500mm。
如图2所示，压缩段的沿第一方向X的长度L1可以是大于等于450mm，小于等于500mm的任意数值，比如，L1可以为450mm，455mm，460mm，470mm，480mm，490mm，500mm等等，示例性的，L1为550mm。
压缩段112的长度为450mm至500mm，可充分发挥对活性物质混合物的建压作用，保证活性物质混合物的结构致密性和成分均一性，同时，避免螺杆11过长而影响自身结构强度并造成自身重量过大的问题，从而有效降低单螺杆机10制造和安装困难的风险。
根据本申请的一些实施例，如图2所示，螺杆11还包括输送段111和均化段113，输送段111、压缩段112和均化段113沿螺杆11的输送方向依次排列，输送段111的螺纹槽深度大于均化段113的螺纹槽深度，压缩段112的螺纹槽深度由输送段111向均化段113逐渐减小。
输送段111用于将活性物质混合物从单螺杆机10的进料端向压缩段112输送，均化段113将压实的活性物质混合物匀速匀量的向挤出模头20输送。
输送段111的螺纹槽深度大于均化段113的螺纹槽深度，有效保证输送段111的物料处理量和处理效率；压缩段112的螺纹槽深度逐渐减小，其螺纹槽容积逐渐变小，对活性物质混合物的处理量逐渐减小，使得活性物质混合物能够逐步建压，增加活性物质混合物的结构致密性；均化段113的螺纹槽深度最小，以将压实的活性物质混合物匀速匀量的向挤出模头20输送。
根据本申请的一些实施例，压缩段112的螺纹槽深度为H2，3mm≤H2≤10mm，优选地，4mm≤H2≤9.8mm。
如前所述，压缩段112的螺纹槽深度由输送段111向均化段113逐渐减小，则压缩段112的螺纹槽深度H2为变值。3mm≤H2≤10mm，是指H2可以由大于等于3mm且小于等于10mm的任意数值逐渐减小至大于等于3mm的任意数值，优选地，H2可以由H2可以由大于等于4mm且小于等于9.8mm的任意数值逐渐减小至大于等 于4mm的任意数值.示例性的，H2的最大值可以为9.6mm，H2的最小值可以为4mm，即H2由9.6mm逐渐减小至4mm。
压缩段的螺纹槽深度在大于等于3mm并小于等于10mm的区间内沿螺杆11的输送方向逐渐减小，这样的设计，在保证螺杆11压缩比的同时，避免输送段111螺纹槽深度过大而影响螺杆11结构强度，并避免均化段113螺纹槽深度太浅而影响活性物质混合物的输料效率。
根据本申请的一些实施例，输送段111的轴向长度为L2，0.12≤L2/L≤0.4，优选地，0.15≤L2/L≤0.35。
如图2所示，螺杆11的轴向沿第一方向X延伸，输送段111的沿第一方向X的长度为L2，L为螺杆11的沿第一方向的总长，L2/L的比值可以为大于等于0.12且小于等于0.4的任意数值。比如，L2/L可以为0.12、0.13、0.14、0.2、0.3、0.4等。
优选地，L2/L的比值可以为大于等于0.15且小于等于0.35的任意数值。比如，L2/L可以为0.15、0.16、0.17、0.2、0.23、0.25、0.35等。
示例性的，L2/L的比值为0.25。
上述技术方案中，输送段111的长度占螺杆11总长度的12％至40％，可有效保证输送段111对活性物质混合物的输送量和输送效率。
根据本申请的一些实施例，输送段111的轴向长度为L2，200mm≤L2≤240mm，优选地，215mm≤L2≤222mm。
输送段的沿第一方向X的长度L2可以是大于等于200mm，小于等于240mm的任意数值，比如，L2可以为200mm，230mm，240mm等。
优选地，输送段111的沿第一方向X的长度L2可以是大于等于215mm，小于等于222mm的任意数值，比如，L2可以为215mm，216mm，217mm,220mm，222mm等。
示例性的，L2为220mm。
上述技术方案中，输送段111的轴向长度为200mm至240mm，可满足对活性物质混合物的输送效率需求，降低活性物质混合物在单螺杆机10进料端堆积、堵料的风险。
根据本申请的一些实施例，输送段111的螺纹槽深度为H1，螺杆11的外径为D，满足：H1＞0.1D，优选地，H1＞0.2D。
如图2所示，输送段111的螺纹槽深度H1为定值，螺杆11的外径D也为定值，H1可以等于0.11D，0.12D，0.2D，0.3D等大于0.1D的数值，优选地，H1可以等于0.21D、0.22D，0.23D等大于0.2D的数值。示例性的，H1＝0.21D。
上述技术方案中，输送段111的螺纹槽的深度大于螺杆11外径的10％，以有效保证输送段111的螺纹槽的容积，从而有效保证输送段111对活性物质混合物的输送效率。
根据本申请的一些实施例，输送段111的螺纹槽深度为H1，9mm≤H1≤10mm，优选地，9.5mm≤H1≤9.8mm。
输送段的螺纹槽深度为H1为定值，H1可以是大于等于9mm且小于等于 10mm的任意数值，比如，H1可以为9mm，9.1mm，9.2mm，9.3mm，9.4mm，9.5mm，9.8mm，10mm等。
优选地，H1可以是大于等于9.5mm且小于等于9.8mm的任意数值，比如，H1可以为9.5mm，9.6mm，9.7mm，9.75mm，9.8mm等。
示例性的，H1为9.6mm。
上述技术方案中，输送段111的螺纹槽深度为9mm至10mm，可有效保证输送段111的输送效率。
根据本申请的一些实施例，均化段113的轴向长度为L3，0.10≤L3/L≤0.30，优选地，0.15≤L3/L≤0.25。
如图2所示，螺杆11的轴向沿第一方向X延伸，均化段113的沿第一方向X的长度为L3，L为螺杆11的沿第一方向的总长，L3/L的比值可以为大于等于0.10且小于等于0.30的任意数值。比如，L3/L可以为0.10、0.12、0.13、0.14、0.2、0.3、等。
优选地，L3/L的比值可以为大于等于0.15且小于等于0.25的任意数值。比如，L3/L可以为0.15、0.16、0.17、0.18、0.2、0.23、0.25等。
示例性的，L3/L的比值为0.20。
上述技术方案中，均化段113的轴向长度占螺杆11长度的10％至30％，可有效保证均化段113对压实后的活性物质混合物的输料量的均匀性和连续性。
根据本申请的一些实施例，均化段113的轴向长度为L3，150mm≤L3≤200mm，优选地，175mm≤L3≤185mm。
均化段的沿第一方向X的长度L3可以是大于等于150mm，小于等于200mm的任意数值，比如，L3可以为150mm，160mm，170mm，200mm等。
优选地，均化段113的沿第一方向X的长度L3可以是大于等于175mm，小于等于185mm的任意数值，比如，L3可以为175mm，176mm，177mm,180mm，185mm等。
示例性的，L3为180mm。
上述技术方案中，均化段113的轴向长度为150mm至200mm，可满足对活性物质连续、定量、均匀挤出的生产需求，有效保证单螺杆机10的挤出效果。
根据本申请的一些实施例，均化段113的螺纹槽深度为H3，螺杆11的外径为D，0.02D≤H3≤0.15D，优选地，0.08D≤H3≤0.1D。
如图2所示，均化段的螺纹槽深度H3为定值，螺杆11的外径D也为定值，均化段113的螺纹槽深度H3可以为大于等于0.02D且小于等于0.15D的任意数值，比如，H3可以等于0.02D，0.03D，0.04D，0.05D，0.08D，0.09D，0.1D,0.15D等。
优选地，H3可以为大于等于0.08D且小于等于0.1D的任意数值，比如，H3可以等于0.08D，0.085D，0.09D，0.95D等。
示例性的，H3为0.09D。
上述技术方案中，均化段113的螺纹槽的深度占螺杆11外径的2％至15％，可在有效保证均化段113的传送效率的同时，避免均化段113的螺纹槽容积过大而过 多改变活性物质混合物的致密性，避免影响膜片挤出的均匀性和连续性。
根据本申请的一些实施例，均化段113的螺纹槽深度为H3，3mm≤H3≤5mm，优选地，3.8mm≤H3≤4.2mm。
均化段的螺纹槽深度H3为定值，H3可以是大于等于3mm且小于等于5mm的任意数值，比如，H3可以为3mm，3.1mm，3.2mm，3.5mm，4mm，4.5mm，5mm等。
优选地，H3可以是大于等于3.8mm且小于等于4.2mm的任意数值，比如，H3可以为3.8mm，3.9mm，4mm，4.1mm，4.15mm,4.2mm等。
示例性的，H3为4mm。
上述技术方案中，均化段113的螺纹槽深度为3mm至5mm，可有效保证均化段113对活性物质混合物的输料效果。
根据本申请的一些实施例，螺杆11的外径为D，满足：15≤L/D≤40，优选地，18≤L/D≤25。
如图2所示，L为螺杆的轴向长度，L/D即为螺杆11的长径比，螺杆11的长径比L/D可以为大于等于15且小于等于40的任意数值，比如L/D可以为15,16,18,20,21,25,30,35,40等。
优选地，螺杆11的长径比L/D可以为大于等于18且小于等于25的任意数值，比如L/D可以为18,19,20.5,22,23,24,25等。
示例性的，螺杆11的长径比L/D为20。
上述技术方案中，螺杆11的长径比为15至40，如果螺杆11的长径比小于15，会影响单螺杆机10的挤出能力和建压能力，从而影响活性物质混合物挤出成型为膜片的质量，而如果螺杆11的长径比大于40，则会影响螺杆11的结构强度，限制螺杆11转速和处理量，并会因螺杆11过长而增加制造、安装难度；螺杆11的长径比设置在15至40之间，可在有效保证活性物质混合物挤出成型为膜片的生产质量的同时降低单螺杆机10的制造、安装、驱动难度，且有效节省物料成本。
根据本申请的一些实施例，螺杆11的外径为D，40mm≤D≤48mm，优选地，44mm≤D≤46mm。
螺杆11的外径D为定值，D可以是大于等于40mm且小于等于48mm的任意数值，比如，D可以为40mm，41mm，42mm,43mm，47mm，48mm等。
优选地，D可以是大于等于44mm且小于等于46mm的任意数值，比如，D可以为44mm，45mm，45.5mm,46mm等。
示例性的，D为45mm。
上述技术方案中，螺杆11的外径设置为40mm至48mm，可在满足活性物质混合物挤出成型为膜片的生产质量的同时降低单螺杆机10的物料成本。
请继续参照图1-3，并进一步参照图4和图5，图4为本申请一些实施例提供的膜片制备装置100的结构俯视图；图5为本申请一些实施例提供的锥双强制喂料机30的锥形螺杆31的主视图；根据本申请的一些实施例，膜片制备装置100还包括：锥双强制喂料机30，与单螺杆机10的进料端连通，用于向单螺杆机10供料，锥双强 制喂料机30的锥形螺杆31的锥度为C，10°≤C≤30°，优选地，10°≤C≤20°。
锥双强制喂料机是一种常规的强制性加料装置，本申请实施例不对锥双强制喂料机30的工作原理和基础结构进行赘述。锥双强制喂料机30包括两个并列设置的锥形螺杆31，通过两个锥形螺杆31的旋转对物料进行输送。
锥双强制喂料机30与单螺杆机10的进料端连通，是指锥双强制喂料机30的出料端与单螺杆机10的进料端连通，通过锥双强制喂料机30向单螺杆机10内匀量、强制加入活性物质混合物。
锥形螺杆11的锥度C可以为大于等于10°且小于等于30°的任意数值，比如，C可以为10°，12°，13°，15°，20°，25°，30°等。
优选地，锥形螺杆31的锥度C可以为大于等于10°且小于等于20°的任意数值，比如，C可以为10°，11°，12°，13°，14°，15°，16°17°，18°，19°，20°等。
示例性的，锥形螺杆31的锥度C为15°。
上述技术方案中，在单螺杆机10的进料端连接锥双强制喂料机30，锥双强制喂料机30能够将团状的筋网结构的活性物质混合物均量的、连续的、强制的送入单螺杆机10，从而有效保证单螺杆机10对活性物质混合物输送的连续性。如果锥形螺杆31的锥度过小，则锥形螺杆31的喂料速度过慢且无法实现团状料的强制喂料，从而无法保证活性物质混合物的均量、连续喂料；而如果锥形螺杆31的锥度过大，则锥形螺杆31的螺纹槽深度大，其吃料量过大，易导致大部分物料在锥双强制喂料机30内反复循环剪切，不仅容易导致物料剪切过度，且会导致大部分物料无法有效传送至单螺杆11中而被及时带走，影响单螺杆输料的连续性。此外，如果锥度过大也容易导致物料在锥双强制喂料机构中架桥无法进入锥形螺杆31的螺槽中，因此无法实现强制喂料功能。本申请的锥双强制喂料机30的锥形螺杆31的锥度设置在105°至30°之间，可有效保证其对活性物质混合物的喂料均量性及连续性，且降低物料过剪切风险，进而提高膜片挤出的生产质量。
根据本申请的一些实施例，请参照图2和图5，螺杆11还包括输送段111，输送段111位于压缩段112的上游，锥形螺杆31的末端与输送段111对接，锥形螺杆31的末端的螺纹槽深度为H4，输送段111的螺纹槽深度为H1，H4＞H1。
如前所述，输送段111用于将活性物质混合物从单螺杆机10的进料端向压缩段112输送，输送段111设置于单螺杆机10的进料端且位于压缩段112的上游。
上述技术方案中，锥形螺杆31的末端与单螺杆机10的输送段111对接，以将活性物质混合物强制导入单螺杆机10的输送段111，锥形螺杆31的末端的螺纹槽深度大于输送段111的螺纹槽深度，保证锥双强制喂料机30的挤出量大于单螺杆机10的吃料量，以保证螺杆11吃料充足，没有孔隙，进一步提高活性物质混合物的供料的连续均匀性。
根据本申请的一些实施例，0.75H4≤H1≤0.9H4，优选地，0.77H4≤H1≤0.8H4。
输送段的螺纹槽深度为H1为定值，H1可以是大于等于0.75H4并小于等于 0.9H4的任意数值，也就是说H1/H4的比值可以是大于等于0.75并小于等于0.9的任意数值，比如，H1/H4可以为0.75,0.8,0.85,0.9等。
优选地，H1可以是大于等于0.77H4并小于等于0.8H4的任意数值，也就是说H1/H4的比值可以是大于等于0.77并小于等于0.8的任意数值，比如，H1/H4可以为0.77,0.78,0.79,0.8等。
示例性的，H1＝0.78H4。
如果输送段111的螺纹槽深度与锥形螺杆31的末端的螺纹槽深度差值过大，同样会导致大部分物料无法被单螺杆机10及时带走，物料容易在单螺杆机10的进料端堵料，且物料在锥双强制喂料机30内反复循环剪切，容易导致物料剪切过度而破坏物料本身强度、延伸率，无法满足后面工序对于物料的强度和延伸率的要求。输送段111的螺纹槽深度为锥形螺杆31的末端的螺纹槽深度的75％至90％，可有效降低堵料风险和物料过剪切风险，从而保证输料的连续性和活性物质混合物的结构稳定性，进而提高膜片挤出的生产质量。
请继续参照图1-5，并进一步参照图6和图7，图6为本申请一些实施例提供的极片制造设备1000的整体结构示意图；图7为本申请一些实施例提供的极片制造设备1000的简易结构示意图。本申请一些实施例提供了一种极片制造设备1000，极片制造设备1000包括：捏合装置300，用于搅拌捏合活性物质混合物；如上述任一方案所述的膜片制备装置100，设置于捏合装置300的下游，膜片制备装置100用于将活性物质混合物挤出成型为活性物质膜片500；复合装置200，设置于膜片制备装置100的下游，复合装置200用于复合基材600与活性物质膜片500，以形成极片。
捏合装置300可以有多种实施结构，在一些实施例中，捏合装置300可以采用捏合机，捏合机是一种特殊的混合搅拌设备，最常用的结构是两个搅拌桨采用并排相切差速型排列，一个搅拌桨的速度快，一个搅拌桨的速度慢，以便于产生剪切力，不同的桨速使得混炼的活性物质混合物能够迅速剪切，从而使物料能够混合均匀并形成团状或絮状的筋网结构。
在另一些实施例中，捏合装置300也可以采用密炼机。
捏合机和密炼机均为工业生产领域常规的生产设备，在此不对其结构和原理进行赘述。示例性的，捏合装置300为捏合机。
膜片制备装置100设置于捏合装置300的下游，在捏合装置300内捏合形成的活性物质混合物由捏合装置300排出后送入膜片制备装置100，由膜片制备装置100将活性物质混合物挤出成型为膜片。
复合装置200设置在膜片制备装置100的下游，将基材600和膜片制备装置100制得的膜片复合即可形成极片。
复合装置200的实施形式有多种，示例性的，复合装置200可以包括辊压机构220和放卷机构210，辊压机构220可以包括至少一对压辊221，该对压辊221之间形成复合间隙。放卷机构210可以设置在辊压机构220的下方，负责对基材600进行放卷。基材600和膜片进入复合间隙，压辊221对基材600和膜片进行辊压复合即可。
在其他一些实施例中，极片制造设备1000还包括烘干装置400，烘干装置 400设置在复合装置200的下游，负责对极片进行烘干。
极片制造设备的捏合装置300用于预先将制造膜片的各组成物充分混合、捏合为具有一定黏性和可塑性的团状的活性物质混合物，再将团状的活性物质混合物送入膜片制备装置100挤压成型为活性物质膜片500，复合装置200将该活性物质膜片500与基材600复合，制得极片。整体极片制造设备1000整合性强，且有效提高极片的生产质量和生产效率，从而有效提高电池的生产质量。
请参照图1至图5，本申请一些实施例提供的膜片制备装置100包括单螺杆机10、挤出模头20和锥双强制喂料机30，单螺杆机10用于输送挤压活性物质混合物，挤出模头20连接于单螺杆机10的出料端，用于挤出活性物质膜片500，锥双强制喂料机30与单螺杆机10的进料端连通，用于向单螺杆机10供料。
其中，单螺杆机10的螺杆11包括输送段111、压缩段112和均化段113，输送段111、压缩段112和均化段113沿螺杆11的输送方向依次排列，输送段111的螺纹槽深度大于均化段113的螺纹槽深度，压缩段112的螺纹槽深度由输送段111向均化段113逐渐减小。
锥双强制喂料机30的锥形螺杆31的末端与单螺杆机10的输送段111对接。
螺杆11的轴向长度为L，螺杆11的外径为D；输送段111的轴向长度为L1，输送段111的螺纹槽深度为H1；压缩段112的轴向长度为L2，压缩段112的螺纹槽深度为H2；均化段113的轴向长度为L3，均化段113的螺纹槽深度为H3；螺杆11的压缩比为ε；锥双强制喂料机30的锥形螺杆31的锥度为C，锥双强制喂料机30的锥形螺杆31的末端螺纹槽深度为H4；
满足：L1/L＝0.25，L2/L＝0.55，L3/L＝0.2；H1＝0.21D，H3＝0.09D；L/D＝20；ε＝2.07；C＝15°；H1＝0.78H4。
需要说明的是，在不冲突的情况下，本申请中的实施例中的特征可以相互结合。
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 (20)

  1. 一种膜片制备装置，包括单螺杆机和挤出模头，所述单螺杆机用于输送挤压活性物质混合物，所述挤出模头连接于所述单螺杆机的出料端，用于挤出活性物质膜片；
    其中，所述单螺杆机的螺杆包括压缩段，所述压缩段的轴向长度为L1，所述螺杆的轴向长度为L，0.45≤L1/L≤0.65。
  2. 根据权利要求1所述的膜片制备装置，其中，0.54≤L1/L≤0.58。
  3. 根据权利要求1或2所述的膜片制备装置，其中，所述螺杆的压缩比为ε，2≤ε≤2.1，优选地，2.05≤ε≤2.08。
  4. 根据权利要求1-3中任一项所述的膜片制备装置，其中，450mm≤L1≤500mm。
  5. 根据权利要求1-4任一项所述的膜片制备装置，其中，所述螺杆还包括输送段和均化段，所述输送段、所述压缩段和所述均化段沿所述螺杆的输送方向依次排列，所述输送段的螺纹槽深度大于所述均化段的螺纹槽深度，所述压缩段的螺纹槽深度由所述输送段向所述均化段逐渐减小。
  6. 根据权利要求5所述的膜片制备装置，其中，所述压缩段的螺纹槽深度为H2，3mm≤H2≤10mm，优选地，4mm≤H2≤9.8mm。
  7. 根据权利要求5或6所述的膜片制备装置，其中，所述输送段的轴向长度为L2，0.12≤L2/L≤0.4，优选地，0.15≤L2/L≤0.35。
  8. 根据权利要求5-7中任一项所述的膜片制备装置，其中，所述输送段的轴向长度为L2，200mm≤L2≤240mm，优选地，215mm≤L2≤222mm。
  9. 根据权利要求5-8中任一项所述的膜片制备装置，其中，所述输送段的螺纹槽深度为H1，所述螺杆的外径为D，满足：H1＞0.1D，优选地，H1＞0.2D。
  10. 根据权利要求5-9中任一项所述的膜片制备装置，其中，所述输送段的螺纹槽深度为H1，9mm≤H1≤10mm，优选地，9.5mm≤H1≤9.8mm。
  11. 根据权利要求5-10中任一项所述的膜片制备装置，其中，所述均化段的轴向长度为L3，0.10≤L3/L≤0.30，优选地，0.15≤L3/L≤0.25。
  12. 根据权利要求5-11中任一项所述的膜片制备装置，其中，所述均化段的轴向长度为L3，150mm≤L3≤200mm，优选地，175mm≤L3≤185mm。
  13. 根据权利要求5-12中任一项所述的膜片制备装置，其中，所述均化段的螺纹槽深度为H3，所述螺杆的外径为D，0.02D≤H3≤0.15D，优选地，0.08D≤H3≤0.1D。
  14. 根据权利要求5-13中任一项所述的膜片制备装置，其中，所述均化段的螺纹槽深度为H3，3mm≤H3≤5mm，优选地，3.8mm≤H3≤4.2mm。
  15. 根据权利要求1-14中任一项所述的膜片制备装置，其中，所述螺杆的外径为D，满足：15≤L/D≤40，优选地，18≤L/D≤25。
  16. 根据权利要求1-15中任一项所述的膜片制备装置，其中，所述螺杆的外径为D，40mm≤D≤48mm，优选地，44mm≤D≤46mm。
  17. 根据权利要求1-16中任一项所述的膜片制备装置，其中，所述膜片制备装置还包括：
    锥双强制喂料机，与所述单螺杆机的进料端连通，用于向所述单螺杆机供料，所述锥双强制喂料机的锥形螺杆的锥度为C，10°≤C≤30°，优选地，10°≤C≤20°。
  18. 根据权利要求17所述的膜片制备装置，其中，所述螺杆还包括输送段，所述输送段位于所述压缩段的上游，所述锥形螺杆的末端与所述输送段对接，所述锥形螺杆的末端的螺纹槽深度为H4，所述输送段的螺纹槽深度为H1，H4＞H1。
  19. 根据权利要求18所述的膜片制备装置，其中，0.75H1≤H4≤0.9H1，优选地，0.77H4≤H1≤0.8H4。
  20. 一种极片制造设备，包括：
    捏合装置，用于搅拌捏合活性物质混合物；
    如权利要求1-19中任一项所述的膜片制备装置，设置于所述捏合装置的下游，所述膜片制备装置用于将所述活性物质混合物挤出成型为活性物质膜片；
    复合装置，设置于所述膜片制备装置的下游，所述复合装置用于复合基材与所述活性物质膜片，以形成极片。
PCT/CN2022/106724 2022-07-20 2022-07-20 膜片制备装置及极片制造设备 Ceased WO2024016210A1 (zh)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN202280076672.3A CN118235264A (zh) 2022-07-20 2022-07-20 膜片制备装置及极片制造设备
EP22951488.0A EP4517850A4 (en) 2022-07-20 2022-07-20 Apparatus for producing a separator and apparatus for producing an electrode film
PCT/CN2022/106724 WO2024016210A1 (zh) 2022-07-20 2022-07-20 膜片制备装置及极片制造设备
US18/885,084 US20250001666A1 (en) 2022-07-20 2024-09-13 Film Preparation Apparatus and Electrode Plate Manufacturing Device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2022/106724 WO2024016210A1 (zh) 2022-07-20 2022-07-20 膜片制备装置及极片制造设备

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/885,084 Continuation US20250001666A1 (en) 2022-07-20 2024-09-13 Film Preparation Apparatus and Electrode Plate Manufacturing Device

Publications (1)

Publication Number Publication Date
WO2024016210A1 true WO2024016210A1 (zh) 2024-01-25

Family

ID=89616790

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/106724 Ceased WO2024016210A1 (zh) 2022-07-20 2022-07-20 膜片制备装置及极片制造设备

Country Status (4)

Country Link
US (1) US20250001666A1 (zh)
EP (1) EP4517850A4 (zh)
CN (1) CN118235264A (zh)
WO (1) WO2024016210A1 (zh)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995019052A1 (en) * 1994-01-07 1995-07-13 Valence Technology, Inc. Continuous screw mixing and extruding of an electrode paste
JP2010017947A (ja) * 2008-07-11 2010-01-28 Sekisui Chem Co Ltd 熱可塑性樹脂の押出用シングルスクリューとそのスクリューを用いた押出成形方法
CN102066080A (zh) * 2008-06-19 2011-05-18 伊士曼化工公司 采用低熔点聚对苯二甲酸乙二酯树脂具有改进性能的螺杆设计
CN112072063A (zh) * 2020-09-15 2020-12-11 惠州亿纬锂能股份有限公司 一种极片成型的挤出头及包括其的成型装置及其成型方法和制备方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3596320A (en) * 1968-11-15 1971-08-03 Allied Chem Apparatus for melting and dispersion of thermoplastic polymers
EP2647483B1 (en) * 2010-11-30 2017-09-06 Mitsubishi Gas Chemical Company, Inc. Molded article having excellent fuel barrier properties
WO2015037459A1 (ja) * 2013-09-11 2015-03-19 三菱瓦斯化学株式会社 ポリオレフィン系構造体の製造方法
CN104589618B (zh) * 2015-01-12 2017-01-18 安徽普瑞斯电工机械有限公司 电线电缆挤出机专用两段bm式螺杆
CN214188373U (zh) * 2020-11-13 2021-09-14 吉林新基管业科技有限公司 一种螺杆挤出机

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995019052A1 (en) * 1994-01-07 1995-07-13 Valence Technology, Inc. Continuous screw mixing and extruding of an electrode paste
CN102066080A (zh) * 2008-06-19 2011-05-18 伊士曼化工公司 采用低熔点聚对苯二甲酸乙二酯树脂具有改进性能的螺杆设计
JP2010017947A (ja) * 2008-07-11 2010-01-28 Sekisui Chem Co Ltd 熱可塑性樹脂の押出用シングルスクリューとそのスクリューを用いた押出成形方法
CN112072063A (zh) * 2020-09-15 2020-12-11 惠州亿纬锂能股份有限公司 一种极片成型的挤出头及包括其的成型装置及其成型方法和制备方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4517850A4 *

Also Published As

Publication number Publication date
EP4517850A1 (en) 2025-03-05
EP4517850A4 (en) 2025-06-18
US20250001666A1 (en) 2025-01-02
CN118235264A (zh) 2024-06-21

Similar Documents

Publication Publication Date Title
EP3586950B1 (en) Continuous efficient production process for lithium battery slurry
CN216935792U (zh) 一种电池浆料生产系统装置
CN112871051B (zh) 一种双螺杆挤出机及其混合方法
WO2024016209A1 (zh) 膜片制备装置、极片制造设备及膜片制备方法
CN218251223U (zh) 涂布模头以及涂布设备
EP4517850A1 (en) Separator manufacturing apparatus and electrode sheet manufacturing device
CN112072063A (zh) 一种极片成型的挤出头及包括其的成型装置及其成型方法和制备方法
CN108258188A (zh) 一种锂离子电池电极浆料的干混制备方法
CN218299824U (zh) 防涂层掉料的高压实密度的极片结构
CN219066843U (zh) 干法电极膜制备装置、干电极制备系统及电池生产线
US4902532A (en) Method for preparing lead-acid electrochemical cell electrode plates
CN208145793U (zh) 一种锂离子电池浆料连续制浆设备
CN209438423U (zh) 一种高容量锰酸锂正极材料的制备装置
CN222342684U (zh) 一种电池浆料连续化投料混料系统
CN220744499U (zh) 一种用于锂电池隔膜生产线的送料口组件及其喂料系统
CN116510587B (zh) 凹版浆料系统及凹版浆料循环方法
CN223027116U (zh) 电池浆料制备装置
CN223395717U (zh) 一种固液同步进料的计量喂料系统
US20240429362A1 (en) Method for the continuous production of a battery electrode
CN119812178B (zh) 一种负极合浆方法
CN117832381A (zh) 一种基于超声波涂布的干法电极制造方法
CN115275114B (zh) 电池负极片安全层浆料涂布的方法和电池负极片
KR102893458B1 (ko) 고전단 믹싱 장치
CN219149888U (zh) 一种烧结混合机滚筒
CN222727516U (zh) 螺杆挤出机及电池生产系统

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22951488

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 202280076672.3

Country of ref document: CN

WWE Wipo information: entry into national phase

Ref document number: 2022951488

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2022951488

Country of ref document: EP

Effective date: 20241124

NENP Non-entry into the national phase

Ref country code: DE