Anisotropic positive electrode aluminum current collector, its manufacturing method, and electrochemical device

Abstract

The present invention provides a method for manufacturing an anisotropic positive aluminum current collector. The present invention also provides an anisotropic positive aluminum current collector and an electrochemical device. [Means] The above-mentioned manufacturing method includes the steps of providing an electrolytic aluminum solution, and adding an aluminum ingot to the electrolytic aluminum solution to obtain a melt, wherein the elemental components of the melt include Si, Fe, Cu, Mn, Ti, Ni, Cr, and Al; adding a refining agent to the melt to refine it to obtain an aluminum liquid; casting and rolling the aluminum liquid in a casting and rolling mill to obtain a billet; cold-rolling the billet and then homogenizing annealing it to obtain a first intermediate; and recrystallizing annealing the first intermediate to obtain an anisotropic positive aluminum current collector, wherein the anisotropic positive aluminum current collector is provided with a first heat conductor in a processing direction, a second heat conductor in a transverse direction perpendicular to the processing direction, and a heat insulator is further provided on the anisotropic positive aluminum current collector, and the heat insulator is perpendicular to both the first heat conductor and the second heat conductor. The anisotropic positive electrode aluminum current collector thus produced is highly safe.

Description

[Technical Field]

[0001] The present application relates to the technical field of batteries, and in particular to an anisotropic positive aluminum current collector and its manufacturing method, and an electrochemical device. [Background technology]

[0002] Currently, high-purity aluminum foil is typically used as a positive electrode current collector in electrochemical devices (e.g., batteries). However, although the thermal conductivity of aluminum foil manufactured using conventional processes is nearly consistent in all directions, this characteristic means that after the aluminum foil is used inside a battery, heat is generated in all directions within the battery body, preventing the heat from being immediately dissipated, which increases the safety risk of the battery. Summary of the Invention [Problem to be solved by the invention]

[0003] Based on this, it is necessary to provide a method for manufacturing an anisotropic positive electrode aluminum current collector that can improve safety.

[0004] There is also a need to provide an anisotropic positive aluminum current collector.

[0005] There is also a further need to provide an electrochemical device that includes an anisotropic positive aluminum current collector. [Means for solving the problem]

[0006] At least one embodiment of the present application comprises: providing an electrolytic aluminum solution and adding an aluminum ingot to the electrolytic aluminum solution to obtain a melt, the elemental components of the melt including Si, Fe, Cu, Mn, Ti, Ni, Cr and Al; adding a refining agent to the molten material to refine it and obtain an aluminum liquid; Casting and rolling the aluminum liquid in a casting and rolling mill to obtain a billet; cold rolling the billet and then homogenizing annealing it to obtain a first intermediate body; and recrystallizing annealing the first intermediate to obtain an anisotropic positive aluminum current collector, Provided is a method for producing an anisotropic positive aluminum current collector, wherein a first heat conductor is provided on the anisotropic positive aluminum current collector in a processing direction, a second heat conductor is provided on the anisotropic positive aluminum current collector in a lateral direction perpendicular to the processing direction, and an insulator is further provided on the anisotropic positive aluminum current collector, and the insulator is perpendicular to both the first heat conductor and the second heat conductor.

[0007] In some embodiments therein, the mass percentages of each elemental component of the melt are: Si 0.1%-0.15%, Fe 0.45%-0.5%, Cu 0.1%-0.15%, Mn 1.1%-1.2%, Ti 0.02%-0.04%, Ni 0.02%-0.04%, Cr 0.02%-0.04%, and the balance Al.

[0008] In some embodiments thereof, the first intermediate is recrystallized and annealed to obtain a second intermediate, and the manufacturing method includes: The method further includes rolling the second intermediate body to a predetermined thickness to obtain the anisotropic positive electrode aluminum current collector.

[0009] In some embodiments thereof, the manufacturing method includes any one of the following (1) to (4). (1) The homogenization annealing temperature is 440°C to 490°C, (2) the homogenization annealing time is 20 hours to 30 hours; (3) The temperature of the recrystallization annealing is 270°C to 330°C, (4) The recrystallization annealing time is 12 hours to 19 hours.

[0010] In some embodiments thereof, after obtaining the aluminum liquid and before casting and rolling the aluminum liquid in a casting and rolling mill, the manufacturing method includes: pouring the aluminum liquid into a static furnace and controlling the temperature in the static furnace to 750°C to 760°C; The aluminum liquid in the static furnace is sent to a trough, and aluminum titanium boron yarn is added in the reverse direction to refine the crystal grains; degassing the aluminum liquid in the trough with pure nitrogen gas or pure argon gas in a degassing box; and filtering and purifying the degassed aluminum liquid.

[0011] At least one embodiment of the present application provides an anisotropic positive aluminum current collector containing nickel metal and chromium metal, wherein a first heat conductor is provided on the anisotropic positive aluminum current collector in a processing direction, a second heat conductor is provided on the anisotropic positive aluminum current collector in a transverse direction perpendicular to the processing direction, and an insulator is further provided on the anisotropic positive aluminum current collector, and the insulator is perpendicular to both the first heat conductor and the second heat conductor.

[0012] In some embodiments, the anisotropic positive aluminum current collector further contains at least one element selected from the group consisting of Fe, Cu, Mn, and Ti, and Ni and Cr.

[0013] In some embodiments thereof, the anisotropic positive aluminum current collector has a difference in thermal conductivity in each direction greater than 0.5%, preferably greater than 0.8%, and most preferably greater than 1.0%.

[0014] In some embodiments thereof, the anisotropic positive aluminum current collector has a combined mass fraction of the nickel metal and the chromium metal less than 1%, preferably less than 0.8%, and most preferably less than 0.5%.

[0015] In some embodiments thereof, the anisotropic positive aluminum current collector has a total mass fraction of the nickel metal and the chromium metal greater than 0.05%.

[0016] In some embodiments thereof, the anisotropic positive electrode aluminum current collector includes any one of the following (1) to (2): (1) The thickness of the anisotropic positive electrode aluminum current collector is 4 μm to 20 μm, (2) The dyne value of the surface of the anisotropic positive electrode aluminum current collector is greater than 20.

[0017] In some embodiments thereof, the anisotropic positive electrode aluminum current collector includes any one of the following (1) to (5): (1) The anisotropic positive electrode aluminum current collector has a puncture strength of 50 gf or more, (2) The anisotropic positive electrode aluminum current collector has an elongation strength of 100 MPa or more in the processing direction, (3) The anisotropic positive electrode aluminum current collector has an elongation strength of 100 MPa or more in a transverse direction perpendicular to the processing direction, (4) The anisotropic positive electrode aluminum current collector has an elongation of 1% or more in the processing direction, (5) The anisotropic positive electrode aluminum current collector has an elongation of 1% or more in a transverse direction perpendicular to the processing direction.

[0018] At least one embodiment of the present application provides an anisotropic positive aluminum current collector manufactured by the manufacturing method, or an electrochemical device including the anisotropic positive aluminum current collector. [Effects of the Invention]

[0019] The present invention involves doping aluminum metal with a certain amount of nickel and chromium, changing the lattice orientation during rolling of the aluminum metal with the nickel and chromium, thereby stretching the aluminum crystals in the machine direction (MD) and transverse direction (TD), thereby forming the first and second heat conductors, respectively, and forming the thermal insulator perpendicular to both the first and second heat conductors. After the current collector of the anisotropic positive aluminum current collector is connected to a tab in an electrochemical device, the anisotropic positive aluminum current collector not only reduces heat conduction in the tab but also allows heat generated inside the battery to be conducted through the first and second heat conductors, thereby preventing the temperature inside the electrochemical device from becoming too high and improving the safety of the electrochemical device. [Brief explanation of the drawings]

[0020] To better describe and explain the embodiments and / or examples of the present application, reference may be made to one or more drawings. Additional detail or illustrations for the purposes of illustrating the drawings should not be deemed to limit the scope of either the disclosed application, the presently described examples and / or examples, or the best mode of these applications as currently understood.

[0021] [Figure 1] 1 is a flowchart showing the manufacturing process of an anisotropic positive electrode aluminum current collector according to the present application. DETAILED DESCRIPTION OF THE INVENTION

[0022] To facilitate an understanding of the present application, the present application will now be described more fully hereinafter with reference to the associated drawings. Preferred examples of the present application are illustrated in the drawings. However, the present application is not limited to the embodiments set forth herein, but may be embodied in many different forms. Rather, the purpose of providing these examples is to provide a more complete understanding of the present disclosure.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. The terms used herein are only for describing specific examples and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more associated exemplified items. Measurement of physical quantities in the examples can be performed according to conventional methods known to those skilled in the art.

[0024] As shown in FIG. 1, at least one embodiment of the present application provides a method for manufacturing an anisotropic positive aluminum current collector, including the following steps:

[0025] Step S11: Provide an electrolytic aluminum solution, and add an aluminum ingot to the electrolytic aluminum solution to obtain a melt.

[0026] Specifically, an electrolytic aluminum molten solution is provided, and the electrolytic aluminum solution is sent to a smelting furnace. Aluminum ingots are added to the smelting furnace in an amount of 20% to 40% of the total weight of the electrolytic aluminum molten solution to obtain a molten body, and the temperature of the molten body is controlled to 750°C to 780°C.

[0027] Here, the elemental components of the melt include Si, Fe, Cu, Mn, Ti, Ni, Cr, and Al. In one embodiment, the mass percentages of the elemental components of the melt are 0.1% to 0.15% Si, 0.45% to 0.5% Fe, 0.1% to 0.15% Cu, 1.1% to 1.2% Mn, 0.02% to 0.04% Ti, 0.02% to 0.04% Ni, 0.02% to 0.04% Cr, and the balance is Al.

[0028] Step S12: Add a refining agent to the molten material to refine it and obtain an aluminum liquid.

[0029] Specifically, the aluminum liquid is refined by blowing a refining agent into the molten mass using pure nitrogen gas or pure argon gas, thoroughly stirring the mixture, and the refining time is 8 to 10 minutes. The aluminum liquid is then left to stand for 15 to 25 minutes, after which dross is removed from the surface of the aluminum liquid. The aluminum liquid from which the dross has been removed is poured into a static furnace, and the temperature inside the furnace is controlled to 750°C to 760°C. The aluminum liquid in the static furnace is then pumped into a trough, and aluminum titanium boron yarn is added in the reverse direction to refine the crystal grains. The aluminum liquid in the trough is then degassed in a degassing box using pure nitrogen gas or pure argon gas, and then filtered and purified using a ceramic foam filter sheet.

[0030] Step S13: The aluminum liquid is cast and rolled in a casting and rolling mill to obtain a billet.

[0031] Specifically, the purified aluminum liquid is fed into a casting and rolling mill and cast and rolled into billets having a thickness of 5.0 mm to 10.0 mm.

[0032] Step S14: The billet is cold-rolled and then homogenized by annealing to obtain a first intermediate body.

[0033] Specifically, the billet having a thickness of 5.0 mm to 10.0 mm is cold rolled to a thickness of 3.0 mm to 5.0 mm, and the cold rolled billet is subjected to homogenization annealing.

[0034] In one embodiment, the homogenization annealing temperature may be 440° C. to 490° C. In one embodiment, the homogenization annealing time may be 20 hours to 30 hours.

[0035] Step S15: The first intermediate is recrystallized and annealed to obtain a second intermediate.

[0036] In one embodiment, the first intermediate body may be cold-rolled before being recrystallization annealed to reduce the thickness of the first intermediate body from 3.0 mm to 5.0 mm to 0.2 mm to 0.6 mm.

[0037] In one embodiment, the temperature of the recrystallization annealing may be 270° C. to 330° C. In one embodiment, the time of the recrystallization annealing may be 12 hours to 19 hours.

[0038] Step S16: The second intermediate body is rolled to a predetermined thickness to obtain an anisotropic positive electrode aluminum current collector.

[0039] Here, the predetermined thickness can be set according to actual needs. In one embodiment, the predetermined thickness may be 4 μm to 20 μm. That is, the thickness of the anisotropic positive electrode aluminum current collector may be 4 μm to 20 μm.

[0040] Here, a first heat conductor is provided on the anisotropic positive aluminum current collector in the processing direction (MD), a second heat conductor is provided on the anisotropic positive aluminum current collector in the transverse direction (TD) perpendicular to the processing direction (MD), and an insulator is further provided on the anisotropic positive aluminum current collector, and the insulator is perpendicular to both the first heat conductor and the second heat conductor.

[0041] During the rolling process of aluminum metal, the doping of nickel and chromium metals changes the lattice structure and grain boundary characteristics of the aluminum metal. This change causes grain boundary movement and migration, with certain locations of nickel and chromium metal becoming core regions of the grain boundaries. During the rolling process, the increased mobility of grain boundaries causes localized flow of aluminum metal, leading to the accumulation of nickel and chromium metals, forming layer interfaces. Second, the doping of nickel and chromium metals changes the grain boundary structure and lattice strain of the aluminum crystal, affecting its plastic behavior. When the aluminum metal is deformed during processing, high-strain regions form at the layer interfaces where nickel and chromium metals are present. In these high-strain regions, the sliding of aluminum metal crystals is strengthened, causing the lattice to elongate along the MD and TD directions, i.e., aluminum crystals grow along the MD and TD directions, respectively. Finally, the aluminum crystals switch from growing in the thickness direction to growing in both the MD and TD directions, forming the first and second heat transfer bodies, respectively. Here, the first heat transfer body refers to a layer or region that has stronger thermal conductivity in the TD direction, the second heat transfer body refers to a layer or region that has stronger thermal conductivity in the MD direction, and the insulator is a layer or region that is perpendicular to both the TD and MD directions.

[0042] After the current collector of the anisotropic positive aluminum current collector is connected to a tab in the electrochemical device, the heat generated inside the electrochemical device is diffused to the outside along the first heat conductor and the second heat conductor.

[0043] In one embodiment, the anisotropic positive aluminum current collector has a difference between the thermal conductivities in each direction of greater than 0.5%.

[0044] In one embodiment, the anisotropic positive aluminum current collector has a total mass fraction of the nickel metal and the chromium metal less than 1%.

[0045] In one embodiment, the anisotropic positive aluminum current collector has a surface dyne value of greater than 20.

[0046] In one embodiment, the anisotropic positive electrode aluminum current collector has a puncture strength of 50 gf or more.

[0047] In one embodiment, the anisotropic positive electrode aluminum current collector has an elongation strength of 100 MPa or more in the machine direction (MD). In another embodiment, the anisotropic positive electrode aluminum current collector has an elongation strength of 100 MPa or more in the transverse direction (TD) perpendicular to the machine direction (MD).

[0048] In one embodiment, the anisotropic positive electrode aluminum current collector has an elongation of 1% or more in the machine direction (MD). In another embodiment, the anisotropic positive electrode aluminum current collector has an elongation of 1% or more in the transverse direction (TD) perpendicular to the machine direction (MD).

[0049] At least one embodiment of the present application provides an anisotropic positive aluminum current collector manufactured by the above manufacturing method, wherein the elemental components of the anisotropic positive aluminum current collector include Si, Fe, Cu, Mn, Ti, Ni, Cr, and Al.

[0050] In one embodiment, the mass percentages of the elemental components of the anisotropic positive electrode aluminum current collector are 0.1% to 0.15% Si, 0.45% to 0.5% Fe, 0.1% to 0.15% Cu, 1.1% to 1.2% Mn, 0.02% to 0.04% Ti, 0.02% to 0.04% Ni, 0.02% to 0.04% Cr, and the balance is Al.

[0051] Here, a first heat conductor is provided on the anisotropic positive aluminum current collector in the processing direction (MD), a second heat conductor is provided on the anisotropic positive aluminum current collector in the transverse direction (TD) perpendicular to the processing direction (MD), and an insulator is further provided on the anisotropic positive aluminum current collector, and the insulator is perpendicular to both the first heat conductor and the second heat conductor.

[0052] The appropriate addition of Ni and Cr not only enables the production of an anisotropic positive aluminum current collector, but also improves its performance, such as processability, strength, hardness, corrosion resistance, high-temperature mechanical properties, and stability. If the Ni and Cr contents are low or high, it becomes difficult to produce an anisotropic positive aluminum current collector, and the mechanical and mechanical properties of the current collector are affected.

[0053] In one embodiment, the anisotropic positive aluminum current collector is measured in accordance with GB / T 22588-2008 using a TC3000E portable thermal conductivity meter manufactured by Xi'an Xiaxi Electronics Technology Co., Ltd. The anisotropic positive aluminum current collector has a thermal conductivity difference of greater than 0.5% between the direction of the first heat transfer body and the direction of the insulator, and / or a thermal conductivity difference of greater than 0.5% between the direction of the second heat transfer body and the direction of the insulator, and / or a thermal conductivity difference of greater than 0.5% between the direction of the first heat transfer body and the direction of the second heat transfer body.

[0054] In one embodiment, the anisotropic positive aluminum current collector has a total mass fraction of the nickel metal and the chromium metal less than 1%.

[0055] In one embodiment, the anisotropic positive electrode aluminum current collector has a thickness of 4 μm to 20 μm.

[0056] In one embodiment, the anisotropic positive aluminum current collector has a surface dyne value of greater than 20.

[0057] The anisotropic positive aluminum current collector is placed in an oven at 80°C for 5 minutes, and then lines are drawn on the surface of the measurement sample using dyne pens that represent different dyne values. Whether the lines shrink or not is observed, and the dyne value of the surface is finally determined.

[0058] In one embodiment, the anisotropic positive electrode aluminum current collector has a puncture strength of 50 gf or more.

[0059] In one embodiment, the anisotropic positive electrode aluminum current collector has an elongation strength of 100 MPa or more in the machine direction (MD). In another embodiment, the anisotropic positive electrode aluminum current collector has an elongation strength of 100 MPa or more in the transverse direction (TD) perpendicular to the machine direction (MD).

[0060] In one embodiment, the anisotropic positive electrode aluminum current collector has an elongation of 1% or more in the machine direction (MD). In another embodiment, the anisotropic positive electrode aluminum current collector has an elongation of 1% or more in the transverse direction (TD) perpendicular to the machine direction (MD).

[0061] At least one embodiment of the present application provides an anisotropic positive aluminum current collector manufactured by the above manufacturing method, or an electrochemical device including the above-described anisotropic positive aluminum current collector. In one embodiment, the electrochemical device may be a battery. Specifically, the battery may be a secondary battery. More specifically, the secondary battery may be a non-aqueous secondary battery.

[0062] The present invention involves doping aluminum metal with a certain amount of nickel and chromium, and using the nickel and chromium to change the lattice orientation during the rolling process of the aluminum metal, thereby stretching the aluminum crystal in the machine direction (MD) and transverse direction (TD), thereby forming the first and second heat conductors, respectively, and forming the thermal insulator perpendicular to both the first and second heat conductors. After the current collector of the anisotropic positive aluminum current collector is connected to a tab in an electrochemical device, the anisotropic positive aluminum current collector not only reduces heat conduction in the tab, but also allows heat generated inside the battery to be conducted through the first and second heat conductors, thereby preventing the temperature inside the electrochemical device from becoming too high and improving the safety of the electrochemical device.

[0063] Specifically, the functions of nickel metal and chromium metal in the present application are as follows: Aluminum metal forms a layer interface in the thickness direction of the aluminum metal after the nickel metal and chromium metal inside are subjected to pressure during the rolling process, and further converts the aluminum crystal from growth in the thickness direction to growth in both the MD and TD directions, thereby forming the first heat conductor and the second heat conductor, respectively. After the current collector of the anisotropic positive aluminum current collector is connected to a tab in an electrochemical device, heat generated inside the electrochemical device is diffused to the outside along the first heat conductor and the second heat conductor.

[0064] Furthermore, the operating temperature of a battery manufactured using the anisotropic positive aluminum current collector of the present application is 5°C to 10°C lower than that of a battery manufactured using conventional aluminum foil, indicating that the safety and cycle life of a battery manufactured using the anisotropic positive aluminum current collector of the present application is better than that of a battery manufactured using conventional aluminum foil.

[0065] The present invention will be further described below with reference to specific examples and comparative examples.

[0066] Example 1 (1) An electrolytic aluminum melt was fed into a smelting furnace, and 30% of an aluminum ingot was added to the total weight of the electrolytic aluminum melt. The temperature of the melt was controlled at 770°C, and the mass percentages of the various elemental components in the melt were adjusted as follows: Si 0.13%, Fe 0.45%, Cu 0.14%, Mn 1.1%, Ti 0.025%, Ni 0.027%, Cr 0.021%, and the balance Al.

[0067] (2) The refining agent was blown into the molten material with pure nitrogen gas or pure argon gas, and the material was thoroughly and uniformly stirred. The refining time was 9 minutes, and the material was left to stand for 20 minutes. The dross on the surface of the aluminum liquid was removed, and the material was poured into a static furnace, and the temperature in the static furnace was controlled at 755°C.

[0068] (3) The aluminum liquid in the static furnace was sent into a trough, and aluminum titanium boron thread was added in the opposite direction to refine the crystal grains. After that, the aluminum liquid was degassed with pure nitrogen gas or pure argon gas in a degassing box, and after degassing, the aluminum liquid was filtered and purified with a ceramic foam filter sheet.

[0069] (4) The purified aluminum liquid was sent to a casting and rolling mill and cast and rolled into billets with a thickness of 8.0 mm.

[0070] (5) The billet having a thickness of 8.0 mm was cold rolled to obtain a billet having a thickness of 4.0 mm.

[0071] (6) The 4.0 mm thick billet in (5) was homogenized at 470°C for 25 hours.

[0072] (7) The annealed billet was cold-rolled to a thickness of 0.5 mm, and then recrystallized at a temperature of 300°C for 15 hours.

[0073] (8) The recrystallization-annealed billet was rolled to a thickness of 12 μm to obtain an anisotropic positive electrode aluminum current collector.

[0074] Comparative Example 1 (1) An electrolytic aluminum melt was fed into a smelting furnace, and 30% of an aluminum ingot was added to the total weight of the electrolytic aluminum melt. The temperature of the melt was controlled at 770°C, and the mass percentages of the various elemental components in the melt were adjusted as follows: Si 0.15%, Fe 0.48%, Cu 0.13%, Mn 1.3%, Ti 0.03%, and the balance Al.

[0075] (2) The refining agent was blown into the molten material with pure nitrogen gas or pure argon gas, and the material was thoroughly and uniformly stirred. The refining time was 9 minutes, and the material was left to stand for 20 minutes. The dross on the surface of the aluminum liquid was removed, and the material was poured into a static furnace, and the temperature in the static furnace was controlled at 755°C.

[0076] (3) The aluminum liquid in the static furnace was sent into a trough, and aluminum titanium boron thread was added in the opposite direction to refine the crystal grains. After that, the aluminum liquid was degassed with pure nitrogen gas or pure argon gas in a degassing box, and after degassing, the aluminum liquid was filtered and purified with a ceramic foam filter sheet.

[0077] (4) The purified aluminum liquid was sent to a casting and rolling mill and cast and rolled into billets with a thickness of 8.0 mm.

[0078] (5) The billet having a thickness of 8.0 mm was cold rolled to obtain a billet having a thickness of 4.0 mm.

[0079] (6) The 4.0 mm thick billet in (5) was homogenized at 470°C for 25 hours.

[0080] (7) The annealed billet was cold-rolled to a thickness of 0.5 mm, and then recrystallized at a temperature of 300°C for 15 hours.

[0081] (8) The recrystallization-annealed billet was rolled to a thickness of 12 μm to obtain a positive electrode aluminum foil current collector.

[0082] The anisotropic positive electrode aluminum current collector prepared in Example 1 and the positive electrode aluminum foil current collector prepared in Comparative Example 1 were each fabricated into a ternary lithium battery with a capacity of 100 AH, and the cycle life and operating temperature of the ternary lithium battery were measured. The measurement results are shown in Table 1 below. [Table 1]

[0083] As can be seen from Table 1 above, the ternary lithium battery fabricated with the anisotropic positive aluminum current collector of Example 1 has a higher cycle life and a lower operating temperature than the ternary lithium battery fabricated with the positive aluminum foil current collector of Comparative Example 1. This indicates that the ternary lithium battery fabricated with the anisotropic positive aluminum current collector of Example 1 has a better heat dissipation effect than the ternary lithium battery fabricated with the positive aluminum foil current collector of Comparative Example 1.

[0084] The technical features of the above embodiments can be combined in any way. For the sake of simplicity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combinations of these technical features, they should all be considered within the scope of the present specification.

[0085] It should be understood that the above examples are merely descriptions of some embodiments of the present invention, and although the descriptions are specific and detailed, they do not limit the scope of the present invention. It should be noted that a person skilled in the art can make some modifications and improvements without departing from the concept of the present application, and all of these fall within the scope of protection of the present invention. Therefore, the scope of protection of the present application is determined by the appended claims.

Claims

1. providing an electrolytic aluminum solution and adding an aluminum ingot to the electrolytic aluminum solution to obtain a melt, wherein the elemental components of the melt include Si, Fe, Cu, Mn, Ti, Ni, Cr, and Al; adding a refining agent to the molten material to refine it and obtain an aluminum liquid; Casting and rolling the aluminum liquid in a casting and rolling mill to obtain a billet; cold rolling the billet and then homogenizing annealing it to obtain a first intermediate body; and recrystallizing annealing the first intermediate to obtain an anisotropic positive aluminum current collector, a first heat conductor is provided on the anisotropic positive aluminum current collector in a processing direction, a second heat conductor is provided on the anisotropic positive aluminum current collector in a transverse direction perpendicular to the processing direction, and a heat insulator is further provided on the anisotropic positive aluminum current collector, and the heat insulator is perpendicular to both the first heat conductor and the second heat conductor; A method for producing an anisotropic positive electrode aluminum current collector, comprising:

2. The mass percentages of the respective elemental components of the melt are: Si 0.1% to 0.15%, Fe 0.45% to 0.5%, Cu 0.1% to 0.15%, Mn 1.1% to 1.2%, Ti 0.02% to 0.04%, Ni 0.02% to 0.04%, Cr 0.02% to 0.04%, and the balance Al. The method for producing an anisotropic positive electrode aluminum current collector according to claim 1 .

3. After the first intermediate is recrystallized and annealed, a second intermediate is obtained, and the manufacturing method includes: further comprising rolling the second intermediate body to a predetermined thickness to obtain the anisotropic positive electrode aluminum current collector. The method for producing an anisotropic positive electrode aluminum current collector according to any one of claims 1 to 2.

4. The manufacturing method includes any one of the following (1) to (4): (1) the homogenization annealing temperature is 440°C to 490°C; (2) the homogenization annealing time is 20 hours to 30 hours; (3) the temperature of the recrystallization annealing is 270°C to 330°C; (4) The recrystallization annealing time is 12 hours to 19 hours. The method for producing an anisotropic positive electrode aluminum current collector according to any one of claims 1 to 2.

5. After obtaining the aluminum liquid and before casting and rolling the aluminum liquid with a casting and rolling mill, the manufacturing method includes: pouring the aluminum liquid into a static furnace and controlling the temperature in the static furnace to 750°C to 760°C; The aluminum liquid in the static furnace is sent to a trough, and aluminum titanium boron yarn is added in the reverse direction to refine the crystal grains; degassing the aluminum liquid in the trough with pure nitrogen gas or pure argon gas in a degassing box; and filtering and purifying the degassed aluminum liquid. The method for producing an anisotropic positive electrode aluminum current collector according to any one of claims 1 to 2.

6. 1. An anisotropic positive aluminum current collector containing nickel metal and chromium metal, a first heat conductor is provided on the anisotropic positive aluminum current collector in a processing direction, a second heat conductor is provided on the anisotropic positive aluminum current collector in a transverse direction perpendicular to the processing direction, and a heat insulator is further provided on the anisotropic positive aluminum current collector, and the heat insulator is perpendicular to both the first heat conductor and the second heat conductor; An anisotropic positive electrode aluminum current collector characterized by:

7. The anisotropic positive electrode aluminum current collector further contains Fe, Cu, Mn, Ti, and Al elements.

7. The anisotropic positive electrode aluminum current collector according to claim 6.

8. the anisotropic positive aluminum current collector has a difference in thermal conductivity between the direction in which the first heat transfer body is located and the direction in which the insulator is located that is greater than 0.5%, and / or a difference in thermal conductivity between the direction in which the second heat transfer body is located and the direction in which the insulator is located that is greater than 0.5%, and / or a difference in thermal conductivity between the direction in which the first heat transfer body is located and the direction in which the second heat transfer body is located that is greater than 0.5%; 7. The anisotropic positive electrode aluminum current collector according to claim 6.

9. the anisotropic positive electrode aluminum current collector has a total mass fraction of the nickel metal and the chromium metal of less than 1%; 7. The anisotropic positive electrode aluminum current collector according to claim 6.

10. The anisotropic positive electrode aluminum current collector includes any one of the following (1) and (2): (1) The thickness of the anisotropic positive electrode aluminum current collector is 4 μm to 20 μm, (2) the dyne value of the surface of the anisotropic positive electrode aluminum current collector is greater than 20; The anisotropic positive electrode aluminum current collector according to any one of claims 6 to 9.

11. The anisotropic positive electrode aluminum current collector includes any one of the following (1) to (5): (1) The anisotropic positive electrode aluminum current collector has a puncture strength of 50 gf or more, (2) The anisotropic positive electrode aluminum current collector has an elongation strength of 100 MPa or more in the processing direction, (3) The anisotropic positive electrode aluminum current collector has an elongation strength of 100 MPa or more in a transverse direction perpendicular to the processing direction, (4) The anisotropic positive electrode aluminum current collector has an elongation of 1% or more in the processing direction, (5) The anisotropic positive electrode aluminum current collector has an elongation of 1% or more in a transverse direction perpendicular to the processing direction. The anisotropic positive electrode aluminum current collector according to any one of claims 6 to 9.

12. An anisotropic positive electrode aluminum current collector manufactured by the manufacturing method according to any one of claims 1 to 5, or an anisotropic positive electrode aluminum current collector according to any one of claims 6 to 11. Electrochemical device characterized by:

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