CN108559878A - Battery case aluminum alloy strip and preparation method thereof - Google Patents
Battery case aluminum alloy strip and preparation method thereof Download PDFInfo
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- CN108559878A CN108559878A CN201810191116.6A CN201810191116A CN108559878A CN 108559878 A CN108559878 A CN 108559878A CN 201810191116 A CN201810191116 A CN 201810191116A CN 108559878 A CN108559878 A CN 108559878A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 13
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 238000005097 cold rolling Methods 0.000 claims description 82
- 239000000047 product Substances 0.000 claims description 38
- 230000007704 transition Effects 0.000 claims description 28
- 239000011265 semifinished product Substances 0.000 claims description 26
- 238000000137 annealing Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 14
- 238000010926 purge Methods 0.000 claims description 7
- 229910017435 S2 In Inorganic materials 0.000 claims 1
- 239000013078 crystal Substances 0.000 abstract description 9
- 230000000704 physical effect Effects 0.000 abstract description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/221—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by cold-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B2003/001—Aluminium or its alloys
Abstract
The invention discloses a kind of battery case aluminum alloy strip and preparation method thereof, the mass percent of chemical composition and each chemical composition that battery case aluminum alloy strip contains is as follows：Si：≤ 0.2%；Fe：0.5%~0.6%；Cu：0.05%~0.10%；Mn：0.06%~1.15%；Mg：≤ 0.03%；Zn：≤ 0.03%；Ti：0.02%~0.04%；Inevitable impurity element：≤ 0.15%；Surplus is Al.It can make its crystal grain uniformity, the diameter of crystal grain that can be less than 50 μm, ensure the physical properties requirement such as its tensile strength, yield strength and elongation percentage.
Description
Technical field
The present invention relates to a kind of battery case aluminum alloy strips and preparation method thereof.
Background technology
Currently, the shell of the lithium rechargeable battery of square, using aluminium sheet or aluminium alloy plate as raw material, by being pressed into
Type (the thinning molding of deep drawing) and manufacture, battery has the knot that electrode, partition board, electrolyte etc. are enclosed using the shell and lid
The engagement of structure, the shell and aluminum or lid made of aluminum alloy uses laser welding.
Therefore, to the aluminium sheet of battery case or aluminium alloy plate, it is desirable that the compression moulding as characteristic necessary to manufacture
Property, laser welding it is good, also require the strength durable after shell is made simultaneously good.The intensity of so-called shell is resistance to
Long property is not easy to be deformed because of external force specifically, referring to not expanding long-time uses, even if deformation is not easy to out
The characteristic in hole etc..
In recent years, it in order to make various running softwares, needs to improve battery capacity, demand shell is thinner and suitable for utensil
The shell of the wide shape of more slim width compared with prior art.
In the shell for enclosing battery, internal temperature rises to 85 DEG C or so.Internal pressure is generated in shell sometimes as a result, to lead
Cause case swells.Therefore, demand reduces such material expanded.In addition, can also enclose the electronic equipment of battery by
To external force.Under such circumstances, it is desirable to battery case not damaged, material for needing resistance to embedability high deformation.In addition,
Even if it is required that under shell state after molding by formed big intrusion external force when, be not easy to the characteristic of trepanning, certainly
Also require deformation drag big.From the aspect of the durability of battery case, high intensity is desired characteristic.
But for the material of high intensity, it is difficult to be shaped to have thin-walled and cover thickness is small, width and height are big
The shell of shape.The ratio of wide, i.e. cover the width/thickness of the thin width of shell is bigger, and the difficulty of mouldability more increases.
Invention content
The technical problem to be solved by the present invention is to overcome the deficiencies of existing technologies, a kind of battery case aluminium alloy plate is provided
Band, it can make its crystal grain uniformity, the diameter of crystal grain that can be less than 50 μm, ensure its tensile strength, yield strength and prolong
Stretch the physical properties requirement such as rate.
In order to solve the above-mentioned technical problem, the technical scheme is that：A kind of battery case aluminum alloy strip, it contains
Chemical composition and each chemical composition mass percent it is as follows：
Si：≤ 0.2%；
Fe：0.5%~0.6%；
Cu：0.05%~0.10%；
Mn：0.06%~1.15%；
Mg：≤ 0.03%；
Zn：≤ 0.03%；
Ti：0.02%~0.04%；
Inevitable impurity element：≤ 0.15%；
Surplus is Al, amounts to 100%.
The present invention also provides a kind of preparation method of battery case aluminum alloy strip, method includes to have the following steps：
S1：Obtain blank；
S2：Blank is handled by thick cold rolling and pinch pass, obtains the first semi-finished product；Wherein, thick cold rolling uses roughing roller
Group；Pinch pass uses finish rolling roller group；
S3：First semi-finished product obtain the second semi-finished product by annealing；Wherein, it in annealing process, first uses
Circulated air pair first semi-finished product at a temperature of 255 DEG C~265 DEG C carry out purging oil removing 5~7 hours, then at 345 DEG C~355 DEG C
At a temperature of annealing is carried out 4~6 hours to the first semi-finished product；
S4：Pinch pass again is carried out to the second semi-finished product to handle, and obtains third semi-finished product；
S5：Then finished product is obtained after third semi-finished product being cleaned, cut and packed successively.
Further, the thickness of blank is 7.5 ± 0.3mm, in step s 2, passes through thick cold rolling three times and primary essence successively
Cold-rolling treatment obtains the first semi-finished product；Wherein, the inlet thickness of thick cold rolling is 7.5 ± 0.3mm for the first time, for the first time thick cold rolling
Exit thickness be 5.1 ± 0.10mm；The inlet thickness of second of thick cold rolling is 5.1 ± 0.10mm, and second of thick cold rolling goes out
Mouth thickness is 3.5 ± 0.10mm；The inlet thickness of the thick cold rolling of third time is 3.5 ± 0.10mm, and the outlet of the thick cold rolling of third time is thick
Degree is 2.4 ± 0.05mm；The inlet thickness of first time pinch pass is 2.4 ± 0.05mm, and the exit thickness of first time pinch pass is
1.93±0.03mm；In step s 4, the inlet thickness of pinch pass is 1.93 ± 0.03mm, the again outlet of pinch pass again
Thickness is 1.2 ± 0.02mm.
Further, the roughness of the roughing roller of the roughing roller group is 0.4 ± 0.03um, the planishing roll of the finish rolling roller group
Roughness be 0.3 ± 0.03um.
The present invention also provides a kind of preparation method of battery case aluminum alloy strip, method includes to have the following steps：
B1：Obtain blank；
B2：Blank is handled by thick cold rolling and pinch pass, obtains First Transition product；Wherein, thick cold rolling uses roughing roller
Group；Pinch pass uses finish rolling roller group；
B3：First Transition product obtain the second transition product by annealing；Wherein, it in annealing process, first uses
Circulated air carries out purging oil removing 5~7 hours at a temperature of 255 DEG C~265 DEG C to First Transition product, then at 345 DEG C~355 DEG C
At a temperature of annealing is carried out 4~6 hours to First Transition product；
B4：Then finished product is obtained after the second transition product being cut and packed successively.
Further, the thickness of blank is 7.5 ± 0.3mm, in step B2, passes through thick cold rolling three times and twice essence successively
Cold-rolling treatment obtains First Transition product；Wherein, the inlet thickness of thick cold rolling is 7.5 ± 0.3mm for the first time, for the first time thick cold rolling
Exit thickness be 5.1 ± 0.10mm；The inlet thickness of second of thick cold rolling is 5.1 ± 0.10mm, and second of thick cold rolling goes out
Mouth thickness is 3.5 ± 0.10mm；The inlet thickness of the thick cold rolling of third time is 3.5 ± 0.10mm, and the outlet of the thick cold rolling of third time is thick
Degree is 2.4 ± 0.05mm；The inlet thickness of first time pinch pass is 2.4 ± 0.05mm, and the exit thickness of first time pinch pass is
1.7±0.03mm；The inlet thickness of second of pinch pass is 1.7 ± 0.03mm, and the exit thickness of second of pinch pass is 1.2
±0.02mm。
Further, the thickness of blank is 7.5 ± 0.3mm, in step B2, passes through thick cold rolling three times and twice essence successively
Cold-rolling treatment obtains First Transition product；Wherein, the inlet thickness of thick cold rolling is 7.5 ± 0.3mm for the first time, for the first time thick cold rolling
Exit thickness be 4.9 ± 0.10mm；The inlet thickness of second of thick cold rolling is 4.9 ± 0.10mm, and second of thick cold rolling goes out
Mouth thickness is 3.8 ± 0.10mm；The inlet thickness of the thick cold rolling of third time is 3.8 ± 0.10mm, and the outlet of the thick cold rolling of third time is thick
Degree is 2.4 ± 0.05mm；The inlet thickness of first time pinch pass is 2.4 ± 0.05mm, and the exit thickness of first time pinch pass is
1.55±0.03mm；The inlet thickness of second of pinch pass is 1.55 ± 0.03mm, and the exit thickness of second of pinch pass is
1.0±0.02mm。
Further, the roughness of the roughing roller of the roughing roller group is 0.4 ± 0.03um, the planishing roll of the finish rolling roller group
Roughness be 0.3 ± 0.03um.
After using above-mentioned technical proposal, this battery case that chemical composition and preparation method using the present invention are prepared
Meet GB/T3190 regulations with aluminium alloy plate, and the physical properties such as tensile strength, yield strength, elongation percentage conform to
It asks, crystal grain uniformity, crystal grain diameter is less than 50 μm, can be suitable for the preparation of battery case, good moldability.
Specific implementation mode
In order that the present invention can be more clearly and readily understood, below according to specific embodiment, to the present invention make into
One step is described in detail.
Embodiment one
The mass percent of a kind of battery case aluminum alloy strip, chemical composition and each chemical composition that it contains is as follows：
Si：0.1%；
Fe：0.5%；
Cu：0.05%；
Mn：0.06%；
Mg：0.01%；
Zn：0.01%；
Ti：0.02%；
Inevitable impurity element：0.05%；
Surplus is Al, amounts to 100%.
The preparation method of the battery case aluminum alloy strip, method include to have the following steps：
S1：Obtain blank；
S2：Blank is handled by thick cold rolling and pinch pass, obtains the first semi-finished product；Wherein, thick cold rolling uses roughing roller
Group；Pinch pass uses finish rolling roller group；
S3：First semi-finished product obtain the second semi-finished product by annealing；Wherein, it in annealing process, first uses
Circulated air pair first semi-finished product at a temperature of 260 DEG C carry out purging oil removing 6 hours, then the first half at a temperature of 350 DEG C pair
Finished product carries out annealing 5 hours；
S4：Pinch pass again is carried out to the second semi-finished product to handle, and obtains third semi-finished product；
S5：Then finished product is obtained after third semi-finished product being cleaned, cut and packed successively.
The thickness of blank is 7.5 ± 0.3mm, in step s 2, is handled successively by thick cold rolling three times and a pinch pass,
Obtain the first semi-finished product；Wherein, the inlet thickness of thick cold rolling is 7.5 ± 0.3mm for the first time, and the outlet of thick cold rolling is thick for the first time
Degree is 5.1 ± 0.10mm, and entrance tension is 50 ± 3KN, and outlet tension is 55 ± 3KN；The inlet thickness of thick cold rolling is for the second time
The exit thickness of 5.1 ± 0.10mm, second of thick cold rolling are 3.5 ± 0.10mm, and entrance tension is 50 ± 3KN, and outlet tension is
46±3KN；The inlet thickness of the thick cold rolling of third time is 3.5 ± 0.10mm, the exit thickness of the thick cold rolling of third time is 2.4 ±
0.05mm, entrance tension are 40 ± 3KN, and outlet tension is 35 ± 3KN；The inlet thickness of first time pinch pass be 2.4 ±
0.05mm, the exit thickness of first time pinch pass are 1.93 ± 0.03mm, and entrance tension is 31 ± 3KN, outlet tension is 28 ±
3KN；In step s 4, the inlet thickness of pinch pass is 1.93 ± 0.03mm again, and the exit thickness of pinch pass is 1.2 again
± 0.02mm, entrance tension are 25 ± 2KN, and outlet tension is 21 ± 2KN.
The roughness of the roughing roller of the roughing roller group be 0.4 ± 0.03um, the planishing roll of the finish rolling roller group it is coarse
Degree is 0.3 ± 0.03um.
By detection, tensile strength Rm can reach 120~150mpa, yield strength Rp0.2 >=100mpa, extend
Rate A50 >=6%, Vickers hardness >=54HV, crystal grain diameter are less than 50 μm, surface roughness：≤ 0.3 μm, physical property is equal
It meets the requirements.
Embodiment two
The mass percent of a kind of battery case aluminum alloy strip, chemical composition and each chemical composition that it contains is as follows：
Si：0.2%；
Fe：0.6%；
Cu：0.10%；
Mn：1.15%；
Mg：0.03%；
Zn：0.03%；
Ti：0.04%；
Inevitable impurity element：0.15%；
Surplus is Al, amounts to 100%.
The preparation method of the battery case aluminum alloy strip, method include to have the following steps：
B1：Obtain blank；
B2：Blank is handled by thick cold rolling and pinch pass, obtains First Transition product；Wherein, thick cold rolling uses roughing roller
Group；Pinch pass uses finish rolling roller group；
B3：First Transition product obtain the second transition product by annealing；Wherein, it in annealing process, first uses
Circulated air carries out purging oil removing 6 hours, then pair the first mistake at a temperature of 350 DEG C at a temperature of 260 DEG C to First Transition product
The product of crossing carry out annealing 5 hours；
B4：Then finished product is obtained after the second transition product being cut and packed successively.
The thickness of blank is 7.5 ± 0.3mm, in step B2, is handled successively by thick cold rolling three times and pinch pass twice,
Obtain First Transition product；Wherein, the inlet thickness of thick cold rolling is 7.5 ± 0.3mm for the first time, and the outlet of thick cold rolling is thick for the first time
Degree is 5.1 ± 0.10mm, and entrance tension is 50 ± 3KN, and outlet tension is 55 ± 3KN；The inlet thickness of thick cold rolling is for the second time
The exit thickness of 5.1 ± 0.10mm, second of thick cold rolling are 3.5 ± 0.10mm, and entrance tension is 50 ± 3KN, and outlet tension is
46±3KN；The inlet thickness of the thick cold rolling of third time is 3.5 ± 0.10mm, the exit thickness of the thick cold rolling of third time is 2.4 ±
0.05mm, entrance tension are 40 ± 3KN, and outlet tension is 35 ± 3KN；The inlet thickness of first time pinch pass be 2.4 ±
0.05mm, the exit thickness of first time pinch pass are 1.7 ± 0.03mm, and entrance tension is 31 ± 3KN, outlet tension is 28 ±
3KN；The inlet thickness of second of pinch pass is 1.7 ± 0.03mm, and the exit thickness of second of pinch pass is 1.2 ± 0.02mm,
Entrance tension is 25 ± 2KN, and outlet tension is 21 ± 2KN.
The roughness of the roughing roller of the roughing roller group be 0.4 ± 0.03um, the planishing roll of the finish rolling roller group it is coarse
Degree is 0.3 ± 0.03um.
By detection, tensile strength Rm can reach 105~120mpa, and yield strength Rp0.2 prolongs in 45~55mpa
Rate A50 >=38% is stretched, physical property meets the requirements, and crystal grain diameter is less than 50 μm, surface roughness：≤ 0.35μm.
Embodiment three
The mass percent of a kind of battery case aluminum alloy strip, chemical composition and each chemical composition that it contains is as follows：
Si：0.2%；
Fe：0.55%；
Cu：0.07%；
Mn：1.1%；
Mg：0.02%；
Zn：0.02%；
Ti：0.03%；
Inevitable impurity element：0.1%；
Surplus is Al, amounts to 100%.
The preparation method of the battery case aluminum alloy strip, method include to have the following steps：
B1：Obtain blank；
B2：Blank is handled by thick cold rolling and pinch pass, obtains First Transition product；Wherein, thick cold rolling uses roughing roller
Group；Pinch pass uses finish rolling roller group；
B3：First Transition product obtain the second transition product by annealing；Wherein, it in annealing process, first uses
Circulated air carries out purging oil removing 5 hours, then pair the first mistake at a temperature of 355 DEG C at a temperature of 260 DEG C to First Transition product
The product of crossing carry out annealing 6 hours；
B4：Then finished product is obtained after the second transition product being cut and packed successively.
The thickness of blank is 7.5 ± 0.3mm, in step B2, is handled successively by thick cold rolling three times and pinch pass twice,
Obtain First Transition product；Wherein, the inlet thickness of thick cold rolling is 7.5 ± 0.3mm for the first time, and the outlet of thick cold rolling is thick for the first time
Degree is 4.9 ± 0.10mm, and entrance tension is 50 ± 3KN, and outlet tension is 55 ± 3KN；The inlet thickness of thick cold rolling is for the second time
The exit thickness of 4.9 ± 0.10mm, second of thick cold rolling are 3.8 ± 0.10mm, and entrance tension is 50 ± 3KN, and outlet tension is
46±3KN；The inlet thickness of the thick cold rolling of third time is 3.8 ± 0.10mm, the exit thickness of the thick cold rolling of third time is 2.4 ±
0.05mm, entrance tension are 40 ± 3KN, and outlet tension is 35 ± 3KN；The inlet thickness of first time pinch pass be 2.4 ±
0.05mm, the exit thickness of first time pinch pass are 1.55 ± 0.03mm, and entrance tension is 31 ± 3KN, outlet tension is 28 ±
3KN；The inlet thickness of second of pinch pass is 1.55 ± 0.03mm, the exit thickness of second of pinch pass is 1.0 ±
0.02mm, entrance tension are 25 ± 3KN, and outlet tension is 21 ± 3KN.
The roughness of the roughing roller of the roughing roller group be 0.4 ± 0.03um, the planishing roll of the finish rolling roller group it is coarse
Degree is 0.3 ± 0.03um.
By detection, tensile strength Rm can reach 105~120mpa, and yield strength Rp0.2 prolongs in 45~55mpa
Rate A50 >=38% is stretched, physical property meets the requirements, and crystal grain diameter is less than 50 μm, surface roughness：≤ 0.35μm.
Particular embodiments described above, pair present invention solves the technical problem that, technical solution and advantageous effect carry out
It is further described, it should be understood that the above is only a specific embodiment of the present invention, is not limited to
The present invention, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in
Within protection scope of the present invention.
Claims (8)
1. a kind of battery case aluminum alloy strip, it is characterised in that the quality percentage of chemical composition and each chemical composition that it contains
Than as follows：
Si：≤ 0.2%；
Fe：0.5%~0.6%；
Cu：0.05%~0.10%；
Mn：0.06%~1.15%；
Mg：≤ 0.03%；
Zn：≤ 0.03%；
Ti：0.02%~0.04%；
Inevitable impurity element：≤ 0.15%；
Surplus is Al, amounts to 100%.
2. a kind of preparation method of battery case aluminum alloy strip as described in claim 1, it is characterised in that method includes
Following steps：
S1：Obtain blank；
S2：Blank is handled by thick cold rolling and pinch pass, obtains the first semi-finished product；Wherein, thick cold rolling uses roughing roller group；Essence
Cold rolling uses finish rolling roller group；
S3：First semi-finished product obtain the second semi-finished product by annealing；Wherein, in annealing process, circulated air is first used
Pair first semi-finished product carry out purging oil removing 5~7 hours at a temperature of 255 DEG C~265 DEG C, then in 345 DEG C~355 DEG C of temperature
Under annealing is carried out 4~6 hours to the first semi-finished product；
S4：Pinch pass again is carried out to the second semi-finished product to handle, and obtains third semi-finished product；
S5：Then finished product is obtained after third semi-finished product being cleaned, cut and packed successively.
3. preparation method according to claim 2, it is characterised in that：The thickness of blank is 7.5 ± 0.3mm, in step S2
In, successively by thick cold rolling three times and pinch pass processing, obtain the first semi-finished product；Wherein, the entrance of first time thick cold rolling
Thickness is 7.5 ± 0.3mm, and the exit thickness of thick cold rolling is 5.1 ± 0.10mm for the first time；The inlet thickness of thick cold rolling is for the second time
The exit thickness of 5.1 ± 0.10mm, second of thick cold rolling are 3.5 ± 0.10mm；The inlet thickness of the thick cold rolling of third time is 3.5 ±
The exit thickness of 0.10mm, the thick cold rolling of third time are 2.4 ± 0.05mm；The inlet thickness of first time pinch pass be 2.4 ±
The exit thickness of 0.05mm, first time pinch pass are 1.93 ± 0.03mm；In step s 4, the inlet thickness of pinch pass is again
1.93 ± 0.03mm, the exit thickness of pinch pass is 1.2 ± 0.02mm again.
4. preparation method according to claim 2, it is characterised in that：The roughness of the roughing roller of the roughing roller group is
The roughness of 0.4 ± 0.03um, the planishing roll of the finish rolling roller group are 0.3 ± 0.03um.
5. a kind of preparation method of battery case aluminum alloy strip as described in claim 1, it is characterised in that method includes
Following steps：
B1：Obtain blank；
B2：Blank is handled by thick cold rolling and pinch pass, obtains First Transition product；Wherein, thick cold rolling uses roughing roller group；Essence
Cold rolling uses finish rolling roller group；
B3：First Transition product obtain the second transition product by annealing；Wherein, in annealing process, circulated air is first used
Purging oil removing 5~7 hours is carried out to First Transition product at a temperature of 255 DEG C~265 DEG C, then in 345 DEG C~355 DEG C of temperature
Under annealing is carried out 4~6 hours to First Transition product；
B4：Then finished product is obtained after the second transition product being cut and packed successively.
6. preparation method according to claim 5, it is characterised in that：The thickness of blank is 7.5 ± 0.3mm, in step B2
In, successively by thick cold rolling three times and the processing of pinch pass twice, obtain First Transition product；Wherein, the entrance of first time thick cold rolling
Thickness is 7.5 ± 0.3mm, and the exit thickness of thick cold rolling is 5.1 ± 0.10mm for the first time；The inlet thickness of thick cold rolling is for the second time
The exit thickness of 5.1 ± 0.10mm, second of thick cold rolling are 3.5 ± 0.10mm；The inlet thickness of the thick cold rolling of third time is 3.5 ±
The exit thickness of 0.10mm, the thick cold rolling of third time are 2.4 ± 0.05mm；The inlet thickness of first time pinch pass be 2.4 ±
The exit thickness of 0.05mm, first time pinch pass are 1.7 ± 0.03mm；The inlet thickness of second of pinch pass be 1.7 ±
The exit thickness of 0.03mm, second of pinch pass are 1.2 ± 0.02mm.
7. preparation method according to claim 5, it is characterised in that：The thickness of blank is 7.5 ± 0.3mm, in step B2
In, successively by thick cold rolling three times and the processing of pinch pass twice, obtain First Transition product；Wherein, the entrance of first time thick cold rolling
Thickness is 7.5 ± 0.3mm, and the exit thickness of thick cold rolling is 4.9 ± 0.10mm for the first time；The inlet thickness of thick cold rolling is for the second time
The exit thickness of 4.9 ± 0.10mm, second of thick cold rolling are 3.8 ± 0.10mm；The inlet thickness of the thick cold rolling of third time is 3.8 ±
The exit thickness of 0.10mm, the thick cold rolling of third time are 2.4 ± 0.05mm；The inlet thickness of first time pinch pass be 2.4 ±
The exit thickness of 0.05mm, first time pinch pass are 1.55 ± 0.03mm；The inlet thickness of second of pinch pass be 1.55 ±
The exit thickness of 0.03mm, second of pinch pass are 1.0 ± 0.02mm.
8. preparation method according to claim 5, it is characterised in that：The roughness of the roughing roller of the roughing roller group is
The roughness of 0.4 ± 0.03um, the planishing roll of the finish rolling roller group are 0.3 ± 0.03um.
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