CN118578728A - Manufacturing system for composite aluminum foil film - Google Patents

Manufacturing system for composite aluminum foil film Download PDF

Info

Publication number
CN118578728A
CN118578728A CN202311770839.9A CN202311770839A CN118578728A CN 118578728 A CN118578728 A CN 118578728A CN 202311770839 A CN202311770839 A CN 202311770839A CN 118578728 A CN118578728 A CN 118578728A
Authority
CN
China
Prior art keywords
aluminum foil
film
metal aluminum
roller
layer
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.)
Pending
Application number
CN202311770839.9A
Other languages
Chinese (zh)
Inventor
吴培服
吴迪
郑卫
周振
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.)
Jiangsu Shuangxing Color Plastic New Materials Co Ltd
Original Assignee
Jiangsu Shuangxing Color Plastic New Materials 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 Jiangsu Shuangxing Color Plastic New Materials Co Ltd filed Critical Jiangsu Shuangxing Color Plastic New Materials Co Ltd
Priority to CN202311770839.9A priority Critical patent/CN118578728A/en
Publication of CN118578728A publication Critical patent/CN118578728A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/085—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/088—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/09—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/04—Punching, slitting or perforating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H01M4/80—Porous plates, e.g. sintered carriers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/04—Punching, slitting or perforating
    • B32B2038/047—Perforating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/05—5 or more layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/202—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/10—Batteries

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Composite Materials (AREA)
  • Laminated Bodies (AREA)

Abstract

本发明公开了一种用于复合铝箔膜的制造系统，至少包括用于输送所述基材层的基材送料辊、用于向所述基材层的两侧输送金属铝箔的一对铝箔送料辊以及用于向金属铝箔的外侧输送碾压保护膜的一对保护膜送料辊，由所述基材层、金属铝箔以及碾压保护膜复合而成的膜层沿其前进方向的两侧设置有至少一对碾压辊，所述碾压辊的下游设置有一对在所述膜层的两侧形成所述孔洞的模具辊，所述模具辊的下游设置有用于所述复合铝箔膜的收料辊。本发明的制造系统可用于连续加工复合铝箔膜，可用于制备一种复合之后再碾压延展的低厚度的复合铝箔膜，避免了低厚度的金属铝箔难以复合的缺陷，既能获得更薄的金属铝箔，又能保证导电性和强度。

The present invention discloses a manufacturing system for composite aluminum foil film, which at least includes a substrate feeding roller for conveying the substrate layer, a pair of aluminum foil feeding rollers for conveying metal aluminum foil to both sides of the substrate layer, and a pair of protective film feeding rollers for conveying a laminated protective film to the outside of the metal aluminum foil. The film layer composed of the substrate layer, the metal aluminum foil and the laminated protective film is provided with at least a pair of laminating rollers on both sides along its forward direction, a pair of mold rollers for forming the holes on both sides of the film layer are provided downstream of the laminating rollers, and a receiving roller for the composite aluminum foil film is provided downstream of the mold rollers. The manufacturing system of the present invention can be used for continuous processing of composite aluminum foil film, and can be used for preparing a low-thickness composite aluminum foil film that is laminated and stretched, avoiding the defect that low-thickness metal aluminum foil is difficult to laminate, and can obtain thinner metal aluminum foil while ensuring conductivity and strength.

Description

Manufacturing system for composite aluminum foil film
Technical Field
The invention relates to the technical field of manufacturing of current collectors in lithium ion batteries, in particular to a manufacturing system of a composite aluminum foil film which can be used as a positive current collector of a lithium ion battery.
Background
The current collector in the lithium ion battery consists of a metal foil film for conducting electricity, and mainly serves to bear electrode materials of the anode and the cathode and collect current and conduction electrons. The common positive current collector is aluminum foil, and the common negative current collector is copper foil. In order to increase the energy density of the battery, composite current collectors using a composite of a plastic film and a metal layer, such as a composite aluminum current collector used as a positive electrode and a composite copper current collector used as a negative electrode, have appeared. The metal layer in the composite current collector is bonded to the plastic film by a metal foil, and is formed on the plastic film by an evaporation or sputtering process. The metal foil has excellent conductivity but a thicker thickness; the metal layer formed by sputtering and vapor plating has thinner thickness, poor conductivity, needs repeated film plating for many times, has high process requirement, is easy to wrinkle by repeated film plating of the plastic film, and has relatively poor yield.
For example, CN 114695900B discloses a composite current collector, including first aluminium foil layer, PET layer and the second aluminium foil layer of range upon range of setting in proper order, first aluminium foil layer and second aluminium foil layer all with PET layer fixed connection, the up end on first aluminium foil layer is provided with a plurality of first recesses, the lower terminal surface on second aluminium foil layer is provided with a plurality of second recesses. This current is in order to obtain the recess, has adopted thicker aluminium foil structure.
Then, the aluminum foil and copper foil used as current collectors are mainly used for conduction and do not participate in the active reaction. One of the means for increasing the energy density of the battery at this stage is to reduce the mass ratio of the current collector: on the one hand, a composite metal foil film with smaller density is adopted, and on the other hand, the thickness of the metal layer is reduced. The use of thicker aluminum foil is not desirable at this stage. However, complex processes and excessive costs also limit the application of the coating process to composite metal foil films.
Disclosure of Invention
The technical problem underlying the present invention is to provide a manufacturing system for a composite aluminium foil film, which reduces or avoids the aforementioned problems.
In order to solve the technical problems, the invention provides a manufacturing system for a composite aluminum foil film, which is used for preparing the composite aluminum foil film formed by a substrate layer and metal aluminum foils adhered to two sides of the substrate layer, wherein a layer of rolling protection film is adhered to the outer side of the metal aluminum foil, and holes corresponding to the positions are uniformly distributed on the metal aluminum foil and the rolling protection film; the manufacturing system at least comprises a substrate feeding roller for conveying the substrate layer, a pair of aluminum foil feeding rollers for conveying metal aluminum foils to two sides of the substrate layer and a pair of protection film feeding rollers for conveying rolling protection films to the outer sides of the metal aluminum foils, wherein at least one pair of rolling rollers are arranged on two sides of a film layer formed by compounding the substrate layer, the metal aluminum foils and the rolling protection films along the advancing direction of the film layer, a pair of die rollers for forming holes on two sides of the film layer are arranged on the downstream of the rolling rollers, and a material collecting roller for compounding the aluminum foil films is arranged on the downstream of the die rollers.
Preferably, a corrosive liquid spraying mechanism for spraying the metal aluminum foil in the holes to the two sides of the film layer, a cleaning mechanism for the sprayed film layer, a drying mechanism for the cleaned film layer and a trimming mechanism before winding are further arranged between the die roller and the material collecting roller.
Preferably, a pair of glue spreading rollers for coating adhesives on two sides of the substrate layer are arranged between the substrate feeding roller and the aluminum foil feeding roller; the metal aluminum foil is extruded and attached to two sides of the glued substrate layer through a pair of bonding rollers; the rolling protective film is attached to the outer side of the metal aluminum foil through a pair of attaching rollers.
Preferably, a pair of oiling rollers for coating lubricating oil on the outer side of the metal aluminum foil is arranged between the bonding roller and the attaching roller.
Preferably, a first heating device for heating the film layer is arranged between the attaching roller and the rolling roller.
Preferably, a second heating device for heating and annealing the film layer is arranged between the grinding roller and the die roller.
Preferably, a plurality of pairs of rolling rollers with sequentially increased lengths are arranged along the advancing direction of the film layer, a set of clamping and stretching mechanisms are respectively arranged along two sides of the film layer, each clamping and stretching mechanism comprises an annular track and a plurality of clamping pincers which circularly move along the annular track, and each clamping pincers clamps the side edge of the film layer and axially clamps and stretches the film layer transversely.
Preferably, a plurality of burs for puncturing the metal aluminum foil and rolling the protective film to form the holes are uniformly arranged on the outer surface of the die roller.
The manufacturing system can be used for continuously processing the composite aluminum foil film, can be used for preparing a composite aluminum foil film with low thickness which is rolled and stretched after being compounded, avoids the defect that the metal aluminum foil with low thickness is difficult to compound, can obtain thinner metal aluminum foil, and can ensure conductivity and strength.
Drawings
The following drawings are only for purposes of illustration and explanation of the present application and are not intended to limit the scope of the application.
Fig. 1 shows a cross-sectional view of a composite aluminum foil film according to an embodiment of the present invention.
Fig. 2 is a schematic flow chart of a manufacturing system of a composite aluminum foil film according to an embodiment of the present invention.
Fig. 3 is a schematic structural view showing a rolling stretching mechanism of a manufacturing system of a composite aluminum foil film according to another embodiment of the present invention.
Fig. 4 is a schematic view showing the structure of a mold roll of a manufacturing system of a composite aluminum foil film according to still another embodiment of the present invention.
Fig. 5 is a schematic cross-sectional view showing a spike on a mold roll of a manufacturing system of a composite aluminum foil film according to still another embodiment of the present invention.
Detailed Description
For a clearer understanding of technical features, objects, and effects of the present application, a specific embodiment of the present application will be described with reference to the accompanying drawings. Wherein like parts are designated by like reference numerals.
The existing lithium battery generally adopts a metal aluminum foil obtained by rolling metal aluminum as a positive current collector, and the thickness of the adopted metal aluminum foil is difficult to reduce due to the strength limitation of the material, otherwise, the metal aluminum foil is easy to tear in the operation process. Even if the metal aluminum foil and the plastic film are compounded together, the compounding operation cannot be performed by using the metal aluminum foil which is too thin.
In view of this, the present invention proposes a composite aluminum foil film composed of a base material layer 1 and metal aluminum foils 2 adhered to both sides of the base material layer 1, as shown in fig. 1. The substrate layer 1 can be made of plastic films made of polyolefin, polyester and other materials. In a preferred embodiment, the substrate layer 1 is preferably made of a polyester film. The metal aluminum foil 2 can be adhered to two sides of the substrate layer 1 through an adhesive (not shown in the figure), and polyurethane adhesives with good high temperature resistance in the prior art can be selected.
Further, the metal aluminum foil 2 in the composite aluminum foil film of the application is composed of metal aluminum foil of a first thickness of 5-15 μm and metal aluminum foil of a second thickness of 3-8 μm laminated and stretched on both sides of the base material layer 1. That is, the metal aluminum foil 2 of the present application initially has a first thickness, and becomes a final second thickness after being roll-stretched by being attached to both sides of the base material layer 1. Because the material strength of the metal aluminum is not good, the metal aluminum foil with the second thickness of 3-8 mu m is directly adopted, the price is high, the bonding and other composite operations are difficult to carry out, therefore, the application adopts the metal aluminum foil with the first thickness of 5-15 mu m as the initial raw material, the metal aluminum foil is bonded and compounded with the base material layer 1, then the rolling and stretching operation is carried out to change the metal aluminum foil into the second thickness, and then the composite operation is not needed, so that the thinner metal aluminum foil can be obtained, and the conductivity and the strength can be ensured.
For example, the metallic aluminum foil 2 used is rolled from metallic aluminum having an aluminum content exceeding 98%, and a commercially available finished metallic aluminum foil product having a thickness of 5 to 15 μm can be selected as the initial raw material of the first thickness.
Further, as shown in the figure, a layer of rolling protection film 3 is further attached to the outer side of the metal aluminum foil 2, so as to protect the surface of the metal aluminum foil 2 from being scratched and broken in the rolling and stretching process. The rolling protective film 3 can be made of plastic films made of polyolefin, polyester, nylon and other materials. In a preferred embodiment, the laminate protective film 3 is preferably made of a nylon film excellent in strength and self-lubricating properties, preferably a nylon film having a thickness of 8 to 10 μm.
Still further, holes 4 corresponding to the positions are uniformly distributed on the metal aluminum foil 2 and the rolling protective film 3. The holes 4 are uniformly distributed on two sides of the composite aluminum foil film and are conical holes with large openings and small tail ends as shown in the figure. In a preferred embodiment, the end of the hole 4 protrudes into about half the thickness of the substrate layer 1, and it is difficult to precisely protrude into half the thickness of the substrate layer 1, however, it is preferable that 1/3 to 1/2 of the thickness of the hole 4 protrudes into the substrate layer 1 is sufficient from the viewpoint of cost.
The holes 4 formed on the metal aluminum foil 2 can be used for increasing the contact area between the metal aluminum foil 2 and the positive electrode material, improving the adhesive force between the positive electrode material and the metal aluminum foil 2, avoiding the separation of the positive electrode material and the metal aluminum foil 2 and increasing the internal resistance. The holes 4 on both sides of the composite aluminum foil film are not in the state of through holes in order to avoid slurry leakage during the subsequent application of the positive electrode material. These holes 4 can then be enlarged by the positive electrode material when the cells are compacted, thereby facilitating an enlarged contact area with the positive electrode material. Under the condition of short circuit and overheat of the battery core, the holes 4 can be blocked by the heated and melted substrate layer 1, so that the current is prevented from becoming larger continuously, and the risk of combustion explosion of the battery is reduced.
After rolling and stretching the metal aluminum foil 2, the rolling protective film 3 still needs to be remained on the surface of the metal aluminum foil 2 for protecting the metal aluminum foil 2 when the holes 4 are formed later, so as to avoid the holes of the metal aluminum foil 2 from forming larger tearing edges, and improve the consistency of the holes 4. After that, the rolling protection film 3 can be kept to protect the metal surface, and the rolling protection film 3 can be removed until needed.
In order to further improve the consistency of the current collector, after the holes 4 are formed, a corrosive liquid may be sprayed or coated on the surface of the rolling protection film 3 to corrode the edges of the metal aluminum foil 2 extruded into the holes 4, so as to remove edge burrs when the holes 4 are formed. And meanwhile, a part of metal aluminum foil is corroded, so that the weight of the composite aluminum foil film can be further reduced, and the energy density of the lithium battery can be improved.
In a preferred embodiment, the holes 4 have a maximum opening diameter of 20-30 μm in the metal foil 2, and the centers of adjacent holes 4 are spaced apart by 50-100 μm.
The system and method for manufacturing the composite aluminum foil film of the present application are described in further detail below with reference to fig. 2. Fig. 2 is a schematic flow chart of a manufacturing system of a composite aluminum foil film according to an embodiment of the application. As shown in the figure, the manufacturing system of the present application is dedicated to manufacturing the composite aluminum foil film shown in fig. 1, that is, the manufacturing system is used for preparing the composite aluminum foil film composed of the base material layer 1 and the metal aluminum foils 2 adhered to both sides of the base material layer 1, a layer of rolling protection film 3 is adhered to the outer side of the metal aluminum foils 2, and holes 4 corresponding to the positions are uniformly distributed on the metal aluminum foils 2 and the rolling protection film 3.
In a specific embodiment, the manufacturing system at least comprises a substrate feeding roller 10 for conveying the substrate layer 1, a pair of aluminum foil feeding rollers 20 for conveying the metal aluminum foil 2 to two sides of the substrate layer 1, and a pair of protection film feeding rollers 30 for conveying the rolled protection film 3 to the outer side of the metal aluminum foil 2, wherein at least one pair of rolling rollers 40 are arranged on two sides of a film layer formed by compounding the substrate layer 1, the metal aluminum foil 2 and the rolled protection film 3 along the advancing direction, a pair of die rollers 50 for forming holes 4 on two sides of the film layer are arranged on the downstream of the rolling rollers 40, and a receiving roller 80 for compounding the aluminum foil film is arranged on the downstream of the die rollers 50.
In operation of the manufacturing system of the present application, a substrate layer 1, for example, a substrate layer 1 made of PET, may be first fed by a substrate feed roll 10, the initial thickness of the substrate layer 1 being 10-20 μm. Then, a layer of metal aluminum foil 2 having a first thickness of 5-15 μm is respectively fed to both sides of the base material layer 1 by aluminum foil feed rolls 20.
In a specific embodiment, a pair of glue rollers 11 for coating the adhesive on both sides of the substrate layer 1 may be further disposed between the substrate feed roller 10 and the aluminum foil feed roller 20; the metal aluminum foil 2 is pressed and attached to both sides of the glued substrate layer 1 by a pair of adhesive rolls 21, so that the metal aluminum foil 2 is adhered to the substrate layer 1.
Thereafter, a laminate protective film 3, for example, a film made of nylon having a thickness of 8-10 μm is fed to the outside of the metal aluminum foil 2 by a protective film feeding roller 30. In the illustrated embodiment, the laminate protective film 3 may be attached to the outside of the metal aluminum foil 2 by a pair of attaching rollers 31.
The plastic film generally has a certain self-adhesive property, so that the rolling protective film 3 can be directly adhered to the surface of the metal aluminum foil 2 without gluing. Of course, in order to avoid slipping, a low-viscosity material may be coated on the surface of the metal aluminum foil 2 to facilitate subsequent removal of the rolling protective film 3. In the illustrated embodiment, the present application provides a pair of oiling rollers 22 for coating the outside of the metal aluminum foil 2 with lubricating oil between the bonding roller 21 and the attaching roller 31, and by coating the lubricating oil such as engine oil or silicone grease, the adhesion force of the rolling protective film 3 to the metal aluminum foil 2 can be increased, and at the same time, the friction force can be reduced during the subsequent rolling extension process, thereby avoiding the film layer from being broken.
Then, the film layer to which the laminate protective film 3 is attached is placed between at least a pair of laminating rollers 40, and the metal aluminum foil 2 is laminated from the first thickness to a second thickness of 3-8 μm by the pressure of the laminating rollers 40. The rolling of the metal aluminum foil 2 from the first thickness to the second thickness is only required to control the gap between the rolling rollers 40, and of course, the gap set between the rolling rollers 40 is slightly smaller than the thickness of the film after the reduction in view of the problem of large elastic deformability of the plastic in the film. In addition, the film layer structure is easily damaged by thinning the film layer in a pure hard extrusion mode, so that the rolling protection film 3 contacted with the rolling roller 40 is made of nylon, the slidability can be improved, the extrusion is avoided, and meanwhile, the friction force between the film layer and the rolling roller 40 during rolling can be further reduced by auxiliary coating of lubricating oil. After the rolling and stretching, the thickness of the base material layer 1 is changed from 10 to 20 μm to about 6 to 12 μm.
Further, it is preferable that the film layer is heated before being rolled by the rolling roller 40 to increase the ductility of the plastic film, improve the rolling thinning efficiency, and reduce the rebound amount of the heated plastic film to be beneficial to maintaining the thickness of the stretched film layer. In the illustrated embodiment, a first heating device 32 for heating the film layer is disposed between the attaching roller 31 and the laminating roller 40. In a preferred embodiment, the first heating means 32 may heat the film layer by infrared heating, preferably at a temperature of 150-170 ℃.
In addition, the two sides of the film layer may be clamped and stretched transversely along the axial direction of the laminating roller 40 while the film layer is laminated by the laminating roller 40. That is, the film layer is longitudinally stretched by the calender roll 40 while being transversely stretched by sandwiching both sides in the width direction with sandwiching means to accelerate the thinning speed of the material. Because the stretching problem of the metal aluminum foil is involved, the whole film layer is required to be clamped during clamping and stretching, the transverse stretching speed is controlled, and the problem of inconsistent stretching proportion between the film layers is avoided.
Fig. 3 shows a schematic structural view of a rolling and stretching mechanism of a manufacturing system of a composite aluminum foil film according to another embodiment of the present application, in the illustrated embodiment, a plurality of pairs of rolling rollers 40 with sequentially increased lengths may be disposed along the advancing direction of the film layer, a set of clamping and stretching mechanisms 42 are disposed along both sides of the film layer, respectively, the clamping and stretching mechanisms 42 include an annular rail 421 and a plurality of clamping jaws 422 that circularly move along the annular rail 421, and the clamping jaws 422 clamp the side of the film layer to transversely clamp and stretch the film layer along the axial direction of the rolling rollers 40. The clamping and stretching mechanism 42 is obliquely arranged along the advancing direction of the film layer, and the film layer is gradually stretched through the clamping and stretching mechanism 42 to two sides while being rolled and stretched step by a plurality of rolling rollers 40 in the advancing process. The clamp 422 may be configured to automatically close to clamp the sides when moved along the circular track 421 to a position where it meets the sides of the film, and automatically open to release the sides when moved along the circular track 421 to a position where it separates from the sides of the film.
Then, the laminated film layer is placed between a pair of mold rolls 50 having the spurs 51, and the corresponding holes 4 are uniformly formed on the metal aluminum foil 2 and the laminated protective film 3 by the spurs 51 on the mold rolls 50, as shown in fig. 4. In the illustrated embodiment, the outer surface of the mold roll 50 is uniformly provided with a plurality of spikes 51 for piercing the metal foil 2 and rolling the protective film 3 to form the holes 4. In another embodiment, the spines 51 are cones, the bottom diameter D of which is 20-30 μm, and the center-to-center distance between adjacent cones is 50-100 μm, as shown in fig. 5. By uniformly providing the spurs 51 on the mold roll 50, the holes 4 having a desired size and position precisely distributed on the film layer can be formed, and uniformity of the film layer structure can be ensured.
In the process of manufacturing the hole 4, if stress exists when the film layer is rolled, the film layer with excessive stress after perforation can generate displacement shrinkage, so that the hole can be closed when the spurs are removed. To avoid this problem, it is preferable to heat anneal the membrane layer before forming the holes 4 to eliminate stresses in the membrane layer as much as possible. In the embodiment shown in fig. 2, a second heating device 41 for thermally annealing the film layer may be further provided between the laminating roller 40 and the mold roller 50. The annealing temperature is preferably 130-150 ℃ and the annealing time is 5-15 minutes.
After annealing to release stress, if there is a small amount of stress concentration, the stress can be released by puncturing the hole 4 to avoid the distortion of the composite aluminum foil film. Although the small amount of stress will deform the holes 4, by setting the appropriate hole size and center-to-center spacing as described above, the holes are prevented from closing completely.
Further, after forming the holes 4, a corrosive liquid may be sprayed or coated on the surface of the rolling protective film 3 to corrode the edges of the metal aluminum foil 2 extruded into the holes 4, so as to remove edge burrs when the holes 4 are formed. Finally, washing with water to remove corrosive liquid, and then drying, trimming and rolling. In the illustrated embodiment, a corrosive liquid spraying mechanism 60 for spraying the metal aluminum foil in the holes 4 to both sides of the film layer, a cleaning mechanism 61 for the sprayed film layer, a drying mechanism 70 for the cleaned film layer, and a trimming mechanism 71 before winding may be further disposed between the mold roll 50 and the collecting roll 80.
Further, in the case where the manufacturing system of the present application is provided with the oiling roller 22, a protective film take-up roller (not shown in the figure) for removing the rolled protective film 3 may be further provided between the corrosive liquid spraying mechanism 60 and the cleaning mechanism 61. That is, after spraying and corrosion, the rolling protective film 3 can be removed, and most of corrosive liquid is taken away at the same time, and lubricating oil coated on the metal aluminum foil 2 is also exposed, and the lubricating oil can be removed at the same time when cleaning. At this time, the cleaning mechanism 61 may have a plurality of groups of cleaning heads, which may be firstly deoiled, then deacidified, and finally rinsed with clean water.
It should be understood by those skilled in the art that while the present application has been described in terms of several embodiments, not every embodiment contains only one independent technical solution. The description is given for clearness of understanding only, and those skilled in the art will understand the description as a whole and will recognize that the technical solutions described in the various embodiments may be combined with one another to understand the scope of the present application.
The foregoing is illustrative of the present application and is not to be construed as limiting the scope of the application. Any equivalent alterations, modifications and combinations thereof will be effected by those skilled in the art without departing from the spirit and principles of this application, and it is intended to be within the scope of the application.

Claims (8)

1.一种用于复合铝箔膜的制造系统，用于制备由基材层(1)和粘附在基材层(1)的两侧的金属铝箔(2)构成的复合铝箔膜，所述金属铝箔(2)的外侧附着有一层碾压保护膜(3)，所述金属铝箔(2)和碾压保护膜(3)上均匀分布有位置对应的孔洞(4)；其特征在于，所述制造系统至少包括用于输送所述基材层(1)的基材送料辊(10)、用于向所述基材层(1)的两侧输送金属铝箔(2)的一对铝箔送料辊(20)以及用于向金属铝箔(2)的外侧输送碾压保护膜(3)的一对保护膜送料辊(30)，由所述基材层(1)、金属铝箔(2)以及碾压保护膜(3)复合而成的膜层沿其前进方向的两侧设置有至少一对碾压辊(40)，所述碾压辊(40)的下游设置有一对在所述膜层的两侧形成所述孔洞(4)的模具辊(50)，所述模具辊(50)的下游设置有用于所述复合铝箔膜的收料辊(80)。1. A manufacturing system for a composite aluminum foil film, for preparing a composite aluminum foil film composed of a substrate layer (1) and a metal aluminum foil (2) adhered to both sides of the substrate layer (1), wherein a layer of a rolled protective film (3) is attached to the outer side of the metal aluminum foil (2), and holes (4) corresponding to positions are evenly distributed on the metal aluminum foil (2) and the rolled protective film (3); characterized in that the manufacturing system at least comprises a substrate feeding roller (10) for conveying the substrate layer (1), a substrate feeding roller (11) for conveying the metal aluminum foil (2) to both sides of the substrate layer (1), and a substrate feeding roller (12) for conveying the metal aluminum foil (2) to both sides of the substrate layer (1). An aluminum foil feed roller (20) and a pair of protective film feed rollers (30) for conveying a laminated protective film (3) to the outside of the metal aluminum foil (2), at least one pair of laminating rollers (40) are arranged on both sides of the film layer formed by the composite of the substrate layer (1), the metal aluminum foil (2) and the laminated protective film (3) along its forward direction, a pair of mold rollers (50) for forming the holes (4) on both sides of the film layer are arranged downstream of the laminating rollers (40), and a receiving roller (80) for the composite aluminum foil film is arranged downstream of the mold rollers (50). 2.如权利要求1所述的制造系统，其特征在于，所述模具辊(50)和所述收料辊(80)之间进一步设置有用于向所述膜层的两侧喷洒用于对所述孔洞(4)中的金属铝箔进行腐蚀的腐蚀性液体喷洒机构(60)、用于喷洒后的膜层的清洗机构(61)、用于清洗后的膜层的烘干机构(70)以及用于收卷之前的切边机构(71)。2. The manufacturing system according to claim 1 is characterized in that a spraying mechanism (60) for spraying a corrosive liquid to both sides of the film layer for corroding the metal aluminum foil in the hole (4), a cleaning mechanism (61) for the film layer after spraying, a drying mechanism (70) for the cleaned film layer, and a trimming mechanism (71) before winding are further provided between the mold roller (50) and the receiving roller (80). 3.如权利要求2所述的制造系统，其特征在于，所述基材送料辊(10)和铝箔送料辊(20)之间设置有用于在所述基材层(1)的两侧涂覆胶黏剂的一对涂胶辊(11)；所述金属铝箔(2)通过一对粘接辊(21)挤压贴合在涂胶的基材层(1)的两侧；所述碾压保护膜(3)通过一对贴附辊(31)附着在所述金属铝箔(2)的外侧。3. The manufacturing system as described in claim 2 is characterized in that a pair of glue coating rollers (11) for coating adhesive on both sides of the substrate layer (1) are arranged between the substrate feeding roller (10) and the aluminum foil feeding roller (20); the metal aluminum foil (2) is squeezed and bonded to both sides of the glue-coated substrate layer (1) by a pair of bonding rollers (21); and the laminated protective film (3) is attached to the outer side of the metal aluminum foil (2) by a pair of attachment rollers (31). 4.如权利要求3所述的制造系统，其特征在于，所述粘接辊(21)和贴附辊(31)之间设置有用于在所述金属铝箔(2)的外侧涂覆润滑油的一对涂油辊(22)。4. The manufacturing system according to claim 3 is characterized in that a pair of oiling rollers (22) for applying lubricating oil to the outer side of the metal aluminum foil (2) are arranged between the bonding roller (21) and the attaching roller (31). 5.如权利要求4所述的制造系统，其特征在于，所述贴附辊(31)和碾压辊(40)之间设置有对所述膜层进行加热的第一加热装置(32)。5. The manufacturing system according to claim 4, characterized in that a first heating device (32) for heating the film layer is provided between the attaching roller (31) and the laminating roller (40). 6.如权利要求5所述的制造系统，其特征在于，所述碾压辊(40)和模具辊(50)之间设置有用于对所述膜层进行加热退火的第二加热装置(41)。6. The manufacturing system according to claim 5, characterized in that a second heating device (41) for heating and annealing the film layer is provided between the laminating roller (40) and the mold roller (50). 7.如权利要求1-6之一所述的制造系统，其特征在于，沿着所述膜层的前进方向设置有多对长度依次增加的碾压辊(40)，沿所述膜层的两个侧边分别设置有一套夹持拉伸机构(42)，所述夹持拉伸机构(42)包括一个环形轨道(421)以及沿所述环形轨道(421)循环移动的多个夹持钳(422)，所述夹持钳(422)夹持所述膜层的侧边沿所述碾压辊(40)的轴向对所述膜层进行横向夹持拉伸。7. A manufacturing system as described in any one of claims 1 to 6, characterized in that a plurality of pairs of rolling rollers (40) with increasing lengths are arranged along the forward direction of the film layer, and a set of clamping and stretching mechanisms (42) are respectively arranged along the two side edges of the film layer, and the clamping and stretching mechanisms (42) include an annular track (421) and a plurality of clamping pliers (422) that circulate along the annular track (421), and the clamping pliers (422) clamp the side edges of the film layer and perform transverse clamping and stretching on the film layer along the axial direction of the rolling roller (40). 8.如权利要求1-6之一所述的制造系统，其特征在于，所述模具辊(50)的外表面均匀设置有多个用于刺破所述金属铝箔(2)和碾压保护膜(3)形成所述孔洞(4)的突刺(51)。8. The manufacturing system according to any one of claims 1 to 6, characterized in that the outer surface of the mold roller (50) is evenly provided with a plurality of thorns (51) for piercing the metal aluminum foil (2) and rolling the protective film (3) to form the holes (4).
CN202311770839.9A 2023-12-20 2023-12-20 Manufacturing system for composite aluminum foil film Pending CN118578728A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311770839.9A CN118578728A (en) 2023-12-20 2023-12-20 Manufacturing system for composite aluminum foil film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311770839.9A CN118578728A (en) 2023-12-20 2023-12-20 Manufacturing system for composite aluminum foil film

Publications (1)

Publication Number Publication Date
CN118578728A true CN118578728A (en) 2024-09-03

Family

ID=92530754

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311770839.9A Pending CN118578728A (en) 2023-12-20 2023-12-20 Manufacturing system for composite aluminum foil film

Country Status (1)

Country Link
CN (1) CN118578728A (en)

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03222257A (en) * 1990-01-25 1991-10-01 Sony Corp Manufacture of lithium electrode for lithium battery
TW201410344A (en) * 2012-09-13 2014-03-16 China Steel Corp Aluminum foil and producing method of the same
CN104205424A (en) * 2012-02-17 2014-12-10 奥克斯能源有限公司 Reinforced metal foil electrode
CN206834275U (en) * 2017-06-13 2018-01-02 中能国盛动力电池技术（北京）股份公司 A kind of high multiplying power lithium ion battery
CN208433469U (en) * 2018-04-28 2019-01-25 界首市菁华科技信息咨询服务有限公司 A kind of energy-saving lead acid accumulator plate grid preparation facilities
US20200280049A1 (en) * 2019-03-01 2020-09-03 Tsinghua University Current collector and anode electrode of lithium ion battery, and method for fabricating the same
CN213340440U (en) * 2020-11-20 2021-06-01 江西安驰新能源科技有限公司 Novel lithium battery current collector
CN113001855A (en) * 2021-03-03 2021-06-22 浙江世鼎橡胶工业有限公司 Rolling machine is used in production of sealed diaphragm
CN215815945U (en) * 2021-03-24 2022-02-11 湖北亿纬动力有限公司 A lightweight composite current collector, including its electrode pole piece and lithium ion battery
CN114103386A (en) * 2021-11-16 2022-03-01 上海联净电子科技有限公司 Lithium strip calendering equipment, lithium copper double-sided compounding equipment and lithium copper double-sided compounding method
CN114361463A (en) * 2021-12-17 2022-04-15 合肥国轩高科动力能源有限公司 Preparation method of composite current collector
CN218892212U (en) * 2022-11-28 2023-04-21 广东德冠薄膜新材料股份有限公司 Inlet chain plate device for stretching film equipment

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03222257A (en) * 1990-01-25 1991-10-01 Sony Corp Manufacture of lithium electrode for lithium battery
CN104205424A (en) * 2012-02-17 2014-12-10 奥克斯能源有限公司 Reinforced metal foil electrode
TW201410344A (en) * 2012-09-13 2014-03-16 China Steel Corp Aluminum foil and producing method of the same
CN206834275U (en) * 2017-06-13 2018-01-02 中能国盛动力电池技术（北京）股份公司 A kind of high multiplying power lithium ion battery
CN208433469U (en) * 2018-04-28 2019-01-25 界首市菁华科技信息咨询服务有限公司 A kind of energy-saving lead acid accumulator plate grid preparation facilities
US20200280049A1 (en) * 2019-03-01 2020-09-03 Tsinghua University Current collector and anode electrode of lithium ion battery, and method for fabricating the same
CN213340440U (en) * 2020-11-20 2021-06-01 江西安驰新能源科技有限公司 Novel lithium battery current collector
CN113001855A (en) * 2021-03-03 2021-06-22 浙江世鼎橡胶工业有限公司 Rolling machine is used in production of sealed diaphragm
CN215815945U (en) * 2021-03-24 2022-02-11 湖北亿纬动力有限公司 A lightweight composite current collector, including its electrode pole piece and lithium ion battery
CN114103386A (en) * 2021-11-16 2022-03-01 上海联净电子科技有限公司 Lithium strip calendering equipment, lithium copper double-sided compounding equipment and lithium copper double-sided compounding method
CN114361463A (en) * 2021-12-17 2022-04-15 合肥国轩高科动力能源有限公司 Preparation method of composite current collector
CN218892212U (en) * 2022-11-28 2023-04-21 广东德冠薄膜新材料股份有限公司 Inlet chain plate device for stretching film equipment

Similar Documents

Publication Publication Date Title
EP0298800B1 (en) Process for making a multilayer structure for use in thin-layer electrochemical generators with a thin layer of lithium and a solid polymer electrolyte
JP4128058B2 (en) Adhesive film and method of using the same
JP4594039B2 (en) Laminated film covered lithium foil
JP2005183181A (en) Non-aqueous electrolyte secondary battery electrode plate and method for producing the same
CN114361463A (en) Preparation method of composite current collector
CN114023925A (en) Preparation method of lithium-copper composite metal negative electrode
JP4870359B2 (en) Degreasing method of aluminum foil
JP5254663B2 (en) Manufacturing method of packaging material for battery case
CN221720124U (en) Composite aluminum foil film manufacturing system
WO2025148298A1 (en) Pressing mechanism, composite current collector preparation apparatus and method, and battery production system
JPH10144303A (en) Manufacture of electrode sheet and its device
KR102665240B1 (en) Film for cell pouch with improved coating uniformity and manufacturing method thereof
CN118636544A (en) A composite aluminum foil film and preparation method thereof
JP2001043848A (en) Method for producing polymer battery and peeling device
CN221985890U (en) Preparation system of polyester film for composite aluminum foil film
JP7859417B2 (en) Manufacturing method of current collector foil
KR102672312B1 (en) Film for cell pouch with improved coating uniformity and manufacturing method thereof
JP2001283896A (en) Battery manufacturing method and battery
US20260061734A1 (en) Metal or alloy film release by low sublimation release layer for electrochemical device
JP2024169971A (en) Manufacturing method of composite current collector
JP4756979B2 (en) Manufacturing method of organic resin-coated metal plate and manufacturing apparatus of organic resin-coated metal plate
JP3564928B2 (en) Manufacturing method of thin film solar cell
CN120793912A (en) Graphene roll-to-roll transfer equipment and transfer method
JP2001110694A (en) Carrier tape having peelable heat-sealing layer
JP3952382B2 (en) Method for producing resin-coated metal sheet

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination