CN112439784B - Composite metal belt production method based on liquid metal - Google Patents

Composite metal belt production method based on liquid metal Download PDF

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Publication number
CN112439784B
CN112439784B CN201910807875.5A CN201910807875A CN112439784B CN 112439784 B CN112439784 B CN 112439784B CN 201910807875 A CN201910807875 A CN 201910807875A CN 112439784 B CN112439784 B CN 112439784B
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China
Prior art keywords
metal
strip
liquid metal
material layer
coating
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CN201910807875.5A
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Chinese (zh)
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CN112439784A (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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    • 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

Abstract

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

Description

Composite metal belt production method 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 pasty adhesive prepared by mixing a negative electrode active substance carbon material or non-carbon material, an adhesive and an additive on two sides of a copper foil, drying and rolling. Whether the lithium ion battery can be successfully manufactured is critical in that whether a negative electrode material capable of reversibly removing/inserting lithium ions can be prepared. In general, a good negative electrode material is chosen following the following principle: the specific energy is high; the electrode potential relative to the lithium electrode is low; the reversibility of the charge-discharge reaction is good; the compatibility with electrolyte and binder is good; Specific surface area is small<10m 2 High true density%>2.0g/cm 3 ) The method comprises the steps of carrying out a first treatment on the surface of the The size and mechanical stability in the lithium intercalation process are good; the resources are rich, and the price is low; stable in air and no toxic side effect. Currently, the cathode materials that have been practically used in lithium ion batteries are generally carbon materials, such as graphite, soft carbon (e.g., coke, etc.), hard carbon, etc. Although the traditional carbon material can meet the use requirement of the lithium ion battery cathode to a certain extent, the traditional carbon material has the defects of low energy density, heavy weight and the like.
The metallic lithium has high capacity (theoretical 3860 mAh/g), low density (0.59 g/cm) 3 ) Since the electrochemical potential (-3.04 Vvs. Standard hydrogen electrode) is low, a lithium metal secondary battery having lithium metal as a negative electrode has excellent performance of high voltage and high energy density as compared with a lithium ion battery having a graphite negative electrode. In order to meet the requirement of high-rate discharge of lithium batteries, an ultrathin positive electrode suitable for high-rate discharge is required, and therefore, a metal lithium negative electrode matched with the positive electrode capacity is required to be ultrathin. However, the commercial battery-grade metal lithium is generally thicker, only a small number of manufacturers can provide metal lithium with the width of between 10 and 50mm and the thickness of between 50 and 100 mu m, the surface state of the metal lithium is poor, the difficulty of bonding with a conductive substrate is high, and the bonding strength is low.
The existing lithium strip production process generally adopts extrusion molding, such as the lithium strip production process disclosed in Chinese patent publication No. CN204564801U, CN101497088B, and the thinnest thickness can be tens of micrometers. When the 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, meanwhile, the volume and the weight of the battery are increased, the volume and the mass energy density of the battery are reduced, and the improvement 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 thin-layer metallic lithium-based negative electrodes, which can prepare metallic lithium with a relatively thin thickness, but the method cannot be continuously produced in large-area and large-scale.
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 publication No. CN108435791A discloses a cryogenic asynchronous rolling method for preparing a layered copper/lithium composite foil, which comprises the following steps: the first step: taking pure lithium and pure copper metal foil as raw materials, wherein the thickness of the copper foil is one half of that of the lithium foil; and a second step of: cutting copper foil and lithium foil into rectangular shapes; and a third step of: folding the copper foil in half, and completely coating the lithium foil; fourth step: the material is placed into a cryogenic box for cooling for 10 minutes, so that the temperature of the material is uniformly cooled; fifth step: taking out the material, and performing cryogenic rolling at a rolling reduction of about 50 percent, wherein the temperature of a rolled piece is minus 50 ℃ after the rolling is finished; sixth step: folding and overlapping the rolled strips, and putting the strips into a deep cooling box for cooling again for 3-5 minutes; seventh step: the cooled material is subjected to deep cold rolling, and the rolling reduction is maintained to be about 50 percent; 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 cryogenic box for re-cooling for 3-5 minutes; ninth step: adopting deep cooling asynchronous rolling, wherein the speed ratio is 1.0-1.6, and the rolling reduction is 5-20%; the eighth step and the ninth step are repeated until the thickness of the rolled piece is rolled to 10-50 mu m.
The negative electrode metal composite material prepared by the deep-cooling asynchronous rolling method for preparing the layered copper/lithium composite foil has the following defects:
1) It is difficult to prepare a lithium band with the thickness of 2-20 um on the surface of the copper foil, namely, the thickness of the metal lithium is thicker, and materials are wasted;
2) In the prepared negative electrode metal composite material, the binding force of the metal lithium and the metal copper is often 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, which can make the thickness of the metal material layer thinner and the bonding force better.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a method for producing a composite metal strip based on liquid metal, comprising:
a coating process for coating a liquid metal layer on at least one side surface of the strip;
and a shaping procedure for cooling and shaping the liquid metal layer and forming a metal material layer on the strip material to obtain the composite metal strip.
Further, in the coating process, 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 being bounced by the diffuse reflection surface, and the liquid metal layer is obtained; or alternatively, the first and second heat exchangers may be,
In the coating process, a brushing roller set is utilized to brush liquid metal on the side surface of the strip material to obtain the liquid metal layer; or alternatively, the first and second heat exchangers may be,
in the coating process, spraying liquid metal on the side surface of the strip by using a spraying device to obtain the liquid metal layer; or alternatively, the first and second heat exchangers may be,
in the coating process, a liquid metal coating is coated on the side surface of the strip by using a strip roller, so as to obtain the liquid metal layer.
And a setting step of cooling the liquid metal layer prepared by the coating step by using a cooling device according to a set temperature-time control line.
Further, a thickness control device is used for controlling the thickness of the liquid metal layer.
Further, the thickness control device comprises a thickness control roller set comprising thickness control rollers respectively positioned on both sides of the strip.
Further, a coating high-temperature area for keeping the liquid metal in a liquid state and fluidity is arranged on the feeding side of the thickness control roller set; and the cooling device is arranged on the discharging side of the thickness control roller group.
Further, 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 baffle, a first cold air channel which is opposite to the outer side of the strip and used for blowing cooling medium on the discharging side of the thickness control roller set is arranged on the outer side of the first air guide baffle, and a first backflow channel for backflow of the cooling medium is formed between the first air guide baffle and the strip.
Further, after the liquid metal sprayed by the spraying device is diffusely reflected by the diffuse reflection surface, atomized water drops are formed and then sprayed on the side surface of the strip.
Further, the spraying device adopts a straight nozzle to directly spray the liquid metal on the side surface of the strip, or the spraying device sprays the atomized liquid metal on the side surface of the strip after atomizing the liquid metal.
Further, the strip material is, but not limited to, copper strip, aluminum strip, steel strip, nickel strip, silver strip, gold strip, or a strip material of a metal material in combination with a non-metal material.
Further, the strip material adopts a net-shaped foil material or through holes are arranged on the strip material in an array manner.
Further, the metal material used for forming the metal material layer adopts, but is not limited to, metal lithium, metal sodium, metal potassium, metal magnesium, metal calcium, metal zinc, metal aluminum or metal silver; or the metal material for forming the metal material layer adopts, but is not limited to, an alloy formed by proportioning at least two of metal lithium, metal sodium, metal potassium, metal magnesium, metal calcium, metal zinc, metal aluminum and metal silver.
Further, the coating process is internally provided with a first edge pressing device for pressing the two side edges of the strip and preventing the liquid metal from covering, and the first edge pressing device is used for preventing the liquid metal from covering the two side edges of the strip and forming blank spaces on the two side edges of the strip.
Further, the method further comprises a finishing procedure, wherein the composite metal belt is sequentially finished by at least one finishing roller set, so that the thickness and the surface precision of the metal material layer reach a set range.
Further, the ambient temperature in the finishing process is controlled to maintain the metallic material layer within a temperature range that facilitates finishing.
Further, a thickening process for thickening the metal material layer and obtaining a thickened metal material layer is also included.
In the thickening step, metal particles or metal powder which are the same as the metal material layer are uniformly sprayed on the metal material layer by using a powder spraying device, and the metal particles or the metal powder and the metal material layer are rolled into a whole by using a roller group, so that the thickened metal material layer is obtained; a powder spraying high-temperature area is arranged on the feeding side of the roller group, and the powder spraying high-temperature area is used for enabling the metal material layer to be adhered with 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 a powder spraying cooling device is arranged on the discharging side of the roller group and is used for cooling and shaping the thickened metal material layer.
Further, the powder spraying cooling device comprises a powder spraying cooling unit which is arranged corresponding to the side surface of the thickened metal material layer, the powder spraying cooling unit comprises a second air guide baffle, 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 baffle, and a second backflow channel for backflow of the cooling medium is formed between the second air guide baffle and the belt.
Further, in the thickening step, a coating roller set is used for coating molten metal which is the same as the material of the coating roller set on the metal material layer, so that the thickened metal material layer is obtained; 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 set, and a coating cooling device for cooling and shaping the thickened metal material layer is arranged on the discharging side of the coating roller set.
Further, the coating cooling device comprises a coating cooling unit which is arranged corresponding to the side surface of the thickened metal material layer, wherein the coating cooling unit comprises a third air guide baffle, a third 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 third air guide baffle, opposite to the roller group, and a third backflow channel for backflow of the cooling medium is formed between the third air guide baffle and the belt.
Further, a molten metal feeding device is arranged on the feeding side of the coating roller set, and a spray gun or a screw extrusion feeding device for feeding the coating roller set is adopted by the molten metal feeding device.
Further, second edge pressing devices pressed on two side edges of the strip are arranged in the thickening procedure and are used for forming blank spaces on the two side edges of the strip.
Further, before entering the coating process, the edge-covering films which do not adhere to the metal materials are compounded on the two side edges of the strip material or the colloid which does not adhere to the metal materials is sprayed on the two side edges of the strip material.
Further, before the composite metal belt is rolled, the edge-covering films compounded on the two side edges of the belt are uncovered or the colloid sprayed on the two side edges of the belt is scraped off and then rolled.
The invention has the beneficial effects that:
according to the production method of the composite metal strip based on the liquid metal, a layer of 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 lower, 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 like plating the liquid metal 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 an energy storage electrode, and the binding force is better.
Through setting up thickening process, can increase the thickness of metal material layer through modes such as powder spraying rolling or solution coating, obtain thickening metal layer, because in the coating process, guaranteed the cohesion intensity between metal material layer and the strip, consequently, after thickening again with the metal material layer, can maintain the cohesion intensity between thickening metal material layer and the strip. After the metal material layer is thickened, the use requirements of use scenes such as an energy storage electrode and the like can be met.
Through setting up the finishing process, not only can finish the thickness of metal material layer and control metal material layer's surface accuracy, in the finishing process, through controlling the temperature moreover, can effectively eliminate the internal stress in the metal material layer, improve metal material layer's plasticity, prevent defects such as crack appear in the metal material layer, improve product quality.
Drawings
In order to make the objects, technical solutions and advantageous effects of the present invention more clear, the present invention provides the following drawings for description:
fig. 1 is a schematic view of an apparatus suitable for the first version of embodiment 1 of the liquid metal-based composite metal strip production method of the present invention;
fig. 2 is a schematic view of an apparatus suitable for use in the second embodiment of example 1 of the liquid metal-based composite metal strip production method of the present invention;
Fig. 3 is a schematic view of an apparatus suitable for use in the third embodiment of embodiment 1 of the liquid metal-based composite metal strip production method of the present invention;
FIG. 4 is a schematic structural view of a first edge pressing device;
FIG. 5 is a detail A of FIG. 4;
fig. 6 is a schematic view of the apparatus for the first embodiment of example 2 of the method for producing a composite metal strip based on liquid metal according to the present invention;
fig. 7 is a schematic view of the apparatus principle of the second embodiment of example 2 of the liquid metal-based composite metal strip production method applicable to the present invention;
fig. 8 is a schematic view of an apparatus suitable for the third embodiment of embodiment 2 of the method for producing a composite metal strip based on liquid metal according to the present invention;
fig. 9 is a schematic view of the apparatus for the first embodiment of example 3 of the liquid metal-based composite metal strip production method of the present invention;
fig. 10 is a schematic view of the apparatus for the second embodiment of example 3 of the method for producing a composite metal strip based on liquid metal according to the present invention;
fig. 11 is a schematic view of an apparatus suitable for the third embodiment of embodiment 3 of the liquid metal-based composite metal strip production method of the present invention;
fig. 12 is a schematic view of an apparatus suitable for use in example 4 of the liquid metal-based composite metal strip production method of the present invention.
Reference numerals illustrate:
1-a strip; 2-a composite metal strip; a layer of 3-metal material; 4-leaving a white area;
10-unreeling mechanism; 20-a high temperature zone; 21-a diffuse reflecting surface; 22-spraying means; 23-a thickness control roller set; 24-a first edge pressing device; 25-brushing roller group; 25 a-a storage tank; 25 b-a feed roll; 26-spraying device; 27-a belt roll set; 28-screw feeding device;
30-a cooling zone; 31-a first air guide partition; 32-a first cold air channel; 33-a first return channel;
40-spraying powder in a high temperature area; 41-a powder spraying device; 42-a roll set; 43-a second air guide baffle; 43 a-a second cool air duct; 43 b-a second return channel; 46-a set of coating rolls; 47-molten metal feeding device; 48-coating a high temperature zone; 49-a third air guide baffle; 49 a-a third cool air passage; 49 b-a third return channel;
50-finishing section; 51-finishing roller set; 52-rolling roller sets;
60-winding mechanism.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to limit the invention, so that those skilled in the art may better understand the invention and practice it.
Example 1
As shown in fig. 1, a schematic diagram of a first solution apparatus suitable for use in embodiment 1 of the liquid metal-based composite metal strip production method of the present invention is shown. The liquid metal-based composite metal strip production equipment comprises:
An unreeling mechanism 10 for unreeling the strip 1;
a coating station for coating at least one side of the strip 1 with a layer 3 of liquid metal of metallic material. The coating section of the embodiment is internally provided with a diffuse reflection surface 21 and a spraying device 22, the spraying device 22 is used for spraying liquid metal to the diffuse reflection surface, the diffuse reflection surface 22 is used for diffusely reflecting the liquid metal, and the diffusely reflected liquid metal is sprayed on the side surface of the strip material 1 to form a liquid metal layer. In this embodiment, the liquid metal layer is sprayed on both sides of the strip 1, however, the liquid metal layer may be sprayed on only one side of the strip 1, which will not be described again.
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, thus obtaining a composite metal strip; specifically, the cooling device cools the liquid metal layer prepared by the coating section according to a set temperature-time control line.
And a winding mechanism 60 for winding the obtained composite metal strip 2.
Further, the liquid metal-based composite metal strip production apparatus of the present embodiment further includes a thickness control device for controlling the thickness of the liquid metal layer. The thickness control device of this embodiment includes a thickness control roller group 23, and the thickness control roller group 23 includes thickness control rollers respectively located on both sides of the strip. The feed side of the thickness control roller group 23 of the present embodiment is provided as a dope high temperature zone 20 for keeping the liquid metal in a liquid state and fluidity; the cooling device is arranged on the discharge side of the thickness control roller set 23, i.e. the cooling device is arranged on the discharge side of the thickness control roller set 23 and is provided with a cooling zone 30 for cooling and shaping the liquid metal.
Further, the cooling device of the present 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 31, a first cold air channel 32 facing the discharging side blowing cooling medium of the thickness control roller set 23 is disposed on the outer side of the first air guiding partition 31 opposite to the strip, and a first backflow channel 33 for backflow of the cooling medium is formed between the first air guiding partition 31 and the strip 1. The cooling medium is directly blown to the discharging side of the thickness control roller set 23, so that the liquid metal can be immediately cooled and shaped after passing through the thickness control roller set 23, and the uneven thickness of the metal material layer caused by the good 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 makes the liquid metal be coated on the strip material 1 after atomizing the liquid metal into water drops, namely, the diffuse reflection surface 21 is rugged to realize diffuse reflection of the liquid metal, and after the diffusely reflected liquid metals collide with each other and atomize, the diffuse reflection surface is sprayed on the strip material 1, so that the direct sprayed liquid metal can be prevented from melting and breaking down the strip material when the temperature of the liquid metal is higher and is close to the melting point of the strip material 1.
Preferably, first edge pressing means 24 for pressing on both side edges of the strip and preventing the liquid metal from covering are provided in the coating section, the first edge pressing means 24 being for preventing the liquid metal from covering both side edges of the strip and forming blank spaces 4 on both side edges of the strip 1, as shown in fig. 4-5.
Further, the apparatus for producing a composite metal strip based on liquid metal according to the present embodiment further includes a finishing section 50 in which at least one finishing roller group 51 for rolling the composite metal strip in sequence is provided so that the thickness and the surface accuracy of the metal material layer 3 can reach the set ranges. Specifically, a finishing temperature control device for keeping the metal material layer in a temperature range convenient for finishing and forming is also arranged in the finishing working section. By arranging the finishing working section, the thickness of the metal material layer can be finished, the surface precision of the metal material layer can be controlled, and in the finishing working section, the internal stress in the metal material layer can be effectively eliminated, the plasticity of the metal material layer can be improved, the defects such as cracks in the metal material layer can be prevented, and the product quality can be improved. The present embodiment rolls the composite metal strip 2 with the rolling roll set 52 before finishing the composite metal strip 2 with the finishing roll set 51.
Further, the liquid metal-based composite metal strip production apparatus of the present embodiment further includes a thickening section for thickening the metal material layer and obtaining a thickened metal material layer. The thickening section of the embodiment is arranged between the shaping section and the finishing section, and the finishing section can be directly utilized to finish the thickened metal material layer. The thickening section is internally provided with a second edge pressing device for pressing on two side edges of the strip, and the second edge pressing device is used for forming blank spaces 4 on the two side edges of the strip. The second edge pressing device of this embodiment has the same structure as that of embodiment 1, and is shown in fig. 4 to 5.
Specifically, a powder spraying device 41 for uniformly spraying metal particles or metal powder which are the same as the metal material of the metal material layer and a roller group 42 for rolling the metal particles or the metal powder and the metal material layer into a whole to obtain a thickened metal material layer are arranged in the thickening section; the feed side of the roll stack 42 is provided with a powder spray high temperature zone 40 for enabling the metal material layer to adhere to the metal particles or metal powder and for maintaining the metal material layer and the metal particles or metal powder within a temperature range that facilitates roll forming; the discharging side of the roller group is provided with a powder spraying cooling device 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 a thickened metal material layer, the powder spraying cooling unit comprises a second air guide baffle plate 43, a second cold air channel 43a which is opposite to the discharging side blowing cooling medium of the roller group 42 is arranged on the outer side of the second air guide baffle plate 43, and a second backflow channel 43b for backflow of the cooling medium is formed between the second air guide baffle plate 43 and the strip 1, as shown in fig. 1.
Of course, a coating roll set 46 for coating a metal melt of the same material as the metal material layer to obtain a thickened metal material layer and a metal melt feeding device 47 for feeding the metal melt to the feeding side of the coating roll set 46 may be provided in the thickening section, the feeding side of the coating roll set 46 may be provided with a coating high temperature zone 48 for maintaining the metal melt in a molten state, and the discharging side of the coating roll set 46 may be provided with a coating cooling device for cooling and shaping the thickened metal material layer. The coating cooling device of this embodiment includes a coating cooling unit corresponding to the side surface of the strip 1 provided with the thickened metal material layer, the coating cooling unit includes a third air guide partition plate 49, a third cold air channel 49a facing the discharging side blowing cooling medium of the coating roller set 46 is provided on the outer side of the third air guide partition plate 49 opposite to the strip, and a third backflow channel 49b for backflow of the cooling medium is formed between the third air guide partition plate 49 and the strip 1, as shown in fig. 2. Specifically, the molten metal feeding device employs a spray gun or screw extrusion feeding device for feeding the coating roller set 46.
Of course, in some embodiments, a thickening process may not be provided, as shown in fig. 3, and will not be described again.
Through setting up the thickening workshop section, can increase the thickness of metal material layer through modes such as powder spraying rolling or solution coating, obtain the thickening metal layer, because in the coating process, guaranteed the cohesion intensity between metal material layer and the strip, consequently, after thickening the metal material layer again, can maintain the cohesion intensity between thickening metal material layer and the strip. After the metal material layer is thickened, the use requirements of use scenes such as an energy storage electrode and the like can be met.
Of course, in order to form the blank areas 4 at the two side edges of the strip 1, a composite section on the upstream side of the coating section can also be provided in the liquid metal-based composite metal strip production apparatus of the present embodiment, and a composite roller set for compositing the binding film of the non-stick metal material at the two side edges of the strip is provided in the composite section; or, the device also comprises a glue spraying section arranged on the upstream side of the coating section, wherein the glue spraying section comprises a glue spraying mechanism for spraying glue of non-stick metal materials on the edges of the two sides of the strip. At this time, on the upstream side of the winding mechanism, a take-off mechanism for taking off the wrapping film compounded on the edges of the two sides of the strip or a scraper mechanism for scraping off the colloid sprayed on the edges of the two sides of the strip is arranged, and will not be described again.
A specific embodiment of the liquid metal-based composite metal strip production method of the present embodiment will be described in detail with reference to the above-described apparatus.
The method for producing the composite metal strip based on the liquid metal comprises the following steps:
a coating step for applying a layer of liquid metal to at least one side of the strip 1.
And a shaping procedure for cooling and shaping the liquid metal layer and forming a metal material layer 3 on the strip 1, wherein the liquid metal layer prepared by the coating procedure 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 the present embodiment, the spraying device 22 sprays the liquid metal onto the diffuse reflection surface 21, so that the liquid metal is sprayed on the side surface of the strip 1 after being diffusely bounced by the diffuse reflection surface 21, and a liquid metal layer is obtained. Specifically, after the liquid metal sprayed by the spraying device 22 is diffusely reflected by the diffuse reflection surface 21, atomized water drops are formed and then sprayed on the side surface of the strip 1, that is, the diffuse reflection surface 21 is rugged 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 direct sprayed liquid metal is prevented from melting and breaking down the strip when the temperature of the liquid metal is higher and is close to the melting point of the strip 1. In this embodiment, the liquid metal layer is sprayed on both sides of the strip 1, however, the liquid metal layer may be sprayed on only one side of the strip 1, which will not be described again.
According to the method for producing the composite metal strip based on the liquid metal, a layer of liquid metal is formed on the side face of the strip, and the liquid metal is cooled and shaped to obtain a metal material layer which can be tightly combined with the surface of the strip due to the fact that the temperature of the liquid metal is high, the liquid metal is plated on the surface of the strip, and the binding force is improved; in addition, because the viscosity and the fluidity of the high-temperature liquid metal are lower, 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 like plating the liquid metal on the surface of the strip; namely, 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 binding force is better.
Further, a thickness control device is used to control the thickness of the liquid metal layer. The thickness control device of this embodiment includes a thickness control roller group 23, and the thickness control roller group 23 includes thickness control rollers respectively located on both sides of the strip material 1. The present embodiment provides a dope high temperature zone 20 for keeping the liquid metal in a liquid state and fluidity at the feed side of the thickness control roller group 23; a cooling device is arranged on the discharge side of the thickness control roller set 23, i.e. a cooling zone 30 for cooling and shaping the liquid metal is arranged on the discharge side of the thickness control roller set 23.
Further, the cooling device of the present 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 31, a first cold air channel 32 facing the discharging side blowing cooling medium of the thickness control roller set 23 is disposed on the outer side of the first air guiding partition 31 opposite to the strip, and a first backflow channel 33 for backflow of the cooling medium is formed between the first air guiding partition 31 and the strip 1. The cooling medium is directly blown to the discharging side of the thickness control roller set 23, so that the liquid metal can be immediately cooled and shaped after passing through the thickness control roller set 23, and the uneven thickness of the metal material layer caused by the good fluidity of the liquid metal is prevented, and the metal material layer with controllable and even thickness can be obtained.
Further, the strip material 1 is, but not limited to, copper strip, aluminum strip, steel strip, nickel strip, silver strip, gold strip, or a strip material of a metal material and a non-metal material, that is, the strip material 1 of the present embodiment can be used as a current collector of an energy storage electrode. Specifically, the strip may be a mesh foil, and the through holes may be arranged in an array on the strip. When the metal material layer is provided only on one side of the strip 1, the metal material layer is embedded into the mesh holes or through holes of the strip 1 to increase the binding force, and when the metal material layers are provided on both side surfaces of the strip 1, the metal material layers on both sides of the strip 1 are connected together through the mesh holes or through holes to further increase the binding force. Specifically, the metal material is not limited to lithium metal, sodium metal, potassium metal, magnesium metal, calcium metal, zinc metal, aluminum metal or silver metal; or the metal material adopts but not limited to alloy formed by proportioning at least two of metal lithium, metal sodium, metal potassium, metal magnesium, metal calcium, metal zinc, metal aluminum and metal silver. Namely, the metal material selected in the embodiment can be used as an active material of the energy storage electrode, namely, the composite metal strip in the embodiment can be used as the energy storage electrode, specifically, the strip in the embodiment adopts copper strips, and the metal material adopts metal lithium. Specifically, the temperature of the liquid metal of the metal lithium material in the embodiment is equivalent to the melting point of the metal copper, for example, the temperature range of the liquid metal lithium can be 800-1400 ℃, so that the binding force between the metal lithium and the copper strip can be effectively enhanced after the liquid metal lithium is sprayed on the copper strip.
Further, first edge pressing means 24 for pressing both side edges of the strip and preventing the liquid metal from being covered are provided in the coating process, and the first edge pressing means 24 is used for preventing the liquid metal from covering both side edges of the strip 1 and forming blank spaces 4 at both side edges of the strip, as shown in fig. 4 to 5. .
Further, the method for producing a composite metal strip based on liquid metal according to the present embodiment further includes a finishing process for sequentially finishing the composite metal strip 2 by using at least one finishing roller set 51 so that the thickness and the surface accuracy of the metal material layer reach the set ranges. The ambient temperature in the finishing process is controlled to keep the metal material layer in a temperature range convenient for finishing and forming. Through setting up the finishing process, not only can finish the thickness of metal material layer and control metal material layer's surface accuracy, in the finishing process, through controlling the temperature moreover, can effectively eliminate the internal stress in the metal material layer, improve metal material layer's plasticity, prevent defects such as crack appear in the metal material layer, improve product quality. The present embodiment rolls the composite metal strip 2 with the rolling roll set 52 before finishing the composite metal strip 2 with the finishing roll set 51.
Further, the method for producing a composite metal strip based on liquid metal according to the present embodiment is further provided with a thickening step for thickening the metal material layer and obtaining a thickened metal material layer. The thickening process of the embodiment is arranged between the shaping process and the finishing process, and the finishing process can be directly utilized to finish the thickened metal material layer. The thickening procedure is internally provided with a second edge pressing device for pressing the two side edges of the strip, and the second edge pressing device is used for forming blank spaces 4 on the two side edges of the strip. The second edge pressing device of this embodiment has the same structure as that of embodiment 1, and is shown in fig. 4 to 5.
Specifically, in the thickening step, metal particles or metal powder which are the same as the metal material are uniformly sprayed on the metal material layer by using a powder spraying device 41, and the metal particles or metal powder and the metal material layer are rolled into a whole by using a roller group 42, so that a thickened metal material layer is obtained; a powder spraying high temperature zone 40 is arranged on the feeding side of the roller group 42, and the powder spraying high temperature zone 40 is used for enabling the metal material layer to adhere to 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 roll forming; a powder spray cooling device is arranged on the discharging side of the roller 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 a thickened metal material layer, the powder spraying cooling unit comprises a second air guide baffle plate 43, a second cold air channel 43a which is opposite to the discharging side blowing cooling medium of the roller group 42 is arranged on the outer side of the second air guide baffle plate 43, and a second backflow channel 43b for backflow of the cooling medium is formed between the second air guide baffle plate 43 and the strip 1, as shown in fig. 1.
Of course, in the thickening step, the metal material layer may be coated with a molten metal of the same material as the coating roller set 46 to obtain a thickened metal material layer; a high temperature region 48 for maintaining molten metal is provided on the feed side of the paint roller set 46, and a paint cooling device for cooling and shaping the thickened metal material layer is provided on the discharge side of the paint roller set. The coating cooling device of this embodiment includes a coating cooling unit corresponding to the side surface of the strip 1 provided with the thickened metal material layer, the coating cooling unit includes a third air guide partition plate 49, a third cold air channel 49a facing the discharging side blowing cooling medium of the coating roller set 46 is provided on the outer side of the third air guide partition plate 49 opposite to the strip, and a third backflow channel 49b for backflow of the cooling medium is formed between the third air guide partition plate 49 and the strip 1, as shown in fig. 2. Specifically, the molten metal feeding device employs a spray gun or screw extrusion feeding device for feeding the coating roller set 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 employs a spray gun or screw extrusion feeding device for feeding the paint roller set.
Of course, in some embodiments, a thickening process may not be provided, as shown in fig. 3, and will not be described again.
Through setting up thickening process, can increase the thickness of metal material layer through modes such as powder spraying rolling or solution coating, obtain thickening metal layer, because in the coating process, guaranteed the cohesion intensity between metal material layer and the strip, consequently, after thickening again with the metal material layer, can maintain the cohesion intensity between thickening metal material layer and the strip. After the metal material layer is thickened, the use requirements of use scenes such as an energy storage electrode and the like can be met.
Of course, in order to form the blank area 4 on both side edges of the strip material 1, it is also possible to compound a binding film of a non-stick metal material on both side edges of the strip material 1 or spray a colloid of a non-stick metal material on both side edges of the strip material before entering the coating process. At this time, on the upstream side of the winding mechanism, a take-off mechanism for taking off the wrapping film compounded on the edges of the two sides of the strip or a scraper mechanism for scraping off the colloid sprayed on the edges of the two sides of the strip is arranged, and will not be described again.
Example 2
As shown in fig. 6, a schematic view of a first embodiment of equipment suitable for use in embodiment 2 of the liquid metal-based composite metal strip production method of the present invention is shown. The liquid metal-based composite metal strip production equipment comprises:
An unreeling mechanism 10 for unreeling the strip 1;
a coating station for coating at least one side of the strip 1 with a layer 3 of liquid metal of metallic material. The paint section of this embodiment is provided with a brush roll set 25, and the brush roll set 25 is used for uniformly brushing 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, thus obtaining a composite metal strip; specifically, the cooling device cools the liquid metal layer prepared by the coating section according to a set temperature-time control line.
A winding mechanism 50 for winding the obtained composite metal strip 2.
Other embodiments of the liquid metal-based composite metal strip production apparatus are the same as in example 1 and will not be described again.
A specific embodiment of the liquid metal-based composite metal strip production method of the present embodiment will be described in detail with reference to the above-described apparatus.
The method for producing the composite metal strip based on the liquid metal comprises the following steps:
a coating step for applying a layer of liquid metal to at least one side of the strip 1.
And a shaping procedure for cooling and shaping the liquid metal layer and forming a metal material layer 3 on the strip 1, wherein the liquid metal layer prepared by the coating procedure 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, a liquid metal layer is obtained by brushing a liquid metal on the side surface of the strip with a brush roll set. Specifically, the brush roller set 25 of this embodiment includes brush rollers respectively located at two sides of the strip 1, and the two brush rollers respectively apply the liquid metal layer on two sides of the strip 1, however, it is also possible to provide brush rollers on only one side of the strip 1, that is, only one side of the strip is applied with the liquid metal layer. The feeding mode of the brush roll is selected according to practical situations, for example, when the brush roll is positioned below the strip 1, a storage tank 25a can be arranged below the brush roll, and the brush roll is partially immersed into the liquid metal in the storage tank. If the brush roller is located above the strip 1, the spray head can be directly used for spraying the brush roller, or a feeding roller 25b parallel to the brush roller can be arranged, the gap between the feeding roller 25b and the corresponding brush roller is smaller than the radial length of the brush bristles of the brush roller, and the liquid metal is directly added between the feeding roller 25b and the brush roller to realize feeding.
According to the method for producing the composite metal strip based on the liquid metal, a layer of liquid metal is formed on the side face of the strip, and the liquid metal is cooled and shaped to obtain a metal material layer which can be tightly combined with the surface of the strip due to the fact that the temperature of the liquid metal is high, the liquid metal is plated on the surface of the strip, and the binding force is improved; in addition, because the viscosity and the fluidity of the high-temperature liquid metal are lower, 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 like plating the liquid metal on the surface of the strip; namely, 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 binding force is better.
Other embodiments of the liquid metal-based composite metal strip production method of this example are the same as in example 1, and will not be described again.
Example 3
As shown in fig. 9, a schematic view of the apparatus is provided for a first embodiment 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:
an unreeling mechanism 10 for unreeling the strip 1;
a coating station for coating at least one side of the strip 1 with a layer 3 of liquid metal of metallic material. A spraying device 26 is arranged in the coating section of the embodiment, and the spraying device 26 sprays liquid metal on the side surface of the strip 1 to form a liquid metal layer. The spraying device 26 adopts a linear direct spray nozzle or an atomization nozzle which atomizes the liquid metal and then sprays the liquid metal.
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, thus obtaining a composite metal strip; specifically, the cooling device cools the liquid metal layer prepared by the coating section according to a set temperature-time control line.
A winding mechanism 50 for winding the obtained composite metal strip 2.
Other embodiments of the liquid metal-based composite metal strip production apparatus are the same as in example 1 and will not be described again.
A specific embodiment of the liquid metal-based composite metal strip production method of the present embodiment will be described in detail with reference to the above-described apparatus.
The method for producing the composite metal strip based on the liquid metal comprises the following steps:
a coating step for applying a layer of liquid metal to at least one side of the strip 1.
And a shaping procedure for cooling and shaping the liquid metal layer and forming a metal material layer 3 on the strip 1, wherein the liquid metal layer prepared by the coating procedure 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 on the side surface of the strip by using a spraying device to obtain the liquid metal. The spraying device 26 adopts a linear direct spray nozzle or an atomization nozzle which atomizes the liquid metal and then sprays the liquid metal. When the temperature of the liquid metal is substantially lower than the melting point of the strip 1, a linear direct spray nozzle may be used to spray the liquid metal directly onto the surface of the strip 1. When the temperature of the liquid metal is relatively close to the melting point of the strip 1, the liquid metal is sprayed on the surface of the strip 1 by adopting an atomization nozzle, so that the liquid metal is prevented from melting and breaking down the strip. In addition, according to different use requirements, the liquid metal layer can be sprayed on only one side of the strip 1, or can be sprayed on both sides of the strip 1 at the same time, and in this embodiment, the spraying devices 26 are respectively arranged on both sides of the strip 1, so that the liquid metal layer can be sprayed on both sides of the strip 1, which is not described again.
According to the method for producing the composite metal strip based on the liquid metal, a layer of liquid metal is formed on the side face of the strip, and the liquid metal is cooled and shaped to obtain a metal material layer which can be tightly combined with the surface of the strip due to the fact that the temperature of the liquid metal is high, the liquid metal is plated on the surface of the strip, and the binding force is improved; in addition, because the viscosity and the fluidity of the high-temperature liquid metal are lower, 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 like plating the liquid metal on the surface of the strip; namely, 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 binding force is better.
Other embodiments of the liquid metal-based composite metal strip production method of this example are the same as in example 1, and will not be described again.
Example 4
As shown in fig. 12, there is a schematic view of the apparatus principle of the first embodiment of the liquid metal-based composite metal strip production method example 3 suitable for the present invention. The liquid metal-based composite metal strip production equipment comprises:
An unreeling mechanism 10 for unreeling the strip 1;
a coating station for coating at least one side of the strip 1 with a layer 3 of liquid metal of metallic material. A belt roll set 27 and a screw feeding device 28 for feeding the belt roll set are arranged in the coating section of the embodiment, the belt roll set 27 comprises belt rolls, and the belt rolls coat liquid metal on the side surface of the strip 1 to form a liquid metal layer. The set of strip rolls 27 may be coated with a liquid metal layer on only one side of the strip 1, or may be coated with liquid metal layers on both sides of the strip 1 at the same time, and will not be described again.
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, thus obtaining a composite metal strip; specifically, the cooling device cools the liquid metal layer prepared by the coating section according to a set temperature-time control line.
A winding mechanism 50 for winding the obtained composite metal strip 2.
Other embodiments of the liquid metal-based composite metal strip production apparatus are the same as in example 1 and will not be described again.
A specific embodiment of the liquid metal-based composite metal strip production method of the present embodiment will be described in detail with reference to the above-described apparatus.
The method for producing the composite metal strip based on the liquid metal comprises the following steps:
a coating step for applying a layer of liquid metal to at least one side of the strip 1.
And a shaping procedure for cooling and shaping the liquid metal layer and forming a metal material layer 3 on the strip 1, wherein the liquid metal layer prepared by the coating procedure 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 the present embodiment, a liquid metal coating is applied to the side of the strip 1 by the strip roller 27 to obtain a liquid metal layer. The present embodiment utilizes a screw feeder 28 to feed a set of strip rolls 27 comprising strip rolls that apply liquid metal to the sides of the strip 1 to form a layer of liquid metal. The set of strip rolls 27 may be coated with a liquid metal layer on only one side of the strip 1, or may be coated with liquid metal layers on both sides of the strip 1 at the same time, and will not be described again.
According to the method for producing the composite metal strip based on the liquid metal, a layer of liquid metal is formed on the side face of the strip, and the liquid metal is cooled and shaped to obtain a metal material layer which can be tightly combined with the surface of the strip due to the fact that the temperature of the liquid metal is high, the liquid metal is plated on the surface of the strip, and the binding force is improved; in addition, because the viscosity and the fluidity of the high-temperature liquid metal are lower, 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 like plating the liquid metal on the surface of the strip; namely, 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 binding force is better.
Other embodiments of the liquid metal-based composite metal strip production method of this example are the same as in example 1, and will not be described again.
Note that: as used herein, "liquid metal" refers to molten metal having fluidity meeting set requirements or molten metal having a temperature exceeding the boiling point of the metal material, and will not be described again.
In the process of producing the composite metal belt, according to different choices of materials of the belt material and the metal material used for forming the metal material layer, corresponding atmosphere environments and corresponding temperature and dryness environments are needed, and the environment settings can be adjusted and selected according to the requirements of the belt material and the metal material, so that technical barriers do not exist for the person skilled in the art, and the description is not needed.
The above-described embodiments are merely preferred embodiments for fully explaining the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present invention, and are intended to be within the scope of the present invention. The protection scope of the invention is subject to the claims.

Claims (13)

1. A method for producing a composite metal strip based on liquid metal, characterized in that: comprising the following steps:
A coating process for coating a liquid metal layer on both side surfaces of the strip;
a shaping procedure for cooling and shaping the liquid metal layer and forming a metal material layer on the strip to obtain a composite metal strip;
the method further comprises a finishing procedure, wherein the composite metal belt is sequentially finished by at least one finishing roller set, so that the thickness and the surface precision of the metal material layer reach a set range; controlling the environmental temperature in the finishing process to ensure that the metal material layer is kept in a temperature range convenient for finishing and forming;
a thickening step for thickening the metal material layer and obtaining a thickened metal material layer is arranged between the shaping step and the finishing step;
in the thickening procedure, metal particles or metal powder which are the same as the metal material layer are uniformly sprayed on the metal material layer by using a powder spraying device, and the metal particles or the metal powder and the metal material layer are rolled into a whole by using a roller group, so that the thickened metal material layer is obtained; a powder spraying high-temperature area is arranged on the feeding side of the roller group, and the powder spraying high-temperature area is used for enabling the metal material layer to adhere to 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; a powder spraying cooling device is arranged on the discharging side of the roller group and is used for cooling and shaping the thickened metal material layer;
The powder spraying cooling device comprises a powder spraying cooling unit which is arranged corresponding to the side surface of the strip provided with the thickened metal material layer, the powder spraying cooling unit comprises a second air guide baffle, a second cold air channel which is opposite to the outer side of the strip and used for blowing cooling medium on the discharging side of the roller group is arranged on the second air guide baffle, and a second backflow channel for backflow of the cooling medium is formed between the second air guide baffle and the strip;
or, in the thickening procedure, coating the metal material layer with a metal melt which is the same as the metal material layer by using a coating roller set to obtain the thickened metal material layer; a coating high-temperature area for keeping the molten metal in a molten state is arranged on the feeding side of the coating roller set, and a coating cooling device for cooling and shaping the thickened metal material layer is arranged on the discharging side of the coating roller set;
the coating cooling device comprises a coating cooling unit which is arranged corresponding to the side surface of the strip provided with the thickened metal material layer, the coating cooling unit comprises a third air guide baffle, a third cold air channel which is opposite to the discharging side blowing cooling medium of the coating roller set is arranged on the outer side of the third air guide baffle, and a third backflow channel for backflow of the cooling medium is formed between the third air guide baffle and the strip;
Controlling the thickness of the liquid metal layer by adopting a thickness control device;
the thickness control device comprises a thickness control roller set, wherein the thickness control roller set comprises thickness control rollers respectively positioned at two sides of the strip;
a coating high-temperature area for keeping liquid state and fluidity of the liquid metal is arranged on the feeding side of the thickness control roller set; a cooling device is arranged on the discharging side of the thickness control roller group;
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 baffle, a first cold air channel which is opposite to the discharging side blowing cooling medium of the thickness control roller set is arranged on the outer side of the first air guide baffle, opposite to the strip, and a first backflow channel for backflow of the cooling medium is formed between the first air guide baffle and the strip.
2. The method for producing a composite metal strip based on liquid metal according to claim 1, characterized in that:
in the coating process, 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 being diffusely reflected by the diffuse reflection surface, and the liquid metal layer is obtained; or alternatively, the first and second heat exchangers may be,
in the coating process, a brushing roller set is utilized to brush liquid metal on the side surface of the strip material to obtain the liquid metal layer; or alternatively, the first and second heat exchangers may be,
In the coating process, spraying liquid metal on the side surface of the strip by using a spraying device to obtain the liquid metal layer; or in the coating process, a liquid metal coating is coated on the side surface of the strip by using a strip roller, so as to obtain the liquid metal layer.
3. The method for producing a composite metal strip based on liquid metal according to claim 1, characterized in that: and the shaping procedure is to cool the liquid metal layer prepared by the coating procedure by using a cooling device according to a set temperature-time control line.
4. The method for producing a composite metal strip based on liquid metal according to claim 2, characterized in that: the liquid metal sprayed by the spraying device is sprayed on the side surface of the strip after being diffusely reflected by the diffuse reflection surface to form atomized water drops.
5. The method for producing a composite metal strip based on liquid metal according to claim 2, characterized in that: the spraying device adopts a linear spray head to directly spray the liquid metal on the side surface of the strip, or the spraying device sprays the atomized liquid metal on the side surface of the strip after atomizing the liquid metal.
6. A method for producing a liquid metal based composite metal strip according to any one of claims 1-3, characterized in that: the strip material adopts copper strips, aluminum strips, steel strips, nickel strips, silver strips, gold strips or strips formed by compounding metal materials and nonmetal materials.
7. The method for producing a composite metal strip based on liquid metal according to claim 6, characterized in that: the strip material adopts a net-shaped foil material or through holes are arranged on the strip material in an array manner.
8. A method for producing a liquid metal based composite metal strip according to any one of claims 1-3, characterized in that: the metal material for forming the metal material layer adopts metal lithium, metal sodium, metal potassium, metal magnesium, metal calcium, metal zinc, metal aluminum or metal silver; or the metal material for forming the metal material layer is an alloy formed by proportioning at least two of metal lithium, metal sodium, metal potassium, metal magnesium, metal calcium, metal zinc, metal aluminum and metal silver.
9. A method for producing a liquid metal based composite metal strip according to any one of claims 1-3, characterized in that: the coating process is internally provided with a first edge pressing device used for pressing two side edges of the strip and preventing the liquid metal from covering, and the first edge pressing device is used for preventing the liquid metal from covering the two side edges of the strip and forming blank spaces on the two side edges of the strip.
10. The method for producing a composite metal strip based on liquid metal according to claim 1, characterized in that: and arranging a molten metal feeding device on the feeding side of the coating roller set, wherein the molten metal feeding device adopts a spray gun or a screw extrusion feeding device for feeding the coating roller set.
11. The method for producing a composite metal strip based on liquid metal according to claim 1, characterized in that: and a second edge pressing device pressed on two side edges of the strip is arranged in the thickening procedure and is used for forming blank spaces on the two side edges of the strip.
12. A method for producing a liquid metal based composite metal strip according to any one of claims 1-3, characterized in that: before entering the coating process, the two side edges of the strip material are compounded with edge-wrapping films which are not adhered with the metal material or the two side edges of the strip material are sprayed with colloid which is not adhered with the metal material.
13. The method for producing a composite metal strip based on liquid metal according to claim 12, characterized in that: before the composite metal belt is rolled, the edge-covering films compounded on the two side edges of the belt are uncovered or the colloid sprayed on the two side edges of the belt is scraped off and then rolled.
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