CN117568669A - Creep-resistant copper-aluminum composite board for lithium battery negative electrode collecting column and manufacturing method thereof - Google Patents

Creep-resistant copper-aluminum composite board for lithium battery negative electrode collecting column and manufacturing method thereof Download PDF

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Publication number
CN117568669A
CN117568669A CN202410078233.7A CN202410078233A CN117568669A CN 117568669 A CN117568669 A CN 117568669A CN 202410078233 A CN202410078233 A CN 202410078233A CN 117568669 A CN117568669 A CN 117568669A
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copper
creep
composite board
aluminum composite
negative electrode
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张全成
袁婷
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Jiangsu Changaluminium Group Co ltd
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Jiangsu Changaluminium Group Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/562—Terminals characterised by the material
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/026—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/12—Alloys based on aluminium with copper as the next major constituent
    • C22C21/14—Alloys based on aluminium with copper as the next major constituent with silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/12—Alloys based on aluminium with copper as the next major constituent
    • C22C21/16—Alloys based on aluminium with copper as the next major constituent with magnesium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/057—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with copper as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C6/00—Coating by casting molten material on the substrate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
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  • Physics & Mathematics (AREA)
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  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Cell Electrode Carriers And Collectors (AREA)

Abstract

The invention relates to the technical field of aluminum alloy materials, in particular to a creep-resistant copper-aluminum composite board for a lithium battery negative electrode collector and a manufacturing method thereof. The method comprises the steps of smelting aluminum alloy, and introducing a copper plate strip into a casting and rolling machine after surface treatment and preheating treatment; and continuously casting the liquid aluminum alloy on the copper plate strip in a triangular area formed by a casting nozzle and a casting roller to obtain a copper-aluminum composite plate strip blank, and then carrying out cold rolling, intermediate annealing, finish rolling and finished product annealing, slitting, and carrying out primary regression aging treatment after slitting to obtain the material for the lithium ion battery negative electrode collecting post. The invention adopts the compound continuous casting and rolling process of liquid aluminum and solid copper to produce, thereby greatly saving the production cost, simplifying the production flow and improving the production efficiency. During casting and rolling, the copper-aluminum interface produces violent plastic deformation due to the rolling force, so that copper and aluminum grains can be thinned simultaneously, a large number of lattice defects such as dislocation, grain boundary and subgrain boundary are produced, and the metallurgical bonding strength is improved.

Description

Creep-resistant copper-aluminum composite board for lithium battery negative electrode collecting column and manufacturing method thereof
Technical Field
The invention relates to the technical field of aluminum alloy materials, in particular to a creep-resistant copper-aluminum composite board for a lithium battery negative electrode collector and a manufacturing method thereof.
Background
The negative pole collecting post of the lithium ion power battery of the new energy automobile adopts copper to connect with the electrode lug of the battery cell at present, the bus connected with the outside is aluminum, and the efficiency and the yield are lower because the welding difficulty of copper and aluminum is high and the friction stir welding or mechanical connection mode is adopted at present. And copper and aluminum are easier to form intermetallic compounds, and the common welding mode is adopted, so that the reaction layer is thick, is hard and brittle, greatly reduces the bonding strength, is easy to separate in the service process, causes large contact resistance and high heat generation, and influences the normal use of the battery.
The existing negative electrode collecting post adopts 1060 aluminum alloy, and the alloy has low hardness. If a mechanical connection mode is adopted at the place where the bus is connected, aluminum alloy creep easily occurs for a long time, so that the contact resistance is large, the temperature is high, the normal operation of the battery is influenced, and the method becomes a dangerous link in long-term service.
In order to solve the problems, the invention provides a creep-resistant copper-aluminum composite board for a lithium battery negative electrode collecting post and a manufacturing method thereof, and the creep-resistant copper-aluminum composite board is used for improving the interface bonding strength and creep resistance of a creep-resistant material for a battery connector.
Disclosure of Invention
The invention aims to provide a creep-resistant copper-aluminum composite board for a lithium battery negative electrode collecting post and a manufacturing method thereof, so as to solve the problems in the prior art.
In order to solve the technical problems, the invention provides the following technical scheme: creep-resistant copper-aluminum composite board for lithium battery cathode collecting column and manufacturing method thereof.
The creep-resistant copper-aluminum composite board for the lithium battery cathode collecting column is a copper plate with liquid aluminum alloy cast on one side.
More preferably, the liquid aluminum alloy comprises the following components in percentage by mass: mg:0.2-0.9%, si:0.1-0.6%, fe:0.01-0.5%, mn:0.05-1.3%, cu:0.05-0.5%, ti:0-0.01%, re:0.005-0.015%, and the balance of Al and unavoidable impurities.
More preferably, re is one or more of La and Ce.
More preferably, the copper plate is a T2 copper plate, and the thickness of the copper plate is 1-6mm; the thickness of the copper-aluminum composite board is 4-12mm.
The manufacturing method of the creep-resistant copper-aluminum composite board for the lithium battery cathode collecting column comprises the following steps:
step one: taking Mg, si, fe, mn, cu, ti, re, al, smelting, standing, degassing and filtering to obtain a liquid aluminum alloy;
step two: taking a copper plate, polishing and cleaning, and then preheating to 150-450 ℃ to obtain a solid pretreated copper plate; directly casting liquid aluminum alloy on the surface of the pretreated copper plate, and carrying out continuous casting and rolling treatment to obtain a plate ingot; the pretreatment of the T2 copper plate is mechanical polishing, the aim is to remove a surface oxide layer, adjust the surface roughness, and the pretreatment can be performed on line or off line, the preheating treatment is performed before the copper strip is led in, the heat treatment is beneficial to interface bonding, the mechanical polishing can be performed through abrasive belt or shot blasting, and the surface oxide film is removed;
step three: the slab ingot is placed in a nitrogen atmosphere for intermediate annealing, and then final annealing is carried out, so that a finished slab ingot is obtained;
step four: and cutting the finished product plate ingot, and then carrying out solid solution, cooling and aging treatment to obtain the creep-resistant copper-aluminum composite plate.
More preferably, in the first step, the smelting temperature is 720-800 ℃, the standing temperature is 710-780 ℃ and the degassing temperature is 700-760 ℃.
More optimally, in the second step, the continuous casting temperature is 680-720 ℃ during continuous casting and rolling treatment; casting speed is 0.1-1.5 m/min; the water inlet temperature of the cooling water is 10-25 ℃.
More optimally, in the third step, the intermediate annealing temperature is 220-350 ℃, and the heat preservation time is 2-16 hours; the final annealing temperature is 260-400 ℃ and the heat preservation time is 4-12 hours.
More optimally, in the fourth step, the solid solution temperature is 420-550 ℃, the atmosphere is nitrogen, and the heat preservation time is 1-3 hours.
More optimally, in the fourth step, the cooling mode is aerosol cooling under the nitrogen environment, the cooling intensity is 40-50 ℃ per minute, the aging temperature after cooling is 150-250 ℃, and the heat preservation time is 1-5 hours.
Compared with the prior art, the invention has the following beneficial effects:
(1) The creep-resistant copper-aluminum composite board for the lithium battery cathode collecting column is prepared from high-temperature liquid aluminum alloy and a solid T2 copper plate through continuous casting and rolling. The invention prepares the aluminum alloy component with aging strengthening effect, and adds the aluminum alloy of Mg, si, mn and other elements as the aluminum matrix, so that the alloy has higher strength, and has the advantages of good corrosion resistance, good formability, good fatigue resistance and the like.
The rare earth refiner Re is adopted to carry out aluminum alloy modification treatment to replace an aluminum titanium boron wire refiner, and because Ti has great negative influence on conductivity, the rare earth refiner has certain benefit on the improvement of the conductivity of the collecting column.
The copper plate is mechanically polished by milling the surface and preheated at 150-450 ℃ before continuous casting and rolling, the mechanical polishing can increase the surface roughness, the surface area is greatly increased, the copper and aluminum are promoted to be rapidly infiltrated at high temperature, and metallurgical bonding is formed; the preheating treatment can reduce cold and hot impact in the copper-aluminum contact process, obviously reduce internal stress and improve bonding strength.
The metallurgical bonding between copper and aluminum is formed in the continuous casting and rolling process, and mechanical bonding or friction welding bonding in the later use process is replaced, so that the problems of unstable bonding, easy failure, low efficiency and the like are solved from the source, the conductive effect of the power battery is further improved, and the service life is prolonged.
The invention carries out primary regression aging treatment on the cut finished product thickness slab ingot, at the moment, tiny Mg can be formed in the aluminum alloy 2 The Si aging strengthening phase is beneficial to inhibiting creep, ensuring the connecting effect of the connecting piece and prolonging the service life.
(2) The invention smelts and refines the aluminum alloy; meanwhile, the T2 copper plate strip is guided into a casting and rolling machine after surface treatment and preheating treatment; and continuously casting the liquid aluminum alloy on a copper plate belt, then carrying out cold rolling, intermediate annealing, finish rolling and finished product annealing, then cutting, and carrying out primary regression aging treatment after cutting to obtain the material for the lithium ion battery negative electrode collecting post. The interface bonding strength of the copper-aluminum composite material is more than 20N/m, the 300-hour deformation under the action of 100MPa constant load stress is less than 0.5 percent, and 10 percent 5 The hourly deformation is less than 1%. According to the invention, the composite manufacturing is carried out by adopting an ageing reinforced aluminum alloy component design and a continuous casting and rolling process method, the strength of the aluminum alloy is improved by adopting regression ageing treatment, and the interface bonding strength and creep resistance of the copper-aluminum composite material are effectively improved.
The composite continuous casting and rolling process of liquid aluminum and solid copper is adopted for production, so that the production cost is greatly saved, the production flow is simplified, and the production efficiency is improved. The copper-aluminum interface position generates severe plastic deformation due to the rolling acting force in the casting and rolling process, copper and aluminum grains can be thinned simultaneously, a large number of lattice defects such as dislocation, grain boundary and subgrain boundary are generated, and atomic diffusion in the later heat treatment process is promoted, so that the metallurgical bonding strength is improved.
The technology can use more recovered metals, can greatly reduce carbon indexes compared with the existing pure aluminum alloy design, and has good supporting effect on double-carbon work.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of the metallographic structure of the interface of the copper-aluminum composite panel of example 1 of the present invention;
FIG. 2 is a schematic diagram of the structure of a scanning electron microscope of the interface of the copper-aluminum composite board in embodiment 1 of the present invention;
FIG. 3 is a schematic structural view of a copper-aluminum composite panel according to example 1 of the present invention;
reference numerals: 1-copper plate, 2-liquid aluminum alloy, 3-copper-aluminum composite plate and 4-continuous casting roller.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1: the manufacturing method of the creep-resistant copper-aluminum composite board for the lithium battery cathode collecting column comprises the following steps:
step one: mg, si, fe, mn, cu, la, ce, al is taken and smelted and refined to obtain liquid aluminum alloy;
the liquid aluminum alloy comprises the following components in percentage by mass: mg:0.87%, si:0.47%, fe:0.43%, mn:1.05%, cu:0.35%, la:0.007%, ce:0.007%, the balance of Al and unavoidable impurities;
step two: taking a T2 copper plate 1, polishing and cleaning, and then preheating to 250 ℃ to obtain a solid pretreated T2 copper plate;
directly casting the liquid aluminum alloy 2 on the surface of the pretreated T2 copper plate, and continuously casting and rolling by using a continuous casting roller 4, wherein the casting and rolling temperature is 715 ℃, the cooling water inlet temperature is 12 ℃, the casting and rolling speed is 0.3m/min, the thickness of a casting and rolling plate is 11.2mm, and at the moment, the thickness of the copper plate is 4.3mm;
step three: the plate ingot after cold rough rolling enters a nitrogen furnace for intermediate annealing, the temperature is 230 ℃, and the heat preservation time is 3 hours; the thickness of the finished product after cold finish rolling is 3.0mm, the temperature for finished product annealing is 340 ℃, and the heat preservation time is 8 hours, so that a finished product thickness slab ingot is obtained;
step four: and cutting the plate ingot with the finished thickness, and then carrying out primary regression aging treatment, wherein the solid solution temperature is 470 ℃, the heat preservation time is 3 hours, and carrying out aerosol cooling in a nitrogen environment, the cooling strength is 50 ℃ per minute, the aging temperature is 180 ℃, and the heat preservation time is 4 hours, so as to obtain the creep-resistant copper-aluminum composite plate 3.
Example 2: the manufacturing method of the creep-resistant copper-aluminum composite board for the lithium battery cathode collecting column comprises the following steps:
step one: mg, si, fe, mn, cu, ti, la, ce, al is taken and smelted and refined to obtain liquid aluminum alloy;
the liquid aluminum alloy comprises the following components in percentage by mass: mg:0.45%, si:0.27%, fe:0.15%, mn:0.20%, cu:0.13%, ti:0.008%; la:0.004%, ce:0.004%, the balance of Al and unavoidable impurities;
step two:
taking a T2 copper plate, polishing and cleaning, and then preheating to 440 ℃ to obtain a solid pretreated T2 copper plate;
directly casting liquid aluminum alloy on the surface of the pretreated T2 copper plate for continuous casting and rolling, wherein the casting and rolling temperature is 695 ℃, the cooling water inlet temperature is 24 ℃, and the casting and rolling speed is 1.3m/min; the thickness of the cast-rolled plate is 8.0mm; at this time, the thickness of the copper plate was 3.1mm;
the plate ingot after cold rough rolling enters a nitrogen furnace for intermediate annealing, the temperature is 280 ℃, and the heat preservation time is 4 hours; the thickness of the finished product after cold finish rolling is 3.0mm, the temperature for finished product annealing is 290 ℃, and the heat preservation time is 12 hours, so that a finished product thickness slab ingot is obtained;
and cutting the plate ingot with the finished thickness, and then carrying out primary regression aging treatment, wherein the solid solution temperature is 450 ℃, the heat preservation time is 2 hours, and carrying out aerosol cooling in a nitrogen environment, the cooling strength is 50 ℃ per minute, the aging temperature is 190 ℃, and the heat preservation time is 2 hours, so as to obtain the creep-resistant copper-aluminum composite plate.
Example 3: the manufacturing method of the creep-resistant copper-aluminum composite board for the lithium battery cathode collecting column comprises the following steps:
step one: mg, si, fe, mn, cu, ti, la, ce, al is taken and smelted and refined to obtain liquid aluminum alloy;
the liquid aluminum alloy comprises the following components in percentage by mass: mg:0.62%, si:0.39%, fe:0.21%, mn:0.38%, cu:0.35%, ti:0.005%, la:0.005%, ce:0.005% of Al and the balance of unavoidable impurities;
step two:
taking a T2 copper plate, polishing and cleaning, and then preheating to 250 ℃ to obtain a solid pretreated T2 copper plate;
directly casting liquid aluminum alloy on the surface of the pretreated T2 copper plate for continuous casting and rolling, wherein the casting and rolling temperature is 690 ℃, the casting and rolling speed is 0.81m/min, and the thickness of a casting and rolling plate is 6.0mm; at this time, the thickness of the copper plate was 1.7mm;
the plate ingot after cold rough rolling enters a nitrogen furnace for intermediate annealing at the temperature of 350 ℃ for 8 hours; the thickness of the finished product after cold finish rolling is 2.0mm, the temperature for finished product annealing is 220 ℃, and the heat preservation time is 3 hours, so that a finished product thickness slab ingot is obtained;
and cutting the plate ingot with the finished thickness, and then carrying out primary regression aging treatment, wherein the solid solution temperature is 480 ℃, the heat preservation time is 1 hour, and carrying out aerosol cooling in a nitrogen environment, the cooling strength is 50 ℃ per minute, the aging temperature is 210 ℃, and the heat preservation time is 2 hours, so as to obtain the creep-resistant copper-aluminum composite plate.
Experiment:
the creep-resistant copper-aluminum composite boards prepared in examples 1 to 3 are subjected to performance test, and the interface bonding strength and the creep resistance under 100MPa constant load stress are tested according to the standard GJB446-88 adhesive 90 DEG peel strength test method (metal to metal) and the GB/T2039-2012 metal material uniaxial tensile creep test method, respectively, and the obtained data are shown in the following table:
conclusion: as can be seen from the data on the table, the aluminum alloy is smelted, and the copper plate strip is led into a casting and rolling machine after surface treatment and preheating treatment; and continuously casting the liquid aluminum alloy on the copper plate strip in a triangular area formed by a casting nozzle and a casting roller to obtain a copper-aluminum composite plate strip blank, and carrying out regressive aging treatment after cold rolling, intermediate annealing, finish rolling and finished product annealing to obtain the material for the lithium ion battery cathode collecting post. During casting and rolling, the copper-aluminum interface produces violent plastic deformation due to the rolling force, so that copper and aluminum grains can be thinned simultaneously, a large number of lattice defects such as dislocation, grain boundary and subgrain boundary are produced, and the metallurgical bonding strength is improved. The interface bonding strength of the copper-aluminum composite board prepared by the method provided by the invention is more than 20N/m, and the deformation of the copper-aluminum composite board under the action of 100MPa constant load stress for 300 hours is less than 0.5 percent and 10 percent 5 The deformation per hour is less than 1%, and the alloy has higher strength and creep resistance.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a lithium cell negative pole is creep-resistant copper aluminium composite board for gathering post which characterized in that: the copper-aluminum composite board (3) is a copper plate (1) with a liquid aluminum alloy (2) cast on one side.
2. The creep-resistant copper-aluminum composite board for a lithium battery negative electrode collector according to claim 1, wherein the creep-resistant copper-aluminum composite board is characterized in that: the liquid aluminum alloy (2) comprises the following components in percentage by mass: mg:0.2-0.9%, si:0.1-0.6%, fe:0.01-0.5%, mn:0.05-1.3%, cu:0.05-0.5%, ti:0-0.01%, re:0.005-0.015%, and the balance of Al and unavoidable impurities.
3. The creep-resistant copper-aluminum composite board for a lithium battery negative electrode collector according to claim 2, wherein the creep-resistant copper-aluminum composite board is characterized in that: re is one or more of La and Ce.
4. The creep-resistant copper-aluminum composite board for a lithium battery negative electrode collector according to claim 1, wherein the creep-resistant copper-aluminum composite board is characterized in that: the copper plate (1) is a T2 copper plate, and the thickness of the copper plate (1) is 1-6mm; the thickness of the copper-aluminum composite board (3) is 4-12mm.
5. A manufacturing method of creep-resistant copper-aluminum composite board for lithium battery cathode collecting columns is characterized by comprising the following steps: the method comprises the following steps:
step one: taking Mg, si, fe, mn, cu, ti, re, al, smelting, standing, degassing and filtering to obtain a liquid aluminum alloy (2);
step two: taking a copper plate, polishing and cleaning, and then preheating to 150-450 ℃ to obtain a solid pretreated copper plate; directly casting liquid aluminum alloy (2) on the surface of the pretreated copper plate, and carrying out continuous casting and rolling treatment to obtain a plate ingot;
step three: the slab ingot is placed in a nitrogen atmosphere for intermediate annealing, and then final annealing is carried out, so that a finished slab ingot is obtained;
step four: and cutting the finished product plate ingot, and then carrying out solid solution, cooling and aging treatment to obtain the creep-resistant copper-aluminum composite plate (3).
6. The method for manufacturing the creep-resistant copper-aluminum composite board for the lithium battery negative electrode collector according to claim 5, wherein the method comprises the following steps: in the first step, the smelting temperature is 720-800 ℃, the standing temperature is 710-780 ℃ and the degassing temperature is 700-760 ℃.
7. The method for manufacturing the creep-resistant copper-aluminum composite board for the lithium battery negative electrode collector according to claim 5, wherein the method comprises the following steps: in the second step, during continuous casting and rolling treatment, the continuous casting temperature is 680-720 ℃; casting speed is 0.1-1.5 m/min; the water inlet temperature of the cooling water is 10-25 ℃.
8. The method for manufacturing the creep-resistant copper-aluminum composite board for the lithium battery negative electrode collector according to claim 5, wherein the method comprises the following steps: in the third step, the intermediate annealing temperature is 220-350 ℃, and the heat preservation time is 2-16 hours; the final annealing temperature is 260-400 ℃ and the heat preservation time is 4-12 hours.
9. The method for manufacturing the creep-resistant copper-aluminum composite board for the lithium battery negative electrode collector according to claim 5, wherein the method comprises the following steps: in the fourth step, the solid solution temperature is 420-550 ℃, the atmosphere is nitrogen, and the heat preservation time is 1-3 hours.
10. The method for manufacturing the creep-resistant copper-aluminum composite board for the lithium battery negative electrode collector according to claim 5, wherein the method comprises the following steps: and step four, cooling the aerosol in a nitrogen environment, wherein the cooling strength is 40-50 ℃ per minute, the aging temperature after cooling is 150-250 ℃, and the heat preservation time is 1-5 hours.
CN202410078233.7A 2024-01-19 2024-01-19 Creep-resistant copper-aluminum composite board for lithium battery negative electrode collecting column and manufacturing method thereof Pending CN117568669A (en)

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CN108220692A (en) * 2017-12-12 2018-06-29 江苏大学 The preparation method of drawing aluminum alloy plate materials is thinned in a kind of high intensity
CN108486430A (en) * 2018-05-25 2018-09-04 宁波宝陆汽车部件有限公司 High intensity heat conduction fuel tank aluminium alloy plate production technology
CN110340173A (en) * 2019-07-01 2019-10-18 东北轻合金有限责任公司 A kind of preparation method of 6061 aluminium alloy and the laminated composite plate of T2 copper
CN110340317A (en) * 2019-08-09 2019-10-18 河南科技大学 A kind of asynchronous casting-rolling method preparing Ultra-fine grain copper aluminium composite sheet band
CN113414237A (en) * 2021-06-21 2021-09-21 西安理工大学 Method for preparing high-performance Al-Cu-Al composite material by rolling

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103060624A (en) * 2013-01-14 2013-04-24 洛阳铜一金属材料发展有限公司 Aluminum substrate material of copper-aluminum composite plate strip, copper-aluminum composite plate strip and processing method of copper-aluminum composite plate strip
CN108220692A (en) * 2017-12-12 2018-06-29 江苏大学 The preparation method of drawing aluminum alloy plate materials is thinned in a kind of high intensity
CN108486430A (en) * 2018-05-25 2018-09-04 宁波宝陆汽车部件有限公司 High intensity heat conduction fuel tank aluminium alloy plate production technology
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