CN111254320B - High-strength material for flexible connection of new energy power battery and manufacturing method thereof - Google Patents

High-strength material for flexible connection of new energy power battery and manufacturing method thereof Download PDF

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Publication number
CN111254320B
CN111254320B CN202010147368.6A CN202010147368A CN111254320B CN 111254320 B CN111254320 B CN 111254320B CN 202010147368 A CN202010147368 A CN 202010147368A CN 111254320 B CN111254320 B CN 111254320B
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rolling
temperature
annealing
finished product
new energy
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CN111254320A (en
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田国建
李高林
张明成
朱江文
吴保剑
曾元
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Jiangsu Dingsheng New Energy Materials Co ltd
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Jiangsu Dingsheng New Energy Materials Co ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/502Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The invention belongs to the technical field of aluminum foil rolling manufacturing, and discloses a high-strength material for flexible connection of a new energy power battery and a manufacturing method thereof. The composite material comprises the following components in percentage by mass: 0.20-0.30% of Si, 0.40-0.60% of Fe, 0.08-0.12% of Cu, 1.05-1.20% of Mn, less than or equal to 0.05% of Zn, less than or equal to 0.03% of Ti and the balance of Al. The product and the method have the characteristics of high strength, good molding plasticity, and good plate shape and surface end surface quality, have the characteristic of good flexible conductive action, and can solve the problem of poor conductive performance of a battery pack caused by loosening and breaking of a fastener due to vibration in the running process of an automobile.

Description

High-strength material for flexible connection of new energy power battery and manufacturing method thereof
Technical Field
The invention relates to a high-strength material for flexible connection of a new energy power battery and a manufacturing method thereof, belonging to the technical field of aluminum foil rolling manufacturing.
Background
In recent years, the development of the automobile industry is greatly changed, the yield of new energy automobiles is gradually improved, and meanwhile, the rapid development of the new energy automobile industry also drives the rapid development of the power battery industry. The soft connecting material is used as an important part for connecting new energy automobile batteries, lithium ion batteries, power batteries and the like, and the requirements of customers on raw materials of the soft connecting material are higher and higher. At present, the raw materials of the soft connecting piece mainly adopt purple copper foil or pure aluminum foil, from the view of cost and light weight, the aluminum foil replacing the purple copper foil to be used as a soft connecting material is a great trend, the aluminum foil soft connecting material which is developed, put into production and widely used at present is mainly 1060-O state material, the soft connecting material has the characteristics of good corrosion resistance and strong conductivity, but 1060 material is soft, the battery connecting material has tearing risk in the long-time bumping process, the safety of new energy automobiles is not guaranteed, therefore, the novel soft connecting material which has higher strength and can ensure the processing molding plasticity needs to be developed, and the problem of poor conductivity of the battery pack caused by the loosening and breaking of a fastening piece due to vibration in the operation process of the new energy power battery automobiles is solved.
Disclosure of Invention
In order to solve the problem of poor conductivity of a battery pack caused by the fact that a fastener is loosened and broken due to vibration in the running process of a new energy power battery automobile, the invention aims to research a novel aluminum foil soft connection material which is high in strength and good in plasticity. Based on the purpose of researching the novel high-strength flexible connecting material, the invention provides a novel alloy technical scheme, which comprises the following specific steps:
a high-strength material for flexible connection of a new energy power battery comprises the following components in percentage by mass: 0.20-0.30% of Si, 0.40-0.60% of Fe, 0.08-0.12% of Cu, 1.05-1.20% of Mn, less than or equal to 0.05% of Zn, less than or equal to 0.03% of Ti and the balance of Al.
The invention also provides a manufacturing method of the high-strength new energy power battery flexible connection material, which comprises the following steps:
adding the raw materials in proportion for smelting;
casting and rolling the smelted aluminum material;
cogging the cast-rolled finished product coil and carrying out homogenization annealing;
continuously rolling to the thickness of a finished product after cold rolling and trimming;
performing stretch bending, straightening and cleaning on the finished thickness coil;
cutting the finished thick material roll;
and annealing the cut small coil feeding frame.
Further, the method comprises the following steps:
(1) adding raw materials in proportion, fully and uniformly stirring the raw materials during smelting, wherein the smelting temperature is 735-760 ℃, and the converter-reversing temperature is 740-760 ℃;
(2) the temperature of a front box for cast-rolling production is 705-711 ℃, and the thickness of a cast-rolling aluminum coil finished product is 6.6 +/-0.2 mm;
(3) rough rolling the cast and rolled finished coil to 4.0mm for homogenization annealing;
(4) after homogenizing annealing, rolling to 0.6mm for trimming, and continuously rolling to the thickness of 0.4mm of a finished product after longitudinally shearing the edges;
(5) performing stretch bending, straightening and cleaning on the finished thickness coil;
(6) cutting the finished thick material roll to a finished small roll with the width of 35 mm;
(7) and annealing the cut small coil loading frame to an H24 state.
Further, in the step (3), homogenizing annealing is carried out for 3 hours, the temperature is raised to 580 ℃, and then the temperature is kept for 24-30 hours, and the steel plate is taken out of the furnace and cooled.
Further, the annealing process in the step (7) is to heat up to 260 ℃ for 2 hours and then preserve heat for 7 hours, and then take out of the furnace and cool.
Further, during smelting, a refining agent is adopted to perform melt refining treatment, and then the melt is poured into a standing furnace for standing and heat preservation at 740-760 ℃, wherein the temperature of the standing furnace is 740-750 ℃.
Further, in the cast-rolling production, the temperature of the degassing box is 725 ℃, the air flow rate is 1.0m3/h, and the rotor speed is 230 rpm.
Furthermore, the temperature of the filter box is 720 ℃, the filter plate with 30 meshes is used for filtering, the temperature of the front box is 708 ℃, the length of the casting and rolling area is 43mm, the opening degree of the casting nozzle is 9.0mm, and the casting and rolling linear speed is 850 mm/min.
Further, after homogenizing annealing, 4 passes of cold rolling are carried out on the 4.0mm cast-rolled coil: the rolling process comprises the following steps: 4.0-2.3-1.4-0.9-0.6 mm.
Further, after cold rolling for 0.6mm, longitudinal shearing was carried out to a width of 1040 mm.
Has the advantages that:
according to the technical scheme, the tensile strength of the power battery soft connection product with high strength and good plasticity is 155-175Mpa, the elongation rate can reach 8% or above, the plate type and the surface end face quality are good, the power battery soft connection product has the characteristic of good flexible electric conduction effect, and the problem of poor electric conduction performance of a battery pack caused by loosening and breaking of a fastening piece due to vibration in the operation process of a new energy power battery automobile can be solved.
The invention carries out homogenization annealing at the thickness of 4.0mm, eliminates the stress generated by rolling, improves the uniformity of alloy structure after homogenization annealing at the thickness of 4.0mm through metallographic structure comparison observation, enables precipitated phases to be fully dispersed and precipitated, is combined into product annealing to ensure that the material has higher strength and better molding plasticity, and has the elongation of 8 percent or more when the tensile strength is 155-175 MPa.
Detailed Description
The following examples further describe embodiments of the present invention in detail. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In order to better describe the present invention, the following embodiments are described in detail as examples, and the following examples are only used to more clearly illustrate the technical solutions of the present invention, but not to limit the scope of the present invention.
Example 1
The invention relates to a high-strength material for flexible connection of a new energy power battery, which comprises the following components in percentage by mass: 0.26% of Si, 0.55% of Fe, 0.09% of Cu, 1.12% of Mn, 0.011% of Zn, 0.027% of Ti and the balance of Al.
According to the component control, the soft connection aluminum foil material is further obtained, and the specific preparation steps are as follows:
(1) smelting: fully and uniformly stirring the raw materials during smelting, wherein the smelting temperature is 745 ℃, refining agent is adopted for refining at 745 ℃ for 20min during smelting, and the converter is turned over after the component adjustment meets the control requirement of the invention, and the converter turning temperature is 750 ℃;
(2) casting and rolling: during casting and rolling production, the temperature of a degassing box is controlled to be 725 ℃, the air flow is controlled to be 1.0m3/h, the speed of a rotor is controlled to be 230rpm, the temperature of a filter box is controlled to be 720 ℃, a 30-mesh filter plate is used for filtering, the temperature of a front box is 708 ℃, the length of a casting and rolling area is controlled to be 43mm, the opening degree of a casting nozzle is controlled to be 9.0mm, the casting and rolling linear speed is controlled to be 850mm/min, and the specification of a cast and rolled aluminum coil finished product is 6.6mm in thickness and 1070mm in width;
(3) cogging and uniform withdrawal: firstly, rough rolling the cast-rolled blank to 4.0mm, carrying out homogenization annealing at the temperature of 580 ℃ for 26h, and carrying out cold rolling on the 4.0mm cast-rolled coil for 4 passes after homogenization annealing: the rolling process comprises the following steps: 4.0-2.3-1.4-0.9-0.6mm, performing cold rolling for 0.6mm, then performing longitudinal shearing and edge forming for 1040mm width, and performing finished product rolling after longitudinal shearing and edge forming: 0.6-0.4mm of finished product thickness; other rolling control according to the conventional method;
(4) cold rolling and trimming: after the rolling is carried out uniformly, the rolled product is rolled to 0.6mm for trimming, and the rolled product is continuously rolled to the thickness of 0.4mm after the trimming is carried out longitudinally;
(5) straightening and cleaning: the thickness coil of the finished product is subjected to stretch bending, straightening and cleaning, so that the plate shape is smooth, and the surface has no defects such as indentation pits, oil spots and the like;
(6) slitting: cutting the finished thick material roll to a finished small roll with the width of 35 mm;
(7) annealing of a finished product: and (4) keeping the temperature of the cut small coil feeding frame at 260 ℃ for 7H and annealing to an H24 state.
The performance test of the finished product shows that the tensile strength is 161mpa, the elongation is 8.7%, the aluminum foil version is good, the surface is free of defects, the whole process of blanking is carried out at one time at the client, the fusion is good during the scattered welding, no burrs are generated, the surface is smooth, no oxidation is generated, no layering is generated, and the welding is firm.
Example 2
The invention relates to a high-strength material for flexible connection of a new energy power battery, which comprises the following components in percentage by mass: 0.27% of Si, 0.49% of Fe, 0.10% of Cu, 1.15% of Mn, 0.016% of Zn, 0.021% of Ti and the balance of Al.
According to the component control, the soft connection aluminum foil material is further obtained, and the specific preparation steps are as follows:
(1) smelting: fully and uniformly stirring the raw materials during smelting, wherein the smelting temperature is 745 ℃, refining agent is adopted for refining at 745 ℃ for 20min during smelting, and the converter is turned over after the component adjustment meets the control requirement of the invention, and the converter turning temperature is 750 ℃;
(2) casting and rolling: during casting and rolling production, the temperature of a degassing box is controlled to be 725 ℃, the air flow is controlled to be 1.0m3/h, the speed of a rotor is controlled to be 230rpm, the temperature of a filter box is controlled to be 720 ℃, a 30-mesh filter plate is used for filtering, the temperature of a front box is 708 ℃, the length of a casting and rolling area is controlled to be 43mm, the opening degree of a casting nozzle is controlled to be 9.0mm, the casting and rolling linear speed is controlled to be 850mm/min, and the specification of a cast and rolled aluminum coil finished product is 6.6mm in thickness and 1070mm in width;
(3) cogging and uniform withdrawal: firstly, rough rolling the cast-rolled blank to 4.0mm, carrying out homogenization annealing at the temperature of 580 ℃ for 26h, and carrying out cold rolling on the 4.0mm cast-rolled coil for 4 passes after homogenization annealing: the rolling process comprises the following steps: 4.0-2.3-1.4-0.9-0.6mm, performing cold rolling for 0.6mm, then performing longitudinal shearing and edge forming for 1040mm width, and performing finished product rolling after longitudinal shearing and edge forming: 0.6-0.4mm of finished product thickness; other rolling control according to the conventional method;
(4) cold rolling and trimming: after the rolling is carried out uniformly, the rolled product is rolled to 0.6mm for trimming, and the rolled product is continuously rolled to the thickness of 0.4mm after the trimming is carried out longitudinally;
(5) straightening and cleaning: the thickness coil of the finished product is subjected to stretch bending, straightening and cleaning, so that the plate shape is smooth, and the surface has no defects such as indentation pits, oil spots and the like;
(6) slitting: cutting the finished thick material roll to a finished small roll with the width of 35 mm;
(7) annealing of a finished product: and (4) keeping the temperature of the cut small coil feeding frame at 260 ℃ for 7H and annealing to an H24 state.
The performance test of the finished product shows that the tensile strength is 161mpa, the elongation is 9.2%, the aluminum foil version is good, the surface is free of defects, the whole process of blanking is carried out at one time at the client, the fusion is good during the scattered welding, no burrs are generated, the surface is smooth, no oxidation is generated, no layering is generated, and the welding is firm.
As can be seen from the above embodiment, under the alloy composition and the process flow of the invention, the rolling production is carried out according to the embodiment 1 and 2, the tensile strength of the finished product is 155-175MPa, and the elongation can reach 8% or more. The invention carries out homogenizing annealing at the thickness of 4.0mm, eliminates the stress generated by rolling, improves the uniformity of alloy structure, ensures that precipitated phases can be fully separated out, and combines product annealing to ensure that the material has higher strength and better molding plasticity.
The above description is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that appropriate modifications and optimization can be made based on the technical principle of the present invention, and these modifications and optimization should also be regarded as the protection scope of the present invention.

Claims (2)

1. The manufacturing method of the material for the flexible connection of the high-strength new energy power battery is characterized in that the material comprises the following components in percentage by mass: 0.26% of Si, 0.55% of Fe, 0.09% of Cu, 1.12% of Mn, 0.011% of Zn, 0.027% of Ti and the balance of Al;
the method comprises the following steps:
(1) smelting: fully and uniformly stirring the raw materials during smelting, wherein the smelting temperature is 745 ℃, refining agent is adopted for refining at 745 ℃ for 20min during smelting, and the converter is turned over after the components are adjusted, wherein the converter turning temperature is 750 ℃;
(2) casting and rolling: during casting and rolling production, the temperature of the degassing box is 725 ℃, and the gas flow is 1.0m3H, the rotor speed is 230rpm, the temperature of a filter box is 720 ℃, a 30-mesh filter plate is used for filtering, the temperature of a front box is 708 ℃, the length of a cast-rolling area is controlled to be 43mm, the opening degree of a casting nozzle is controlled to be 9.0mm, the cast-rolling linear speed is controlled to be 850mm/min, and the specification of a cast-rolling aluminum coil finished product is 6.6mm in thickness and 1070mm in width;
(3) cogging and homogenizing annealing: firstly, rough rolling the cast-rolled blank to 4.0mm for carrying out homogenization annealing, wherein the homogenization annealing is carried out by heating to 580 ℃ for 3h, keeping the temperature for 26h, discharging and cooling, and carrying out 4-pass cold rolling on the 4.0mm cast-rolled coil after homogenization annealing: the rolling process comprises the following steps: 4.0-2.3-1.4-0.9-0.6mm, performing cold rolling for 0.6mm, then performing longitudinal shearing and edge forming for 1040mm width, and performing finished product rolling after longitudinal shearing and edge forming: 0.6-0.4mm of finished product thickness;
(4) cold rolling and trimming: after homogenizing annealing, rolling to 0.6mm for trimming, and continuously rolling to the thickness of 0.4mm of a finished product after longitudinally shearing the edges;
(5) straightening and cleaning: the finished product thickness coil is subjected to stretch bending, straightening and cleaning, so that the plate shape is smooth, and the surface has no indentation, pit or oil spot defects;
(6) slitting: cutting the finished thick material roll to a finished small roll with the width of 35 mm;
(7) annealing of a finished product: keeping the temperature of the cut small coil feeding frame at 260 ℃ for 7H, and annealing to an H24 state; the annealing process is that the temperature is raised to 260 ℃ for 2 hours, and then the temperature is preserved for 7 hours, and the product is taken out of the furnace and cooled;
the tensile strength of the material is 161MPa, and the elongation is 8.7%.
2. The material for the soft connection of the high-strength new energy power battery is characterized by being prepared by the manufacturing method of the material for the soft connection of the high-strength new energy power battery according to claim 1.
CN202010147368.6A 2020-03-05 2020-03-05 High-strength material for flexible connection of new energy power battery and manufacturing method thereof Active CN111254320B (en)

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