1. A method for preparing a battery cover plate explosion-proof sheet and a turnover sheet by using a 1-series aluminum alloy strip is characterized by comprising the following steps of: the aluminum alloy comprises the following 1-series aluminum alloy components in percentage by mass: less than or equal to 0.08wt% of Si, 0.20-0.32 wt% of Fe0.20-0.32 wt%, less than or equal to 0.01 wt% of Cu, less than or equal to 0.02 wt% of Mn, less than or equal to 0.01 wt% of Mg, less than or equal to 0.01 wt% of Cr, less than or equal to 0.02 wt% of Zn, 0.008-0.03 wt% of Tis, less than or equal to 0.01 wt% of other elements singly, and more than or equal to 99.60 wt% of Al.

2. A method for preparing a battery cover plate explosion-proof sheet and a turnover sheet by using a 1-series aluminum alloy strip is characterized by comprising the following steps of: the method comprises the following steps:

the method comprises the following steps: melting 99.85 of high-precision aluminum ingot AL, casting the ingot according to design components, strictly controlling the contents of Fe, Si and Ti, wherein the content of other elements is less than or equal to 0.01 wt% singly, and the content of Al is more than or equal to 99.60 wt%;

step two: carrying out homogenizing annealing on the cast ingot, keeping the temperature for 5-10h at the temperature of 580-610 ℃, then cooling to 480 ℃, and keeping the temperature for 2 h;

step three: taking out of the furnace and hot rolling into coiled materials with the thickness of 4-10 mm;

step four: cooling a hot-rolled coiled material with the thickness of 4-10 mm, rolling to the thickness of 2-5 mm, and annealing in a continuous air cushion furnace;

step five: and rolling the coiled material with the thickness of 2-5 mm to the thickness of a finished product, annealing to form an O state, and inspecting.

3. The method for preparing the battery cover plate explosion-proof sheet and the turnover sheet from the 1-series aluminum alloy strip according to claim 2, wherein the method comprises the following steps: the mass percentage of Fe is preferably 0.20-0.32 wt%, the mass percentage of Ti is preferably 0.008-0.03 wt%, the mass percentage of Si is preferably less than or equal to 0.08wt%, the mass percentage of other elements is preferably less than or equal to 0.01 wt%, and the mass percentage of Al is more than or equal to 99.60 wt%.

4. The method for preparing the battery cover plate explosion-proof sheet and the turnover sheet from the 1-series aluminum alloy strip according to claim 2, wherein the method comprises the following steps: and in the second step, the homogenizing annealing temperature range is 580-610 ℃, and the heat preservation is carried out for 5-10 hours.

5. The method for preparing the battery cover plate explosion-proof sheet and the turnover sheet from the 1-series aluminum alloy strip according to claim 2, wherein the method comprises the following steps: and in the third step, the hot rolling temperature is 270-310 ℃.

6. The method for preparing the battery cover plate explosion-proof sheet and the turnover sheet from the 1-series aluminum alloy strip according to claim 2, wherein the method comprises the following steps: and in the fourth step, the annealing temperature is 460-520 ℃, and the heat preservation time is 20-60 s.

Background

With the new energy industry, the lithium battery industry is rapidly developed and widely applied to the fields of power, energy storage and digital. The explosion-proof sheet and the turnover sheet on the battery cover plate are used as important parts on the battery and can directly influence the most critical index of the battery performance, namely the safety, so that the stability of the performance of the explosion-proof sheet and the turnover sheet is very important, and the aluminum materials for the explosion-proof sheet and the turnover sheet are required to have excellent stamping, welding, corrosion resistance and stable explosion pressure.

The 1-series alloy has excellent forming performance, corrosion resistance and welding performance, is widely used in conductor materials and instrument materials with low strength, and in order to obtain stable explosion pressure, the material must have fine and uniform microstructures, such as fine grains and fine and dispersed intermetallic compounds. Tiny and uniform crystal grains and tissues are guaranteed through a special processing technology, so that a 1-series aluminum alloy material which has excellent stamping, welding, corrosion resistance and stable explosion pressure and is used for battery cover plate explosion-proof sheets and turnover sheets and a processing technology thereof are needed to be developed.

Therefore, it is necessary to invent a method for preparing a battery cover plate explosion-proof sheet and a turnover sheet from a 1-series aluminum alloy strip to solve the above problems.

Disclosure of Invention

The invention aims to provide a method for preparing a battery cover plate explosion-proof sheet and a turnover sheet by using a 1-series aluminum alloy strip, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a method for preparing a battery cover plate explosion-proof sheet and a turnover sheet from a 1-series aluminum alloy strip comprises the following 1-series aluminum alloy components in percentage by mass: less than or equal to 0.08wt% of Si, 0.20-0.32 wt% of Fe0.20-0.32 wt%, less than or equal to 0.01 wt% of Cu, less than or equal to 0.02 wt% of Mn, less than or equal to 0.01 wt% of Mg, less than or equal to 0.01 wt% of Cr, less than or equal to 0.02 wt% of Zn, 0.008-0.03 wt% of Tis, less than or equal to 0.01 wt% of other elements singly, and more than or equal to 99.60 wt% of Al.

Preferably, the method comprises the following steps:

the method comprises the following steps: melting 99.85 of high-precision aluminum ingot AL, casting the ingot according to design components, strictly controlling the contents of Fe, Si and Ti, wherein the content of other elements is less than or equal to 0.01 wt% singly, and the content of Al is more than or equal to 99.60 wt%;

step two: carrying out homogenizing annealing on the cast ingot, keeping the temperature for 5-10h at the temperature of 580-610 ℃, then cooling to 480 ℃, and keeping the temperature for 2 h;

step three: taking out of the furnace and hot rolling into coiled materials with the thickness of 4-10 mm;

step four: cooling a hot-rolled coiled material with the thickness of 4-10 mm, rolling to the thickness of 2-5 mm, and annealing in a continuous air cushion furnace;

step five: and rolling the coiled material with the thickness of 2-5 mm to the thickness of a finished product, annealing to form an O state, and inspecting.

Preferably, the mass percentage of Fe is preferably 0.20-0.32 wt%, the mass percentage of Ti is preferably 0.008-0.03 wt%, the mass percentage of Si is preferably less than or equal to 0.08wt%, the mass percentage of other elements is preferably less than or equal to 0.01 wt%, and the mass percentage of Al is more than or equal to 99.60 wt%.

Preferably, the homogenizing annealing temperature in the second step is 580-610 ℃, and the temperature is kept for 5-10 h.

Preferably, the hot rolling temperature in the third step is 270-310 ℃.

Preferably, in the fourth step, the annealing temperature is 460-520 ℃, and the heat preservation time is 20-60 s.

The invention has the technical effects and advantages that:

the invention relates to a preparation method of 1-series aluminum alloy with deep drawing, corrosion resistance, good welding performance and stable blasting pressure. By adjusting the contents of alloy elements and trace elements and controlling the processing technology, the microscopic grains and the microstructure of the material are finely controlled, and finally the material has the effects of stable blasting performance, deep drawability, corrosion resistance, good weldability and the like.

Drawings

FIG. 1 is a schematic diagram of the grain size and distribution of the surface of the embodiment of the present invention.

FIG. 2 is a schematic diagram of the size and distribution of compounds on the surface of an example of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a method for preparing a battery cover plate explosion-proof sheet and a turnover sheet by using a 1-series aluminum alloy strip, which is characterized by comprising the following steps of: the aluminum alloy comprises the following 1-series aluminum alloy components in percentage by mass: less than or equal to 0.08wt% of Si, 0.20-0.32 wt% of Fe0.20-0.32 wt%, less than or equal to 0.01 wt% of Cu, less than or equal to 0.02 wt% of Mn, less than or equal to 0.01 wt% of Mg, less than or equal to 0.01 wt% of Cr, less than or equal to 0.02 wt% of Zn, 0.008-0.03 wt% of Tis, less than or equal to 0.01 wt% of other elements singly, and more than or equal to 99.60 wt% of Al.

Further, in the above technical solution, the method comprises the following steps:

the method comprises the following steps: melting 99.85 of high-precision aluminum ingot AL, casting the ingot according to design components, strictly controlling the contents of Fe, Si and Ti, wherein the content of other elements is less than or equal to 0.01 wt% singly, and the content of Al is more than or equal to 99.60 wt%;

step two: carrying out homogenizing annealing on the cast ingot, keeping the temperature for 5-10h at the temperature of 580-610 ℃, then cooling to 480 ℃, and keeping the temperature for 2 h;

step three: taking out of the furnace and hot rolling into coiled materials with the thickness of 4-10 mm;

step four: cooling a hot-rolled coiled material with the thickness of 4-10 mm, rolling to the thickness of 2-5 mm, and annealing in a continuous air cushion furnace;

step five: and rolling the coiled material with the thickness of 2-5 mm to the thickness of a finished product, annealing to form an O state, and inspecting.

Further, in the technical scheme, the mass percentage of Fe is preferably 0.20-0.32 wt%, the mass percentage of Ti is preferably 0.008-0.03 wt%, the mass percentage of Si is preferably less than or equal to 0.08wt%, the mass percentage of other elements is preferably less than or equal to 0.01 wt%, and Al is more than or equal to 99.60 wt%;

further, in the technical scheme, the homogenizing annealing temperature range in the second step is 580-610 ℃, and the temperature is kept for 5-10 hours;

further, in the technical scheme, the hot rolling temperature in the third step is 270-310 ℃;

further, in the technical scheme, in the fourth step, the annealing temperature is 460-520 ℃, and the heat preservation time is 20-60 s.

It should be noted that:

fe in the 1 series aluminum alloy is a main alloying element and can form with matrix Al and Si: the FeAl3, α (AlFeSi), and β (AlFeSi) phases act as solid solution strengthening, and improve the alloy strength. When the content of Fe element is high, the formed compounds have many phases and are accumulated at the crystal boundary, the compounds are not tightly combined with the Al matrix, when the subsequent processing deformation is carried out, fracture is easily formed at the crystal boundary, the stamping processing performance of the compounds is influenced, meanwhile, the consistency of the material structure is also influenced, the stability of the explosion value of the finished explosion-proof sheet and the turnover sheet is adversely influenced, if the content of Fe is lower, the strength and the plasticity of the material are reduced, the stamping deformation of the explosion-proof sheet and the turnover sheet is not facilitated, and the content of Fe is verified to be controlled to be 0.20-0.32 wt%. Si element is impurity element generally, free Si is formed when the Si content is high, the free Si is hard and brittle, and the plasticity of the material is reduced, so the content is controlled to be less than or equal to 0.08wt percent generally.

The Ti element mainly plays a role in grain refinement, the content is generally controlled to be 0.008-0.03%, the effect of grain refinement is poor when the content is too high, when the content is more than 0.03%, the grain refinement effect reaches a saturated state, redundant Ti particles cannot play a role in grain refinement, and meanwhile, the cost is increased. Other impurity elements can form hard and brittle phase compounds with the Al matrix to reduce the plasticity of the aluminum alloy material, so that the content of a single element is required to be less than or equal to 0.01 wt%, and the content of Al is more than or equal to 99.60 wt%.

After obtaining the 1-series aluminum alloy ingot with the components, sawing and milling the ingot, and then performing subsequent processing:

(1) carrying out homogenizing annealing on the cast ingot, keeping the temperature for 5-10h at the temperature of 580-610 ℃, then cooling to 480 ℃, keeping the temperature for 2h,

discharging and hot rolling into coiled materials with the thickness of 4-10 mm, and controlling the final rolling temperature of the hot rolling to be 270-310 ℃.

(2) And cooling the hot-rolled coiled material with the thickness of 4-10 mm, rolling to the thickness of 2-5 mm, and annealing in a continuous air cushion furnace at the annealing temperature of 460-520 ℃ for 20-60 s.

(3) And rolling the coiled material with the thickness of 2-5 mm to the thickness of a finished product, annealing to form an O state, and delivering after the coiled material is qualified.

Through the above components and process control, 1-series aluminum alloy material micro crystal grains and tissues are fine and uniformly distributed, as shown in the grain size and distribution (average 31 μm) on the surface of FIG. 1 and the compound size and distribution (2-9 μm) on the surface of FIG. 2, the material has small anisotropy and good stability during processing deformation, the blasting value range after the explosion-proof sheet and the turnover sheet are manufactured is less than or equal to 0.05MPa, and the tensile strength of the material in macroscopic performance is as follows: 70-80 MPa, yield strength: 20-40 MPa, elongation: 40-50%, completely meets the stamping requirements of the explosion-proof sheet and the turnover sheet, and has corrosivity and weldability matched with the existing cover plate material for the battery.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.