3003 alloy cast-rolled blank and method of making same, 3003 alloy aluminum foil and applications thereof, battery

Abstract

The application relates to a 3003 alloy cast-rolled blank and a preparation method thereof, a 3003 alloy aluminum foil and application and a battery. The 3003 alloy cast-rolled blank comprises the following elements in percentage by mass: Mn: 1.1% to 1.4%, Cu: 0.2% to 0.3%, Ti: 0.01% to 0.028%, Mg: 0 to 0.005%, the total content of Si and Fe: 0.1% to 0.2%, and the balance of aluminum. The above-mentioned cast-rolled blank is synergized by the elements in a specific ratio to obtain a cast-rolled blank which is strengthened by two components and has a uniform structure. The aluminum foil prepared by using the cast-rolled blank has the characteristics of high strength and high elongation.

Description

Technical Field

[0001] This invention relates to the field of aluminum foil processing technology, and in particular to a 3003 alloy cast-rolled billet and its preparation method, 3003 alloy aluminum foil and its applications, and batteries. Background Technology

[0002] With the development of new energy vehicles, the demand for lithium batteries has grown rapidly. As the positive electrode current collector material of mainstream lithium battery products, battery aluminum foil has been widely used, which has also triggered a sharp increase in market demand for aluminum foil.

[0003] As a core component of new energy vehicles, the progressive and rapid development of power batteries and their manufacturing technologies has, on the one hand, supported the industry's needs in various aspects such as driving range, safety, and stability, and on the other hand, placed higher technical requirements on new energy battery foils. For example, battery aluminum foils are required to have higher elongation aluminum ratio performance while maintaining a certain strength. Summary of the Invention

[0004] Therefore, it is necessary to provide a 3003 alloy cast-rolled billet and its preparation method that can improve the elongation and tensile strength of battery aluminum foil.

[0005] Furthermore, a 3003 alloy aluminum foil with high tensile strength and elongation is provided, along with its preparation method and applications, and batteries.

[0006] In a first aspect, this application provides a 3003 alloy cast-rolled billet, comprising the following chemical components by mass percentage: Mn: 1.1%~1.35%, Cu: 0.2%~0.24%, Ti: 0.015%~0.028%, Mg≤0.005%, Si and Fe total content of 0.1%~0.16%, and balance aluminum.

[0007] The aforementioned cast-rolled billet utilizes a specific ratio of elemental components for synergistic modification. Specifically, Mn is used as the first main element and Cu as the second main element to modify the 3003 alloy, while strictly limiting the content of harmful elements such as Ti and Mg, resulting in a bicomponent-strengthened cast-rolled billet with a uniform microstructure. Aluminum foil prepared using this cast-rolled billet exhibits high strength and high elongation.

[0008] Furthermore, when the above-mentioned cast and rolled billets are further processed into battery aluminum foil, the deep processing of battery aluminum foil can be greatly reduced, especially the processing and control difficulty of the foil rolling process.

[0009] In some embodiments, the mass percentage of Cu is 0.21% to 0.24%.

[0010] In some embodiments, the chemical composition of the cast-rolled billet further includes Zn and / or Cr.

[0011] In some embodiments, the total amount of Zn and Cr accounts for 0.002% to 0.01% of the mass of the cast-rolled billet.

[0012] In some embodiments, the cast-rolled billet comprises the following elemental components by mass percentage: Mn: 1.1%~1.35%, Cu: 0.20%~0.24%, Ti: 0.015%~0.028%, Mg: 0.001%~0.003%, Si and Fe total content of 0.1%~0.14%, Zn and Cr total content of 0.005%~0.009%, and the balance aluminum.

[0013] A second aspect of this application provides a method for preparing the 3003 alloy cast-rolled billet provided in the first aspect, comprising the following preparation steps:

[0014] Weigh the raw materials according to the elemental composition of the cast and rolled billet;

[0015] The raw materials are melted and mixed to obtain a mixed melt;

[0016] The mixed melt is subjected to casting and rolling to obtain the cast and rolled billet.

[0017] In some embodiments, the raw materials include aluminum ingots with a purity ≥ 99.8%, Al-Cu master alloys, and Al-Mn master alloys;

[0018] The step of melting and mixing the raw materials includes:

[0019] First, the aluminum ingot is melted to obtain molten aluminum; then, the Al-Cu master alloy and the Al-Mn master alloy are added to the molten aluminum.

[0020] In a third aspect, this application provides a 3003 alloy aluminum foil, which is prepared from the cast-rolled billet described in the first aspect.

[0021] In some embodiments, the thickness of the 3003 alloy aluminum foil is 0.01 mm to 0.02 mm.

[0022] In a fourth aspect, this application provides a method for preparing the 3003 alloy aluminum foil described in the third aspect, comprising the following preparation steps:

[0023] The cast-rolled billet is subjected to cold rolling, intermediate annealing, and foil rolling in sequence.

[0024] The fifth aspect of this application provides the application of the 3003 alloy aluminum foil described in the fourth aspect in the preparation of batteries.

[0025] In a sixth aspect of this application, a battery is provided, comprising the 3003 alloy aluminum foil described in the third aspect. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the disclosed drawings without creative effort.

[0027] Figure 1 The elemental distribution diagram is shown for the cast-rolled billet prepared in Example 1.

[0028] Figure 2 The elemental distribution diagram is shown for the cast-rolled billet prepared in Example 2. Detailed Implementation

[0029] To facilitate understanding of the present invention, a more comprehensive description is provided below, along with preferred embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. It should be understood that these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] The weights of the relevant components mentioned in the embodiments of this invention can refer not only to the specific content of each component, but also to the proportional relationship between the weights of the components. Therefore, any scaling up or down of the content of the relevant components according to the embodiments of this invention is within the scope disclosed in the embodiments of this invention. Specifically, the weights mentioned in the embodiments of this invention can be well-known units of mass in the chemical industry, such as μg, mg, g, and kg.

[0033] In one embodiment of this application, a 3003 alloy cast-rolled billet is provided, which, by mass percentage, comprises the following chemical components: Mn: 1.1%~1.4%, Cu: 0.2%~0.3%, Ti: 0.01%~0.028%, Mg: 0~0.005%, Si and Fe total content of 0.1%~0.2%, and balance aluminum.

[0034] The aforementioned cast-rolled billet utilizes a specific ratio of elemental components for synergistic modification. Specifically, Cu is used as the second main element to modify the 3003 alloy, while the content of harmful elements such as Ti and Mg is strictly limited, resulting in a bicomponent-strengthened cast-rolled billet with a uniform microstructure. Aluminum foil prepared using this cast-rolled billet exhibits high strength and high elongation.

[0035] Furthermore, when the above-mentioned cast and rolled billets are further processed into battery aluminum foil, the deep processing of battery aluminum foil can be greatly reduced, especially the processing and control difficulty of the foil rolling process.

[0036] As an example, the mass percentage of Mn in the 3003 alloy cast-rolled billet can be 1.1%, 1.12%, 1.14%, 1.15%, 1.16%, 1.18%, 1.20%, 1.22%, 1.24%, 1.25%, 1.26%, 1.28%, 1.30%, 1.31%, 1.32%, 1.34%, 1.35%, or 1.4%. Further, the mass percentage of Mn can be a range defined by any two of the above values ​​as endpoints. Preferably, the mass percentage of Mn is 1.1% to 1.35%. More preferably, the mass percentage of Mn is 1.27% to 1.32%.

[0037] As an example, the mass percentage of Cu in the 3003 alloy cast-rolled billet can be 0.2%, 0.21%, 0.215%, 0.22%, 0.225%, 0.23%, 0.235%, 0.24%, 0.25%, 0.26%, 0.27%, 0.28%, 0.29%, or 0.3%. Further, the mass percentage of Cu can be a range defined by any two of the above values ​​as endpoints. Preferably, the mass percentage of Cu is 0.20% to 0.24%. More preferably, the mass percentage of Cu is 0.215% to 0.225%.

[0038] As an example, the mass percentage of Ti in the 3003 alloy cast-rolled billet can be 0.01%, 0.015%, 0.016%, 0.017%, 0.018%, 0.019%, 0.02%, 0.021%, 0.022%, 0.023%, 0.024%, 0.025%, 0.026%, 0.027%, or 0.028%. Further, the mass percentage of Ti can be a range defined by any two of the above values. Preferably, the mass percentage of Ti is 0.015% to 0.028%. Within a reasonable range, Ti can play a role in grain refinement in the alloy, thereby improving the tensile strength and ductility of the alloy. However, Ti is added to the billet as an Al-Ti5-B grain refiner. If the Ti content is too high, TiB precipitate is easily formed, which reduces the grain refinement effect and also reduces the uniformity of the billet's structure, thereby reducing the uniformity of the alloy's structure and reducing the alloy's tensile strength and elongation.

[0039] As an example, the mass percentage of Mg in the 3003 alloy cast-rolled billet can be 0, 0.001%, 0.002%, 0.003%, 0.004%, or 0.005%. Mg is a harmful element, and the lower the mass percentage, the better. Preferably, the mass percentage of Mg is 0.001% to 0.003%.

[0040] As an example, the total Si and Fe content in the 3003 alloy cast-rolled billet is 0.1%, 0.12%, 0.14%, 0.15%, 0.16%, 0.18%, or 0.2%. Further, the total Si and Fe content can be a range defined by any two of the above values ​​as endpoints. Preferably, the total Si and Fe content is 0.1% to 0.14%.

[0041] In some embodiments, the chemical composition of the cast-rolled billet also includes Zn and / or Cr. Both Zn and Cr are classified as hazardous elements, and their presence is considered acceptable as long as the total content does not exceed an upper limit. Therefore, it can be understood that the cast-rolled billet may contain Zn but not Cr, or it may contain Cr but not Zn, or it may contain both Zn and Cr simultaneously.

[0042] In some embodiments, the total amount of Zn and Cr in the cast-rolled billet accounts for 0.002% to 0.01% of the mass. It can be understood that when the cast-rolled billet contains Zn but not Cr, the mass percentage of Zn in the cast-rolled billet is 0.002% to 0.01%. When the cast-rolled billet contains Cr but not Zn, the mass percentage of Cr in the cast-rolled billet is 0.002% to 0.01%. Further, the total amount of Zn and Cr in the cast-rolled billet accounts for 0.005% to 0.01% of the mass.

[0043] In some embodiments, the cast-rolled billet comprises the following elemental components by mass percentage: Mn: 1.1%~1.35%, Cu: 0.20%~0.24%, Ti: 0.015%~0.028%, Mg: 0.001%~0.003%, Si and Fe total content of 0.1%~0.14%, Zn and Cr total content of 0.005%~0.009%, and balance aluminum.

[0044] In some embodiments, the cast-rolled billet also includes essential impurities. The mass content of the essential impurity component is ≤0.001%.

[0045] In some embodiments, the cast-rolled billet is a profile. Preferably, the cast-rolled billet is a sheet.

[0046] In some embodiments, the thickness of the cast-rolled billet plate is 6.5 mm to 7.0 mm.

[0047] In some embodiments, the raw material for preparing the cast-rolled billet includes aluminum ingots with a purity ≥ 99.8%. Further, the purity of the aluminum ingots is ≥ 99.85%. Using high-purity aluminum ingots as the raw material for preparing the cast-rolled billet can further reduce the content of impurity elements in the cast-rolled billet, thereby reducing the content of impurity elements in the 3003 alloy, improving the conductivity of the battery aluminum foil, and reducing impedance.

[0048] In one embodiment of this application, a method for preparing a cast-rolled billet is provided, comprising the following preparation steps S10 to S30.

[0049] S10. Weigh the raw materials according to the elemental composition of the cast-rolled billet.

[0050] S20. The raw materials are melted and mixed to obtain a mixed melt.

[0051] S30. The mixed melt is subjected to casting and rolling to obtain a cast-rolled billet.

[0052] In some embodiments, the raw materials include aluminum ingots with a purity of ≥99.8%, Al-Cu master alloys, and Al-Mn master alloys.

[0053] In some embodiments, the melting temperature in step S20 is 750°C to 790°C.

[0054] In some embodiments, step S20 includes the following steps S21 to S23.

[0055] S21. First, melt aluminum ingots with a purity of ≥99.8% to obtain molten aluminum.

[0056] S22. Add appropriate amounts of Al-Cu master alloy and Al-Mn master alloy to the molten aluminum and mix them together.

[0057] In some embodiments, before step S22, the method further includes testing the chemical composition content in the molten aluminum and determining the amount of Al-Cu master alloy and Al-Mn master alloy to be added based on the chemical composition content in the molten aluminum.

[0058] In some embodiments, in step S21, the melting temperature of the aluminum ingot is 755°C to 785°C.

[0059] In some embodiments, in step S22, when appropriate amounts of Al-Cu master alloy and Al-Mn master alloy are added to the molten aluminum for melting and mixing, the melt temperature is maintained in the range of 750°C to 780°C.

[0060] In some embodiments, in step S22, after adding appropriate amounts of Al-Cu master alloy and Al-Mn master alloy to the molten aluminum, the mixture is stirred for ≥30 min. Further, the stirring time is 30 min to 40 min. Stirring allows the master alloys to melt more thoroughly and makes the melt mixture more uniform.

[0061] In some embodiments, after melting the aluminum ingot, and before adding appropriate amounts of Al-Cu master alloy and Al-Mn master alloy to the molten aluminum for melting and mixing, the molten aluminum is further subjected to a step of refining and slag removal in sequence.

[0062] In some embodiments, the hydrogen content in the refined aluminum liquid is <0.13mL / 100g.

[0063] In some embodiments, in step S30, the casting and rolling rate in the casting and rolling process is 850 mm / min to 1100 mm / min.

[0064] In some embodiments, prior to step S30, a step of refining the mixed melt is further included.

[0065] In some embodiments, the hydrogen content in the refined mixed melt is ≤0.12mL / 100g.

[0066] In one embodiment of this application, a 3003 alloy aluminum foil is provided, which is prepared from the above-mentioned cast and rolled billet.

[0067] In some embodiments, the thickness of the 3003 alloy aluminum foil is 0.01 mm to 0.02 mm. As an example, the thickness of the 3003 alloy aluminum foil can be 0.01 mm, 0.011 mm, 0.012 mm, 0.013 mm, 0.014 mm, 0.015 mm, 0.016 mm, 0.017 mm, 0.018 mm, 0.019 mm, or 0.02 mm. Further, the thickness of the 3003 alloy aluminum foil can be a range of values ​​defined by any two of the above point values ​​as endpoints.

[0068] In one embodiment of this application, a method for preparing 3003 alloy aluminum foil is provided, comprising the following steps:

[0069] The cast-rolled billet is subjected to cold rolling, intermediate annealing, and foil rolling in sequence.

[0070] In some embodiments, the step of cold rolling the cast-rolled billet includes: rolling the cast-rolled billet in two passes. Further, the first pass has a processing rate of 25% to 35% and a rolling speed of 250 m / min to 350 m / min; the second pass has a processing rate of 30% to 40% and a rolling speed of 300 m / min to 400 m / min.

[0071] In some embodiments, after the cast-rolled billet undergoes intermediate annealing and before foil rolling, the process further includes two rolling passes, a first trimming, three rolling passes, and a second trimming of the annealed material.

[0072] In some embodiments, the processing rate of the two rolling passes is 30% to 55%, and the rolling speed is 350 m / min to 600 m / min.

[0073] In some embodiments, in the above three rolling passes, the rolling rate of each pass is 25% to 50%; the rolling speed of each pass is 350 m / min to 600 m / min.

[0074] In some embodiments, the foil rolling process involves 4 to 5 rolling passes sequentially.

[0075] In some embodiments, the processing rate of each pass during foil rolling is 40% to 55%.

[0076] In one embodiment of this application, an application of 3003 alloy aluminum foil in the preparation of batteries is provided.

[0077] In one embodiment of this application, a battery is provided, comprising the aforementioned 3003 alloy aluminum foil.

[0078] In some embodiments, the battery includes a positive current collector. Preferably, the electrode is a positive current collector.

[0079] In some embodiments, the electrode sheet comprises the aforementioned 3003 alloy aluminum foil.

[0080] To make the objectives, technical solutions, and advantages of this invention clearer and more concise, the invention is described using the following specific embodiments, but the invention is by no means limited to these embodiments. The embodiments described below are merely preferred embodiments of the invention and can be used to describe the invention, but should not be construed as limiting the scope of the invention. It should be noted that any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the protection scope of this invention.

[0081] To better illustrate the present invention, the following embodiments are provided for further explanation. The specific embodiments are as follows.

[0082] Example 1:

[0083] (1) Batching: Batching is carried out according to the chemical composition of the billet, providing aluminum ingots, Al-Cu and Al-Mn master alloy raw materials with a purity of 99.855%; wherein, the chemical composition of the billet is: Mn: 1.32%, Cu: 0.219%, Ti: 0.022%, Mg: 0.002%, the total content of Si+Fe is 0.118%, Zn: 0.002%, Cr: 0.006%, other impurity elements <0.01%, and the balance is aluminum.

[0084] (2) Smelting: Add raw aluminum ingots to a smelting furnace for melting, and then add a covering agent to cover the molten aluminum.

[0085] (3) Refining: After adding refining agent, refine for 35 minutes. After confirming that the hydrogen content in the aluminum liquid is 0.12 mL / 100 g, remove the slag.

[0086] (4) Aluminum liquid composition confirmation: After stirring for 30 minutes at a temperature of 763℃, samples were taken to analyze the composition of aluminum liquid.

[0087] (5) Composition adjustment: Calculate the amount of intermediate alloy to be added based on the chemical composition of the billet and the composition of the aluminum liquid. Add Al-Cu and Al-Mn intermediate alloys to the aluminum liquid and stir to assist the melting of the intermediate alloys. Stir for 35 minutes. Continue to sample and analyze the composition of the mixed melt. After confirming that the composition is within the control range, prepare to unload the furnace. The unloading temperature is 760℃.

[0088] (6) Refining of mixed melt: The mixed melt is introduced into a holding furnace for refining; the refining is completed when the hydrogen content in the melt is ≤0.12ml / 100g.

[0089] (7) After refining, grain refiner is added by “double wire feeding”; then casting and rolling is carried out at a speed of 1010 mm / min to obtain 6.82×1420 mm 3003 cast and rolled coil (i.e. cast and rolled billet).

[0090] (8) Cold rolling:

[0091] a. The cast-rolled coil is subjected to two passes of cold rolling. The first pass has a processing rate of 35% and a rolling speed of 300 m / min. The second pass has a processing rate of 40% and a rolling speed of 400 m / min.

[0092] b. After rolling in step a, the material is subjected to complete recrystallization annealing at 460℃ for 8 hours.

[0093] c. When the annealed material cools to room temperature, it is rolled again in two passes, with a processing rate of 52% per pass and a rolling speed of 500 m / min.

[0094] d. After the rolling process in step c is completed, the edges are trimmed to obtain an aluminum coil with a thickness of 1.3mm.

[0095] e. Continue to perform three passes of cold rolling on the aluminum coil, with processing rates of 46%, 45% and 44% for each pass, and a rolling speed of 500 m / min for each pass; after the three passes are completed, trim the edges to obtain a cold-rolled aluminum coil with a thickness of 0.21 mm.

[0096] (9) Foil rolling:

[0097] a. The aluminum foil is rolled in four passes at processing rates of 42%, 43%, 44%, and 45% in an aluminum foil roughing mill. After four passes, the aluminum foil thickness is 0.021 mm.

[0098] b. Then, the aluminum foil obtained in step a is rolled in an aluminum foil finishing machine with a processing rate of 42%~45% to obtain aluminum foil with a thickness of 0.012mm~0.013mm.

[0099] Example 2

[0100] The preparation method of this embodiment is basically the same as that of Example 1, except that the chemical composition of the cast-rolled billet is different. The chemical composition of the cast-rolled billet in this embodiment, by mass percentage, includes Mn: 1.33%, Cu: 0.221%, Ti: 0.026%, Mg: 0.001%, the total content of Si+Fe is 0.127%, Zn: 0.002%, Cr: 0.006%, other impurity elements <0.01%, and the balance aluminum.

[0101] Example 3

[0102] The preparation method of this embodiment is basically the same as that of Example 1, except that the chemical composition of the cast-rolled billet is different. The chemical composition of the cast-rolled billet in this embodiment, by mass percentage, includes Mn: 1.35%, Cu: 0.20%, Ti: 0.025%, Mg: 0.003%, Si+Fe total content of 0.130%, Zn: 0.002%, Cr: 0.006%, other impurity elements <0.01%, and balance aluminum.

[0103] Example 4

[0104] The preparation method of this embodiment is basically the same as that of Example 1, except that the chemical composition of the cast-rolled billet is different. The chemical composition of the cast-rolled billet in this embodiment, by mass percentage, includes Mn: 1.25%, Cu: 0.24%, Ti: 0.020%, Mg: 0.002%, Si+Fe total content of 0.135%, Zn: 0.003%, Cr: 0.006%, other impurity elements <0.01%, and balance aluminum.

[0105] Example 5

[0106] The preparation method of this embodiment is basically the same as that of Example 1, except that the chemical composition of the cast-rolled billet is different. The chemical composition of the cast-rolled billet in this embodiment, by mass percentage, includes Mn: 1.20%, Cu: 0.26%, Ti: 0.025%, Mg: 0.002%, Si+Fe total content of 0.137%, Zn: 0.003%, Cr: 0.006%, other impurity elements <0.01%, and balance aluminum.

[0107] Comparative Example 1

[0108] The preparation method of this comparative example is basically the same as that of Example 1, except that the chemical composition of the cast-rolled billet is different. The chemical composition of the cast-rolled billet in this comparative example, by mass percentage, includes Mn: 1.15%, Cu: 0.04%, Ti: 0.025%, Mg: 0.007%, the total content of Si+Fe is 0.186%, Zn: 0.01%, Cr: 0.008%, other impurity elements <0.01%, and the balance aluminum.

[0109] Comparative Example 2

[0110] The preparation method of this comparative example is basically the same as that of Example 1, except that the chemical composition of the cast-rolled billet is different. The chemical composition of the cast-rolled billet in this comparative example, by mass percentage, includes Mn: 1.4%, Cu: 0.09%, Ti: 0.03%, Mg: 0.005%, the total content of Si+Fe is 0.19%, Zn: 0.01%, Cr: 0.008%, other impurity elements <0.01%, and the balance aluminum.

[0111] Comparative Example 3

[0112] The preparation method of this comparative example is basically the same as that of Example 1, except that the chemical composition of the cast-rolled billet is different. The chemical composition of the cast-rolled billet in this comparative example, by mass percentage, includes Mn: 1.35%, Cu: 0.19%, Ti: 0.02%, Mg: 0.005%, Si+Fe total content of 0.18%, Zn: 0.01%, Cr: 0.008%, other impurity elements <0.01%, and balance aluminum.

[0113] The chemical composition of the cast-rolled billets prepared in each embodiment and comparative example is shown in Table 1 below.

[0114] Table 1

[0115]

[0116] The composition of the cast-rolled billets in the various embodiments and comparative examples in the table also includes a balance of aluminum.

[0117] Performance testing

[0118] The tensile strength and elongation of the blanks prepared in each embodiment and comparative example were tested according to the method specified in GB / T 22638.11-2023 "Test Methods for Aluminum Foil Part 11: Test of Mechanical Properties".

[0119] The thermal conductivity of the blanks prepared in each embodiment and comparative example was tested using the method specified in JG / T 425-2019.

[0120] Cross sections of the cast-rolled billets prepared in Examples 1 and 2 were sampled and subjected to XRD analysis to obtain the component distribution characteristics of the cross sections of the cast-rolled billets.

[0121] The performance test data for each embodiment and comparative example are shown in Table 2 below.

[0122] Table 2

[0123]

[0124] See Figure 1 and Figure 2 , Figure 1The elemental distribution diagram is shown for the cast-rolled billet prepared in Example 1. Figure 2 This is an elemental distribution diagram of the cast-rolled billet prepared in Example 2. From... Figure 1 and Figure 2 It can be seen that all elements are evenly distributed in the cast-rolled billet. Combined with the performance and thermal conductivity test results shown in Table 2, it can be concluded that:

[0125] (1) The cast-rolled billet obtained by adopting the technical solution of this application has a uniformly distributed component dispersion characteristic.

[0126] (2) Under the technical conditions, the tensile strength of the billet is significantly higher than that of the comparative example. When the billet is used for cold rolling and foil rolling, the strength of the aluminum foil is further improved, providing a process basis for improving the elongation of the material through heat treatment.

[0127] (3) Cu element, as the second reinforcing phase, can improve the thermal conductivity of aluminum foil. Combined with the high strength of aluminum foil, it provides convenience for heat treatment in deep processing, thus laying the performance foundation for further improvement of the thermal conductivity of aluminum foil.

[0128] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0129] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims, and the specification can be used to interpret the content of the claims.

Claims

1. A 3003 alloy cast-rolled billet, characterized in that, Based on mass percentage, it includes the following elemental components: Mn: 1.1%~1.4%, Cu: 0.2%~0.3%, Ti: 0.01%~0.028%, Mg: 0~0.005%, Si and Fe total content of 0.1%~0.2%, and balance aluminum.

2. The cast-rolled billet as described in claim 1, characterized in that, The Cu content is 0.21% to 0.24% by mass.

3. The cast-rolled billet as described in claim 1, characterized in that, The chemical composition of the cast-rolled billet also includes Zn and / or Cr.

4. The cast-rolled billet as described in claim 3, characterized in that, The total amount of Zn and Cr in the cast-rolled billet accounts for 0.002% to 0.01% of the mass.

5. The cast-rolled billet as described in claim 4, characterized in that, The cast-rolled billet comprises the following elemental components by mass percentage: Mn: 1.1%~1.35%, Cu: 0.20%~0.24%, Ti: 0.015%~0.028%, Mg: 0.001%~0.003%, Si and Fe total content of 0.1%~0.14%, Zn and Cr total content of 0.005%~0.009%, and balance aluminum.

6. The method for preparing cast-rolled billets according to any one of claims 1 to 5, characterized in that, The preparation steps include the following: Weigh the raw materials according to the elemental composition of the cast-rolled billet; The raw materials are melted and mixed to obtain a mixed melt; The mixed melt is subjected to casting and rolling to obtain the cast and rolled billet.

7. The method for preparing cast-rolled billets as described in claim 6, characterized in that, The raw materials include aluminum ingots with a purity of ≥99.8%, Al-Cu master alloy, and Al-Mn master alloy; The step of melting and mixing the raw materials includes: First, the aluminum ingot is melted to obtain molten aluminum; then, the Al-Cu master alloy and the Al-Mn master alloy are added to the molten aluminum.

8. A 3003 alloy aluminum foil, characterized in that, The aluminum foil is prepared from the cast-rolled billet as described in any one of claims 1 to 5.

9. The 3003 alloy aluminum foil as described in claim 8, characterized in that, The thickness of the 3003 alloy aluminum foil is 0.01mm~0.02mm.

10. The method for preparing 3003 alloy aluminum foil according to any one of claims 8 to 9, characterized in that, The preparation steps include the following: The cast-rolled billet is subjected to cold rolling, intermediate annealing, and foil rolling in sequence.

11. The application of the 3003 alloy aluminum foil as described in any one of claims 8 to 9 in the preparation of batteries.

12. A battery, characterized in that, Includes the 3003 alloy aluminum foil as described in any one of claims 8 to 9.

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