CN112439784A - Production method of composite metal belt based on liquid metal - Google Patents

Production method of composite metal belt based on liquid metal Download PDF

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Publication number
CN112439784A
CN112439784A CN201910807875.5A CN201910807875A CN112439784A CN 112439784 A CN112439784 A CN 112439784A CN 201910807875 A CN201910807875 A CN 201910807875A CN 112439784 A CN112439784 A CN 112439784A
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CN
China
Prior art keywords
metal
strip
liquid metal
liquid
material layer
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Application number
CN201910807875.5A
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Chinese (zh)
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CN112439784B (en
Inventor
辛民昌
李长明
吴超
辛程勋
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Qingdao Jiuhuan Xinyue New Energy Technology Co ltd
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Qingdao Jiuhuan Xinyue New Energy Technology Co ltd
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Priority to CN201910807875.5A priority Critical patent/CN112439784B/en
Publication of CN112439784A publication Critical patent/CN112439784A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/32—Processes for applying liquids or other fluent materials using means for protecting parts of a surface not to be coated, e.g. using stencils, resists
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
    • B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
    • B05D3/0426—Cooling with air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B2015/0057—Coiling the rolled product

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The invention discloses a production method of a composite metal belt based on liquid metal, which comprises the following steps: a coating process, which is used for coating a liquid metal layer on at least one side surface of the strip; and a shaping procedure, which is used for cooling and shaping the liquid metal layer and forming a metal material layer on the strip to obtain the composite metal strip. According to the production method of the composite metal belt based on the liquid metal, the thickness of the metal material layer can be thinner, and the bonding force is better.

Description

Production method of composite metal belt based on liquid metal
Technical Field
The invention relates to a production method of a metal belt, in particular to a production method of a composite metal belt based on liquid metal.
Background
The negative electrode of the lithium ion battery is formed by uniformly coating a paste adhesive prepared by mixing a negative electrode active material carbon material or non-carbon material, a binder and an additive on two sides of a copper foil, drying and rolling. The key to successful production of lithium ion batteries is the ability to produce negative electrode materials that reversibly deintercalate/intercalate lithium ions. In general, the selection of a good anode material should follow the following principle: the specific energy is high; the electrode potential relative to the lithium electrode is low; the reversibility of charge-discharge reaction is good; the compatibility with electrolyte and binder is good; small specific surface area (<10m2(g) high true density>2.0g/cm3) (ii) a The size and the mechanical stability are good in the lithium embedding process; the resources are rich and the price is low; stable in air and has no toxic side effect. At present, the negative electrode material that has been practically used in lithium ion batteries is generally a carbon material such as graphite, soft carbon (e.g., coke, etc.), hard carbon, and the like. Although the traditional carbon material can meet the use requirements of the negative electrode of the lithium ion battery to a certain extent, the traditional carbon material has the defects of low energy density, heavy weight and the like.
The lithium metal has high capacity (theory 3860mAh/g) and low density (0.59 g/cm)3) Since the electrochemical potential is low (-3.04vvs. standard hydrogen electrode), a lithium metal secondary battery having a negative electrode made of lithium metal has superior performance in that the voltage is high and the energy density is high, compared with a lithium ion battery having a negative electrode made of graphite. In order to meet the requirement of high-rate discharge of the lithium battery, an ultrathin anode suitable for high-rate discharge is adopted, and therefore, a metal lithium cathode matched with the capacity of the anode is also ultrathin. However, commercially available battery-grade lithium metal is generally thicker, only a small number of manufacturers can provide lithium metal with the thickness of 50-100 μm and the width of 10-50mm, and the lithium metal has poor surface state, high difficulty in laminating with a conductive base material and low laminating strength.
The existing lithium belt production process generally adopts extrusion forming, for example, in the lithium belt production process disclosed in Chinese patent with publication numbers of CN204564801U and CN101497088B, the thinnest thickness can be dozens of microns. When a thicker metal lithium belt is applied to the metal lithium battery, the capacity of the negative electrode is far more than that of the positive electrode, so that the waste of the metal lithium of the negative electrode is caused, the volume and the weight of the battery are increased, the volume and the mass energy density of the battery are reduced, and the promotion of the limit energy density of the metal lithium battery is not facilitated. In addition, chinese patent publication No. CN105489845A proposes a PVD-based method for preparing a thin lithium metal-based negative electrode, which can prepare lithium metal with a relatively thin thickness, but the method cannot be applied to large-area mass production.
The existing negative electrode metal composite material is generally obtained by compounding a metal lithium foil and a metal copper foil, for example, Chinese patent with publication number CN108435791A discloses a deep cooling asynchronous rolling method for preparing a layered copper/lithium composite foil, which comprises the following steps: the first step is as follows: pure lithium and pure copper metal foils are used as raw materials, and the thickness of the copper foil is half of that of the lithium foil; the second step is that: cutting the copper foil and the lithium foil into a rectangle; the third step: folding the copper foil in half, and completely coating the lithium foil; the fourth step: the material is put into a deep cooling tank for cooling for 10 minutes to realize that the temperature of the material is uniformly cooled; the fifth step: taking out the material, carrying out deep cooling rolling at a reduction rate of about 50%, and after rolling is finished, keeping the temperature of a rolled piece below-50 ℃; and a sixth step: folding and overlapping the rolled strip, and putting the strip into a deep cooling box for re-cooling for 3-5 minutes; the seventh step: carrying out deep cooling rolling on the cooled material, and maintaining the reduction rate at about 50%; repeating the sixth step and the seventh step for 5-10 times to produce a high-performance layered copper/lithium bimetal composite foil; eighth step: putting the layered copper/lithium bimetal composite foil into a deep cooling box for cooling again for 3-5 minutes; the ninth step: deep cooling asynchronous rolling is adopted, the differential speed ratio is 1.0-1.6, and the rolling reduction is 5-20%; and repeating the eighth step and the ninth step until the thickness of the rolled piece is rolled to 10-50 mu m.
The cathode metal composite material prepared by the deep cooling asynchronous rolling method for preparing the layered copper/lithium composite foil has the following defects:
1) the preparation of a lithium belt with the thickness of 2-20 um on the surface of the copper foil is difficult, namely, the thickness of metal lithium is thick, and materials are wasted;
2) in the prepared cathode metal composite material, the binding force of metal lithium and metal copper is not firm enough and is easy to fall off.
Disclosure of Invention
In view of the above, the present invention is directed to a method for producing a composite metal strip based on liquid metal, wherein the thickness of the metal material layer can be thinner and the bonding force is better.
In order to achieve the purpose, the invention provides the following technical scheme:
a method of producing a composite metal strip based on liquid metal, comprising:
a coating process, which is used for coating a liquid metal layer on at least one side surface of the strip;
and a shaping procedure, which is used for cooling and shaping the liquid metal layer and forming a metal material layer on the strip to obtain the composite metal strip.
Further, in the coating procedure, a spraying device is used for spraying liquid metal to the diffuse reflection surface, so that the liquid metal is sprayed on the side surface of the strip after the diffuse reflection of the diffuse reflection surface, and the liquid metal layer is obtained; or the like, or, alternatively,
in the coating procedure, a liquid metal layer is obtained by brushing liquid metal on the side surface of the strip by using a brush roller set; or the like, or, alternatively,
in the coating procedure, a spraying device is used for spraying liquid metal on the side surface of the strip to obtain the liquid metal layer; or the like, or, alternatively,
in the coating process, a liquid metal coating is coated on the side surface of the strip by using a strip roller to obtain the liquid metal layer.
Further, in the shaping step, the liquid metal layer prepared in the coating step is cooled by a cooling device according to a set temperature-time control line.
Further, a thickness control device is adopted to control the thickness of the liquid metal layer.
Further, the thickness control device comprises a thickness control roller set, and the thickness control roller set comprises thickness control rollers which are respectively positioned on two sides of the strip.
Further, a coating high-temperature area used for keeping liquid metal in a liquid state and fluidity is arranged on the feeding side of the thickness control roller group; and the cooling device is arranged on the discharging side of the thickness control roller set.
Furthermore, the cooling device comprises a cooling unit which is arranged corresponding to the side surface of the strip coated with the liquid metal layer, the cooling unit comprises a first air guide partition plate, a first cold air channel which is opposite to the discharging side of the thickness control roller set and blows cooling media is arranged on the outer side of the first air guide partition plate, which is opposite to the strip, and a first return channel for returning the cooling media is formed between the first air guide partition plate and the strip.
Further, after the liquid metal sprayed by the spraying device is subjected to diffuse reflection by the diffuse reflection surface, the liquid metal forms an atomized water droplet shape and is sprayed on the side surface of the strip.
Further, the spraying device adopts a linear nozzle to directly spray the liquid metal on the side surface of the strip, or the spraying device atomizes the liquid metal and then sprays the atomized liquid metal on the side surface of the strip.
Further, the strip material adopts but not limited to a copper strip, an aluminum strip, a steel strip, a nickel strip, a silver strip, a gold strip or a strip material compounded by metal materials and nonmetal materials.
Furthermore, the strip adopts a net-shaped foil or the strip is provided with through holes in an array mode.
Further, the metal material for forming the metal material layer is selected from, but not limited to, metal lithium, metal sodium, metal potassium, metal magnesium, metal calcium, metal zinc, metal aluminum or metal silver; or the metal material used for forming the metal material layer is an alloy prepared by at least two of metal lithium, metal sodium, metal potassium, metal magnesium, metal calcium, metal zinc, metal aluminum and metal silver in a ratio.
Further, a first edge pressing device which is used for pressing the two side edges of the strip material and preventing the liquid metal from covering is arranged in the coating process, and the first edge pressing device is used for preventing the liquid metal from covering the two side edges of the strip material and forming a white space on the two side edges of the strip material.
Further, the method comprises a finishing procedure, wherein the composite metal belt is sequentially finished by utilizing at least one group of finishing roller groups, so that the thickness and the surface precision of the metal material layer reach set ranges.
Further, the ambient temperature in the finishing process is controlled to keep the metal material layer in a temperature range convenient for finishing.
Furthermore, the method also comprises a thickening procedure for thickening the metal material layer and obtaining a thickened metal material layer.
Further, in the thickening process, a powder spraying device is used for uniformly spraying metal particles or metal powder with the same material as the metal material layer, and a roller group is used for rolling the metal particles or the metal powder and the metal material layer into a whole to obtain the thickened metal material layer; arranging a powder spraying high-temperature area at the feeding side of the roll group, wherein the powder spraying high-temperature area is used for enabling the metal material layer to be capable of adhering the metal particles or the metal powder and keeping the metal material layer and the metal particles or the metal powder in a temperature range convenient for roll forming; and arranging a powder spraying cooling device on the discharge side of the roller group, wherein the powder spraying cooling device is used for cooling and shaping the thickened metal material layer.
Furthermore, the powder spraying cooling device comprises a powder spraying cooling unit which is arranged corresponding to the side face of the thickened metal material layer, wherein the powder spraying cooling unit comprises a second air guide partition plate, a second cold air channel which is opposite to the discharging side blowing cooling medium of the roller group is arranged on the outer side of the second air guide partition plate, which is opposite to the strip, and a second backflow channel for backflow of the cooling medium is formed between the second air guide partition plate and the strip.
Further, in the thickening process, a coating roller set is used for coating molten metal which is the same as the molten metal on the metal material layer to obtain the thickened metal material layer; and a coating high-temperature area for keeping the molten metal in a molten state is arranged on the feeding side of the coating roller group, and a coating cooling device for cooling and shaping the thickened metal material layer is arranged on the discharging side of the coating roller group.
Further, coating cooling device includes and is equipped with the strip the coating cooling unit that the side correspondence of thickening metallic material layer set up, coating cooling unit includes third wind-guiding baffle, the outside of third wind-guiding baffle dorsad strip is equipped with just right the ejection of compact side-blown cooling medium's of roll set third cold wind passageway, form the third return passage who is used for the cooling medium backward flow between third wind-guiding baffle and the strip.
Furthermore, a molten metal feeding device is provided on the feed side of the paint roller set, and the molten metal feeding device employs a spray gun or a screw extrusion feeding device for feeding the paint roller set.
And further, second edge pressing devices which are pressed on the two side edges of the strip material are arranged in the thickening process, and the second edge pressing devices are used for forming a blank area on the two side edges of the strip material.
Further, before entering the coating process, edge-covering films which do not stick to the metal material are compounded on the two side edges of the strip material or colloid which does not stick to the metal material is sprayed on the two side edges of the strip material.
Further, before the composite metal belt is rolled, the edge covering films which are compounded on the edges of the two sides of the belt material are uncovered, or the colloid which is sprayed on the edges of the two sides of the belt material is scraped off, and then the belt material is rolled.
The invention has the beneficial effects that:
according to the production method of the composite metal belt based on the liquid metal, the liquid metal layer is formed on the side surface of the belt material, and due to the fact that the temperature of the liquid metal is high, the metal material layer obtained by cooling and shaping the liquid metal layer can be tightly combined with the surface of the belt material, and the liquid metal is plated on the surface of the belt material similarly, and the binding force is improved; in addition, because the viscosity and the fluidity of the high-temperature liquid metal are low and high, the liquid metal forms a metal material layer on the surface of the strip after flowing on the surface of the strip, the thickness of the metal material layer can be very thin, and the thickness can be controlled below 1um similarly to the liquid metal plated on the surface of the strip; the method for producing the composite metal belt based on the liquid metal can accurately control the thickness of the metal material layer, namely the thickness can be thinner to meet the use requirement of the energy storage electrode, and the bonding force is better.
Through setting up the thickening process, the accessible is dusted the thickness that rolling or modes such as solution coating increase the metallic material layer, obtains the thickening metal level, owing to in the coating process, has guaranteed the cohesion intensity between metallic material layer and the strip, consequently, after thickening the metallic material layer again, can maintain the cohesion intensity between thickening metallic material layer and the strip. After the metal material layer is thickened, the use requirements of use scenes such as an energy storage electrode can be met.
Through setting up the finishing process, not only can the thickness of finishing metal material layer and the surface accuracy of control metal material layer, in the finishing process, through the control to the temperature, can effectively eliminate the intraformational internal stress of metal material, improve the plasticity of metal material layer, prevent defects such as crackle in the metal material layer, improve product quality moreover.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
FIG. 1 is a schematic view of the principle of the apparatus suitable for the first variant of embodiment 1 of the method for producing a composite metal strip based on liquid metal according to the invention;
FIG. 2 is a schematic view of the principle of the apparatus suitable for the second variant of embodiment 1 of the method for producing a composite metal strip based on liquid metal according to the invention;
FIG. 3 is a schematic view of the principle of the apparatus suitable for the third embodiment of the liquid metal based composite metal strip production method of embodiment 1 of the present invention;
FIG. 4 is a schematic view of a first edge pressing apparatus;
FIG. 5 is detail A of FIG. 4;
FIG. 6 is a schematic view of the principle of the apparatus suitable for the first embodiment of the liquid metal based composite metal strip production method of embodiment 2 of the present invention;
FIG. 7 is a schematic view of the principle of the apparatus suitable for the second variant of embodiment 2 of the method for producing a composite metal strip based on liquid metal according to the invention;
FIG. 8 is a schematic view of the principle of the apparatus suitable for the third embodiment of the liquid metal based composite metal strip production method of embodiment 2 of the present invention;
FIG. 9 is a schematic view of the principle of the apparatus suitable for the first embodiment of the liquid metal based composite metal strip production method of example 3 of the present invention;
FIG. 10 is a schematic view of the principle of the apparatus suitable for the second variant of embodiment 3 of the method for producing a composite metal strip based on liquid metal according to the invention;
FIG. 11 is a schematic view of the principle of an apparatus suitable for the third embodiment of the liquid metal-based composite metal strip production method of example 3 of the present invention;
fig. 12 is a schematic view of the principle of an apparatus suitable for use in embodiment 4 of the liquid metal-based composite metal strip production method of the present invention.
Description of reference numerals:
1-a strip; 2-a composite metal strip; 3-a layer of metallic material; 4-a white space;
10-an unwinding mechanism; 20-high temperature zone; 21-a diffuse reflective surface; 22-an injection device; 23-a thickness control roller set; 24-a first hold-down device; 25-brush roller group; 25 a-a storage tank; 25 b-a feed roll; 26-a spray coating device; 27-set of belt rollers; 28-screw feed device;
30-a cooling zone; 31-a first air guiding clapboard; 32-a first cold air channel; 33-a first return channel;
40-powder spraying high-temperature area; 41-powder spraying device; 42-a roll stack; 43-a second air guiding clapboard; 43 a-a second cold air channel; 43 b-a second return channel; 46-a set of coating rollers; 47-molten metal feed means; 48-coating a high-temperature area; 49-a third air guiding clapboard; 49 a-a third cold air channel; 49 b-a third return channel;
50-finishing section; 51-a finishing roller set; 52-roll set of rolls;
60-a winding mechanism.
Detailed Description
The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
Example 1
Fig. 1 is a schematic diagram of a first embodiment of the apparatus for the embodiment 1 of the method for producing a composite metal strip based on liquid metal according to the present invention. The liquid metal-based composite metal strip production equipment comprises:
the unwinding mechanism 10 is used for unwinding the strip 1;
a coating station for applying a liquid metal layer 3 of a metal material on at least one side of the strip 1. In the coating station of this embodiment, a diffuse reflection surface 21 and a spraying device 22 are provided, the spraying device 22 is used for spraying liquid metal onto the diffuse reflection surface, and the diffuse reflection surface 22 is used for diffusely reflecting the liquid metal and spraying the diffusely reflected liquid metal onto the side surface of the strip 1 to form a liquid metal layer. In the present embodiment, the liquid metal layer is sprayed on both sides of the strip 1, and of course, the liquid metal layer may be sprayed only on one side of the strip 1, which will not be described in detail.
A shaping working section, wherein a cooling device is arranged in the shaping working section, so that the liquid metal layer is cooled and shaped, and a metal material layer is formed on the strip 1 to obtain a composite metal strip; specifically, the cooling device cools the liquid metal layer prepared by the coating workshop section according to a set temperature-time control line.
And the winding mechanism 60 is used for winding the obtained composite metal belt 2.
Further, the liquid metal-based composite metal strip production apparatus of the present embodiment further includes a thickness control device for controlling a thickness of the liquid metal layer. The thickness control device of the present embodiment includes a thickness control roller group 23, and the thickness control roller group 23 includes thickness control rollers on both sides of the strip, respectively. The feed side of the thickness control roll group 23 of the present embodiment is set as a coating high-temperature zone 20 for keeping the liquid metal liquid and fluidity; the cooling device is arranged at the discharging side of the thickness control roller group 23, namely the cooling device is arranged at the discharging side of the thickness control roller group 23 and is provided with a cooling area 30 for cooling and shaping the liquid metal.
Further, the cooling device of the embodiment includes a cooling unit disposed corresponding to the side of the strip 1 coated with the liquid metal layer, the cooling unit includes a first air guiding partition plate 31, a first cold air channel 32 facing the discharging side of the thickness control roller set 23 is disposed on the outer side of the first air guiding partition plate 31 opposite to the strip, and a first return channel 33 for returning the cooling medium is formed between the first air guiding partition plate 31 and the strip 1. The cooling medium is directly blown to the discharging side of the thickness control roller group 23, so that the liquid metal can be immediately cooled and shaped after passing through the thickness control roller group 23, the uneven thickness of the metal material layer caused by the better fluidity of the liquid metal is prevented, and the metal material layer with controllable and even thickness can be obtained.
Further, the diffuse reflection surface 21 diffusely reflects the liquid metal and enables the liquid metal to be coated on the strip 1 in an atomized water drop shape, namely the diffuse reflection surface 21 is uneven to realize diffuse reflection of the liquid metal, and the liquid metals subjected to diffuse reflection collide with each other and are atomized and then sprayed on the strip 1, so that the situation that the liquid metal directly sprayed can be melted and punctured when the temperature of the liquid metal is higher and approaches the melting point of the strip 1 is avoided.
Preferably, a first edge pressing device 24 is provided in the coating station for pressing on the two side edges of the strip and preventing the liquid metal from covering them, the first edge pressing device 24 being intended to prevent the liquid metal from covering the two side edges of the strip and forming the white spaces 4 in the two side edges of the strip 1, as shown in fig. 4-5.
Further, the composite metal strip production equipment based on liquid metal in the embodiment further comprises a finishing section 50, wherein at least one group of finishing roller sets 51 for rolling the composite metal strip in sequence are arranged in the finishing section, so that the thickness and the surface precision of the metal material layer 3 reach set ranges. Specifically, a finishing temperature control device for keeping the metal material layer in a temperature range convenient for finishing forming is also arranged in the finishing working section. Through setting up the finishing workshop section, not only can the thickness of finishing metal material layer and the surface accuracy of control metal material layer, in the finishing workshop section, through the control to the temperature, can effectively eliminate the intraformational internal stress of metal material, improve the plasticity of metal material layer, prevent defects such as crackle in the metal material layer, improve product quality moreover. This embodiment rolls the composite metal strip 2 using the roll stack 52 before finishing the composite metal strip 2 using the finishing roll stack 51.
Further, the production plant for composite metal strips based on liquid metal according to this embodiment also comprises a thickening station for thickening the layer of metal material and obtaining a layer of thickened metal material. The thickening working section of the embodiment is arranged between the sizing working section and the finishing working section, and the finishing working section can be directly used for finishing the thickened metal material layer. And a second edge pressing device for pressing the edges of the two sides of the strip material is arranged in the thickening working section, and the second edge pressing device is used for forming a white remaining area 4 on the edges of the two sides of the strip material. The second edge pressing device of this embodiment has the same structure as that of embodiment 1, and is shown in detail in FIGS. 4-5.
Specifically, a powder spraying device 41 for uniformly spraying metal particles or metal powder with the same material as the metal material layer and a roller group 42 for rolling the metal particles or metal powder and the metal material layer into a whole to obtain the thickened metal material layer are arranged in the thickening working section; a powder spraying high-temperature area 40 is arranged on the feeding side of the roll group 42 and is used for enabling the metal material layer to be capable of adhering metal particles or metal powder and keeping the metal material layer and the metal particles or the metal powder in a temperature range convenient for rolling and forming; and a powder spraying cooling device for cooling and shaping the thickened metal material layer is arranged on the discharge side of the roller group. The powder spraying cooling device of the embodiment comprises a powder spraying cooling unit which is arranged corresponding to the side surface of the strip 1 provided with the thickened metal material layer, the powder spraying cooling unit comprises a second air guide partition plate 43, a second cold air channel 43a which is opposite to the discharging side of the roll group 42 and used for blowing cooling medium is arranged on the outer side of the second air guide partition plate 43, which is opposite to the strip 1, and a second backflow channel 43b used for backflow of the cooling medium is formed between the second air guide partition plate 43 and the strip 1, as shown in fig. 1.
Of course, the thickening section may be provided with a coating roller group 46 for coating the same molten metal as the material of the metal material layer to obtain a thickened metal material layer and a molten metal feeding device 47 for feeding the molten metal to the feed side of the coating roller group 46, the feed side of the coating roller group 46 may be provided with a high-temperature coating zone 48 for keeping the molten metal in a molten state, and the discharge side of the coating roller group 46 may be provided with a coating cooling device for cooling and sizing the thickened metal material layer. The coating and cooling device of the present embodiment includes a coating and cooling unit disposed corresponding to the side of the strip 1 having the thickened metal material layer, the coating and cooling unit includes a third air guiding partition 49, a third cold air channel 49a facing the discharging side of the coating roller set 46 and blowing the cooling medium is disposed on the outer side of the third air guiding partition 49 opposite to the strip, and a third return channel 49b for returning the cooling medium is formed between the third air guiding partition 49 and the strip 1, as shown in fig. 2. Specifically, the molten metal feeding device employs a lance or a screw extrusion feeding device for feeding the coating roller group 46.
Of course, in some embodiments, the thickening process may not be provided, as shown in fig. 3, and will not be described again.
Through setting up the thickening workshop section, the accessible is dusted rolling or the thickness that modes such as solution coating increased the metallic material layer, obtains the thickening metal level, owing to in the coating process, has guaranteed the cohesion intensity between metallic material layer and the strip, consequently, after thickening the metallic material layer again, can maintain the cohesion intensity between thickening metallic material layer and the strip. After the metal material layer is thickened, the use requirements of use scenes such as an energy storage electrode can be met.
Of course, in order to form the white remaining regions 4 on the two side edges of the strip 1, a composite working section located on the upstream side of the coating working section may be provided in the composite metal strip production apparatus based on liquid metal in the embodiment, and a composite roller set for compounding the edge-covering film of the non-stick metal material on the two side edges of the strip is provided in the composite working section; or the glue spraying section is arranged on the upstream side of the coating section and comprises a glue spraying mechanism for spraying glue which does not stick to the metal material on the edges of the two sides of the strip. At this time, an uncovering mechanism for uncovering the edge-covered film compounded on the two side edges of the strip material or a scraper mechanism for scraping the colloid sprayed on the two side edges of the strip material are arranged on the upstream side of the winding mechanism, which is not described in detail.
The following describes in detail a specific embodiment of the method for producing a composite metal strip based on liquid metal according to the present embodiment with reference to the above-mentioned apparatus.
The embodiment of the method for producing the composite metal strip based on the liquid metal comprises the following steps:
a coating step for applying a liquid metal layer to at least one side of the strip 1.
And a shaping step of cooling and shaping the liquid metal layer and forming the metal material layer 3 on the strip 1, wherein the liquid metal layer prepared by the coating step is cooled by a cooling device according to a set temperature-time control line to obtain the composite metal strip 2.
In the coating process of this embodiment, the liquid metal is sprayed onto the diffuse reflection surface 21 by the spraying device 22, and the liquid metal is sprayed onto the side surface of the strip 1 after being diffusely reflected by the diffuse reflection surface 21, so as to obtain a liquid metal layer. Specifically, after the liquid metal sprayed by the spraying device 22 is diffusely reflected by the diffuse reflection surface 21, the liquid metal forms an atomized water drop shape and is sprayed on the side surface of the strip 1, that is, the diffuse reflection surface 21 is uneven to realize diffuse reflection of the liquid metal, and after the diffusely reflected liquid metals collide with each other and are atomized, the liquid metal is sprayed on the strip 1, so that the liquid metal sprayed directly is prevented from melting and breaking down the strip when the temperature of the liquid metal is higher and approaches the melting point of the strip 1. In the present embodiment, the liquid metal layer is sprayed on both sides of the strip 1, and of course, the liquid metal layer may be sprayed only on one side of the strip 1, which will not be described in detail.
In the method for producing the composite metal strip based on the liquid metal, the liquid metal layer is formed on the side surface of the strip, and the metal material layer obtained by cooling and shaping the liquid metal layer can be tightly combined with the surface of the strip due to the high temperature of the liquid metal, so that the liquid metal is plated on the surface of the strip similarly, and the binding force is improved; in addition, because the viscosity and the fluidity of the high-temperature liquid metal are low and high, the liquid metal forms a metal material layer on the surface of the strip after flowing on the surface of the strip, the thickness of the metal material layer can be very thin, and the thickness can be controlled below 1um similarly to the liquid metal plated on the surface of the strip; the method for producing the composite metal strip based on the liquid metal can accurately control the thickness of the metal material layer, namely the thickness can be thinner to meet the use requirement of the energy storage electrode, and the bonding force is better.
Further, a thickness control device is adopted to control the thickness of the liquid metal layer. The thickness control device of the present embodiment includes a thickness control roller group 23, and the thickness control roller group 23 includes thickness control rollers on both sides of the strip 1, respectively. In the present embodiment, a coating high-temperature zone 20 for keeping the liquid metal in a liquid state and in a fluidity is provided on the feed side of the thickness control roll group 23; the discharging side of the thickness control roller group 23 is provided with a cooling device, namely, the discharging side of the thickness control roller group 23 is provided with a cooling area 30 for cooling and shaping liquid metal.
Further, the cooling device of the embodiment includes a cooling unit disposed corresponding to the side of the strip 1 coated with the liquid metal layer, the cooling unit includes a first air guiding partition plate 31, a first cold air channel 32 facing the discharging side of the thickness control roller set 23 is disposed on the outer side of the first air guiding partition plate 31 opposite to the strip, and a first return channel 33 for returning the cooling medium is formed between the first air guiding partition plate 31 and the strip 1. The cooling medium is directly blown to the discharging side of the thickness control roller group 23, so that the liquid metal can be immediately cooled and shaped after passing through the thickness control roller group 23, the uneven thickness of the metal material layer caused by the better fluidity of the liquid metal is prevented, and the metal material layer with controllable and even thickness can be obtained.
Further, the strip 1 is a strip made of, but not limited to, copper, aluminum, steel, nickel, silver, gold, or a strip made of a composite of a metal material and a non-metal material, that is, the strip 1 of this embodiment may be used as a current collector of an energy storage electrode. Specifically, the strip material can adopt a net-shaped foil material, and through holes can be arranged on the strip material in an array mode. When the metal material layer is arranged on only one side surface of the strip material 1, the metal material layer is embedded into the meshes or the through holes of the strip material 1, so that the binding force is increased, and when the metal material layers are arranged on both side surfaces of the strip material 1, the metal material layers on both sides of the strip material 1 are connected together through the meshes or the through holes, so that the binding force is further increased. Specifically, the metal material is selected from, but not limited to, metal lithium, metal sodium, metal potassium, metal magnesium, metal calcium, metal zinc, metal aluminum or metal silver; or an alloy of at least two of metal lithium, metal sodium, metal potassium, metal magnesium, metal calcium, metal zinc, metal aluminum and metal silver. That is, the metal material selected in this embodiment may be used as an active material of the energy storage electrode, that is, the composite metal tape of this embodiment may be used as the energy storage electrode, specifically, the tape of this embodiment is a copper tape, and the metal material is metal lithium. Specifically, the temperature of the liquid metal of the lithium metal material of the embodiment is equivalent to the melting point of the copper metal, for example, the temperature range of the liquid metal lithium can be 800-.
Further, a first edge pressing device 24 for pressing both side edges of the strip and preventing the liquid metal from covering is provided in the coating process, and the first edge pressing device 24 is used for preventing the liquid metal from covering both side edges of the strip 1 and forming the margin regions 4 at both side edges of the strip, as shown in fig. 4-5. .
Further, the method for producing the composite metal strip based on the liquid metal of the present embodiment further includes a finishing process of sequentially finishing the composite metal strip 2 by using at least one set of finishing roller set 51, so that both the thickness and the surface accuracy of the metal material layer reach the set range. The ambient temperature within the finishing process is controlled to maintain the layer of metallic material within a temperature range that facilitates finishing. Through setting up the finishing process, not only can the thickness of finishing metal material layer and the surface accuracy of control metal material layer, in the finishing process, through the control to the temperature, can effectively eliminate the intraformational internal stress of metal material, improve the plasticity of metal material layer, prevent defects such as crackle in the metal material layer, improve product quality moreover. This embodiment rolls the composite metal strip 2 using the roll stack 52 before finishing the composite metal strip 2 using the finishing roll stack 51.
Further, the method for producing the composite metal strip based on the liquid metal according to the embodiment is further provided with a thickening process for thickening the metal material layer and obtaining the thickened metal material layer. The thickening process of the present embodiment is provided between the sizing process and the finishing process, that is, the thickening metal material layer can be finished directly by the finishing process. And a second edge pressing device for pressing the edges of the two sides of the strip material is arranged in the thickening process, and the second edge pressing device is used for forming a white remaining area 4 on the edges of the two sides of the strip material. The second edge pressing device of this embodiment has the same structure as that of embodiment 1, and is shown in detail in FIGS. 4-5.
Specifically, in the thickening process, the powder spraying device 41 is used for uniformly spraying metal particles or metal powder with the same material as the metal material layer, and the roller group 42 is used for rolling the metal particles or metal powder and the metal material layer into a whole to obtain the thickened metal material layer; a powder spraying high-temperature area 40 is arranged on the feeding side of the roll group 42, and the powder spraying high-temperature area 40 is used for enabling the metal material layer to be adhered with metal particles or metal powder and keeping the metal material layer and the metal particles or the metal powder in a temperature range convenient for rolling and forming; and a powder spraying cooling device is arranged on the discharge side of the roll group 42 and is used for cooling and shaping the thickened metal material layer. The powder spraying cooling device of the embodiment comprises a powder spraying cooling unit which is arranged corresponding to the side surface of the strip 1 provided with the thickened metal material layer, the powder spraying cooling unit comprises a second air guide partition plate 43, a second cold air channel 43a which is opposite to the discharging side of the roll group 42 and used for blowing cooling medium is arranged on the outer side of the second air guide partition plate 43, which is opposite to the strip 1, and a second backflow channel 43b used for backflow of the cooling medium is formed between the second air guide partition plate 43 and the strip 1, as shown in fig. 1.
Of course, in the thickening step, the coating roller set 46 may be used to coat the metal material layer with a molten metal of the same material as the metal material layer to obtain a thickened metal material layer; a high-temperature zone 48 of the paint is provided on the feed side of the paint roller group 46 to keep the molten metal in a molten state, and a paint cooling device is provided on the discharge side of the paint roller group to cool and set the thickened metallic material layer. The coating and cooling device of the present embodiment includes a coating and cooling unit disposed corresponding to the side of the strip 1 having the thickened metal material layer, the coating and cooling unit includes a third air guiding partition 49, a third cold air channel 49a facing the discharging side of the coating roller set 46 and blowing the cooling medium is disposed on the outer side of the third air guiding partition 49 opposite to the strip, and a third return channel 49b for returning the cooling medium is formed between the third air guiding partition 49 and the strip 1, as shown in fig. 2. Specifically, the molten metal feeding device employs a lance or a screw extrusion feeding device for feeding the coating roller group 46. Specifically, a molten metal feeding device is provided on the feed side of the paint roller set 46, and the molten metal feeding device is a spray gun or a screw extrusion feeding device for feeding the paint roller set.
Of course, in some embodiments, the thickening process may not be provided, as shown in fig. 3, and will not be described again.
Through setting up the thickening process, the accessible is dusted the thickness that rolling or modes such as solution coating increase the metallic material layer, obtains the thickening metal level, owing to in the coating process, has guaranteed the cohesion intensity between metallic material layer and the strip, consequently, after thickening the metallic material layer again, can maintain the cohesion intensity between thickening metallic material layer and the strip. After the metal material layer is thickened, the use requirements of use scenes such as an energy storage electrode can be met.
Of course, in order to form the white spots 4 on the two side edges of the strip 1, it is also possible to compound a wrapping film of the non-stick metal material on the two side edges of the strip 1 or spray a glue of the non-stick metal material on the two side edges of the strip before entering the coating process. At this time, an uncovering mechanism for uncovering the edge-covered film compounded on the two side edges of the strip material or a scraper mechanism for scraping the colloid sprayed on the two side edges of the strip material are arranged on the upstream side of the winding mechanism, which is not described in detail.
Example 2
Fig. 6 is a schematic diagram of a first embodiment of the apparatus for the embodiment 2 of the method for producing a composite metal strip based on liquid metal according to the present invention. The liquid metal-based composite metal strip production equipment comprises:
the unwinding mechanism 10 is used for unwinding the strip 1;
a coating station for applying a liquid metal layer 3 of a metal material on at least one side of the strip 1. The coating working section of the embodiment is provided with a brush roller set 25, and the brush roller set 25 is used for uniformly coating liquid metal on the side surface of the strip to form a liquid metal layer.
A shaping working section, wherein a cooling device is arranged in the shaping working section, so that the liquid metal layer is cooled and shaped, and a metal material layer is formed on the strip 1 to obtain a composite metal strip; specifically, the cooling device cools the liquid metal layer prepared by the coating workshop section according to a set temperature-time control line.
And the winding mechanism 50 is used for winding the obtained composite metal belt 2.
The other embodiments of the liquid metal-based composite metal strip production plant are the same as in example 1 and will not be described in detail.
The following describes in detail a specific embodiment of the method for producing a composite metal strip based on liquid metal according to the present embodiment with reference to the above-mentioned apparatus.
The embodiment of the method for producing the composite metal strip based on the liquid metal comprises the following steps:
a coating step for applying a liquid metal layer to at least one side of the strip 1.
And a shaping step of cooling and shaping the liquid metal layer and forming the metal material layer 3 on the strip 1, wherein the liquid metal layer prepared by the coating step is cooled by a cooling device according to a set temperature-time control line to obtain the composite metal strip 2.
In the coating process of this example, the liquid metal was coated on the side surface of the strip by the brush roller group to obtain a liquid metal layer. Specifically, the brush roller group 25 of the present embodiment includes brush rollers respectively disposed on both sides of the strip 1, and the two brush rollers respectively coat the liquid metal layer on both side surfaces of the strip 1, but it is also possible to provide a brush roller only on one side of the strip 1, that is, coat the liquid metal layer on only one side surface of the strip. The feeding mode of the brush roller is selected according to actual conditions, if the brush roller is positioned below the strip 1, a storage tank 25a can be arranged below the brush roller, and the brush roller is partially immersed in the liquid metal in the storage tank. If the brush roller is positioned above the strip 1, the spray head can be directly utilized to spray materials to the brush roller, a feeding roller 25b parallel to the brush roller can also be arranged, the gap between the feeding roller 25b and the corresponding brush roller is smaller than the radial length of bristles of the brush roller, and liquid metal is directly added between the feeding roller 25b and the brush roller to realize feeding.
In the method for producing the composite metal strip based on the liquid metal, the liquid metal layer is formed on the side surface of the strip, and the metal material layer obtained by cooling and shaping the liquid metal layer can be tightly combined with the surface of the strip due to the high temperature of the liquid metal, so that the liquid metal is plated on the surface of the strip similarly, and the binding force is improved; in addition, because the viscosity and the fluidity of the high-temperature liquid metal are low and high, the liquid metal forms a metal material layer on the surface of the strip after flowing on the surface of the strip, the thickness of the metal material layer can be very thin, and the thickness can be controlled below 1um similarly to the liquid metal plated on the surface of the strip; the method for producing the composite metal strip based on the liquid metal can accurately control the thickness of the metal material layer, namely the thickness can be thinner to meet the use requirement of the energy storage electrode, and the bonding force is better.
Other embodiments of the method for producing a composite metal strip based on liquid metal according to the present embodiment are the same as those of embodiment 1, and will not be described in detail.
Example 3
Fig. 9 is a schematic view of the principle of the apparatus suitable for the first embodiment of embodiment 3 of the method for producing a composite metal strip based on liquid metal according to the present invention. The liquid metal-based composite metal strip production equipment comprises:
the unwinding mechanism 10 is used for unwinding the strip 1;
a coating station for applying a liquid metal layer 3 of a metal material on at least one side of the strip 1. The coating station of this embodiment is provided with a spraying device 26, and the spraying device 26 sprays the liquid metal on the side surface of the strip 1 to form a liquid metal layer. The spray coating device 26 employs a linear direct spray nozzle or an atomizing nozzle that atomizes the liquid metal and then sprays it.
A shaping working section, wherein a cooling device is arranged in the shaping working section, so that the liquid metal layer is cooled and shaped, and a metal material layer is formed on the strip 1 to obtain a composite metal strip; specifically, the cooling device cools the liquid metal layer prepared by the coating workshop section according to a set temperature-time control line.
And the winding mechanism 50 is used for winding the obtained composite metal belt 2.
The other embodiments of the liquid metal-based composite metal strip production plant are the same as in example 1 and will not be described in detail.
The following describes in detail a specific embodiment of the method for producing a composite metal strip based on liquid metal according to the present embodiment with reference to the above-mentioned apparatus.
The embodiment of the method for producing the composite metal strip based on the liquid metal comprises the following steps:
a coating step for applying a liquid metal layer to at least one side of the strip 1.
And a shaping step of cooling and shaping the liquid metal layer and forming the metal material layer 3 on the strip 1, wherein the liquid metal layer prepared by the coating step is cooled by a cooling device according to a set temperature-time control line to obtain the composite metal strip 2.
In the coating process of this example, a liquid metal was sprayed on the side surface of the strip by a spraying device to obtain a liquid metal. The spray coating device 26 employs a linear direct spray nozzle or an atomizing nozzle that atomizes the liquid metal and then sprays it. When the temperature of the liquid metal is substantially lower than the melting point of the strip 1, a linear direct-injection nozzle can be used to directly inject the liquid metal onto the surface of the strip 1. When the temperature of the liquid metal is close to the melting point of the strip 1, the liquid metal is sprayed on the surface of the strip 1 by using the atomizing nozzle, so that the liquid metal is prevented from melting and breaking through the strip. In addition, according to different use requirements, the liquid metal layer may be sprayed only on one side of the strip 1, or the liquid metal layers may be sprayed on both sides of the strip 1 at the same time, in this embodiment, the spraying devices 26 are respectively disposed on both sides of the strip 1, that is, the liquid metal layers may be sprayed on both sides of the strip 1, which will not be described in detail.
In the method for producing the composite metal strip based on the liquid metal, the liquid metal layer is formed on the side surface of the strip, and the metal material layer obtained by cooling and shaping the liquid metal layer can be tightly combined with the surface of the strip due to the high temperature of the liquid metal, so that the liquid metal is plated on the surface of the strip similarly, and the binding force is improved; in addition, because the viscosity and the fluidity of the high-temperature liquid metal are low and high, the liquid metal forms a metal material layer on the surface of the strip after flowing on the surface of the strip, the thickness of the metal material layer can be very thin, and the thickness can be controlled below 1um similarly to the liquid metal plated on the surface of the strip; the method for producing the composite metal strip based on the liquid metal can accurately control the thickness of the metal material layer, namely the thickness can be thinner to meet the use requirement of the energy storage electrode, and the bonding force is better.
Other embodiments of the method for producing a composite metal strip based on liquid metal according to the present embodiment are the same as those of embodiment 1, and will not be described in detail.
Example 4
Fig. 12 is a schematic view of the principle of the apparatus suitable for the first embodiment of embodiment 3 of the method for producing a composite metal strip based on liquid metal according to the present invention. The liquid metal-based composite metal strip production equipment comprises:
the unwinding mechanism 10 is used for unwinding the strip 1;
a coating station for applying a liquid metal layer 3 of a metal material on at least one side of the strip 1. The coating station of this embodiment is provided with a set of belt rollers 27 and a screw feeding device 28 for feeding the set of belt rollers, and the set of belt rollers 27 includes a belt roller for coating the liquid metal on the side of the strip 1 to form a liquid metal layer. The belt roller set 27 may apply the liquid metal layer only on one side of the belt material 1, or may apply the liquid metal layer on both sides of the belt material 1 at the same time, which will not be described in detail.
A shaping working section, wherein a cooling device is arranged in the shaping working section, so that the liquid metal layer is cooled and shaped, and a metal material layer is formed on the strip 1 to obtain a composite metal strip; specifically, the cooling device cools the liquid metal layer prepared by the coating workshop section according to a set temperature-time control line.
And the winding mechanism 50 is used for winding the obtained composite metal belt 2.
The other embodiments of the liquid metal-based composite metal strip production plant are the same as in example 1 and will not be described in detail.
The following describes in detail a specific embodiment of the method for producing a composite metal strip based on liquid metal according to the present embodiment with reference to the above-mentioned apparatus.
The embodiment of the method for producing the composite metal strip based on the liquid metal comprises the following steps:
a coating step for applying a liquid metal layer to at least one side of the strip 1.
And a shaping step of cooling and shaping the liquid metal layer and forming the metal material layer 3 on the strip 1, wherein the liquid metal layer prepared by the coating step is cooled by a cooling device according to a set temperature-time control line to obtain the composite metal strip 2.
In the coating process of this example, a liquid metal coating is applied to the side surface of the strip 1 by the strip roll 27 to obtain a liquid metal layer. The present embodiment uses a screw feeder 28 to feed a set of belt rollers 27, which include belt rollers that apply liquid metal to the sides of the strip 1 to form a liquid metal layer. The belt roller set 27 may apply the liquid metal layer only on one side of the belt material 1, or may apply the liquid metal layer on both sides of the belt material 1 at the same time, which will not be described in detail.
In the method for producing the composite metal strip based on the liquid metal, the liquid metal layer is formed on the side surface of the strip, and the metal material layer obtained by cooling and shaping the liquid metal layer can be tightly combined with the surface of the strip due to the high temperature of the liquid metal, so that the liquid metal is plated on the surface of the strip similarly, and the binding force is improved; in addition, because the viscosity and the fluidity of the high-temperature liquid metal are low and high, the liquid metal forms a metal material layer on the surface of the strip after flowing on the surface of the strip, the thickness of the metal material layer can be very thin, and the thickness can be controlled below 1um similarly to the liquid metal plated on the surface of the strip; the method for producing the composite metal strip based on the liquid metal can accurately control the thickness of the metal material layer, namely the thickness can be thinner to meet the use requirement of the energy storage electrode, and the bonding force is better.
Other embodiments of the method for producing a composite metal strip based on liquid metal according to the present embodiment are the same as those of embodiment 1, and will not be described in detail.
Note: the term "liquid metal" as used herein refers to a molten metal having a fluidity that meets a set requirement or a molten metal having a temperature that exceeds the boiling point of the metal material, and will not be described again.
In the process of producing the composite metal strip, according to different selections of materials of the strip and the metal material used for forming the metal material layer, a corresponding atmosphere environment needs to be adopted, and the corresponding temperature and dryness environment needs to be adopted, and the environment settings can be adjusted and selected according to the requirements of the strip and the metal material, so that technical obstacles do not exist for the technical staff in the field, and the description is omitted.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.

Claims (24)

1. A method for producing a composite metal strip based on liquid metal is characterized in that: the method comprises the following steps:
a coating step for applying a liquid metal layer to at least one side of the strip:
and a shaping procedure, which is used for cooling and shaping the liquid metal layer and forming a metal material layer on the strip to obtain the composite metal strip.
2. A method for producing a composite metal strip based on liquid metal according to claim 1, characterized in that:
in the coating procedure, a spraying device is used for spraying liquid metal to the diffuse reflection surface, so that the liquid metal is sprayed on the side surface of the strip after the diffuse reflection of the diffuse reflection surface, and the liquid metal layer is obtained; or the like, or, alternatively,
in the coating procedure, a liquid metal layer is obtained by brushing liquid metal on the side surface of the strip by using a brush roller set; or the like, or, alternatively,
in the coating procedure, a spraying device is used for spraying liquid metal on the side surface of the strip to obtain the liquid metal layer; or in the coating process, the liquid metal coating is coated on the side surface of the strip by using a strip roller to obtain the liquid metal layer.
3. A method for producing a composite metal strip based on liquid metal according to claim 1, characterized in that: and in the shaping procedure, the liquid metal layer prepared by the coating procedure is cooled by a cooling device according to a set temperature-time control line.
4. A method for producing a composite metal strip based on a liquid metal according to any one of claims 1 to 3, characterized in that: and controlling the thickness of the liquid metal layer by using a thickness control device.
5. A method for producing a composite metal strip based on liquid metal according to claim 4, characterized in that: the thickness control device comprises a thickness control roller set, and the thickness control roller set comprises thickness control rollers which are respectively positioned on two sides of the strip.
6. A method for producing a composite metal strip based on liquid metal according to claim 5, characterized in that: a coating high-temperature area used for keeping liquid metal in a liquid state and fluidity is arranged on the feeding side of the thickness control roller group; and the cooling device is arranged on the discharging side of the thickness control roller set.
7. A method for producing a composite metal strip based on liquid metal according to claim 6, characterized in that: the cooling device comprises a cooling unit which is arranged corresponding to the side surface of the strip coated with the liquid metal layer, the cooling unit comprises a first air guide partition plate, a first cold air channel which is opposite to the discharging side of the thickness control roller set and blows cooling media is arranged on the outer side of the first air guide partition plate, which is opposite to the strip, and a first return channel for returning the cooling media is formed between the first air guide partition plate and the strip.
8. A method for producing a composite metal strip based on liquid metal according to claim 2, characterized in that: after the liquid metal sprayed by the spraying device is subjected to diffuse reflection by the diffuse reflection surface, the liquid metal forms an atomized water droplet shape and is sprayed on the side surface of the strip.
9. A method for producing a composite metal strip based on liquid metal according to claim 2, characterized in that: the spraying device adopts a linear nozzle to directly spray the liquid metal on the side surface of the strip, or the spraying device atomizes the liquid metal and then sprays the atomized liquid metal on the side surface of the strip.
10. A method for producing a composite metal strip based on a liquid metal according to any one of claims 1 to 3, characterized in that: the strip material adopts but not limited to a copper strip, an aluminum strip, a steel strip, a nickel strip, a silver strip, a gold strip or a strip material compounded by metal materials and nonmetal materials.
11. A method for producing a composite metal strip based on liquid metal according to claim 10, characterized in that: the strip adopts a net-shaped foil or the strip is provided with through holes in an array mode.
12. A method for producing a composite metal strip based on a liquid metal according to any one of claims 1 to 3, characterized in that: the metal material for forming the metal material layer is selected from the group consisting of metal lithium, metal sodium, metal potassium, metal magnesium, metal calcium, metal zinc, metal aluminum and metal silver; or the metal material used for forming the metal material layer is an alloy prepared by at least two of metal lithium, metal sodium, metal potassium, metal magnesium, metal calcium, metal zinc, metal aluminum and metal silver in a ratio.
13. A method for producing a composite metal strip based on a liquid metal according to any one of claims 1 to 3, characterized in that: and a first edge pressing device which is used for pressing the edges of the two sides of the strip material and preventing the liquid metal from covering the edges of the two sides of the strip material is arranged in the coating process, and the first edge pressing device is used for preventing the liquid metal from covering the edges of the two sides of the strip material and forming a white space on the edges of the two sides of the strip material.
14. A method for producing a composite metal strip based on a liquid metal according to any one of claims 1 to 3, characterized in that: and the finishing process is used for sequentially finishing the composite metal belt by utilizing at least one group of finishing roller groups so that the thickness and the surface precision of the metal material layer reach set ranges.
15. A method of producing a composite metal strip based on liquid metal according to claim 14, characterised in that: the ambient temperature within the finishing process is controlled to maintain the layer of metallic material within a temperature range that facilitates finishing.
16. A method of producing a composite metal strip based on liquid metal according to claim 14, characterised in that: and a thickening procedure for thickening the metal material layer and obtaining a thickened metal material layer is arranged between the sizing procedure and the finishing procedure.
17. A method of producing a composite metal strip based on liquid metal according to claim 16, characterised in that: in the thickening procedure, metal particles or metal powder with the same material as the metal material layer are uniformly sprayed on the metal material layer by a powder spraying device, and the metal particles or the metal powder and the metal material layer are rolled into a whole by a roller group to obtain the thickened metal material layer; arranging a powder spraying high-temperature area at the feeding side of the roll group, wherein the powder spraying high-temperature area is used for enabling the metal material layer to be capable of adhering the metal particles or the metal powder and keeping the metal material layer and the metal particles or the metal powder in a temperature range convenient for roll forming; and arranging a powder spraying cooling device on the discharge side of the roller group, wherein the powder spraying cooling device is used for cooling and shaping the thickened metal material layer.
18. A method for producing a composite metal strip based on liquid metal according to claim 17, characterised in that: the powder spraying cooling device comprises a powder spraying cooling unit which is arranged corresponding to the side face of the thickened metal material layer and is arranged with the strip, the powder spraying cooling unit comprises a second air guide partition plate, a second cold air channel which is opposite to the side face of the strip is arranged on the outer side of the second air guide partition plate, opposite to the strip, of the discharging side of the roller group, and a second backflow channel for backflow of the cooling medium is formed between the second air guide partition plate and the strip.
19. A method of producing a composite metal strip based on liquid metal according to claim 16, characterised in that: in the thickening procedure, a coating roller set is used for coating molten metal which is the same as the molten metal on the metal material layer to obtain the thickened metal material layer; and a coating high-temperature area for keeping the molten metal in a molten state is arranged on the feeding side of the coating roller group, and a coating cooling device for cooling and shaping the thickened metal material layer is arranged on the discharging side of the coating roller group.
20. A method of producing a composite metal strip based on liquid metal according to claim 19, characterised in that: the coating cooling device comprises a coating cooling unit which is arranged corresponding to the side surface of the thickened metal material layer and comprises a third air guide partition plate, the outer side of the third air guide partition plate, facing away from the strip, is provided with a third cold air channel for blowing cooling media to the discharging side of the roller group, and a third backflow channel for backflow of the cooling media is formed between the third air guide partition plate and the strip.
21. A method of producing a composite metal strip based on liquid metal according to claim 19, characterised in that: a molten metal feeding device is arranged on the feeding side of the coating roller set, and the molten metal feeding device adopts a spray gun or a screw extrusion feeding device for feeding the coating roller set.
22. A method of producing a composite metal strip based on liquid metal according to claim 16, characterised in that: and arranging second edge pressing devices which are pressed on the two side edges of the strip material in the thickening process, wherein the second edge pressing devices are used for forming a blank area on the two side edges of the strip material.
23. A method for producing a composite metal strip based on a liquid metal according to any one of claims 1 to 3, characterized in that: before entering the coating process, compounding edge covering films which do not stick to the metal material on the two side edges of the strip material or spraying colloid which does not stick to the metal material on the two side edges of the strip material.
24. A method of producing a composite metal strip based on liquid metal according to claim 23, characterised in that: before the composite metal belt is rolled, the edge covering films compounded on the edges of the two sides of the belt material are uncovered or the colloid sprayed on the edges of the two sides of the belt material is scraped off, and then the belt material is rolled.
CN201910807875.5A 2019-08-29 2019-08-29 Composite metal belt production method based on liquid metal Active CN112439784B (en)

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