CN103911527B - A kind of casing of lithium ion battery aluminium alloy and preparation method thereof - Google Patents
A kind of casing of lithium ion battery aluminium alloy and preparation method thereof Download PDFInfo
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- CN103911527B CN103911527B CN201410128391.5A CN201410128391A CN103911527B CN 103911527 B CN103911527 B CN 103911527B CN 201410128391 A CN201410128391 A CN 201410128391A CN 103911527 B CN103911527 B CN 103911527B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The present invention provides a kind of casing of lithium ion battery aluminium alloy, the composition of this aluminium alloy and weight percentage are Si:0.4 0.5%, Fe:1.1 1.3, Mn:0.25 0.4, Mg:0.03 0.045, Nb:0.004 0.005, Ga:0.1 0.2, mixed rare-earth elements RE:0.01 0.03, surplus is aluminum and inevitable impurity unit, additionally provide its preparation method simultaneously, mainly include that raw material prepares, aluminium ingot melting, Alloying Treatment, refine and continuous casting, the steps such as rolling and heat treatment, it is excellent that the aluminium alloy of the present invention has mouldability, intensity is high, the advantage that ductility is prone to processing the most simultaneously.
Description
Technical field
The present invention relates to a kind of casing of lithium ion battery aluminium alloy and preparation method thereof.
Background technology
Aluminium alloy not only has the features such as light weight, intensity is high, ductility is good, has the premium properties such as strong, the easy machine-shaping of corrosion stability concurrently simultaneously.Cause
This, aluminium alloy is widely used in fields such as Aero-Space, automobile, steamer and electronic products, becomes developing national economy and improves people
The important foundation material of people's material and culture life, and in defence and military modernization, vehicles lightweight and national economy high speed sustainable development
Occupy an important position.Particularly the survival and development the world today mankind are faced with resource, the energy, environment, the sternness of security problems are chosen
War, therefore, accelerated development aluminum i ndustry and aluminum alloy materials process technology have great strategic importance.
The parts assembled in mobile phone or notebook computer, are strongly required its light weight, thus aluminium alloy is widely used in the material of exterior i.e. shell of battery
Material, currently in order to meet miniaturization and the lightweight thereof etc. of battery, the sheathing material to the rectangular lithium ion battery wherein used, A3003 to be used
Aluminium alloy plate replaces steel plate originally or corrosion resistant plate.The shell of rectangular cell uses laser welding technology, seals with fine aluminium or aluminium alloy plate.But
The shell being made up of this material, is susceptible to deformation, the most easily produces the problems such as expansion.
By the drawing of multiple operations and thinning drawing is combined and in the rectangular cell shell of molding, Al-Mn class A3003 aluminium alloy, is permissible
The raw material of shell thin-walled property can be made while keeping the apparent condition of the glossiness beauty of tool, but the lithium ion battery of discharge and recharge is repeated, its
The most intrinsic pressure can rise when reaction, temperature also rises, therefore battery case material to bear the internal pressure produced because it uses environment is drawn
The tensile stress risen.Under this use environment, the Al-Mn class aluminum alloy plate materials generation deformation of creep, result produces the thickness of battery case to be increased (swollen
Swollen) problem.When this thickness deformation amount is big, then there is the worry that machine is produced impact (fault, breakage etc.).
In recent years, it is desirable to lithium ion battery more lightweight, high capacity, square shaped battery case also required that further thin-walled property.Thin-walled property
Increase with internal volume is directly related, is the key factor seeking battery behavior high capacity, increases in the case of the overall dimensions keeping battery case
Add the research topic that the miniaturization under its internal volume, or identical capacity becomes.It addition, the strictest to the allowable error of thickness, therefore it is required that
Raw-material high performance.
Summary of the invention
It is an object of the invention to overcome the deficiency of existing aluminium alloy, it is provided that a kind of mouldability is excellent, intensity is high, ductility is prone to processing the most simultaneously
Casing of lithium ion battery aluminium alloy and preparation method thereof.
The above-mentioned purpose of the present invention can be achieved by following technical proposals, a kind of casing of lithium ion battery aluminium alloy, the group of this aluminium alloy
Become and weight percentage be Si:0.4-0.5%, Fe:1.1-1.3, Mn:0.25-0.4, Nb:0.004-0.005, Mg:0.03-0.045, Ga:
0.1-0.2, mixed rare-earth elements RE:0.01-0.03, surplus is aluminum and inevitable impurity element；The preparation method of this aluminium alloy includes walking as follows
Rapid:
(1) raw material prepares: select the purity aluminium ingot more than or equal to 99.9%, and silicon, ferrum, manganese, magnesium, niobium and gallium select aluminum silicon intermediate alloy respectively,
Ferro-aluminum intermediate alloy, aluminum manganese intermediate alloy, magnalium intermediate alloy, aluminum niobium intermediate alloy and the form of gallium, and mischmetal and fine aluminium ingot exist
Smelting into rare earth aluminium ingot mixing intermediate in crucible, wherein mischmetal accounts for the 10-12% of mixing intermediate；
(2) aluminium ingot melting: aluminium ingot is put into and has been heated to after the vertical fusing stove of 850-880 DEG C is molten into aluminum liquid, being transferred to be heated to
In the holding furnace of 760-780 DEG C；
(3) Alloying Treatment: be initially charged described mixing intermediate in aluminum liquid, stirring, add aluminum silicon intermediate alloy, aluminum after fully dissolving
Ferrum intermediate alloy, aluminum manganese intermediate alloy, magnalium intermediate alloy, gallium and aluminum stannum intermediate alloy carry out alloying；
(4) refine and continuous casting: with 0.65-0.8% hexachlorethane at twice with refined alloy liquid at 2/3rds under bell jar press-in alloy molten solution face, it
After be stirred, mixing time is 20-30min, stands after 30min, deaerated and be casting continuously to form ingot casting after filtering；
(5) rolling and heat treatment: carry out Homogenization Treatments at a temperature of 520-550 DEG C, hot rolling at a temperature of 490-520 DEG C, the most cold rolling, carry out
Intermediate annealing processes, and described intermediate annealing is to be heated to 450-480 DEG C with the firing rate of 100 DEG C/min, after keeping 60-120s, with 280 DEG C/min
Rate of cooling cooling, finally carry out finish to gauge, the thickness of finish to gauge determines according to the demand of product.
As present invention further optimization, lanthanum in the component of mixed rare-earth elements: 20-30%, cerium: 20-30%, scandium: 10-20, ytterbium: 10-20,
Yttrium: 5-10, neodymium: 5-10.
It is Si:0.45% as present invention further optimization, the composition of described aluminium alloy and weight percentage, Fe:1.1, Mn:0.3, Mg:
0.04, Nb:0.0045, Ga:0.16, mixed rare-earth elements RE:0.018.
It is Si:0.48% as present invention further optimization, the composition of described aluminium alloy and weight percentage, Fe:1.2, Mn:0.2, Mg:
0.05, Nb:0.005, Ga:0.1, mixed rare-earth elements RE:0.02.
In the present invention, Si controls at 0.4-0.5%, adds silicon and can generate Mg2Si phase, even if also being able to ensure foot under the conditions of poor heat treatment
Enough alloying elements enter in solid solution, strengthen the intensity of aluminium alloy；In the present invention, Fe controls at 1.1-1.3%, can affect when iron content is higher than 1.3
The electrical property of alloy, during less than 1.1, the raising effect to performances such as the heat resistance of aluminium alloy, plasticity is little.In the present invention, Mn controls
0.25-0.4%, manganese can improve the recrystallization temperature of aluminium alloy, refines recrystal grain.In the present invention, Mg controls at 0.03-0.045%, this model
Enclosing interior content of magnesium can the thermostability of maximized raising aluminium alloy and electric conductivity.In the present invention, Nb controls at 0.004-0.005%, and niobium can increase
The corrosion resistance of strength aluminum alloy, can also play the rotten and effect of refinement simultaneously.In the present invention, Ga controls at 0.1-0.2%, it is possible to be obviously improved aluminum
The heat resistance of alloy, and on the basis of ensureing heat resistance, improve intensity.In the present invention, mixed rare-earth elements controls at 0.01-0.03%, it is possible to
Purification, crystal grain thinning, and improve electric conductivity, mixed rare-earth elements need not too much, and intensity and lumber recovery can be made during more than 0.03% on the contrary to decline.
The present invention is by optimized alloy composition and accurately controls above-mentioned composition at specific content range, also by conservative control processing step and technique ginseng
Number, it is ensured that alloy has good mouldability, tensile strength, yield strength, ductility are excellent, thus meet the performance need of casing of lithium ion battery
Ask.
Detailed description of the invention
Embodiment 1
Selecting the purity aluminium ingot more than or equal to 99.9%, silicon, ferrum, manganese, magnesium, niobium and gallium select aluminum silicon intermediate alloy respectively, ferro-aluminum intermediate alloy,
Aluminum manganese intermediate alloy, magnalium intermediate alloy, aluminum niobium intermediate alloy and the form of gallium, and mischmetal are smelted into dilute with fine aluminium ingot in crucible
Soil aluminium ingot mixing intermediate, wherein mischmetal accounts for the 10% of mixing intermediate；Aluminium ingot is put into the vertical fusing stove fusing being heated to 860 DEG C
After aluminum liquid, it is transferred to be heated in the holding furnace of 770 DEG C；Described mixing intermediate it is initially charged in aluminum liquid, stirring, add again after fully dissolving
Enter aluminum silicon intermediate alloy, ferro-aluminum intermediate alloy, aluminum manganese intermediate alloy, magnalium intermediate alloy, gallium and aluminum stannum intermediate alloy and carry out alloying；With
0.65% hexachlorethane with refined alloy liquid at 2/3rds under bell jar press-in alloy molten solution face, is stirred at twice afterwards, and mixing time is 20min,
Stand after 30min, deaerated and be casting continuously to form ingot casting after filtering；Homogenization Treatments is carried out at a temperature of 520 DEG C, hot rolling at a temperature of 490 DEG C, afterwards
Cold rolling, carry out intermediate annealing process, described intermediate annealing is to be heated to 470 DEG C with the firing rate of 100 DEG C/min, after keeping 90s, with 280 DEG C/min
Rate of cooling cooling, finally carry out finish to gauge, the thickness of finish to gauge determines according to the demand of product.Composition and the weight percentage of final aluminium alloy are
Si:0.45%, Fe:1.1, Mn:0.3, Mg:0.04, Nb:0.0045, Ga:0.16, mixed rare-earth elements RE:0.018.
Embodiment 2
Selecting the purity aluminium ingot more than or equal to 99.9%, silicon, ferrum, manganese, magnesium, niobium and gallium select aluminum silicon intermediate alloy respectively, ferro-aluminum intermediate alloy,
Aluminum manganese intermediate alloy, magnalium intermediate alloy, aluminum niobium intermediate alloy and the form of gallium, and mischmetal are smelted into dilute with fine aluminium ingot in crucible
Soil aluminium ingot mixing intermediate, wherein mischmetal accounts for the 12% of mixing intermediate；Aluminium ingot is put into the vertical fusing stove fusing being heated to 880 DEG C
After aluminum liquid, it is transferred to be heated in the holding furnace of 780 DEG C；Described mixing intermediate it is initially charged in aluminum liquid, stirring, add again after fully dissolving
Enter aluminum silicon intermediate alloy, ferro-aluminum intermediate alloy, aluminum manganese intermediate alloy, magnalium intermediate alloy, gallium and aluminum stannum intermediate alloy and carry out alloying；With
0.7% hexachlorethane with refined alloy liquid at 2/3rds under bell jar press-in alloy molten solution face, is stirred at twice afterwards, and mixing time is 20min,
Stand after 30min, deaerated and be casting continuously to form ingot casting after filtering；Homogenization Treatments is carried out at a temperature of 550 DEG C, hot rolling at a temperature of 500 DEG C, afterwards
Cold rolling, carry out intermediate annealing process, described intermediate annealing is to be heated to 460 DEG C with the firing rate of 100 DEG C/min, after keeping 100s, with 280 DEG C/min
Rate of cooling cooling, finally carry out finish to gauge, the thickness of finish to gauge determines according to the demand of product.Composition and the weight percentage of final aluminium alloy are
Si:0.5%, Fe:1.2, Mn:0.35, Mg:0.045, Nb:0.004, Ga:0.1, mixed rare-earth elements RE:0.03.
Embodiment 3
Selecting the purity aluminium ingot more than or equal to 99.9%, silicon, ferrum, manganese, magnesium, niobium and gallium select aluminum silicon intermediate alloy respectively, ferro-aluminum intermediate alloy,
Aluminum manganese intermediate alloy, magnalium intermediate alloy, aluminum niobium intermediate alloy and the form of gallium, and mischmetal are smelted into dilute with fine aluminium ingot in crucible
Soil aluminium ingot mixing intermediate, wherein mischmetal accounts for the 10-12% of mixing intermediate；Aluminium ingot is put into the vertical fusing stove being heated to 850-880 DEG C
After being inside molten into aluminum liquid, it is transferred to be heated in the holding furnace of 760-780 DEG C；Described mixing intermediate it is initially charged in aluminum liquid, stirring, fully
Add aluminum silicon intermediate alloy, ferro-aluminum intermediate alloy, aluminum manganese intermediate alloy, magnalium intermediate alloy, gallium and aluminum stannum intermediate alloy after dissolving to carry out
Alloying；With 0.65-0.8% hexachlorethane at twice with refined alloy liquid at 2/3rds under bell jar press-in alloy molten solution face, it is stirred afterwards,
Mixing time is 20-30min, stands after 30min, deaerated and be casting continuously to form ingot casting after filtering；Homogenization Treatments is carried out at a temperature of 520-550 DEG C,
Hot rolling at a temperature of 490-520 DEG C, the most cold rolling, carry out intermediate annealing process, described intermediate annealing is to be heated to the firing rate of 100 DEG C/min
450-480 DEG C, after keeping 60-120s, cooling down with the rate of cooling of 280 DEG C/min, finally carry out finish to gauge, the thickness of finish to gauge is according to the demand of product
Determine.Composition and the weight percentage of final aluminium alloy are Si:0.4%, Fe:1.1, Mn:0.25, Mg:0.04, Nb:0.0045, Ga:
0.2, mixed rare-earth elements RE:0.015.
Alloy in embodiment 1-3 forms and performance test is as shown in table 1,2.
Table 1
Table 2
| Numbering | Percentage elongation | Tensile strength MPa | 0.2% yield strength | Mouldability |
| Embodiment 1 | 9 | 268 | 470 | Pass through |
| Embodiment 2 | 7 | 260 | 465 | Pass through |
| Embodiment 3 | 8 | 258 | 458 | Pass through |
Above content is to combine concrete preferred implementation further description made for the present invention, it is impossible to assert being embodied as only of the present invention
It is confined to these explanations.For general technical staff of the technical field of the invention, make some without departing from the inventive concept of the premise
Substitute or obvious modification, and performance or purposes are identical, all should be considered as belonging to protection scope of the present invention.
Claims (3)
1. a casing of lithium ion battery aluminium alloy, it is characterised in that: the composition weight percentage of described aluminium alloy is Si:0.4-0.5%,
Fe:1.1-1.3%, Mn:0.25-0.4%, Mg:0.03-0.045%, Nb:0.004-0.005%, Ga:0.1-0.2%, mixed rare-earth elements
RE:0.01-0.03%, surplus is aluminum and inevitable impurity element；The preparation method of described aluminium alloy comprises the steps:
(1) raw material prepares: selecting the purity aluminium ingot more than or equal to 99.9%, silicon, ferrum, manganese, magnesium, niobium and gallium select aluminum silicon intermediate alloy, ferro-aluminum respectively
Intermediate alloy, aluminum manganese intermediate alloy, magnalium intermediate alloy, aluminum niobium intermediate alloy and the form of gallium, and mischmetal and fine aluminium ingot are at earthenware
Smelting into rare earth aluminium ingot mixing intermediate in crucible, wherein mischmetal accounts for the 10-12% of mixing intermediate；
(2) aluminium ingot melting: aluminium ingot is put into and has been heated to after the vertical fusing stove of 850-880 DEG C is molten into aluminum liquid, being transferred to be heated to 760-780 DEG C
In holding furnace；
(3) Alloying Treatment: be initially charged described mixing intermediate in aluminum liquid, stirring, add aluminum silicon intermediate alloy, in the middle of ferro-aluminum after fully melting
Alloy, aluminum manganese intermediate alloy, magnalium intermediate alloy, gallium and aluminum niobium intermediate alloy carry out alloying；
(4) refine and continuous casting: with 0.65-0.8% hexachlorethane at twice with refined alloy liquid at 2/3rds under bell jar press-in alloy molten solution face, laggard
Row stirring, mixing time is 20-30min, stands after 30min, deaerated and be casting continuously to form ingot casting after filtering；
(5) rolling and heat treatment: carry out Homogenization Treatments at a temperature of 520-550 DEG C, hot rolling at a temperature of 490-520 DEG C, the most cold rolling, carry out centre and move back
Fire processes, and described intermediate annealing is to be heated to 450-480 DEG C with the firing rate of 100 DEG C/min, after keeping 60-120s, with 280 DEG C/min's
Rate of cooling cools down, and finally carries out finish to gauge, and the thickness of finish to gauge determines according to the demand of product.
2. casing of lithium ion battery aluminium alloy as claimed in claim 1, it is characterised in that: lanthanum in the component of described mixed rare-earth elements: 20-30%,
Cerium: 20-30%, scandium: 10-20%, ytterbium: 10-20%, yttrium: 5-10%, neodymium: 5-10%.
3. casing of lithium ion battery aluminium alloy as claimed in claim 1 or 2, it is characterised in that: the composition of described aluminium alloy and weight percentage
For Si:0.45%, Fe:1.1%, Mn:0.3%, Mg:0.04%, Nb:0.0045%, Ga:0.16%, mixed rare-earth elements RE:
0.018%, surplus is aluminum and inevitable impurity element.
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| CN104561673B (en) * | 2014-12-30 | 2016-08-17 | 长安大学 | A kind of rare earth modified aluminum alloy anode sheet and preparation method thereof |
| CN108838206B (en) * | 2018-06-07 | 2020-02-07 | 银邦金属复合材料股份有限公司 | Method for improving performance of aluminum stainless steel composite board and aluminum stainless steel composite board |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103261461A (en) * | 2011-02-02 | 2013-08-21 | 日本轻金属株式会社 | Aluminum alloy sheet for battery case having good moldability and weldability |
| CN103469015A (en) * | 2013-08-12 | 2013-12-25 | 安徽盛达前亮铝业有限公司 | Production technology of battery cover aluminum alloy sheet |
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| JP5116255B2 (en) * | 2005-06-09 | 2013-01-09 | 東洋アルミニウム株式会社 | Packaging material and electrical / electronic structure member using aluminum alloy |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103261461A (en) * | 2011-02-02 | 2013-08-21 | 日本轻金属株式会社 | Aluminum alloy sheet for battery case having good moldability and weldability |
| CN103469015A (en) * | 2013-08-12 | 2013-12-25 | 安徽盛达前亮铝业有限公司 | Production technology of battery cover aluminum alloy sheet |
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Address after: 312300. B36 building, B03 building, Shishi Plaza Business Garden, Xiao Yue town, Shangyu District, Zhejiang, Shaoxing, China Applicant after: SHAOXING ANKA AUTO PARTS CO., LTD. Applicant after: Lin Daosong Address before: 312300. B36 building, B03 building, Shishi Plaza Business Garden, Xiao Yue town, Shangyu District, Zhejiang, Shaoxing, China Applicant before: Shangyu peace card trailer accessory company limited Applicant before: Lin Daosong |
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Effective date of registration: 20170704 Address after: 202, room 38, 510095 Dan Shui Road, Whampoa District, Guangdong, Guangzhou Co-patentee after: Shen Guopei Patentee after: Guangzhou manganese light lithium battery technology Co., Ltd. Address before: 312300. B36 building, B03 building, Shishi Plaza Business Garden, Xiao Yue town, Shangyu District, Zhejiang, Shaoxing, China Co-patentee before: Lin Daosong Patentee before: SHAOXING ANKA AUTO PARTS CO., LTD. |