CN114855101A

CN114855101A - Manufacturing method of positive aluminum foil material for pure aluminum-based battery tab

Info

Publication number: CN114855101A
Application number: CN202210534792.5A
Authority: CN
Inventors: 蒲剑丛; 贺耀文; 左宏; 沈国柱; 李心愿; 崔敬鑫; 刘延军
Original assignee: Xinjiang Joinworld Co Ltd
Current assignee: Xinjiang Joinworld Co Ltd
Priority date: 2022-05-17
Filing date: 2022-05-17
Publication date: 2022-08-05
Anticipated expiration: 2042-05-17
Also published as: CN114855101B

Abstract

The invention discloses a method for manufacturing a positive aluminum foil material for a pure aluminum-based battery tab, and belongs to the technical field of industrial high-purity aluminum. The method comprises the following steps: (1) hot rolling: carrying out soaking treatment on the pure aluminum cast ingot, and then carrying out hot rolling to obtain a hot rolled coiled material with the thickness of 5-7 mm; (2) obtaining a 2.0-3.5mm hard cold-rolled coil through 2-3 times of cold rolling; (3) intermediate annealing: controlling the intermediate annealing temperature to be 400-450 ℃ and keeping the temperature for 6-12 h; (4) cold rolling for 4-8 times to the thickness of 0.1-0.4 mm to obtain a hard foil roll product; (5) and annealing the finished product to obtain a soft foil roll finished product with the thickness of 0.1-0.4 mm and the tensile strength of more than or equal to 80 MPa. The method of the invention prepares the high-conductivity, high-bending and high-surface tab positive electrode aluminum strip material with excellent performance of 0.1mm-0.4 mm.

Description

Manufacturing method of positive aluminum foil material for pure aluminum-based battery tab

Technical Field

The invention relates to the technical field of aluminum-based batteries, in particular to a method for manufacturing a positive aluminum foil material for a pure aluminum-based battery tab.

Background

The tab is a raw material of a lithium ion polymer battery product and is used as a material for conductive connection of a power battery and a 3C battery. For example, the tabs are needed to be used for mobile phone batteries, bluetooth batteries, notebook batteries and the like used in life. The battery is divided into positive and negative electrodes, the tabs are metal conductors leading out the positive and negative electrodes from the battery core, and the ears of the positive and negative electrodes of the battery are contact points during charging and discharging. This contact point is not the copper sheet that we see on the outside of the cell, but rather a connection inside the cell. The tabs are made of three materials, the positive electrode of the battery is made of aluminum (Al) material, the negative electrode of the battery is made of nickel (Ni) material, and the negative electrode of the battery is also made of copper nickel (Ni-Cu) material, and the tabs and the negative electrode are both formed by compounding a film and a metal belt. The particularity of the using working condition of the tab material makes the tab material provide severe using requirements for the characteristics of the material, such as tensile strength, conductivity, welding strength, bending and the like. The main research direction is based on the aspects of reducing the resistivity, controlling the material strength on a certain basis and simultaneously having higher bending property.

The 1xxx series aluminum alloy has excellent electrical conductivity and higher plasticity, so the 1xxx series aluminum alloy is widely used in conductor materials with low strength, and the materials are required to have fine and uniform grain structure characteristics for obtaining good plasticity. The products are generally based on pure aluminum, and in order to simultaneously ensure the improvement of strength and bending, the synchronous improvement of the strength, bending and plasticity is realized by alloying on the basis of the pure aluminum base and then by processing, heat treatment and other process methods.

The existing aluminum strip material for producing new energy power batteries and 3C digital battery tabs has two main production process flows: cast rolling and hot rolling. The cast-rolling method, for example, in patent CN201811509825.0, discloses a method for preparing an aluminum strip material for a new energy power battery tab, i.e., a cast-rolling method directly produces a cast-rolling coil of about 7mm, and an aluminum foil blank is obtained after cold rolling and annealing; the other method is a semi-continuous casting ingot, hot rolling cogging is performed after face milling, and then cold rolling is performed to form a blank, namely a hot rolling method, for example, a preparation method of a 1-series aluminum alloy foil for the positive electrode of the soft package lithium battery tab disclosed in patent No. CN202110684014. X. Two production processes are used for producing aluminum foil blanks at present, and each process has advantages and disadvantages. The hot rolling method has uniform structure and few defects, and is favorable for rolling; the blank produced by the casting and rolling method has short production flow and is more suitable for rolling thinner plates or foils.

The production process of the blank by the casting and rolling method is also divided into two production processes, one is casting and rolling by remelting aluminum ingots, the other is casting and rolling by directly adopting electrolytic molten aluminum liquid, and compared with the production of the aluminum foil blank by casting and rolling the remelting aluminum ingots, the production of the aluminum foil blank by directly casting and rolling the electrolytic aluminum liquid has some technical problems to be solved. Because the temperature of the electrolytic aluminum liquid is generally about 930 ℃, even if the electrolytic aluminum liquid is transferred to a casting workshop, the temperature can be kept between 860 ℃ and 900 ℃, the water content of raw and auxiliary materials used by the aluminum during electrolysis is high, the temperature of the electrolytic aluminum liquid is high, and the gas content, especially the hydrogen content, in the aluminum liquid is high, the degassing process before casting and rolling is very important, once degassing is unfavorable, the gas content of a cast and rolled blank exceeds the standard requirement or the pinhole degree of a subsequently processed plate is increased, the product reject ratio is increased, and even the material can not be processed to the designed size.

Although the existing cast-rolling method for producing the aluminum foil is more complete in process and can reduce the production cost, the inherent process characteristics of the cast-rolling process cause more defects such as impurities in a cast-rolled plate due to inherent process conditions, the surface of a product is very easy to have defects such as pinholes and peeling, and the product is unqualified due to the problem of component segregation, so that the method is not suitable for a middle-high-end aluminum tab material with higher product quality requirement.

In the prior art, the tensile strength of an aluminum foil product produced by a hot rolling method is only 70-80MPa, which may influence the quality control of subsequent slitting. In addition, no clear control and specific index explanation are made on the electrolyte resistance and the conductivity of the pole lug material. With the rapid development of the new energy battery industry, higher and more severe requirements are provided for the quality of the tab material, and the aluminum foil material for the tab is promoted to continuously make progress towards the requirements of high strength, high bending, high conductivity and high surface.

Disclosure of Invention

The invention aims to provide a method for manufacturing a positive aluminum foil material for a pure aluminum-based battery tab, which adopts raw materials based on 99.90 percent, strictly controls the intake of main elements, and improves the mechanical property, the conductivity and the tissue uniformity of a product through the process control of soaking, hot rolling, cold rolling, foil rolling and annealing.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a manufacturing method of a positive aluminum foil material for a pure aluminum-based battery tab adopts semi-continuous casting to produce a plate-shaped cast ingot, and the plate-shaped cast ingot is firstly hot-rolled and then subjected to cold processing, heat treatment and finishing production to obtain the positive aluminum foil material for the pure aluminum-based battery tab; the method comprises the following steps:

(1) hot rolling: carrying out soaking treatment on the pure aluminum cast ingot, and then carrying out hot rolling, wherein the starting hot rolling temperature is 520-560 ℃, the finishing temperature is controlled to be 270-300 ℃, the hot rolling pass is 17-21, the reduction rate of the coiling pass is controlled to be 40-60%, and a hot rolled coil with the thickness of 5-7mm is obtained after rolling;

(2) carrying out cold rolling on the cogging hot-rolled coil for 2-3 times to obtain a hard cold-rolled coil of 2.0-3.5 mm;

(3) intermediate annealing: the intermediate annealing temperature is controlled to be 400-450 ℃, and the heat preservation time is 6-12 h.

(4) And (4) after the intermediate annealing in the step (3), performing cold rolling for 4-8 times to obtain a finished product with the thickness of 0.1-0.4 mm, and obtaining a hard foil coil finished product with the foil surface roughness Ra value of 0.15-0.30 mu m.

(5) And annealing the hard foil coil finished product to obtain a soft foil coil finished product with the thickness of 0.1-0.4 mm and the tensile strength of more than or equal to 80 MPa.

In the step (1), the preparation process of the pure aluminum ingot comprises the following steps: smelting an aluminum ingot with the purity of more than or equal to 99.90 wt.% as a raw material, adding 0.43-0.45 wt.% of Fe and 0.13-0.16 wt.% of Si into the aluminum melt, and casting the melt to obtain the pure aluminum ingot, wherein the Al content in the pure aluminum ingot is more than or equal to 99.30 wt.%.

In the step (1), the soaking process comprises: soaking the cast ingot at 550-610 ℃ and keeping the temperature for 10-20 h; the main purpose of soaking is to eliminate defects in the casting process and component segregation, to make the structure and components sufficiently uniform, and to facilitate hot rolling.

In the hot rolling process in the step (1), the rolling speed is controlled to be 60-120 m/min.

The cold rolling reduction rate between the intermediate annealing (first annealing) and the finished product annealing (second annealing) is more than 80 percent.

And (4) rolling the soft foil obtained after the cold rolling in the step (4) into a product, cleaning, drying, shearing (slitting), and then carrying out the annealing process of the finished product in the step (5).

When the soft foil coiled product is cleaned, cleaning agent (oil) with the flash point of 30-70 ℃ and the dry point of less than or equal to 220 ℃ is selected to achieve the purpose of quick volatilization, the cleaning speed is controlled to be 60-100m/min, the foil surface is ensured to be dried, and the residue of the cleaning agent (oil) is reduced; controlling the temperature of the drying box to be 90-130 ℃ during drying; transferring the cleaned and dried finished foil roll to a shearing process, and slitting according to the specified product width specification, wherein burrs at the edge part are less than 0.1 mm; and (5) annealing the cut foil coil.

In the step (5), the annealing temperature of the finished product is 300-400 ℃, and the heat preservation time is 4-10 h.

And (5) in the annealing of the finished product in the step (5), performing vacuum annealing under the protective gas of nitrogen or argon.

The design principle and the beneficial effects of the invention are as follows:

the invention mainly uses a hot rolling method to produce a battery tab product with the Al content of more than 99.30 percent (the specific chemical components (wt.%) are 0.43-0.45 percent of Fe, 0.13-0.16 percent of Si, less than 0.01 percent of Cu, less than 0.005 percent of Mn, less than 0.005 percent of Zn, less than 0.005 percent of Mg, less than 0.01 percent of Ga, 0.015-0.025 percent of Ti, less than 0.01 percent of other single impurity elements and the balance of Al).

In general, the types of the aluminum tab materials are distinguished according to the thickness of the aluminum foil, wherein the aluminum tab materials are less than 0.2mm and belong to the category of 3C digital tabs (main specifications of 0.100mm, 0.125mm and 0.150mm), and the aluminum tab materials are more than 0.2mm and belong to the category of power tabs (main specifications of 0.3mm and 0.4 mm). The invention is compatible with the use requirements of two types of products, and the high-conductivity, high-bending and high-surface tab positive electrode aluminum strip material with excellent performance of 0.1-0.4 mm is obtained.

Compared with the prior art for producing aluminum foil blanks by a hot rolling method, the method uses a single-stand hot rolling mill to roll the plate ingot into a hot rolled coil with the thickness of 5-7mm, then the cold rolling processing rate between the intermediate annealing (first annealing) and the finished product annealing (second annealing) is controlled to be more than 80%, the annealing temperature and the heat preservation time of the finished product are strictly controlled, the final product obtains fine and uniform crystal grain tissues, the average crystal grain size is below 40 mu m, and the crystal grain size grade index is more than 6 grade, the tensile strength of the material is improved to 80-90MPa while the plasticity index is ensured, the product performance of high strength and high plasticity is realized, the cutting difficulty (the narrowest cutting is to the width of 1 mm) encountered by the aluminum foil in the downstream customer production can be reduced to a certain extent, and the quality problems of cutter sticking and poor plate shape are avoided.

Drawings

Fig. 1 is a schematic diagram of the grain size and the distribution of the surface grain size of the aluminum strip product of the tab of example 1.

Detailed Description

For a further understanding of the present invention, the following description is given in conjunction with the examples which are set forth to illustrate, but are not to be construed to limit the present invention, features and advantages.

The invention provides a method for manufacturing a positive aluminum foil material for a pure aluminum-based battery tab, which adopts a semi-continuous casting production plate ingot, and is suitable for soft finished products with the specification thickness of 0.1mm-0.4mm through a hot rolling method and a manufacturing method of the positive aluminum foil material for the pure aluminum-based battery tab, which is produced through subsequent cold processing, heat treatment and finishing. The specific production process comprises the following steps:

1. soaking the cast ingot at 550-610 deg.c for 10-20 hr to eliminate the defects and component segregation in the casting process and to homogenize the structure and components and facilitate hot rolling.

2. The hot rolling is started within the temperature range of 520-560 ℃, the final rolling temperature is controlled within 270-300 ℃, the hot rolling pass is 17-21 passes, the reduction rate of the coiling pass is controlled within 40-60%, the grains are crushed and the middle structure is refined, the rolling speed needs to be ensured within a certain range (60-120 m/min), the temperature of the strip is controlled by matching with emulsion lubrication, the precipitation of compounds is reduced, the hot rolled coil with the thickness of 5-7mm is obtained by rolling, and the design of the reduction is paid attention to ensure that the surface aluminum adhesion does not occur.

3. The cogging hot-rolled coil is subjected to 2-3 times of cold rolling to obtain a hard cold-rolled coil with the thickness of 2.0-3.5mm, trimming and cleaning are completed to ensure the quality of the edge part and prevent the strip breakage defect of subsequent rolling, surface drying is ensured, and intermediate annealing is carried out after the residue of a cleaning agent (oil) is reduced.

4. The intermediate annealing temperature is controlled to be 400-450 ℃, the heat preservation time is 6-12h, the work hardening is eliminated, the stress concentration phenomenon is eliminated, and the product performance is ensured.

5. And after annealing, the alloy is produced to the thickness of a finished product of 0.1mm-0.4mm by cold rolling for 4-8 times to obtain a hard finished product with the foil surface roughness Ra value of 0.15-0.30 um.

The cold rolling processing rate between the intermediate annealing (first annealing) and the finished product annealing (second annealing) is more than 80%, the internal dislocation density of the metal is increased, the cold deformation strengthening effect is fully exerted, the hard state strength of the finished product of the material before annealing is improved, the annealing temperature and the heat preservation time of the finished product are strictly controlled, and finally the O-state finished product with the tensile strength of more than or equal to 80Mpa is obtained.

6. Cleaning the finished foil coil, selecting the flash point of the cleaning agent (oil) at 30-70 ℃ and the dry point of the cleaning agent (oil) less than or equal to 220 ℃ to achieve the aim of quick volatilization, controlling the cleaning speed at 60-100m/min, ensuring the drying of the foil surface, reducing the residue of the cleaning agent (oil), and controlling the drying box at 90-130 ℃.

7. And transferring the cleaned finished foil roll to a shearing process, and slitting according to the width specification of a product specified by a customer, wherein burrs at the edge part are less than 0.1 mm.

8. And (3) annealing the cut foil coil finished product, and carrying out vacuum annealing by using protective gas (nitrogen or argon), wherein the annealing temperature of the finished product is 300-400 ℃, and the heat preservation time is 4-10 h.

9. And after the finished product is annealed, rewinding to check the surface quality, and packaging after the mechanical property is checked to be qualified. The finished product annealing atmosphere selects protective gas nitrogen or argon so as to prevent the foil surface from being oxidized during annealing, reduce the oxidation of residual oil products on the foil surface from attaching to the foil surface, quickly volatilize and form a uniform oxidation film.

Example 1:

the process for preparing the positive aluminum foil material for the pure aluminum-based battery tab in the embodiment is as follows:

1. soaking the plate ingot: the ingot is soaked and insulated for 8 hours at 605 ℃ according to the component control of the table 1, and then cooled to 550 ℃ and insulated for 4 hours.

TABLE 1 ingot composition (wt.%)

Fe	Si	Cu	Mn	Zn	Mg	Ga	Ti	Al％
									0.4415	0.1469	0.0006	0.0006	0.0017	0.0008	0.0087	0.0218	≥99.30

2. Hot rolling: the initial rolling temperature of the cast ingot is 540 ℃, the thickness of the cast ingot is 7.0mm after 19 passes, the rolling pass reduction rate is 40-60%, and the rolling speed is 60-100m/min, so that the hot rolled coil with the final rolling temperature of 285 ℃ is obtained.

3. Primary cold rolling: and (3) carrying out 2-pass cold rolling on the hot-rolled coil to obtain a hard cold-rolled plate strip of 3.0mm, wherein the roughness of the roller is 0.45 mu m, the rolling speed is 300m/min, the plate strip is cleaned by using No. 60 cleaning oil before intermediate annealing, and the steel strip on the outer ring of the coil is tightened.

4. Intermediate annealing: and heating to 400 ℃ by adopting a nitrogen annealing furnace according to 6 hours, preserving heat for 8 hours, discharging and cooling.

5. Secondary cold rolling: and continuously rolling the aluminum coil subjected to intermediate annealing for 5 times to obtain a 0.4mm finished product coil, wherein the roughness of the roller is 0.25 mu m, and the rolling speed is 500 m/min.

6. Cleaning: and selecting 60# cleaning oil to be matched with a soft brush roller to clean the plate strip, wherein the cleaning speed is 100m/min, the temperature of a drying box is controlled at 100 ℃, and the surface of the cleaned aluminum coil is ensured to be clean and dry.

7. Annealing of a finished product: and heating to 400 ℃ by adopting a nitrogen annealing furnace according to 6 hours, preserving heat for 8 hours, discharging and cooling.

8. And (5) rewinding for surface quality inspection to obtain a finished product of the positive electrode aluminum strip for the battery tab. The product has fine and uniform grain structure, the average grain size is below 40 mu m, the grain size grade index is more than 6 grades (figure 1), and the tensile strength of the material is improved to 80-90MPa while the plasticity index is ensured. The specific properties of the product are shown in Table 2 below.

Table 2 example 1 final properties of positive electrode aluminum strip

Example 2:

1. soaking the plate ingot: the ingot is soaked and insulated for 8h at 605 ℃ according to the component control of the table 3, and then cooled to 550 ℃ and insulated for 4 h.

TABLE 3 ingot composition (wt.%)

Fe	Si	Cu	Mn	Zn	Mg	Ga	Ti	Al％
									0.4356	0.1382	0.0006	0.0006	0.0019	0.0007	0.0091	0.0215	≥99.30

3. Primary cold rolling: and (3) carrying out 2-pass cold rolling on the hot-rolled coil to obtain a hard cold-rolled plate strip of 3.0mm, wherein the roller roughness is 0.45um, the rolling speed is 300m/min, cleaning the plate strip by using No. 60 cleaning oil before intermediate annealing, and tightening the steel strip on the outer ring of the coil.

5. Secondary cold rolling: and continuously rolling the aluminum coil subjected to intermediate annealing for 5 times to obtain a cold-rolled coil of 0.25mm, wherein the roughness of the roller is 0.25um, and the rolling speed is 500 m/min.

6. Foil rolling: and performing foil rolling production for 2 times, wherein the roughness of a roller is 0.20um, and the rolling speed is 500m/min, so as to obtain an aluminum foil finished product with the thickness of 0.1 mm.

7. Cleaning: and cleaning the finished foil coil, selecting 60# cleaning oil, cleaning at a speed of 100m/min, controlling the temperature of a drying box at 100 ℃, and ensuring that the surface of the cleaned aluminum coil is clean and dry.

8. Shearing: and cutting the cleaned foil roll according to the width specification specified by a customer, wherein burrs on the edge part are less than 0.1 mm.

9. Annealing of a finished product: heating to 300 ℃ by using a vacuum annealing furnace (argon) according to 3h, keeping the temperature for 6h, controlling the vacuum degree to 45000-50000Pa, and discharging and cooling.

10. And after the annealing of the finished product is finished, rewinding to check the surface quality, and checking the mechanical property to obtain the finished product of the anode aluminum foil for the battery tab, wherein the product has fine and uniform grain structure, the average grain size is below 40 mu m, the grain size grade index is more than 6 grade, and the tensile strength of the material is improved to 80-90MPa while the plasticity index is ensured. Specific properties are shown in table 4 below.

Table 4 example 2 final properties of positive electrode aluminum strip

The invention has the following beneficial effects:

(1) the hot rolling method can effectively avoid the defects of surface quality such as pinholes, peeling and the like caused by the cast rolling method, and solve the problems of component segregation, uneven distribution of second phase particles and the like.

(2) The base material of Al content of pure aluminum is more than or equal to 99.90%, so that the nonuniformity of second phase particles of low-purity products is reduced, the content of impurity elements is controlled to be low, and the adverse effects of the precipitation of metal compounds on the corrosion resistance and the conductivity of the products are reduced. The material has electrolyte resistance of not less than 1.7N/mm and resistivity of not more than 2.8 x 10 ^-8 Excellent level of Ω · m.

(3) The method for producing the lug positive electrode aluminum strip material with high strength, high plasticity and high surface by adopting the domestic common single-stand hot rolling mill obtains a clean and smooth material surface with clear and consistent texture through the control of the material hot rolling and cold rolling processing technology and the heat treatment technology, and the dyne value is more than or equal to 35. In the aspect of organization performance, the index of grain size grade is more than 6 grade, the tensile strength is 80-90MPa, and the elongation is as follows: not less than 35% (power pole ear), not less than 25% (digital pole ear), bending performance (180 degree): a series of technical requirements of not less than 8 times (power lug), not less than 10 times (digital lug), HV hardness 23-28 and the like.

Claims

1. A method for manufacturing a positive aluminum foil material for a pure aluminum-based battery tab is characterized by comprising the following steps: the method adopts a semi-continuous casting production plate ingot as a raw material, firstly carries out hot rolling on the plate ingot, and then obtains the anode aluminum foil material for the pure aluminum-based battery tab through cold processing, heat treatment and finishing production; the method comprises the following steps:

2. The method for manufacturing the positive aluminum foil material for the pure aluminum-based battery tab according to claim 1, wherein the method comprises the following steps: in the step (1), the preparation process of the pure aluminum ingot comprises the following steps: smelting an aluminum ingot with the purity of more than or equal to 99.90 wt.% as a raw material, adding 0.43-0.45 wt.% of Fe and 0.13-0.16 wt.% of Si into the aluminum melt, and casting the melt to obtain the pure aluminum ingot, wherein the Al content in the pure aluminum ingot is more than or equal to 99.30 wt.%.

3. The method for manufacturing the positive electrode aluminum foil material for the pure aluminum-based battery tab according to claim 1, wherein the method comprises the following steps: in the step (1), the soaking treatment process comprises the following steps: soaking the cast ingot at 550-610 ℃ and keeping the temperature for 10-20 h; the main purpose of soaking is to eliminate defects in the casting process and component segregation, to make the structure and components sufficiently uniform, and to facilitate hot rolling.

4. The method for manufacturing the positive electrode aluminum foil material for the pure aluminum-based battery tab according to claim 1, wherein the method comprises the following steps: and (2) in the hot rolling process in the step (1), the rolling speed is controlled to be 60-120 m/min.

5. The method for manufacturing the positive electrode aluminum foil material for the pure aluminum-based battery tab according to claim 1, wherein the method comprises the following steps: the cold rolling reduction rate between the intermediate annealing (first annealing) and the finished product annealing (second annealing) is more than 80 percent.

6. The method for manufacturing the positive electrode aluminum foil material for the pure aluminum-based battery tab according to claim 1, wherein the method comprises the following steps: and (5) rolling the soft foil obtained after the cold rolling in the step (4) into a product, cleaning, drying, shearing (slitting), and then carrying out the annealing process of the finished product in the step (5).

7. The method for manufacturing the positive electrode aluminum foil material for the pure aluminum-based battery tab according to claim 6, wherein the method comprises the following steps: when the soft foil coiled product is cleaned, cleaning agent (oil) with the flash point of 30-70 ℃ and the dry point of less than or equal to 220 ℃ is selected to achieve the purpose of quick volatilization, the cleaning speed is controlled to be 60-100m/min, the foil surface is ensured to be dried, and the residue of the cleaning agent (oil) is reduced; controlling the temperature of the drying box to be 90-130 ℃ during drying; transferring the cleaned and dried finished foil roll to a shearing process, and slitting according to the specified product width specification, wherein burrs at the edge part are less than 0.1 mm; and (5) annealing the cut foil coil.

8. The method for manufacturing the positive aluminum foil material for the pure aluminum-based battery tab according to claim 1, wherein the method comprises the following steps: in the step (5), the annealing temperature of the finished product is 300-400 ℃, and the heat preservation time is 4-10 h.

9. The method for manufacturing the positive electrode aluminum foil material for the pure aluminum-based battery tab according to claim 1, wherein the method comprises the following steps: and (5) in the annealing of the finished product, carrying out vacuum annealing under the protective gas of nitrogen or argon.

10. The method for manufacturing the positive electrode aluminum foil material for the pure aluminum-based battery tab according to claim 1, wherein the method comprises the following steps: the Al content in the positive aluminum foil material for the pure aluminum-based battery tab is more than 99.30 wt.%.