Aluminum-based alloy for manufacturing prismatic battery case, prismatic battery case manufactured therefrom, and method for manufacturing same

Abstract

The present invention relates to an aluminum-based alloy for manufacturing a prismatic battery case, a prismatic battery case manufactured therefrom, and a method for manufacturing same. More specifically, the present invention relates to an aluminum-based alloy for manufacturing a prismatic battery case, which has not only excellent mechanical strength but also excellent weldability, and thus is suitable as a material for manufacturing a prismatic battery case through an extrusion process.

Description

Aluminum-based alloy for manufacturing prismatic battery cases, prismatic battery cases manufactured therefrom, and methods for manufacturing the same

[0001] The present invention relates to an aluminum-based alloy for manufacturing a prismatic battery case, a prismatic battery case manufactured therefrom, and a method for manufacturing the same. More specifically, the invention relates to an aluminum-based alloy for manufacturing a prismatic battery case that is suitable as a material for manufacturing a prismatic battery case through an extrusion process, as it not only has excellent mechanical strength but also excellent weldability.

[0002] Although lithium-ion rechargeable batteries are widely used as power sources for devices such as mobile phones and laptop computers, they have recently begun to be adopted as power sources for electric and hybrid vehicles due to their excellent characteristics. For the prismatic battery case (hereinafter referred to as the prismatic battery case), which serves as the exterior of this rechargeable battery, aluminum alloy plates are used to satisfy requirements such as miniaturization and weight reduction of the battery, as well as formability for forming into a prismatic battery case (mainly the prismatic battery case body).

[0003] Prismatic battery cases are generally manufactured by applying press processing (deep drawing and ironing) to aluminum alloy plates, and after inserting electrode materials (electrodes and electrolyte), they are laser welded to a cap member.

[0004] The reality is that deep drawing forming technology offers few advantages for application to battery cell cases, aside from the ability to form thin sheet materials seamlessly. The limitations of the deep drawing method lead to limitations in the design of the entire battery system, extending from cell to module to pack. As components that need to be flexibly adapted to the requirements of products using prismatic batteries are hindering the growth of the entire battery market, the development of alternative technologies is urgently needed.

[0005] Meanwhile, if a prismatic battery case is manufactured through an extrusion process, it has the advantages of not only easy shape realization but also excellent productivity. However, in order to perform an extrusion process on a material for manufacturing a prismatic battery case, it must have excellent extrusion moldability as well as excellent weldability. In addition, since the material for the prismatic battery case must possess mechanical properties above a certain level, there is a need to develop a material for the prismatic battery case that can satisfy all these conditions.

[0006] The present invention has been devised in consideration of the above-mentioned points, and aims to provide an aluminum-based alloy for manufacturing prismatic battery cases that is suitable as a material for manufacturing prismatic battery cases through an extrusion process, having excellent mechanical strength as well as excellent weldability, a prismatic battery case manufactured therefrom, and a method for manufacturing the same.

[0007] To solve the above-mentioned problem, the aluminum-based alloy for manufacturing a rectangular battery case according to the present invention may include silicon (Si), iron (Fe), copper (Cu), manganese (Mn), magnesium (Mg), and aluminum (Al).

[0008] In a preferred embodiment of the present invention, the aluminum-based alloy for manufacturing a rectangular battery case of the present invention may comprise, based on the total weight%, 0.20 to 0.50 weight% of iron (Fe), 0.05 to 0.25 weight% of copper (Cu), and 0.10 to 0.30 weight% of manganese (Mn).

[0009] In a preferred embodiment of the present invention, the aluminum-based alloy for manufacturing a rectangular battery case of the present invention may comprise, based on the total weight%, 0.50 to 0.90 weight% silicon (Si), 0.20 to 0.50 weight% iron (Fe), 0.05 to 0.25 weight% copper (Cu), and 0.10 to 0.30 weight% manganese (Mn).

[0010] In a preferred embodiment of the present invention, the aluminum-based alloy for manufacturing a rectangular battery case of the present invention may comprise, based on the total weight%, 0.50 to 0.90 wt% silicon (Si), 0.20 to 0.50 wt% iron (Fe), 0.05 to 0.25 wt% copper (Cu), 0.10 to 0.30 wt% manganese (Mn), 0.10 to 0.20 wt% magnesium (Mg), and the remainder being aluminum (Al).

[0011] In a preferred embodiment of the present invention, the aluminum-based alloy for manufacturing a rectangular battery case of the present invention may comprise, based on the total weight%, 0.73 to 0.77 wt% silicon (Si), 0.38 to 0.42 wt% iron (Fe), 0.11 to 0.14 wt% copper (Cu), 0.16 to 0.19 wt% manganese (Mn), 0.155 to 0.165 wt% magnesium (Mg), and the remainder being aluminum (Al).

[0012] In a preferred embodiment of the present invention, the aluminum-based alloy for manufacturing a rectangular battery case of the present invention may have an average grain size of 100 to 150 μm.

[0013] Meanwhile, the prismatic battery case of the present invention may be manufactured from an aluminum-based alloy for manufacturing the prismatic battery case of the present invention.

[0014] In a preferred embodiment of the present invention, the prismatic battery case of the present invention can be manufactured by extruding an aluminum-based alloy for manufacturing the prismatic battery case.

[0015] Furthermore, the method for manufacturing a prismatic battery case according to the present invention comprises a first step of preparing an aluminum-based alloy for manufacturing a prismatic battery case and a second step of manufacturing a prismatic battery case by performing an extrusion process on the aluminum-based alloy for manufacturing a prismatic battery case, and may include aluminum-based silicon (Si), iron (Fe), copper (Cu), manganese (Mn), magnesium (Mg), and aluminum (Al) for manufacturing a prismatic battery case prepared in the first step.

[0016] In a preferred embodiment of the present invention, the second step may include the step of melting an aluminum-based alloy for manufacturing a prismatic battery case, performing an extrusion process to produce an extruded product, and curing and cooling the extruded product to produce a prismatic hollow body with open top and bottom ends, and the step of drawing the aluminum-based alloy for manufacturing a prismatic battery case to produce a sealing member corresponding to the bottom of the hollow body, and combining the hollow body and the sealing member and then joining them to produce a prismatic battery case.

[0017] In a preferred embodiment of the present invention, the aluminum-based alloy for manufacturing a rectangular battery case prepared in the first step may comprise, based on the total weight%, 0.50 to 0.90 wt% silicon (Si), 0.20 to 0.50 wt% iron (Fe), 0.05 to 0.25 wt% copper (Cu), 0.10 to 0.30 wt% manganese (Mn), 0.10 to 0.20 wt% magnesium (Mg), and the remainder being aluminum (Al).

[0018] In a preferred embodiment of the present invention, the aluminum-based alloy for manufacturing a rectangular battery case prepared in the first step may comprise, based on the total weight%, 0.73 to 0.77 wt% silicon (Si), 0.38 to 0.42 wt% iron (Fe), 0.11 to 0.14 wt% copper (Cu), 0.16 to 0.19 wt% manganese (Mn), 0.155 to 0.165 wt% magnesium (Mg), and the remainder being aluminum (Al).

[0019] In a preferred embodiment of the present invention, the aluminum-based alloy for manufacturing a prismatic battery case prepared in the first step may be manufactured by including a first step of melting and molten aluminum (Al) ingots to produce molten aluminum, and melting and molten silicon (Si) ingots, iron (Fe) ingots, copper (Cu) ingots, manganese (Mn) ingots, and magnesium (Mg) ingots in the molten aluminum to produce molten aluminum for manufacturing an aluminum-based alloy, and a second step of casting the molten aluminum for manufacturing an aluminum-based alloy for manufacturing a prismatic battery case.

[0020] The aluminum-based alloy for manufacturing a prismatic battery case according to the present invention, the prismatic battery case manufactured therefrom, and the method for manufacturing the same not only have excellent mechanical strength but also excellent weldability, making them suitable as materials for manufacturing a prismatic battery case through an extrusion process.

[0021] Figure 1 is a figure showing the grain size of the aluminum-based alloy for manufacturing a rectangular battery case prepared in Example 1 using an image analyzer.

[0022] FIG. 2 is a perspective view illustrating a rectangular battery case according to a preferred embodiment of the present invention.

[0023] Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. In the drawings, parts unrelated to the explanation have been omitted to clearly explain the present invention, and the same reference numerals are assigned to identical or similar components throughout the specification.

[0024]

[0025] Referring to FIG. 2, the prismatic battery case of the present invention is provided with a prismatic hollow body with the top and bottom open, a battery cell is placed in the hollow body, and the case is sealed by covering it with a cap having terminals on the top and bottom of the hollow body.

[0026]

[0027] The prismatic battery case of the present invention can be manufactured from an aluminum-based alloy for manufacturing the prismatic battery case of the present invention.

[0028] The top of the prismatic battery case of the present invention is a portion into which an electrode material (electrode and electrolyte) is loaded into the prismatic battery case, and after the electrode material (electrode and electrolyte) is loaded, it can be welded to the cap member of the prismatic battery. Therefore, the material used to manufacture the prismatic battery case must have excellent weldability, and the present invention has excellent weldability that satisfies this requirement by using the aluminum-based alloy for manufacturing the prismatic battery case of the present invention to manufacture the prismatic battery case.

[0029] In addition, the prismatic battery case of the present invention can be manufactured by extruding the aluminum-based alloy for manufacturing the prismatic battery case of the present invention. Therefore, the material used to manufacture the prismatic battery case must have excellent extrusion moldability, and the present invention possesses excellent extrusion moldability capable of satisfying such requirements by using the aluminum-based alloy for manufacturing the prismatic battery case of the present invention to manufacture the prismatic battery case.

[0030]

[0031] Meanwhile, the aluminum-based alloy for manufacturing a rectangular battery case according to the present invention may include silicon (Si), iron (Fe), copper (Cu), manganese (Mn), magnesium (Mg), and aluminum (Al).

[0032] Specifically, the aluminum-based alloy for manufacturing a prismatic battery case according to the present invention may contain 0.10 to 0.30 weight% of manganese (Mn) with respect to the total weight%, preferably 0.15 to 0.20 weight%, more preferably 0.16 to 0.19 weight%, and even more preferably 0.17 to 0.18 weight%. If the weight% range is exceeded, at least one of the technical features among extrusion formability, weldability, and mechanical strength may be degraded, and there may be a problem that the material is unsuitable for use in manufacturing a prismatic battery case through an extrusion process.

[0033] In addition, the aluminum-based alloy for manufacturing a prismatic battery case according to the present invention may contain 0.10 to 0.20 weight% of magnesium (Mg), preferably 0.15 to 0.17 weight%, and more preferably 0.155 to 0.165 weight% based on the total weight%. If the weight% range is exceeded, at least one of the technical features among extrusion formability, weldability, and mechanical strength may be degraded, and there may be a problem that the material is unsuitable for use in manufacturing a prismatic battery case through an extrusion process.

[0034] In addition, the aluminum-based alloy for manufacturing a prismatic battery case according to the present invention may contain silicon (Si) in an amount of 0.50 to 0.90 weight%, preferably 0.70 to 0.80 weight%, more preferably 0.72 to 0.78 weight%, and even more preferably 0.73 to 0.77 weight% based on the total weight%. If the amount falls outside this weight% range, at least one of the technical features among extrusion formability, weldability, and mechanical strength may be degraded, and there may be a problem that the material is unsuitable for use in manufacturing a prismatic battery case through an extrusion process.

[0035] In addition, the aluminum-based alloy for manufacturing a prismatic battery case according to the present invention may contain 0.20 to 0.50 weight% of iron (Fe) with respect to the total weight%, preferably 0.35 to 0.45 weight%, more preferably 0.37 to 0.43 weight%, even more preferably 0.38 to 0.42 weight%, and even more preferably 0.39 to 0.41 weight%. If the weight% range is exceeded, at least one of the technical features among extrusion formability, weldability, and mechanical strength may be degraded, and there may be a problem that the material is unsuitable for use in manufacturing a prismatic battery case through an extrusion process.

[0036] In addition, the aluminum-based alloy for manufacturing a prismatic battery case according to the present invention may contain 0.05 to 0.25 weight% of copper (Cu) with respect to the total weight%, preferably 0.10 to 0.15 weight%, more preferably 0.11 to 0.14 weight%, and even more preferably 0.12 to 0.13 weight%. If the weight% is outside this range, at least one of the technical features among extrusion formability, weldability, and mechanical strength may be degraded, and there may be a problem that the material is unsuitable for use in manufacturing a prismatic battery case through an extrusion process.

[0037] In addition, the aluminum-based alloy for manufacturing a rectangular battery case according to the present invention may contain aluminum (Al) as a residual content.

[0038] Furthermore, the aluminum-based alloy for manufacturing a rectangular battery case according to the present invention may have an average grain size of 100 to 150 μm.

[0039]

[0040] Meanwhile, the method for manufacturing an aluminum-based alloy for manufacturing a rectangular battery case according to the present invention may include a first step and a second step.

[0041] First, the first step of the method for manufacturing an aluminum-based alloy for manufacturing a rectangular battery case according to the present invention involves melting and treating an aluminum (Al) ingot to produce a molten aluminum, and then melting and treating a silicon (Si) ingot, an iron (Fe) ingot, a copper (Cu) ingot, a manganese (Mn) ingot, and a magnesium (Mg) ingot in the molten aluminum to produce a molten aluminum alloy.

[0042] Next, the second step of the method for manufacturing an aluminum-based alloy for manufacturing a prismatic battery case according to the present invention may involve casting the molten aluminum-based alloy prepared in the first step to manufacture an aluminum-based alloy for manufacturing a prismatic battery case. At this time, the casting may be performed using the DC casting method (Direct Chill Casting method).

[0043] In addition, the aluminum-based alloy for manufacturing a prismatic battery case produced in the second step comprises, with respect to the total weight%, silicon (Si) 0.50 to 0.90 wt%, preferably 0.70 to 0.80 wt%, more preferably 0.72 to 0.78 wt%, even more preferably 0.73 to 0.77 wt%, iron (Fe) 0.20 to 0.50 wt%, preferably 0.35 to 0.45 wt%, more preferably 0.37 to 0.43 wt%, even more preferably 0.38 to 0.42 wt%, even more preferably 0.39 to 0.41 wt%, copper (Cu) 0.05 to 0.25 wt%, preferably 0.10 to 0.15 wt%, more preferably 0.11 to 0.14 wt%, and even more preferably 0.12 to 0.13 wt%. It may contain 0.10 to 0.30 wt% manganese (Mn), preferably 0.15 to 0.20 wt%, more preferably 0.16 to 0.19 wt%, even more preferably 0.17 to 0.18 wt%, magnesium (Mg) 0.10 to 0.20 wt%, preferably 0.15 to 0.17 wt%, more preferably 0.155 to 0.165 wt%, and aluminum (Al) as the remainder.

[0044]

[0045] Furthermore, the method for manufacturing a rectangular battery case of the present invention includes a first step and a second step.

[0046] First, the first step of the method for manufacturing a prismatic battery case according to the present invention may be to prepare an aluminum-based alloy for manufacturing a prismatic battery case. At this time, the aluminum-based alloy for manufacturing a prismatic battery case is as described above.

[0047] Next, the second step of the method for manufacturing a prismatic battery case according to the present invention may manufacture a prismatic battery case by performing an extrusion process on the aluminum-based alloy for manufacturing a prismatic battery case prepared in the first step.

[0048] Specifically, the second step of the method for manufacturing a prismatic battery case according to the present invention may involve melting the aluminum-based alloy for manufacturing a prismatic battery case prepared in the first step, then performing an extrusion process in which the alloy is fed into an extrusion mold and extruded to produce an extruded product, and then curing and cooling the extruded product to produce a prismatic hollow body with open top and bottom ends. Additionally, the aluminum-based alloy for manufacturing a prismatic battery case prepared in the first step may be drawn to produce a rectangular sealing member corresponding to the bottom of the hollow body, and the prismatic battery case may be manufactured by combining the hollow body and the sealing member and then joining them.

[0049]

[0050] Although the present invention has been described above with reference to embodiments, this is merely illustrative and does not limit the embodiments of the present invention. Those skilled in the art will understand that various modifications and applications not exemplified above are possible within the scope of the essential characteristics of the present invention. For example, each component specifically shown in the embodiments of the present invention may be modified and implemented. Furthermore, differences related to such modifications and applications should be interpreted as being included within the scope of the present invention as defined in the appended claims.

[0051]

[0052] Example 1: Preparation of an aluminum-based alloy for manufacturing a prismatic battery case

[0053] (1) Aluminum (Al) ingots were melted and molten to produce an aluminum molten metal, silicon (Si) ingots, iron (Fe) ingots, copper (Cu) ingots, manganese (Mn) ingots and magnesium (Mg) ingots were dissolved in the produced aluminum molten metal, and then molten metal was treated (electronic molten metal stirring was performed) to produce a molten metal for making an aluminum-based alloy.

[0054] (2) A DC casting method (Direct Chill Casting method) was performed on the molten metal for manufacturing the aluminum alloy to cast a cylindrical (diameter: 80 mm, height: 200 mm) aluminum alloy for a prismatic battery case. At this time, the aluminum alloy for the prismatic battery case manufactured contained 0.75 wt% silicon (Si), 0.4 wt% iron (Fe), 0.125 wt% copper (Cu), 0.175 wt% manganese (Mn), 0.16 wt% magnesium (Mg), and the remainder being aluminum (Al).

[0055]

[0056] Examples 2 to 12: Preparation of aluminum-based alloys for manufacturing prismatic battery cases

[0057] Aluminum-based alloys for manufacturing prismatic battery cases were each manufactured in the same manner as in Example 1. However, unlike in Example 1, the content of silicon (Si) ingot, iron (Fe) ingot, copper (Cu) ingot, manganese (Mn) ingot, and magnesium (Mg) ingot introduced into the molten aluminum was varied, and aluminum-based alloys for prismatic battery cases containing silicon (Si), iron (Fe), copper (Cu), manganese (Mn), magnesium (Mg), and aluminum (Al) were each cast with the content listed in Table 1.

[0058]

[0059] Experimental Example 1: Measurement of Yield Strength, Tensile Strength, and Elongation

[0060] Tensile tests (yield strength, tensile strength, and elongation) were performed on the aluminum-based alloys for manufacturing prismatic battery cases prepared in Examples 1 to 12, and the results are shown in Table 1 below. The tensile tests were performed using a universal testing machine (DTU-900 MHN, DAEKYUNG TECH, maximum load 10t), and the tests were conducted using specimens prepared according to KS B 0801 13B.

[0061]

[0062] Experimental Example 2: Weldability Measurement

[0063] The weldability of the aluminum-based alloys for manufacturing prismatic battery cases prepared in Examples 1 to 12 was evaluated and is shown in Table 1 below.

[0064] Specifically, a test specimen of size 30 mm × 100 mm was cut from the aluminum-based alloy for manufacturing prismatic battery cases prepared in Examples 1 to 12, and a bead-on-plate weld was performed with a weld length of 90 mm using a welding machine with a CW (continuous oscillation) fiber laser as the heat source. The welding conditions were a laser output of 2.5 to 3.0 kW, a welding speed of 6.0 m / min, and an advance angle of 5 deg., and the laser output was adjusted so that the penetration depth of the weld was 0.4 to 0.5 mm. Weldability was assessed by checking the quality of the welded bead, and it was judged as “○” if the quality was excellent, “△” if the quality was average, and “×” if the quality was poor.

[0065]

[0066] Classification Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Silicon (Weight%) 0.75 0.75 0.75 0.70 8 0.65 Iron (Weight%) 0.4 0.4 0.4 0.4 0.40 45 Copper (Weight%) 0.12 5 0.12 5 0.12 5 0.12 5 0.12 5 0.12 5 0.12 5 Manganese (Weight%) 0.17 5 0.17 5 0.17 5 0.17 5 0.17 5 Magnesium (Weight%) 0.16 0.15 0.18 0.15 0.2 0.13 5 Aluminum (Weight%) Remaining Remaining Remaining Remaining Remaining Yield Strength (N / mm² 2 )171.73167.6171.73145.23180.04127.43 Tensile Strength (N / mm 2)25 6.14 25 8.63 25 6.14 219.19 26 8.35 200.88 Elongation (%) 11.4 8.34 11.4 10.03 10.8 39.57 Weldability ○○△○×○ Classification Example 7 Example 8 Example 9 Example 10 Example 11 Example 12 Silicon (wg) 0.55 0.55 0.55 0.55 0.5 Iron (wg) 0.45 0.45 0.45 0.55 0.6 0.6 Copper (wg) 0.12 5 0.12 5 0.10.07 5 0.10.075 Manganese (wg) 0.25 0.4 0.4 0.65 0.9 1.1 Magnesium (wg) 0.13 5 0.11 0.11 0.10.10.06 Aluminum (wg) Remainder Remainder Remainder Remainder Remainder Yield Strength (N / mm² 2 )115.4594.0589.0587.3681.0567.55 Tensile Strength (N / mm 2 )179.87 146.87 137.63 132.67 122.65 103.71 Elongation(%) 9.33 12.21 10.11 8.91 9.23 10.25 Weldability ○○○○○○

[0067]

[0068] As can be seen in Table 1 above, the aluminum-based alloy for manufacturing a rectangular battery case prepared in Example 1 was found to have excellent weldability, as well as excellent yield strength, tensile strength, and elongation.

[0069] In addition, compared to the aluminum alloy for manufacturing a prismatic battery case manufactured in Example 1, the aluminum alloy for manufacturing a prismatic battery case manufactured in Example 1, which has a different magnesium content, was found to have a lower yield strength as well as a lower elongation.

[0070] In addition, it was confirmed that the aluminum alloy for manufacturing a prismatic battery case manufactured in Example 3, which has a different magnesium content compared to the aluminum alloy for manufacturing a prismatic battery case manufactured in Example 1, showed reduced weldability.

[0071] In addition, compared to the aluminum alloy for manufacturing a prismatic battery case manufactured in Example 1, the aluminum alloy for manufacturing a prismatic battery case manufactured in Example 4, which has different magnesium and silicon content, was found to have reduced yield strength and elongation, as well as reduced tensile strength.

[0072] In addition, it was confirmed that the aluminum alloy for manufacturing a prismatic battery case manufactured in Example 5, which has different magnesium and silicon content compared to the aluminum alloy for manufacturing a prismatic battery case manufactured in Example 1, showed significantly reduced weldability.

[0073] In addition, compared to the aluminum alloy for manufacturing a prismatic battery case manufactured in Example 1, the aluminum alloy for manufacturing a prismatic battery case manufactured in Example 6, which has different magnesium, silicon, and iron content, was found to have significantly lower yield strength and tensile strength, as well as lower elongation.

[0074] In addition, compared to the aluminum alloy for manufacturing a prismatic battery case manufactured in Example 1, the aluminum alloy for manufacturing a prismatic battery case manufactured in Example 7, which has different magnesium, silicon, iron, and manganese content, showed significantly reduced yield strength and tensile strength, as well as reduced elongation, and it was confirmed that the aluminum alloy for manufacturing a prismatic battery case manufactured in Example 8 showed significantly reduced yield strength and tensile strength.

[0075] In addition, compared to the aluminum alloy for manufacturing a prismatic battery case manufactured in Example 1, the aluminum alloys for manufacturing a prismatic battery case manufactured in Examples 9 to 12, which have different contents of magnesium, silicon, iron, manganese, and copper, were found to have significantly reduced yield strength and tensile strength, as well as reduced elongation.

[0076]

[0077] Experimental Example 3: Particle Analysis

[0078] The grain size of the aluminum-based alloy for manufacturing a rectangular battery case prepared in Example 1 was confirmed using an image analyzer and is shown in Fig. 1.

[0079] As can be seen in Figure 1, it was confirmed that the aluminum-based alloy for manufacturing a prismatic battery case prepared in Example 1 had a grain size of 100 to 150 μm.

[0080]

[0081] Preparation Example 1: Preparation of a prismatic battery case

[0082] (1) An aluminum-based alloy for manufacturing a rectangular battery case manufactured in Example 1 was melted so that it could be fed into an extrusion mold, and then an extrusion process was performed to feed it into the extrusion mold and extrude it to produce an extruded product.

[0083] (2) The manufactured extruded material was cured and cooled to produce a rectangular hollow body with dimensions of 110 mm in width x 40 mm in height x 0.8 mm in thickness, with the top and bottom open.

[0084] (3) An aluminum-based alloy for manufacturing a rectangular battery case manufactured in Example 1 was drawn to produce a rectangular sealing member corresponding to the bottom of the hollow body, and a rectangular battery case was manufactured by combining the hollow body and the sealing member and then joining them.

[0085]

[0086] Simple variations or modifications of the present invention can be easily implemented by those skilled in the art, and all such variations or modifications are considered to be included within the scope of the present invention.

Claims

1. An aluminum-based alloy for manufacturing prismatic battery cases, comprising silicon (Si), iron (Fe), copper (Cu), manganese (Mn), magnesium (Mg), and aluminum (Al).

2. In Paragraph 1, The above aluminum-based alloy for manufacturing a prismatic battery case comprises, based on the total weight%, 0.20 to 0.50 weight% of iron (Fe), 0.05 to 0.25 weight% of copper (Cu), and 0.10 to 0.30 weight% of manganese (Mn).

3. In Paragraph 2, The above aluminum-based alloy for manufacturing a prismatic battery case comprises, based on the total weight%, 0.50 to 0.90 wt% silicon (Si), 0.20 to 0.50 wt% iron (Fe), 0.05 to 0.25 wt% copper (Cu), and 0.10 to 0.30 wt% manganese (Mn).

4. In Paragraph 3, The above aluminum-based alloy for manufacturing a prismatic battery case comprises, based on the total weight%, 0.50 to 0.90 wt% silicon (Si), 0.20 to 0.50 wt% iron (Fe), 0.05 to 0.25 wt% copper (Cu), 0.10 to 0.30 wt% manganese (Mn), 0.10 to 0.20 wt% magnesium (Mg), and the remainder being aluminum (Al).

5. In Paragraph 4, The above aluminum-based alloy for manufacturing a prismatic battery case comprises, based on the total weight%, 0.73 to 0.77 wt% silicon (Si), 0.38 to 0.42 wt% iron (Fe), 0.11 to 0.14 wt% copper (Cu), 0.16 to 0.19 wt% manganese (Mn), 0.155 to 0.165 wt% magnesium (Mg), and the remainder being aluminum (Al).

6. In Paragraph 5, The above aluminum-based alloy for manufacturing a prismatic battery case is an aluminum-based alloy for manufacturing a prismatic battery case having an average grain size of 100 to 150 μm.

7. A prismatic battery case manufactured from an aluminum-based alloy for manufacturing the prismatic battery case of claim 1.

8. In Paragraph 7, The above-mentioned prismatic battery case is a prismatic battery case manufactured by extruding an aluminum-based alloy for manufacturing the above-mentioned prismatic battery case.

9. A first step of preparing an aluminum-based alloy for manufacturing a rectangular battery case; and A second step of manufacturing a prismatic battery case by performing an extrusion process on the above-mentioned aluminum-based alloy for manufacturing a prismatic battery case; comprising A method for manufacturing a prismatic battery case comprising aluminum-based silicon (Si), iron (Fe), copper (Cu), manganese (Mn), magnesium (Mg), and aluminum (Al) for manufacturing a prismatic battery case prepared in the first step above.

10. In paragraph 9, the above second step is A step of melting the aluminum-based alloy for manufacturing the above-mentioned prismatic battery case, performing an extrusion process to produce an extruded product, and curing and cooling the extruded product to produce a prismatic hollow body with open top and bottom ends; and A step of manufacturing a rectangular battery case by drawing and forming the above-mentioned aluminum-based alloy for manufacturing the rectangular battery case to produce a sealing member corresponding to the bottom of the above-mentioned hollow body, and then combining the above-mentioned hollow body and the sealing member and joining them to manufacture a rectangular battery case; A method for manufacturing a rectangular battery case comprising 11. In Paragraph 9, A method for manufacturing a prismatic battery case, wherein the aluminum-based alloy prepared in the first step above comprises, based on the total weight%, 0.50 to 0.90 wt% silicon (Si), 0.20 to 0.50 wt% iron (Fe), 0.05 to 0.25 wt% copper (Cu), 0.10 to 0.30 wt% manganese (Mn), 0.10 to 0.20 wt% magnesium (Mg), and the remainder being aluminum (Al).

12. In Paragraph 11, A method for manufacturing a prismatic battery case, wherein the aluminum-based alloy prepared in the first step above comprises, based on the total weight%, 0.73 to 0.77 wt% silicon (Si), 0.38 to 0.42 wt% iron (Fe), 0.11 to 0.14 wt% copper (Cu), 0.16 to 0.19 wt% manganese (Mn), 0.155 to 0.165 wt% magnesium (Mg), and the remainder being aluminum (Al).

13. In claim 9, the aluminum-based alloy for manufacturing a rectangular battery case prepared in the first step above is A first step of preparing a molten aluminum metal by melting and molten aluminum (Al) ingots, and preparing a molten aluminum metal by melting and molten silicon (Si) ingots, iron (Fe) ingots, copper (Cu) ingots, manganese (Mn) ingots, and magnesium (Mg) ingots in the molten aluminum metal; and A second step of manufacturing an aluminum-based alloy for manufacturing a rectangular battery case by casting the molten metal for manufacturing the above aluminum-based alloy; A method for manufacturing a rectangular battery case, including the following.

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