CN115305389A - Aluminum alloy battery shell plate and production method thereof - Google Patents
Aluminum alloy battery shell plate and production method thereof Download PDFInfo
- Publication number
- CN115305389A CN115305389A CN202210968128.1A CN202210968128A CN115305389A CN 115305389 A CN115305389 A CN 115305389A CN 202210968128 A CN202210968128 A CN 202210968128A CN 115305389 A CN115305389 A CN 115305389A
- Authority
- CN
- China
- Prior art keywords
- percent
- aluminum alloy
- plate
- rolling
- cold rolling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 238000000137 annealing Methods 0.000 claims abstract description 34
- 238000005266 casting Methods 0.000 claims abstract description 30
- 238000005097 cold rolling Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 21
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 19
- 238000005096 rolling process Methods 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 238000003801 milling Methods 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 238000005204 segregation Methods 0.000 claims abstract description 9
- 239000010936 titanium Substances 0.000 claims abstract description 8
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 239000000956 alloy Substances 0.000 claims description 37
- 229910045601 alloy Inorganic materials 0.000 claims description 31
- 239000000155 melt Substances 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 14
- 238000005098 hot rolling Methods 0.000 claims description 13
- 238000007872 degassing Methods 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 11
- 230000008018 melting Effects 0.000 claims description 11
- 238000000265 homogenisation Methods 0.000 claims description 10
- 238000007670 refining Methods 0.000 claims description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 7
- 230000007547 defect Effects 0.000 claims description 6
- 238000003754 machining Methods 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 5
- 206010028980 Neoplasm Diseases 0.000 claims description 4
- -1 aluminum titanium boron Chemical compound 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 239000003345 natural gas Substances 0.000 claims description 4
- 238000005482 strain hardening Methods 0.000 claims description 4
- 238000000746 purification Methods 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 11
- 238000003723 Smelting Methods 0.000 abstract description 3
- 230000002411 adverse Effects 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 20
- 239000011572 manganese Substances 0.000 description 14
- 239000013078 crystal Substances 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 229910016583 MnAl Inorganic materials 0.000 description 7
- 238000001953 recrystallisation Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 5
- 238000004080 punching Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical group [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical group 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229910018131 Al-Mn Inorganic materials 0.000 description 2
- 229910018461 Al—Mn Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910015372 FeAl Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0268—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment between cold rolling steps
-
- 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
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- 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
-
- 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
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B2003/001—Aluminium or its alloys
-
- 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
Abstract
The invention discloses an aluminum alloy battery shell plate, which comprises the following chemical components in percentage by weight: 0.20 to 0.25 percent of Si, 0.50 to 60 percent of Fe, 0.06 to 0.10 percent of Cu, 1.05 to 1.15 percent of Mn, less than 0.05 percent of Mg, less than 0.015 percent of Zn, 0.025 to 0.035 percent of Ti titanium, less than or equal to 0.03 percent of single impurity, less than or equal to 0.15 percent of total amount of impurity and the balance of Al and Al. The method comprises the following steps of smelting → ingot casting → face milling → homogenizing heating → hot continuous rolling → cold rolling → intermediate annealing → secondary cold rolling → finishing and the like, and pays attention to the influence of each process parameter on the mechanical property, anisotropy, texture distribution, grain structure, surface quality and thickness tolerance of the material, and selects a proper homogenizing heating system to perform sufficient homogenizing annealing on the ingot casting, eliminate the adverse influence of component segregation on the performance of the finished product, so that the aluminum plate product for the battery case, which has excellent stamping performance, good surface quality and stable various performances and thickness precision of the plate, is produced.
Description
Technical Field
The invention belongs to the technical field of aluminum calendering processing, and particularly relates to an aluminum alloy battery shell plate and a production method thereof.
Background
With the continuous promotion of the aim of 'double carbon', the concepts of energy conservation, environmental protection and green travel are deeply focused in recent years. However, as a power device-a power battery for new energy traffic, it is difficult to be reduced without limit due to the influence of processing and manufacturing technology, and in order to adapt to the development trend of new energy traffic, the research and development of a portable and small power battery with lasting endurance mileage has become one of the key issues of new energy traffic. Under such a background, research on materials for power batteries is increasingly paid attention by new energy transportation battery manufacturers. In recent years, the aluminum alloy plate strip is gradually replacing the original material for the power battery shell, namely steel, due to the characteristics of excellent comprehensive machining performance, good corrosion resistance, light specific gravity and the like, and the market prospect of the aluminum alloy battery shell plate is very wide.
The aluminum alloy battery shell has extremely high requirements on the comprehensive performance of materials, and firstly, the aluminum alloy battery shell is formed by stamping and stretching, so that the aluminum alloy battery shell has large deformation, multiple stamping processes, complex stamping process and precise mold design and belongs to asymmetric box-shaped stamping. Whether the stamping and stretching process can be smoothly carried out is related to factors such as material performance, stamping die design, stamping process parameters and the like. Among them, the performance of the material is one of the most important basic conditions for the success of drawing and stretching, so the material used must have good deep drawing performance, and the mechanical properties must be stabilized in a strict range. Second, in order to effectively protect the internal battery structure, the aluminum alloy battery case must have sufficient strength and hardness while ensuring necessary plasticity. Third, in order to adapt to various use environments and ensure the service life of the battery, the material for the aluminum alloy battery case must have good corrosion resistance and chemical stability. The invention aims to research and determine a reasonable production process of the aluminum alloy battery shell plate through experimental research and develop an aluminum alloy plate product with excellent performance and suitable for producing a battery shell.
The invention adopts an advanced hot continuous rolling mode to produce the aluminum alloy battery shell plate, and has short process, low energy consumption and low cost. In order to ensure the mechanical property and deep drawing processing technique property of the hot-rolled aluminum alloy battery shell plate, a whole set of technique control method is established, and appropriate methods such as chemical composition standard, casting system, ingot casting homogenization system, hot rolling final rolling temperature, cold rolling intermediate annealing system, processing rate control after annealing, thickness tolerance control, surface quality control and the like are established.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the aluminum alloy battery shell plate and the production method thereof are provided, and the mechanical property and the earing rate of an aluminum plate are ensured to meet the requirements of deep drawing and stretching forming of an aluminum alloy battery case by formulating a proper chemical composition standard, a casting system, an ingot casting homogenization system, a hot rolling final rolling temperature, a cold rolling intermediate annealing system, control of a machining rate after annealing and control of a thickness tolerance, so that the aluminum alloy battery shell plate with the mechanical property, the deep drawing property, the thickness tolerance and the surface quality meeting the requirements is produced.
The technical scheme adopted by the invention for solving the technical problem is as follows:
the aluminum alloy battery shell plate is mainly prepared from 3003 aluminum alloy, and comprises the following chemical components in percentage by weight: 0.20 to 0.25 percent of Si, 0.50 to 60 percent of Fe, 0.06 to 0.10 percent of Cu, 1.05 to 1.15 percent of Mn, less than 0.05 percent of Mg, less than 0.015 percent of Zn, 0.025 to 0.035 percent of Ti titanium, less than or equal to 0.03 percent of single impurity, less than or equal to 0.15 percent of total amount of impurity and the balance of Al and Al.
The production method of the aluminum alloy battery shell plate comprises the following specific steps:
A. casting:
melting the raw materials by adopting a natural gas reverberatory furnace, wherein the melting temperature is 700-740 ℃, refining, degassing and deslagging the melt after melting, then transferring the melt into a heat preservation furnace, accurately adjusting the components of the melt according to the requirement of claim 1, and standing the melt before casting after the components are inspected to be qualified;
B. ingot casting: al-5Ti-0.2B aluminum titanium boron wires are used for grain refinement on line, and a tubular filtration method is adopted for melt purification treatment during casting, so that the melt quality is improved;
C. milling a surface: after casting, the cast ingot is subjected to surface milling treatment, the surface milling thickness is 25mm, the defects of cold shut and segregation tumor generated in the casting process are eliminated, and the surface quality of subsequent processing is ensured;
D. homogenizing and heating: the furnace gas is adopted for heating up to 600 ℃ and then homogenizing for 10h, and the total time of entering the furnace is not more than 24h so as to ensure the structure and performance of the product;
E. hot continuous rolling: carrying out hot continuous rolling on the ingot subjected to homogenization treatment to obtain a hot rolled plate blank with the thickness of 6mm, wherein the hot rolling heating temperature is 480-520 ℃, and the final rolling temperature is 300-310 ℃;
F. cold rolling: cold rolling the hot continuous rolled blank to an alloy material with the thickness of 1.0 mm;
G. intermediate annealing: controlling the work hardening degree of the alloy material after cold rolling through intermediate annealing temperature, wherein the annealing temperature is 320-360 ℃;
H. the processing rate is as follows: the machining rate of 23% is adopted after intermediate annealing, so that the mechanical property and the lug making rate of the alloy plate are ensured;
I. secondary cold rolling: the tolerance of the thickness of the secondary cold rolling finished product is kept within plus or minus 0.01mm;
J. and (3) finishing: and finishing the aluminum alloy plate subjected to secondary cold rolling to obtain a raw material of the aluminum alloy battery shell plate for later use.
In the step A, the smelted melt is filtered by an online filtering system of plate filtering and deep bed filtering in the refining process; the degassing and deslagging are carried out on line by utilizing a degassing box and a filter box.
In the invention, 3003 alloy is mainly used as a main raw material, and 3003 is a typical alloy of Al-Mn series antirust aluminum, and has the outstanding characteristic of good corrosion resistance which is similar to that of pure aluminum. The strength of the alloy is higher than that of pure aluminum, and the alloy has higher plasticity and good deep drawing forming performance, and is widely suitable for various places needing to be processed and formed, such as chemical equipment, civil hardware and the like, and simultaneously has good corrosion resistance and moderate strength. Therefore, 3003 alloy is selected to be developed into the aluminum alloy plate suitable for producing the battery shell plate.
The mechanism of the influence of 3003 alloy component change on product performance and structure is as follows: mn has a certain solid solution strengthening effect, can prevent the recrystallization process of aluminum and aluminum alloy, improve the recrystallization temperature, and pass through MnAl 6 The dispersed particles prevent the growth of recrystallized grains and can obviously refine the recrystallized grains. According to the investigation of the skilled person, the elongation reaches a maximum at a Mn content of 0.8%, and the strength of the material in the range of 1.82% (limit solubility of Mn) increases with increasing Mn content. However, when the Mn content exceeds 1.6%, coarse, brittle and hard MnAl will appear 6 And the local ductility of the alloy is affected in a catastrophic way, so that the Mn content is determined to be between the middle and lower line 1.05 and 1.15 percent of the alloy.
Fe in the alloy is a beneficial impurity element, because Mn is easy to generate intragranular segregation and can obviously improve the recrystallization temperature, during the annealing process of the cold deformed 3003 plate, the low manganese part is recrystallized and the crystal grain grows up, while the high manganese part is not recrystallized, so that the crystal grain size of the plate is not uniform, and iron can be dissolved into MnAl 6 In (C), form (FeMn) Al 6 And the segregation of Mn is reduced, so that the annealed sheet material obtains fine grains. However, (FeMn) Al 6 When too much, the mechanical property of the alloy is reduced, so that the Fe content is controlled to be 0.50-0.60%.
Mg can improve the strength of Al-Mn alloy and refine the recrystallization structure, but can reduce the surface gloss of an annealed semi-finished product, so in order to ensure the brightness of the surface of the aluminum alloy battery shell, the content of Mg is strictly controlled by the method, and the requirement is less than 0.05 percent.
The Cu content of the invention is controlled between 0.06 and 0.10 percent, the corrosion resistance of the material is obviously reduced by increasing the Cu content, but the point corrosion of the material can be changed into uniform corrosion by a small amount of Cu, so the invention is favorable.
Si increases the hot cracking tendency of the 3003 alloy and may form (FeMn) 3 SiAl 12 The beneficial effect of iron is reduced, zn can reduce the corrosion resistance of the alloy, so that the invention strictly controls Si and Zn, controls the Si content to be 0.20-0.25%, and requires the Zn content to be less than 0.015%.
In conclusion, in order to obtain good structure and stable mechanical properties, the influence of each element on the structure and the properties of the alloy is comprehensively considered, the components of the alloy are scientifically designed and strictly controlled, and the chemical composition components of the aluminum alloy battery shell plate are obtained, which are shown in table 1.
TABLE 1 chemical composition/% of the aluminum alloy battery case plate of the present invention
The invention ensures that the annealed product obtains an ideal uniform and fine recrystallization structure through the optimized design and strict control of the components, and the performance stability of the finished product is greatly improved, which is shown in Table 2.
TABLE 2 comparison of product Properties
| Alloy (I) | State of state | σ b（MPa） | σ s（MPa） | δ 50 （％） |
| Ordinary 3003 alloy | H14 | 153～176 | 142～158 | 5.4～7.8 |
| Alloy of the invention | H14 | 140～160 | 130～150 | 8.2～10.3 |
The casting process strictly controls the smelting temperature and the processes of refining, degassing, deslagging, filtering and the like, so that the quality of the cast ingot reaches the expected index, the quality defects of the cast ingot such as looseness, pores, metal or nonmetal slag inclusion and the like are effectively reduced, and the strict requirements of deep-drawing products on materials are met.
The effects of the homogenization annealing on the texture and properties of the product are: 3003 the main element of the alloy is Mn, which is present in the matrix in the form of supersaturated solid solution, and partly as MnAl, due to the rapid cooling rate and the low diffusion coefficient of manganese atoms during the semi-continuous casting process 6 The compound forms a continuous network eutectic with the matrix at the grain boundary, and a small amount of coarse hard and brittle primary crystals exist. The block-shaped primary crystals which are not subjected to heat treatment can be fully crushed under the action of large rolling pressure in the hot rolling processing stage and are distributed in a strip shape along the deformation direction. Although reduced in size, a small amount of MnAl 6 The angular part of the compound particle becomes more sharp, and the appearance can hardly be changed by cold processing and finished product annealing, so that the compound particle is always kept in the internal structure of the material. In the deep drawing deformation process of products, the material is easy to generate micro cracks at the sharp part under the action of external stress, and the 3003 alloy is extremely cracked under the non-equilibrium crystallization conditionThe method has the advantages that the method is easy to generate intragranular segregation, the content of Mn is high at the outside and low at the inside, recrystallized grains after annealing are inconsistent in size, and the bonding strength of crystal boundaries is greatly reduced. High-power microscopic detection shows that when the homogenization temperature reaches 550 ℃, mnAl 6 The phases were partially dissolved, the sharp edges were smoothed, and when the temperature exceeded 600 ℃, the distribution of the Mn element in the matrix became non-uniform again with the remelting of the second phase and the aggregation and growth of primary crystals, so the homogenization temperature of the 3003 alloy was set at 580 ℃ to 600 ℃ and the homogenization degree was set at 600 ℃/10h.
The hot rolling heating temperature and the finish rolling temperature have the following effects on the hot rolled structure: in the observation of the polarization structure, when the hot rolling heating temperature is 480 to 520 ℃ and the finish rolling temperature is 300 to 310 ℃, the structure morphology is stable (the surface structure of the hot rolled blank in contact with the roll is mostly a fine recrystallized structure, the amount of deformation of the core part is small, the amount of recrystallization structure is small, and the crystal grains are relatively coarse), and the edge cracking tendency of the hot rolled blank is small, and the subsequent processing is not adversely affected. When the hot rolling finishing temperature is lower than 300 ℃, the hot rolling surface structure contains a deformed structure, the content of the deformed structure is increased along with the reduction of the temperature, and simultaneously the edge cracking defect after hot rolling is aggravated, so the hot rolling finishing temperature is controlled to be 300-310 ℃.
For a material cold rolled to a thickness of 1.0mm, a sample was first taken for a lab bench annealing test, annealing temperature: 170-500 ℃ and the heat preservation time is 2 hours. The annealing softening curve was plotted against the small annealed specimen test results, see fig. 1.
According to the annealing softening curve, the intermediate value required by the performance is intercepted, the annealing temperature of the plate in the O state can be determined to be about 320-360 ℃, and the intermediate annealing process is set to be 500 ℃/340 ℃/0.5 h/345 ℃/2h. The ear-making rate under different systems is shown in Table 3.
TABLE 3 Tab-making rate for different temperature anneals
The effect of different work rates on the longitudinal properties of the 6.0mm hot rolled stock is shown in figure 2.
The effect of different reduction ratios on the 45 degree properties of the 6.0mm hot rolled stock is shown in FIG. 3.
The effect of different work rates on the transverse directional properties of 6.0mm hot rolled stock is shown in FIG. 4
As can be seen from fig. 2, 3 and 4, the mechanical properties after the cold rolling intermediate annealing at a reduction ratio of about 23% satisfy the service performance of the H14 product.
The aluminum alloy battery shell plate in the 3003H14 state produced by the production method can produce aluminum plate products for battery shells with excellent stamping performance, good surface quality, stable various performances, thickness precision and the like of the plate, and meets the use requirements of users.
Drawings
FIG. 1 is an annealing softening curve of a sheet cold rolled to a thickness of 1.0 mm;
FIG. 2 is a graph showing the effect of different work rates on the longitudinal properties of 6.0mm hot rolled stock;
FIG. 3 is a graph showing the effect of different reduction ratios of 6.0mm hot rolled stock on the 45 degree directional properties;
FIG. 4 is a graph showing the effect of different reduction ratios on the transverse directional properties of 6.0mm hot rolled stock.
Detailed Description
The invention will be further explained and illustrated with reference to specific examples:
example (b): an aluminum alloy battery case plate having a chemical composition, in weight percent, as follows: 0.20 to 0.25 percent of Si, 0.50 to 60 percent of Fe, 0.06 to 0.10 percent of Cu, 1.05 to 1.15 percent of Mn, less than 0.05 percent of Mg, less than 0.015 percent of Zn, 0.025 to 0.035 percent of Ti titanium, less than or equal to 0.03 percent of single impurity, less than or equal to 0.15 percent of total amount of impurity and the balance of Al and Al.
The production method of the aluminum alloy battery shell plate comprises the following specific steps:
A. casting:
melting the raw materials by adopting a natural gas reverberatory furnace, wherein the melting temperature is 700-740 ℃, refining, degassing and deslagging the melt after melting, then transferring the melt into a heat preservation furnace, accurately adjusting the components of the melt according to the requirement of claim 1, and standing the melt before casting after the components are inspected to be qualified;
B. ingot casting: al-5Ti-0.2B aluminum titanium boron wires are used for grain refinement on line, and a tubular filtration method is adopted for melt purification treatment during casting, so that the melt quality is improved;
C. milling a surface: after casting, the cast ingot is subjected to surface milling treatment, the surface milling thickness is 25mm, the defects of cold shut and segregation tumor generated in the casting process are eliminated, and the surface quality of subsequent processing is ensured;
D. homogenizing and heating: the furnace gas is adopted to raise the temperature to 600 ℃ and then is homogenized for 10 hours, and the total time of charging the furnace is not more than 24 hours so as to ensure the structure and performance of the product;
E. hot continuous rolling: carrying out hot continuous rolling on the ingot subjected to homogenization treatment to obtain a hot rolled plate blank with the thickness of 6mm, wherein the hot rolling heating temperature is 480-520 ℃, and the final rolling temperature is 300-310 ℃;
F. cold rolling: cold rolling the hot continuous rolled blank to an alloy material with the thickness of 1.0 mm;
G. intermediate annealing: controlling the work hardening degree of the alloy material after cold rolling through intermediate annealing temperature, wherein the annealing temperature is 320-360 ℃;
H. the processing rate is as follows: the machining rate of 23% is adopted after intermediate annealing, so that the mechanical property and the lug making rate of the alloy plate are ensured;
I. secondary cold rolling: the tolerance of the thickness of the secondary cold rolling finished product is kept within plus or minus 0.01mm;
J. and (3) finishing: and finishing the aluminum alloy plate subjected to secondary cold rolling to obtain a raw material of the aluminum alloy battery shell plate for later use.
In the step A, the smelted melt is filtered by an online filtering system of plate filtering and deep bed filtering in the refining process; the degassing and deslagging are carried out on line by utilizing a degassing box and a filter box.
3003 the main alloying element of the alloy is Mn, which forms MnAl with Al 6 The dispersed particles hinder the growth of crystal grains during alloy annealing so as to obtain fine crystal grains, and the fine crystal grains are an important index for optimizing material performance. On the other hand, mnAl 6 The electrode potential of the anode is practically equal to that of pure aluminum (both are-0.86V), and the electrode potential of the anode is MnAl 6 Can dissolve Fe element in alloyFormation of (FeMn) Al 6 FeAl in the alloy 3 Thereby minimizing the potential difference between the alloy and Al and increasing the corrosion resistance of the alloy. However, too high Mn content may cause serious segregation, which may cause coarse grain during subsequent heat treatment, thereby adversely affecting the properties of the material.
3003 the fluctuation of the contents of other elements such as Fe, si, cu, mg, zn, etc. in the alloy will affect the final performance and stability of the finished product, therefore, the invention strictly controls each component in the alloy in order to ensure the stable performance of the finished product.
The invention adopts the process steps of smelting → ingot casting → surface milling → uniform heating → hot continuous rolling → cold rolling → intermediate annealing → secondary cold rolling → finishing and the like. Melting by adopting a natural gas reverberatory furnace, refining at the melting temperature of 700-740 ℃, degassing, deslagging, transferring into a heat preservation furnace to accurately adjust components, standing before casting after the components are qualified, refining grains by using Al-5Ti-0.2B aluminum titanium boron wires on line, and purifying the melt by adopting a tubular filtration method during casting, thereby improving the quality of the melt. And after casting, the cast ingot is subjected to surface milling treatment, the surface milling thickness is 25mm, the defects of cold shut, segregation tumor and the like generated in the casting process are eliminated, and the surface quality of subsequent processing is ensured. The furnace gas is heated up to 600 ℃ and then homogenized for 10 hours, and the total time of charging the furnace is not more than 24 hours so as to ensure the structure and performance of the product.
The ingot after the homogenization treatment is rolled into a hot rolled plate blank with the thickness of 6mm in a hot continuous rolling way, and the recrystallization target is achieved through the hot rolling finishing temperature, the rolling speed and the cooling and lubricating mode; the cold rolling controls the work hardening degree, the texture distribution and the anisotropy through the intermediate annealing temperature and the work rate to achieve the required mechanical property of 3003H14 state: the tensile strength is 140-160MPa, the specified non-proportional elongation strength is 130-150MPa, and the elongation after fracture is more than 8%. The ear making rate of each anisotropy characterization value is 1-2%.
After cold rolling and intermediate annealing, the mechanical property and the lug making rate of the aluminum plate are ensured by adopting the machining rate of 23 percent. Because the die design of the punching equipment of the aluminum alloy battery case is complex and precise, and the gap is fixed, the requirement on the thickness tolerance of the aluminum alloy plate is extremely strict, and the tolerance of the thickness of the cold-rolled finished product must be kept within +/-0.01 mm, which is far higher than the requirement of national standard 3880-2012 on the thickness of the common plate within +/-0.04 mm. If the thickness is too thick, normal punching cannot be performed, damage to the die during punching is large, the service life of the die is shortened seriously, and if the thickness is too thin, the material cannot provide enough flow compensation during punching, or the material is deformed asymmetrically and even wrinkles during punching.
The aluminum alloy battery shell plate in the 3003H14 state produced by the production method can produce aluminum plate products for battery shells with excellent stamping performance, good surface quality, stable various performances, thickness precision and the like of the plate, and meets the use requirements of users.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any person skilled in the art who is skilled in the art can substitute or change the technical solution and idea of the present invention within the technical scope of the present invention.
Claims (3)
1. The utility model provides an aluminum alloy battery shell board, main raw and other materials are 3003 aluminum alloy, its characterized in that: the aluminum alloy battery shell plate comprises the following chemical components in percentage by weight: 0.20 to 0.25 percent of Si, 0.50 to 60 percent of Fe, 0.06 to 0.10 percent of Cu, 1.05 to 1.15 percent of Mn, less than 0.05 percent of Mg, less than 0.015 percent of Zn, 0.025 to 0.035 percent of Ti titanium, less than or equal to 0.03 percent of single impurity, less than or equal to 0.15 percent of total amount of impurity and the balance of Al and Al.
2. The method for producing an aluminum alloy battery skin plate as recited in claim 1, comprising the steps of:
A. casting:
melting the raw materials by a natural gas reverberatory furnace at the melting temperature of 700-740 ℃, refining, degassing and deslagging the melt after melting, then transferring the melt into a heat preservation furnace, accurately adjusting the components of the melt according to the requirements of claim 1, and standing the melt before casting after the components are qualified;
B. ingot casting: al-5Ti-0.2B aluminum titanium boron wires are used for grain refinement on line, and a tubular filtration method is adopted for melt purification treatment during casting, so that the melt quality is improved;
C. milling a surface: after casting, the cast ingot is subjected to surface milling treatment, the surface milling thickness is 25mm, the defects of cold shut and segregation tumor generated in the casting process are eliminated, and the surface quality of subsequent processing is ensured;
D. homogenizing and heating: the furnace gas is adopted to raise the temperature to 600 ℃ and then is homogenized for 10 hours, and the total time of charging the furnace is not more than 24 hours so as to ensure the structure and performance of the product;
E. hot continuous rolling: carrying out hot continuous rolling on the ingot subjected to homogenization treatment to obtain a hot rolled plate blank with the thickness of 6mm, wherein the hot rolling heating temperature is 480-520 ℃, and the final rolling temperature is 300-310 ℃;
F. cold rolling: cold rolling the hot continuous rolled blank to an alloy material with the thickness of 1.0 mm;
G. intermediate annealing: controlling the work hardening degree of the alloy material after cold rolling through intermediate annealing temperature, wherein the annealing temperature is 320-360 ℃;
H. the processing rate is as follows: the machining rate of 23% is adopted after intermediate annealing, so that the mechanical property and the lug making rate of the alloy plate are ensured;
I. secondary cold rolling: the tolerance of the thickness of the secondary cold rolling finished product is kept within +/-0.01 mm;
J. and (3) finishing: and finishing the aluminum alloy plate subjected to secondary cold rolling to obtain a raw material of the aluminum alloy battery shell plate for later use.
3. The production method of an aluminum alloy battery case plate according to claim 2, characterized in that: in the step A, the smelted melt is filtered by an online filtering system of plate filtering and deep bed filtering in the refining process; the degassing and deslagging are carried out on line by utilizing a degassing box and a filter box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210968128.1A CN115305389A (en) | 2022-08-12 | 2022-08-12 | Aluminum alloy battery shell plate and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210968128.1A CN115305389A (en) | 2022-08-12 | 2022-08-12 | Aluminum alloy battery shell plate and production method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115305389A true CN115305389A (en) | 2022-11-08 |
Family
ID=83861975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210968128.1A Pending CN115305389A (en) | 2022-08-12 | 2022-08-12 | Aluminum alloy battery shell plate and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115305389A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0625787A (en) * | 1992-07-09 | 1994-02-01 | Kobe Steel Ltd | Ai alloy sheet for drawn cup excellent in suppression of strain pattern and its manufacture |
| CN101037742A (en) * | 2007-04-17 | 2007-09-19 | 东北轻合金有限责任公司 | Alloy plate strip for hand phone battery case and manufacturing method thereof |
| CN105063430A (en) * | 2015-07-28 | 2015-11-18 | 大力神铝业股份有限公司 | 3003-H16 aluminum alloy plate strip and production method thereof |
| CN109666822A (en) * | 2019-01-15 | 2019-04-23 | 大力神铝业股份有限公司 | It is a kind of for producing the preparation method of 3003-H14 aluminum alloy battery shell material |
| CN110453110A (en) * | 2019-09-03 | 2019-11-15 | 南通恒金复合材料有限公司 | A kind of housing of power cell aluminium alloy strips and preparation method thereof |
-
2022
- 2022-08-12 CN CN202210968128.1A patent/CN115305389A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0625787A (en) * | 1992-07-09 | 1994-02-01 | Kobe Steel Ltd | Ai alloy sheet for drawn cup excellent in suppression of strain pattern and its manufacture |
| CN101037742A (en) * | 2007-04-17 | 2007-09-19 | 东北轻合金有限责任公司 | Alloy plate strip for hand phone battery case and manufacturing method thereof |
| CN105063430A (en) * | 2015-07-28 | 2015-11-18 | 大力神铝业股份有限公司 | 3003-H16 aluminum alloy plate strip and production method thereof |
| CN109666822A (en) * | 2019-01-15 | 2019-04-23 | 大力神铝业股份有限公司 | It is a kind of for producing the preparation method of 3003-H14 aluminum alloy battery shell material |
| CN110453110A (en) * | 2019-09-03 | 2019-11-15 | 南通恒金复合材料有限公司 | A kind of housing of power cell aluminium alloy strips and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108315606B (en) | 1100 alloy aluminum foil for lithium battery and manufacturing method thereof | |
| CN111793759B (en) | 1070 high-performance aluminum foil for lithium ion battery and preparation method thereof | |
| CN111440970B (en) | 6-series aluminum alloy plate for automobile body outer plate and preparation method thereof | |
| EP4063530A1 (en) | 7xxx series aluminum alloy or plate, manufacturing method therefor, processing method therefor, and application thereof | |
| CN100519797C (en) | Al-Mg alloy sheet with excellent formability at high temperatures and high speeds and method of production of same | |
| CN111893351B (en) | Aluminum foil for 1235D lithium battery and preparation method thereof | |
| CN104532077B (en) | Short-flow preparation method for 6XXX-series aluminum alloy automotive body sheet without paint brushed lines | |
| CN102639732A (en) | Copper alloy sheet | |
| CN110629083B (en) | Marine 5083 aluminum alloy plate and preparation process thereof | |
| EP3733880B1 (en) | Non-oriented electrical steel sheet and manufacturing method therefor | |
| CN104975209A (en) | 6000 series aluminum alloy material with high natural aging stability, aluminum alloy plate and preparing method of aluminum alloy plate | |
| CN109402456B (en) | Double-sided dark battery foil and preparation method thereof | |
| CN101899632A (en) | Production method of 3003 aluminum alloy deep-drawing wafer | |
| CN110484785A (en) | A kind of high-performance power battery aluminium foil preparation process | |
| CN109666822A (en) | It is a kind of for producing the preparation method of 3003-H14 aluminum alloy battery shell material | |
| JP2008063623A (en) | Method for producing aluminum alloy sheet for forming | |
| CN113913654A (en) | Preparation method of 6-series aluminum plate for battery pack lower shell of electric automobile | |
| CN114182144A (en) | Aluminum plate for anodic oxidation with excellent surface quality after thinning and preparation method thereof | |
| CN109868398B (en) | 6xxx series aluminum alloy plate with high flanging performance and preparation method thereof | |
| CN104561668A (en) | Aluminum alloy sheet for wine cover material and production method of aluminum alloy sheet | |
| CN114540649A (en) | High-forming baking-resistant 5xxx series aluminum alloy plate and preparation method thereof | |
| CN109988947B (en) | Corrosion resistant weldable alloy and method of making same | |
| JP2004027253A (en) | Aluminum alloy sheet for molding, and method of producing the same | |
| JP2008231475A (en) | Aluminum alloy sheet for forming workpiece, and producing method therefor | |
| CN115305389A (en) | Aluminum alloy battery shell plate and production method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |