CN111647775A - New energy power battery case, aluminum alloy and manufacturing method thereof - Google Patents
New energy power battery case, aluminum alloy and manufacturing method thereof Download PDFInfo
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- 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
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Abstract
The invention provides a new energy power battery case, an aluminum alloy and a manufacturing method thereof. Wherein the aluminum alloy comprises the following components in percentage by weight: si: 0.17% -0.30%, Fe: 0.50-0.60%, Cu: 0.02% -0.08%, Mn: 0.90% -1.05%, Mg: 0.02% -0.06%, Zn: less than or equal to 0.05 percent, Ti: 0.015-0.04%, the balance of Al and single elements less than 0.05%, and inevitable impurities with the total amount less than 0.15%. The aluminum alloy provided by the invention has good plastic deformation capability and can meet the requirements of deep drawing performance and surface quality of battery cases.
Description
Technical Field
The invention belongs to the field of aluminum alloy, and particularly relates to aluminum alloy for a new energy power battery shell, a manufacturing method of the aluminum alloy and the new energy power battery shell comprising the aluminum alloy.
Background
The new energy power battery is known as the heart of a new energy automobile, and the battery shell of the new energy power battery is usually made of aluminum alloy. During the forming process of the battery shell, the deformation is large, and the surface of the battery shell cannot be scratched when the battery shell is in contact with a mold. However, the existing aluminum alloy for the new energy power battery shell has large crystal grains and insufficient deep drawing performance, the surface of the shell is easy to be rough after forming, the appearance quality is poor, the replacement frequency of a die in the punch forming process can be increased, and the production efficiency is reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an aluminum alloy for a new energy power battery case, a manufacturing method of the aluminum alloy and the new energy power battery case comprising the aluminum alloy.
The invention aims to provide an aluminum alloy for a new energy power battery case, which consists of the following components in percentage by weight: si: 0.17% -0.30%, Fe: 0.50-0.60%, Cu: 0.02% -0.08%, Mn: 0.90% -1.05%, Mg: 0.02% -0.06%, Zn: less than or equal to 0.05 percent, Ti: 0.015-0.04%, the balance of Al and single elements less than 0.05%, and inevitable impurities with the total amount less than 0.15%.
In some embodiments of the invention, the aluminum alloy has an elongation of > 40% and a cupping value of > 12.5 mm.
In some embodiments of the invention, the aluminum alloy has an average grain size < 30 μm.
A second object of the present invention is to provide a method for producing the above aluminum alloy, which comprises:
homogenizing the cast ingot;
carrying out hot rolling on the homogenized cast ingot to obtain a hot rolled blank; wherein the initial rolling temperature of the hot rolling is 550-570 ℃;
carrying out rough rolling on the hot rolled blank to obtain a rough rolled blank;
carrying out finish rolling on the rough rolling blank to obtain an aluminum coil;
and continuously annealing the aluminum coil to obtain a finished product.
In some embodiments of the invention, the annealing temperature of the continuous annealing is 430-460 ℃, and the running speed of the aluminum coil is 5-7 m/min.
In some embodiments of the invention, the homogenization temperature is 595-610 ℃, the holding time is 12-14 h, and the temperature is reduced to 550-570 ℃ after the holding is finished.
In some embodiments of the invention, the finishing temperature of the hot rolling is 340 ℃ to 360 ℃.
In some embodiments of the invention, the smelting temperature of the ingot is 740-760 ℃, the electromagnetic stirring is carried out for 2-3 times during smelting, each time lasts 10-12 min, the refining temperature is 730-750 ℃, the refining time is 15-20 min, and the casting temperature is 695-705 ℃.
The invention also aims to provide a new energy power battery case which comprises the aluminum alloy.
The aluminum alloy provided by the invention has good plastic deformation capability and can meet the requirements of deep drawing performance and surface quality of battery cases. The invention adopts a mode of direct hot rolling after homogenization, the initial rolling temperature is above 550 ℃, the final rolling temperature is correspondingly improved, the static recrystallization of the material after the hot rolling is finished is more sufficient, and the structure is more uniform. By adopting a continuous annealing mode, the temperature rise speed of the material is high in the recrystallization annealing process, and fine isometric crystal grains can be obtained. The new energy power battery shell has excellent performance.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a process flow diagram of manufacturing an aluminum alloy for a new energy power battery case according to an embodiment of the present invention.
Fig. 2 is a polarization diagram of a grain structure of an aluminum alloy for a new energy power battery case according to an embodiment of the present invention.
Fig. 3 is a polarization diagram of a grain structure of an aluminum alloy for a new energy power battery case according to an embodiment of the present invention.
FIG. 4 is a polarization diagram of the grain structure of the aluminum alloy for new energy power battery case according to an embodiment of the present invention.
FIG. 5 is a polarization diagram of the grain structure of the aluminum alloy for a new energy power battery case according to an embodiment of the present invention.
FIG. 6 is a diagram of a crystal grain structure polarized light of an aluminum alloy for a new energy power battery case according to a comparative example of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The invention provides an aluminum alloy for a new energy power battery shell, which comprises the following components in percentage by weight: si: 0.17% -0.30%, Fe: 0.50-0.60%, Cu: 0.02% -0.08%, Mn: 0.90% -1.05%, Mg: 0.02% -0.06%, Zn: less than or equal to 0.05 percent, Ti: 0.015-0.04%, the balance of Al and single elements less than 0.05%, and inevitable impurities with the total amount less than 0.15%.
The elongation of the aluminum alloy for the new energy power battery shell is more than 40%, and the cupping value is more than 12.5mm, so that the aluminum alloy has good plastic deformation capability. The crystal grains are fine and uniform, the average crystal grain size is less than 30 mu m, and the material has excellent deep drawing performance.
The method for manufacturing the aluminum alloy can comprise the following steps:
(1) homogenizing the ingot.
In some embodiments of the invention, the ingot may be placed into a homogenizing furnace for homogenization. Wherein the homogenization temperature is 595-610 ℃, the heat preservation time is 12-14 h, and the temperature is reduced to 550-570 ℃ after the heat preservation is finished.
(2) And hot rolling the homogenized cast ingot to obtain a hot rolled blank.
In some embodiments of the invention, the hot rolling is performed at a start rolling temperature of 550 ℃ to 570 ℃ and a finish rolling temperature of 340 ℃ to 360 ℃. Hot rolling can be carried out on a four-roll reversing hot mill.
The invention adopts a mode of direct hot rolling after homogenization, the initial rolling temperature is above 550 ℃, the final rolling temperature is correspondingly improved, the static recrystallization of the material after the hot rolling is finished is more sufficient, and the structure is more uniform.
(3) And carrying out rough rolling on the hot rolled blank to obtain a rough rolled blank.
(4) And (5) performing finish rolling on the rough rolling blank to obtain an aluminum coil.
In some embodiments of the invention, the rough rolling and finish rolling may be performed on a cold rolling mill.
(5) And continuously annealing the aluminum coil to obtain a finished product.
In some embodiments of the invention, the annealing temperature of the continuous annealing is 430-460 ℃, and the running speed of the aluminum coil is 5-7 m/min.
If the length of the aluminum coil is 120m, the aluminum coil can be continuously annealed within about 20min, and the temperature rise speed of the aluminum coil is high in the recrystallization annealing process, so that fine isometric crystal grains can be obtained.
In some embodiments of the invention, when the ingot is prepared, the smelting temperature is 740-760 ℃, the electromagnetic stirring is carried out for 2-3 times during smelting, each time lasts 8-12 min, the refining temperature is 730-750 ℃, the refining time is 15-20 min, and the casting temperature is 695-705 ℃.
The new energy power battery shell made of the aluminum alloy has excellent deep drawing performance, and the molded surface is clean and has no scratch and burr, and no oil stain and aluminum scrap residue after cleaning.
The present invention will be described below with reference to specific examples. The values of the process conditions taken in the following examples are exemplary and ranges of values are provided as indicated in the foregoing summary, and reference may be made to conventional techniques for process parameters not specifically noted. The detection methods used in the following examples are all conventional in the industry.
Example 1
The aluminum alloy for the new energy power battery shell manufactured in the embodiment comprises the following components in percentage by weight: si: 0.30%, Fe: 0.55%, Cu: 0.05%, Mn: 1.05%, Mg: 0.05%, Zn: 0.03%, Ti: 0.04%, the balance of Al and single elements less than 0.05%, and inevitable impurities less than 0.15% in total.
The manufacturing method shown in fig. 1 is specifically as follows:
(1) casting: adding the raw materials into a smelting furnace according to the weight percentage of the components, wherein the smelting temperature is 760 ℃, the electromagnetic stirring is carried out for 3 times, each time is 10 minutes, the refining temperature is 750 ℃, the refining time is 20 minutes, and the casting temperature is 705 ℃.
(2) Sawing: the head of the ingot with the thickness of 550mm, the width of 1400mm and the length of 7200mm is sawed by 200mm, the tail of the ingot is sawed by 100mm, the length of the ingot after sawing is 6900mm, the thickness of 550mm and the width of 1400 mm.
(3) Milling a surface: milling the surface of the sawed cast ingot, wherein the milling amount of a single surface is 10mm, the thickness of the cast ingot after surface milling is 530mm, the width is 1400mm, and the length is 6900 mm.
(4) Homogenizing: and (3) placing the milled ingot into a homogenizing heating furnace, homogenizing at 600 ℃, preserving heat for 14h, and cooling to 570 ℃ after heat preservation.
(5) Hot rolling: and rolling the homogenized cast ingot on a four-roller reversible hot rolling mill to obtain a hot rolled blank with the thickness of 8.0mm, wherein the start rolling temperature is 570 ℃, and the finish rolling temperature is 360 ℃.
(6) Rough rolling: the hot rolled stock of 8.0mm thickness was rolled to 5.0mm aluminium coils in 1 pass on a cold rolling mill.
(7) Finish rolling: and (3) rolling the 5.0mm aluminum coil on a cold rolling mill for 1 pass to obtain the 3.0mm aluminum coil.
(8) And (3) continuous annealing: and (3) placing the 3.0mm aluminum coil on a continuous annealing production line for annealing, wherein the annealing temperature is 460 ℃, and the running speed of the aluminum coil is 6m/min, so as to obtain a finished product.
FIG. 2 is a polarization diagram of the grain structure of the aluminum alloy prepared in this example. The remaining properties are reported in Table 1.
Example 2
The aluminum alloy for the new energy power battery shell manufactured in the embodiment comprises the following components in percentage by weight: si: 0.17%, Fe: 0.60%, Cu: 0.08%, Mn: 0.90%, Mg: 0.02%, Zn: 0.01%, Ti: 0.02%, the balance of Al and inevitable impurities with single elements less than 0.05% and the total amount less than 0.15%.
The manufacturing method shown in fig. 1 is specifically as follows:
(1) casting: the raw materials are added into a smelting furnace according to the weight percentage, the smelting temperature is 740 ℃, the electromagnetic stirring is carried out for 2 times, each time is 12 minutes, the refining temperature is 730 ℃, the refining time is 15 minutes, and the casting temperature is 695 ℃.
(2) Sawing: the head of the ingot with the thickness of 550mm, the width of 1400mm and the length of 7200mm is sawed by 200mm, the tail of the ingot is sawed by 100mm, the length of the ingot after sawing is 6900mm, the thickness of 550mm and the width of 1400 mm.
(3) Milling a surface: milling the surface of the sawed cast ingot, wherein the milling amount of a single surface is 10mm, the thickness of the cast ingot after surface milling is 530mm, the width is 1400mm, and the length is 6900 mm.
(4) Homogenizing: and (3) placing the milled ingot into a homogenizing heating furnace, homogenizing at 600 ℃, preserving heat for 12 hours, and cooling to 550 ℃ after heat preservation.
(5) Hot rolling: and rolling the homogenized cast ingot on a four-roller reversible hot rolling mill to obtain a hot rolled blank with the thickness of 8.0mm, wherein the initial rolling temperature is 550 ℃ and the final rolling temperature is 340 ℃.
(6) Rough rolling: the hot rolled stock of 8.0mm thickness was rolled to 5.0mm aluminium coils in 1 pass on a cold rolling mill.
(7) Finish rolling: and (3) rolling the 5.0mm aluminum coil on a cold rolling mill for 1 pass to obtain the 3.0mm aluminum coil.
(8) And (3) continuous annealing: and (3) placing the 3.0mm aluminum coil on a continuous annealing production line for annealing, wherein the annealing temperature is 430 ℃, and the running speed of the aluminum coil is 5m/min, so as to obtain a finished product.
FIG. 3 is a polarization diagram of the grain structure of the aluminum alloy prepared in this example. The remaining properties are reported in Table 1.
Example 3
The aluminum alloy for the new energy power battery shell manufactured in the embodiment comprises the following components in percentage by weight: si: 0.20%, Fe: 0.50%, Cu: 0.02%, Mn: 0.92%, Mg: 0.03%, Zn: 0.04%, Ti: 0.03 percent, the balance of Al and inevitable impurities with single elements less than 0.05 percent and the total amount less than 0.15 percent.
The manufacturing method shown in fig. 1 is specifically as follows:
(1) casting: adding the raw materials into a smelting furnace according to the weight percentage of each component, wherein the smelting temperature is 750 ℃, the electromagnetic stirring is carried out for 3 times, each time is 8 minutes, the refining temperature is 740 ℃, the refining time is 15 minutes, and the casting temperature is 700 ℃.
(2) Sawing: the head of the ingot with the thickness of 550mm, the width of 1400mm and the length of 7200mm is sawed by 200mm, the tail of the ingot is sawed by 100mm, the length of the ingot after sawing is 6900mm, the thickness of 550mm and the width of 1400 mm.
(3) Milling a surface: milling the surface of the sawed cast ingot, wherein the milling amount of a single surface is 10mm, the thickness of the cast ingot after surface milling is 530mm, the width is 1400mm, and the length is 6900 mm.
(4) Homogenizing: and (3) placing the milled ingot into a homogenizing heating furnace, homogenizing at 600 ℃, preserving heat for 12 hours, and cooling to 560 ℃ after heat preservation.
(5) Hot rolling: and rolling the homogenized cast ingot on a four-roller reversible hot rolling mill to obtain a hot rolled blank with the thickness of 8.0mm, wherein the initial rolling temperature is 560 ℃, and the final rolling temperature is 350 ℃.
(6) Rough rolling: the hot rolled stock of 8.0mm thickness was rolled to 5.0mm aluminium coils in 1 pass on a cold rolling mill.
(7) Finish rolling: and (3) rolling the 5.0mm aluminum coil on a cold rolling mill for 1 pass to obtain the 3.0mm aluminum coil.
(8) And (3) continuous annealing: and (3) placing the 3.0mm aluminum coil on a continuous annealing production line for annealing, wherein the annealing temperature is 450 ℃, and the running speed of the aluminum coil is 7m/min, so as to obtain a finished product.
FIG. 4 is a polarization diagram of the grain structure of the aluminum alloy prepared in this example. The remaining properties are reported in Table 1.
Example 4
The aluminum alloy for the new energy power battery shell manufactured in the embodiment comprises the following components in percentage by weight: si: 0.30%, Fe: 0.55%, Cu: 0.08%, Mn: 1.05%, Mg: 0.06%, Ti: 0.025%, the balance of Al and inevitable impurities with less than 0.05% of single elements and less than 0.15% of total amount.
The manufacturing method shown in fig. 1 is specifically as follows:
(1) casting: adding the raw materials into a smelting furnace according to the weight percentage of the components, wherein the smelting temperature is 740 ℃, the electromagnetic stirring is carried out for 3 times, each time is 11 minutes, the refining temperature is 730 ℃, the refining time is 20 minutes, and the casting temperature is 700 ℃.
(2) Sawing: the head of the ingot with the thickness of 550mm, the width of 1400mm and the length of 7200mm is sawed by 200mm, the tail of the ingot is sawed by 100mm, the length of the ingot after sawing is 6900mm, the thickness of 550mm and the width of 1400 mm.
(3) Milling a surface: milling the surface of the sawed cast ingot, wherein the milling amount of a single surface is 10mm, the thickness of the cast ingot after surface milling is 530mm, the width is 1400mm, and the length is 6900 mm.
(4) Homogenizing: and (4) placing the milled ingot into a homogenizing heating furnace, homogenizing at 610 ℃, preserving heat for 14 hours, and cooling to 555 ℃ after heat preservation.
(5) Hot rolling: and rolling the homogenized cast ingot on a four-roller reversible hot rolling mill to obtain a hot rolled blank with the thickness of 8.0mm, wherein the initial rolling temperature is 555 ℃, and the final rolling temperature is 345 ℃.
(6) Rough rolling: the hot rolled stock of 8.0mm thickness was rolled to 5.0mm aluminium coils in 1 pass on a cold rolling mill.
(7) Finish rolling: and (3) rolling the 5.0mm aluminum coil on a cold rolling mill for 1 pass to obtain the 3.0mm aluminum coil.
(8) And (3) continuous annealing: and (3) placing the 3.0mm aluminum coil on a continuous annealing production line for annealing, wherein the annealing temperature is 455 ℃, and the running speed of the aluminum coil is 6m/min, so as to obtain a finished product.
FIG. 5 is a polarization diagram of the grain structure of the aluminum alloy prepared in this example. The remaining properties are reported in Table 1.
Comparative example
The comparative example is an aluminum alloy for the existing new energy power battery shell, is produced by 3003 alloy, and comprises the following components in percentage by weight:
si: 0.52%, Fe: 0.49%, Cu: 0.11%, Mn: 1.15%, Mg: 0.008%, Ti: 0.034%, the balance of Al and inevitable impurities with less than 0.05% of single elements and less than 0.15% of total amount.
FIG. 6 is a polarization diagram of the grain structure of the aluminum alloy of this comparative example. The remaining properties are reported in Table 1.
TABLE 1 Properties of aluminum alloys of examples and comparative examples
Appearance was observed visually whether there was a scratch on the surface of the case and the R-angle of the bottom of the case after the aluminum alloys of examples 1 to 4 and comparative example were formed into the case.
As can be seen from fig. 6, the existing aluminum alloy for the new energy power battery case has larger crystal grains with the average grain size of more than 80 μm, while the aluminum alloy of the present disclosure shown in fig. 2 to 5 has fine and uniform crystal grains with the average grain size of less than 30 μm.
As can be seen from Table 1, the existing aluminum alloy for the new energy power battery shell has poor plastic deformation capability and insufficient deep drawing performance, and the shell surface has scratches, the bottom R angle is rough and the appearance quality is poor after molding. The aluminum alloy provided by the invention has the advantages of elongation of more than 40%, cupping value of more than 12.5mm, good plastic deformation capability, good deep drawing performance, smooth surface and bottom R angles of the formed shell, good appearance quality, and greatly reduced times of trimming the die in the production process, thereby greatly improving the production efficiency.
It should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (9)
1. The aluminum alloy for the new energy power battery shell is characterized by comprising the following components in percentage by weight: si: 0.17% -0.30%, Fe: 0.50-0.60%, Cu: 0.02% -0.08%, Mn: 0.90% -1.05%, Mg: 0.02% -0.06%, Zn: less than or equal to 0.05 percent, Ti: 0.015-0.04%, the balance of Al and single elements less than 0.05%, and inevitable impurities with the total amount less than 0.15%.
2. An aluminium alloy according to claim 1, wherein the aluminium alloy has an elongation > 40% and a cupping value > 12.5 mm.
3. An aluminium alloy according to claim 1, wherein the aluminium alloy has an average grain size < 30 μm.
4. A method of manufacturing an aluminium alloy according to any one of claims 1 to 3, comprising the steps of:
homogenizing the cast ingot;
carrying out hot rolling on the homogenized cast ingot to obtain a hot rolled blank; wherein the initial rolling temperature of the hot rolling is 550-570 ℃;
carrying out rough rolling on the hot rolled blank to obtain a rough rolled blank;
carrying out finish rolling on the rough rolling blank to obtain an aluminum coil;
and continuously annealing the aluminum coil to obtain a finished product.
5. The method of claim 4, wherein the annealing temperature of the continuous annealing is 430-460 ℃ and the running speed of the aluminum coil is 5-7 m/min.
6. The method according to claim 4, wherein the homogenization temperature is 595-610 ℃, the holding time is 12-14 h, and the temperature is reduced to 550-570 ℃ after the holding is finished.
7. The method according to claim 4, wherein the hot rolling has a finishing temperature of 340 ℃ to 360 ℃.
8. The method according to claim 4, wherein the smelting temperature of the ingot is 740-760 ℃, the electromagnetic stirring is carried out for 2-3 times during smelting, each time lasts 10-12 min, the refining temperature is 730-750 ℃, the refining time is 15-20 min, and the casting temperature is 695-705 ℃.
9. A new energy power battery case, characterized by comprising the aluminum alloy of any one of claims 1 to 3.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022258457A1 (en) | 2021-06-11 | 2022-12-15 | Constellium Rolled Products Singen Gmbh & Co.Kg | Aluminum alloy plate sheet for parallelepiped battery housing |
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| CN103409668A (en) * | 2013-08-05 | 2013-11-27 | 苏州有色金属研究院有限公司 | Al-Mn alloy for lithium-ion battery shell |
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| JPS56142844A (en) * | 1980-04-09 | 1981-11-07 | Showa Alum Corp | Aluminum alloy for plate excellent in formability and corrosion resistance |
| CN101469386A (en) * | 2007-04-12 | 2009-07-01 | 日本轻金属株式会社 | Aluminum alloy sheet for battery cover and its production method |
| CN103409668A (en) * | 2013-08-05 | 2013-11-27 | 苏州有色金属研究院有限公司 | Al-Mn alloy for lithium-ion battery shell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022258457A1 (en) | 2021-06-11 | 2022-12-15 | Constellium Rolled Products Singen Gmbh & Co.Kg | Aluminum alloy plate sheet for parallelepiped battery housing |
| FR3123922A1 (en) | 2021-06-11 | 2022-12-16 | Constellium Rolled Products Singen | Aluminum alloy heavy plate for parallelepipedic battery box |
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