CN115842206A - Aluminum alloy plate for lithium ion battery and battery shell - Google Patents
Aluminum alloy plate for lithium ion battery and battery shell Download PDFInfo
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- CN115842206A CN115842206A CN202210124078.9A CN202210124078A CN115842206A CN 115842206 A CN115842206 A CN 115842206A CN 202210124078 A CN202210124078 A CN 202210124078A CN 115842206 A CN115842206 A CN 115842206A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 108
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 16
- 238000003466 welding Methods 0.000 claims abstract description 87
- 239000002994 raw material Substances 0.000 claims abstract description 21
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 10
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 18
- 239000012535 impurity Substances 0.000 claims description 13
- 230000035515 penetration Effects 0.000 claims description 13
- 230000001681 protective effect Effects 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 abstract description 30
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 29
- 239000002893 slag Substances 0.000 abstract description 6
- 238000002360 preparation method Methods 0.000 description 15
- 239000003292 glue Substances 0.000 description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 11
- 238000013461 design Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 238000007789 sealing Methods 0.000 description 9
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 239000007788 liquid Substances 0.000 description 8
- 229920001296 polysiloxane Polymers 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 238000004026 adhesive bonding Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000010073 coating (rubber) Methods 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 229910001148 Al-Li alloy Inorganic materials 0.000 description 2
- FCVHBUFELUXTLR-UHFFFAOYSA-N [Li].[AlH3] Chemical compound [Li].[AlH3] FCVHBUFELUXTLR-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000001989 lithium alloy Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910018565 CuAl Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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- 239000007858 starting material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
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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 application relates to the technical field of batteries, in particular to an aluminum alloy plate for a lithium ion battery and a battery shell, wherein the aluminum alloy plate comprises raw materials of Li, al, mn, si and Cu, wherein the weight percentage of Li is 0.5-3.0 wt%, and the weight percentage of Al is 96.5-99 wt%. This application aluminum alloy plate for lithium ion battery can promote the rigidity of current battery aluminum hull through doping lithium metal in aluminum alloy plate, can promote the resistant deformability of battery aluminum hull, improves electric core plane degree, alleviates battery case weight simultaneously, further promotes the volume energy density of electric core. Meanwhile, the laser welding power of the plate can be reduced, the probability of welding slag generation is reduced, and the welding efficiency is improved.
Description
Technical Field
The application relates to the technical field of batteries, in particular to an aluminum alloy plate for a lithium ion battery and a battery shell.
Background
In order to meet the requirements of high capacity and light weight of lithium ion batteries, lithium ion battery manufacturers often adopt aluminum materials to prepare battery shells so as to reduce the wall thickness of the battery shells. However, the aluminum material has low strength, and is easy to deform after being prepared into a battery shell, so that the flatness of the battery shell is poor, the flatness of the battery shell can cause the blue-coated film to have folded bubbles, the gluing thickness is uneven when an assembly module is glued, and the problems of insufficient gluing area and glue overflow are caused. In the correlation technique, in order to solve the above-mentioned problem that the battery aluminum hull easily takes place to warp and leads to, generally can set up bearing structure in the aluminum hull, but set up bearing structure in the aluminum hull and need occupy the aluminum hull inner space, influence weight and volume energy density.
Disclosure of Invention
The application provides an aluminum alloy plate for a lithium ion battery and a battery shell, which aim to solve the problem that the existing battery aluminum shell is easy to deform.
According to a first aspect of the present application, the present application provides an aluminum alloy sheet for a lithium ion battery, the aluminum alloy sheet comprises, as raw materials, li, al, mn, si, and Cu, wherein the weight percentage of Li is 0.5wt% to 3.0wt%, and the weight percentage of Al is 96.5wt% to 99wt%.
Through doping lithium metal in aluminum alloy plate, can promote the rigidity of current battery aluminum hull, can promote the resistant deformability of battery aluminum hull, improve electric core plane degree, alleviate battery case weight simultaneously, further promote the volume energy density of electric core. Meanwhile, the laser welding power of the plate can be reduced, the probability of welding slag generation is reduced, and the welding efficiency is improved. By limiting the mass percentage of Li in the aluminum alloy plate to be 0.5wt% -3.0 wt%, the deformation resistance of the aluminum alloy plate can be ensured, and the manufacturing cost and the impact strength of the whole aluminum alloy plate can also be ensured. When the mass percentage of Li in the aluminum alloy plate is less than 0.5wt%, the deformation resistance of the aluminum alloy plate is not ideal, and when the mass percentage of Li in the aluminum alloy plate is more than 3wt%, the manufacturing cost of the whole battery aluminum shell is affected, and meanwhile, the impact strength is poor.
In one possible design, the raw material of the aluminum alloy plate comprises 0.04-1.5 wt% of Mn, less than 0.6wt% of Si, and 0.05-0.2 wt% of Cu.
In one possible design, the raw material of the aluminum alloy plate further comprises Fe, and the weight percentage of Fe is less than 0.7wt%.
In one possible design, the aluminum alloy plate consists of the following raw materials in percentage by mass: li:0.5wt% -2.0 wt%, al:96.5wt% -99.0 wt%, mn:0.04wt% -1.5 wt%, si less than 0.6wt%, fe less than 0.7wt%, cu:0.05wt% to 0.2wt% and unavoidable impurities < 0.2wt%.
According to a second aspect of the present application, there is also provided a battery case, including a case body and a case bottom, the case bottom being connected to a bottom of the case body; the shell body and the shell bottom are both prepared from the aluminum alloy plate.
The shell body and the shell bottom of limiting the battery shell are both made of the aluminum alloy plate, so that the deformation resistance of the battery shell can be improved, the flatness of the battery can be improved, the welding power between the shell body and other parts can be reduced, and the welding efficiency can be improved.
In one possible embodiment, the housing body comprises two oppositely disposed first side walls and two oppositely disposed second side walls; the thickness of the first side wall is 0.4-0.8 mm; the thickness of the second side wall is 0.6-1.0 mm.
In one possible design, the thickness of the shell bottom is 1.0 to 1.8mm.
In one possible design, the battery case further includes a top cover welded to the top of the case body.
In one possible design, the top cover is made of the aluminum alloy plate material described above in the present application.
In one possible design, the welding is laser welding.
In one possible design, the laser welding power is 700W to 950W.
In one possible embodiment, the laser welding also satisfies at least one of the following features (1) to (3):
(1) The effective penetration of laser welding is 350-450 μm;
(2) The welding speed of laser welding is 100 mm/s-200 mm/s;
(3) The protective gas flow of laser welding is 70L/min-80L/min.
The beneficial effect of this application:
this application aluminum alloy plate for lithium ion battery can promote the rigidity of current battery aluminum hull through doping lithium metal in aluminum alloy plate, can promote the resistant deformability of battery aluminum hull, improves electric core plane degree, alleviates battery case weight simultaneously, further promotes the volume energy density of electric core. Meanwhile, the laser welding power of the plate can be reduced, the probability of welding slag generation is reduced, and the welding efficiency is improved. By limiting the mass percentage of Li in the aluminum alloy plate to be 0.5wt% -3.0 wt%, the deformation resistance of the aluminum alloy plate can be ensured, and the manufacturing cost and the impact strength of the whole aluminum alloy plate can also be ensured.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
Fig. 1 is a schematic structural diagram of a battery case in the prior art;
fig. 2 is a schematic structural diagram of a battery case provided in the present application in a first embodiment;
fig. 3 is a schematic structural diagram of a battery case provided in the present application in a second embodiment.
Reference numerals are as follows:
1-shell body;
11-a first side wall;
12-a second side wall;
2,2' -shell bottom;
3-a top cover;
4-a support belt;
5-adhesive glue.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Detailed Description
For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.
It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be noted that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.
The lithium ion battery has the advantages of light weight, small volume, large capacitance, high charging speed and the like, and is widely applied to various digital and communication products such as notebook computers, mobile phones, digital cameras and the like and vehicles such as electric bicycles, electric automobiles and the like. With the development of these products, the lithium ion battery has been required to have high capacity and light weight, and in order to meet the above requirements, lithium ion battery manufacturers often use aluminum materials to prepare battery cases to reduce the wall thickness of battery cases. However, the strength of the aluminum material is low, and after the aluminum material is prepared into a battery shell, the flatness of the battery shell is poor due to the fact that the internal and external pressure intensity difference is easy to deform, so that wrinkling bubbles are easy to occur on a blue-coated film, the gluing thickness is uneven when a module is assembled, and the problems of insufficient gluing area and glue overflow are caused.
Among the correlation technique, in order to solve the battery aluminum hull and easily take place to warp and gluing thickness is inhomogeneous when leading to the equipment module rubber coating, and then lead to the problem that the moulding area is not enough and overflow to glue, like the battery case shown in fig. 1, generally can set up a plurality of support bands 4 on the shell bottom 2' of battery case, be equipped with the clearance between the adjacent support band 4, the clearance is used for setting up bonding glue 5, support the not enough of 2' plane degree at the bottom of the shell that 4's setting can effectively compensate battery case, make the packing that bonding glue 5 can be abundant between battery module and battery case, and make rubber coating thickness more even through the clearance between restriction battery case and the battery module, the difficult problem of control of rubber coating thickness has effectively been solved. However, such a design requires space inside the aluminum case, which affects the weight and volumetric energy density of the battery case.
The applicant researches and discovers that lithium metal can be doped in the material of the aluminum shell of the battery so as to improve the rigidity of the aluminum shell of the battery, improve the planeness of the battery cell, reduce the weight of the battery shell and further improve the volume energy density of the battery cell.
Based on the above consideration, in order to solve the problem that the existing battery aluminum case is easy to deform, the applicant has conducted intensive research and designed an aluminum alloy plate for a lithium ion battery, which comprises Li, al, mn, si and Cu, wherein the weight percentage of Li is 0.5wt% to 3.0wt%, and the weight percentage of Al is 96.5wt% to 99wt%.
The aluminum alloy plate takes aluminum as a main material, and is doped with lithium metal, so that the aluminum alloy plate has the characteristics of low density, high strength, better corrosion resistance, fatigue resistance, proper ductility and the like.
The aluminum alloy plate disclosed by the embodiment of the application can be but is not limited to be used for preparing components such as a battery shell, a top cover, a module end plate and a packaging lower box body, and the components are not easy to deform.
The embodiment of the application provides an aluminum alloy plate for a lithium ion battery, which comprises Li, al, mn, si and Cu, wherein the weight percentage of Li is 0.5-3.0 wt%, and the weight percentage of Al is 96.5-99 wt%.
Alternatively, the weight percentage content of Li in the aluminum alloy sheet material may be 0.5wt%, 0.8wt%, 1.0wt%, 1.2wt%, 1.5wt%, 1.8wt%, 2.0wt%, 2.2wt%, 2.5wt%, 2.8wt%, 3.0wt%, etc., and may be other values within the above range, which is not limited herein. The Al content in the aluminum alloy sheet may be 96.5wt%, 97.0wt%, 97.5wt%, 98wt%, 98.5wt%, or 99wt%, or the like, and may be other values within the above range, which is not limited herein.
Understandably, the metal activity of Li is strong, li is the metal with the minimum density, li is added into the aluminum alloy plate, the extensibility of the plate can be improved, the flatness of a battery cell can be improved, the weight of a battery shell can be lightened, the volume energy density of the battery cell can be further improved, and Li can enable aluminum to form a compound (such as Mg) with other metals 5 Al 8 ) Uniform deposition, improved welding performance, reduced laser welding power, and reduced generation probability of welding slag. Mn is added into the aluminum alloy plate to prevent the recrystallization process of the aluminum alloy and improveThe recrystallization temperature can obviously refine recrystallized grains and improve the ductility, and the other function is to dissolve other impurities (such as iron) to form (Fe, mn) Al 6 And the harmful effects of other impurities are reduced. Si improves the strength of the aluminum alloy sheet, so that the aluminum alloy sheet has excellent casting performance and corrosion resistance. Cu is an important alloy element in the aluminum alloy plate, has certain solid solution strengthening effect and is CuAl precipitated by aging 2 Has obvious aging strengthening effect.
Through doping lithium metal in aluminum alloy plate, can promote the rigidity of current battery aluminum hull, can promote the resistant deformability of battery aluminum hull, improve electric core plane degree, alleviate battery case weight simultaneously, further promote the volume energy density of electric core. Meanwhile, the laser welding power of the plate can be reduced, the probability of welding slag generation is reduced, and the welding efficiency is improved. By limiting the mass percentage of Li in the aluminum alloy plate to be 0.5wt% -3.0 wt%, the deformation resistance of the aluminum alloy plate can be ensured, and the manufacturing cost and the impact strength of the whole aluminum alloy plate can also be ensured. When the mass percentage of Li in the aluminum alloy plate is less than 0.5wt%, the deformation resistance of the aluminum alloy plate is not ideal, and when the mass percentage of Li in the aluminum alloy plate is more than 3wt%, the manufacturing cost of the whole battery aluminum shell is affected, and meanwhile, the impact strength is poor.
According to some embodiments of the present application, the aluminum alloy sheet material comprises 0.04wt% to 1.5wt% of Mn, less than 0.6wt% of Si, and 0.05wt% to 0.2wt% of Cu.
Alternatively, the Cu content of 0.05wt% to 0.2wt% may be 0.04wt%, 0.05wt%, 0.08wt%, 1wt%, 1.2wt%, 1.4wt%, or 1.5wt%, etc., and may be other values within the above range, which is not limited herein. The weight percentage of Si in the aluminum alloy sheet may be 0wt%, 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, or 0.6wt%, etc., and may be other values within the above range, which is not limited herein. The weight percentage of Fe in the aluminum alloy sheet may be 0wt%, 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt%, or 0.7wt%, etc., but may be other values within the above range, and is not limited thereto. The Cu content in the aluminum alloy sheet material may be 0.05wt%, 0.08wt%, 0.1wt%, 0.12wt%, 0.15wt%, 0.18wt%, 0.2wt%, etc., and may be other values within the above range, which is not limited herein. The inevitable impurities may be contained in the aluminum alloy sheet material in an amount of 0wt%, 0.08wt%, 0.1wt%, 0.12wt%, 0.15wt%, 0.18wt%, or 0.2wt%, etc., and may be other values within the above-mentioned range, which is not limited herein.
It is understood that when the Mn content is more than 1.5wt% in the raw material of the aluminum alloy sheet, the aluminum alloy sheet may have an excessively large ductility, resulting in a tendency of deformation of the aluminum alloy sheet. When the weight percentage of Si in the raw material of the aluminum alloy sheet is greater than 0.6wt%, the solid solubility of the sheet increases, which is not favorable for processing and softening, and the sheet is unfavorable for forming, which also deteriorates the laser welding performance of the sheet. When the weight percentage of Cu in the raw materials of the aluminum alloy plate is more than 0.2wt%, the solid solubility of the plate is increased, and the plate is not beneficial to processing and softening.
According to some embodiments of the present application, the starting material for the aluminum alloy sheet further comprises Fe, the weight percentage of Fe being < 0.7 wt.%.
Alternatively, the weight percentage of Fe is 0wt%, 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt%, or 0.7wt%, etc., although other values within the above range are possible and not limited herein.
It can be understood that Fe is added into the aluminum alloy plate, fe and Al can form a fine intermetallic compound to play a role in dispersion strengthening and promotion of grain formation and nucleation refinement, and Fe, al and Mn form an AlFeMn compound to improve the corrosion resistance of the plate.
According to some embodiments of the present application, the raw materials of the aluminum alloy plate comprise the following raw materials by mass: li:0.5wt% -2.0 wt%, al:96.5wt% -99.0 wt%, mn:0.04wt% -1.5 wt%, si less than 0.6wt%, fe less than 0.7wt%, cu:0.05wt% to 0.2wt% and unavoidable impurities < 0.2wt%.
Unavoidable impurities are elements outside the controlled range and are inevitably mixed in from metal raw materials, recovered materials, and the like. Typical unavoidable impurity elements are, for example, zn, V, etc., and the inevitable impurities are controlled to be in the range of < 0.2wt%, and even if elements outside the controlled range are included, the effect of the present invention is not inhibited.
By limiting the mass percentage of Li in the aluminum alloy plate to be 0.5wt% -2.0 wt%, the deformation resistance of the aluminum alloy plate can be ensured, and the manufacturing cost and the impact strength of the whole aluminum alloy plate can be ensured.
The embodiment of the present application further provides a battery case, as shown in fig. 2, the battery case includes a case body 1 and a case bottom 2, and the case bottom 2 is connected to the bottom of the case body 1. The shell body 1 and the shell bottom 2 are both prepared from the aluminum alloy plate.
The cross section of the shell body 1 can be square or round, and the like, but can also be other shapes.
The shell body 1 and the shell bottom 2 of limiting the battery shell are both made of the aluminum alloy plate, so that the deformation resistance of the battery shell can be improved, the flatness of a battery is improved, the welding power between the shell body and other parts can be reduced, and the welding efficiency is improved.
According to some embodiments of the present application, the housing body 1 comprises two oppositely disposed first side walls 11 and two oppositely disposed second side walls 12. The thickness of the first side wall is 0.4 mm-0.8 mm. The thickness of the second side wall is 0.6 mm-1.0 mm.
It will be appreciated that the cross-section of the housing body 1 is square, and in some embodiments, the cross-section of the housing body 1 is rectangular, wherein the first side wall is a side wall corresponding to a long side of the rectangle and the second side wall is a side wall corresponding to a short side of the rectangle. Alternatively, the thickness of the first sidewall may be 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc., and may also be other values within the above range, which is not limited herein. The thickness of the second sidewall may be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, etc., and may be other values within the above range, which is not limited herein.
Because the characteristics of battery shell shape, the difference can exist in the interior external pressure difference that each lateral wall of battery shell received, through the limited to the first lateral wall of shell body and second lateral wall thickness to the lateral wall that makes the battery shell different position can have the same or similar resistant deformability, in order to adapt to corresponding interior external pressure difference, guarantees that each side of battery shell has the same or similar plane degree, the folding bubble can not appear in the package blue membrane, the inhomogeneous problem of rubber coating thickness when the equipment module rubber coating.
According to some embodiments of the present application, the thickness of the shell bottom 2 is 1.0 to 1.8mm.
Alternatively, the thickness of the bottom may be 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, etc., or may be other values within the above range, which is not limited herein.
Through the limited thickness of the shell bottom, the shell bottom is adapted to the corresponding internal and external pressure difference, the shell bottom and the side wall of the battery shell are guaranteed to have the same or similar flatness, and the problems that the blue-coated film is folded and bubbles occur and the gluing thickness is not uniform when a module is assembled for gluing can be avoided.
According to some embodiments of the present application, as shown in fig. 3, the battery case further includes a top cover 3, and the top cover 3 is welded to the top of the case body 1.
According to some embodiments of the present application, the top cover 3 is made of the aluminum alloy sheet material described above in the present application.
Through adopting the foretell aluminum alloy plate of this application preparation with top cap 3 to form, can improve top cap 3's resistant deformability, improve the plane degree of battery, can also reduce the welding power between shell 1 and the top cap 3, improve welding efficiency.
According to some embodiments of the present application, the manner of welding is laser welding.
Laser welding is an efficient and precise welding method using a laser beam with high energy density as a heat source. The welding process belongs to a heat conduction type, namely, the surface of a workpiece is heated by laser radiation, the surface heat is diffused inwards through heat conduction, and the workpiece is melted by controlling parameters such as the width, the energy, the peak power, the repetition frequency and the like of laser pulse to form a specific molten pool.
The advantages of high speed, large depth and small deformation of laser welding are utilized, so that the top cover and the shell body of the battery shell can achieve a better welding effect, and the battery shell is ensured to have a more excellent sealing effect.
According to some embodiments of the present application, the laser welding power is 700W to 950W.
Alternatively, the power of the laser welding may be 700W, 750W, 800W, 850W, 900W, 950W, etc., and may also be other values within the above range, which is not limited herein.
Compare in prior art, the laser welding power of this application is lower, can effectively reduce the probability that the welding slag produced like this, improves the feature of environmental protection that battery case made.
According to some embodiments of the present application, the laser welding has an effective penetration ranging from 350 μm to 450 μm.
Alternatively, the effective penetration of the laser welding may be 350 μm, 360 μm, 370 μm, 380 μm, 390 μm, 400 μm, 410 μm, 420 μm, 430 μm, 440 μm, 450 μm, etc., or may be other values within the above range, which is not limited herein.
According to some embodiments of the present application, the laser welding is performed at a welding speed of 100mm/s to 200mm/s.
Alternatively, the welding speed of the laser welding may be 100mm/s, 110mm/s, 120mm/s, 130mm/s, 140mm/s, 150mm/s, 160mm/s, 170mm/s, 180mm/s, 190mm/s, 200mm/s, etc., or may be other values within the above range, which is not limited herein.
According to some embodiments of the present application, the shielding gas flow for laser welding is 70L/min to 80L/min.
Optionally, the flow rate of the protective gas for laser welding may be 70L/min, 71L/min, 72L/min, 73L/min, 74L/min, 75L/min, 76L/min, 77L/min, 78L/min, 79L/min, or 80L/min, etc., or may be other values within the above range, which is not limited herein.
Through the restriction to effective penetration, welding speed and protective gas flow among the laser welding process, can reach better welding effect.
According to some embodiments of the present application, as shown in fig. 2, the present application discloses a battery case including a case body 1 and a case bottom 2, the case bottom 2 being connected to a bottom of the case body 1. The shell body 1 and the shell bottom 2 are both prepared from the aluminum alloy plate. The length, width and height of the shell body 1 are 148mm, 85.8mm and 102.85mm respectively, and the shell body 1 comprises two oppositely arranged first side walls 11 and two oppositely arranged second side walls 12. The thickness of the first side wall 11 is 0.6mm, the thickness of the second side wall 12 is 0.8mm, and the thickness of the case bottom 2 is 1.2mm.
The shell body 1 and the shell bottom 2 of limiting the battery shell are both made of the aluminum alloy plate, so that the deformation resistance of the battery shell can be improved, the flatness of a battery is improved, the welding power between the shell body and other parts can be reduced, and the welding efficiency is improved.
The present invention will be described in detail with reference to the following specific examples.
Example 1
The embodiment provides a battery case, battery case's shell 1, shell bottom 2 and top cap, shell 1 and shell bottom 2 all adopt the above-mentioned aluminum alloy plate preparation of this application, and the top cap is formed by the aluminum alloy plate preparation that does not contain Li, wherein, comprises following mass percent's raw materials in the aluminum alloy plate: li:0.5wt%, al:99%, others are Mn, si and Cu. The length, width and height of the shell body 1 are 148mm, 85.8mm and 102.85mm respectively. The shell body 1 is welded with a top cover with the thickness of 2.5mm by laser welding, the welding power is 950W, the effective penetration is 400 mu m, the welding speed is 150mm/s, and the flow of protective gas is 75L/min. After the shell body 1 and the top cover are welded, a silicone tube 15cm long is connected with the top cover liquid injection hole after the airtightness test, and AB glue is used for sealing. The battery case was kept in a free state, and the deformation amount of the battery case was measured by uniformly applying air pressures of 0.05,0.1,0.2,0.3,0.4,0.5,0.6, and 0.7MPa, and maintaining the pressure for 30S, respectively. The results are shown in tables one and two.
Example 2
The embodiment provides a battery case, battery case's shell 1, shell bottom 2 and top cap, shell 1 and shell bottom 2 all adopt the above-mentioned aluminum alloy plate preparation of this application, and the top cap is formed by the aluminum alloy plate preparation that does not contain Li, wherein, comprises following mass percent's raw materials in the aluminum alloy plate: li:3.0wt%, al:96.5%, others are Mn, si and Cu. The length, width and height of the shell body 1 are 148mm, 85.8mm and 102.85mm respectively. The shell body 1 is welded with a top cover with the thickness of 2.5mm by laser welding, the welding power is 950W, the effective penetration is 400 mu m, the welding speed is 150mm/s, and the flow of protective gas is 75L/min. After the shell body 1 and the top cover are welded, a silicone tube 15cm long is connected with the top cover liquid injection hole after the airtightness test, and AB glue is used for sealing. The battery case was kept in a free state, and air pressures of 0.05,0.1,0.2,0.3,0.4,0.5,0.6,0.7mpa were uniformly applied for 30S, and the deformation amount of the battery case was measured for each air pressure. The results are shown in tables one and two.
Example 3
The embodiment provides a battery case, battery case's shell 1, shell bottom 2 and top cap, shell 1 and shell bottom 2 all adopt the above-mentioned aluminum alloy plate preparation of this application, and the top cap is formed by the aluminum alloy plate preparation that does not contain Li, wherein, comprises following mass percent's raw materials in the aluminum alloy plate: li:2wt%, al:97%, others are Mn, si and Cu. The length, width and height of the shell body 1 are 148mm, 85.8mm and 102.85mm respectively. The shell body 1 is welded with a top cover with the thickness of 2.5mm by laser welding, the welding power is 950W, the effective penetration is 400 mu m, the welding speed is 150mm/s, and the flow of protective gas is 75L/min. After the shell body 1 and the top cover are welded, a silicone tube 15cm long is connected with the top cover liquid injection hole after the airtightness test, and AB glue is used for sealing. The battery case was kept in a free state, and the deformation amount of the battery case was measured by uniformly applying air pressures of 0.05,0.1,0.2,0.3,0.4,0.5,0.6, and 0.7MPa, and maintaining the pressure for 30S, respectively. The results are shown in tables one and two.
Example 4
The embodiment provides a battery case, battery case's shell 1, shell bottom 2 and top cap, shell 1 and shell bottom 2 all adopt the above-mentioned aluminium lithium alloy panel preparation of this application, and the top cap is formed by the aluminium alloy panel preparation that does not contain Li, wherein, comprises following mass percent's raw materials in the aluminium lithium alloy panel: li:0.5wt%, al:97wt%, mn:0.04wt% -1.5 wt%, si less than 0.6wt%, fe less than 0.7wt%, cu:0.05wt% to 0.2wt% and unavoidable impurities < 0.2wt%. The length, width and height of the shell body 1 are 148mm, 85.8mm and 102.85mm respectively. The shell body 1 is welded with a top cover with the thickness of 2.5mm by laser welding, the welding power is 950W, the effective penetration is 400 mu m, the welding speed is 150mm/s, and the flow of protective gas is 75L/min. After the shell body 1 and the top cover are welded, a silicone tube 15cm long is connected with the top cover liquid injection hole after the airtightness test, and AB glue is used for sealing. The battery case was kept in a free state, and the deformation amount of the battery case was measured by uniformly applying air pressures of 0.05,0.1,0.2,0.3,0.4,0.5,0.6, and 0.7MPa, and maintaining the pressure for 30S, respectively. The results are shown in tables one and two.
Example 5
The embodiment provides a battery case, battery case's shell 1, shell bottom 2 and top cap, shell 1 and shell bottom 2 all adopt the above-mentioned aluminum alloy plate preparation of this application, and the top cap is formed by the aluminum alloy plate preparation that does not contain Li, wherein, comprises following mass percent's raw materials in the aluminum alloy plate: li:1.0wt%, al:97wt%, mn:0.04wt% -1.5 wt%, si less than 0.6wt%, fe less than 0.7wt%, cu:0.05wt% to 0.2wt% and unavoidable impurities < 0.2wt%. The length, width and height of the shell body 1 are 148mm, 85.8mm and 102.85mm respectively. The shell body 1 is welded with a top cover with the thickness of 2.5mm by laser welding, the welding power is 900W, the effective penetration is 400 mu m, the welding speed is 150mm/s, and the flow of protective gas is 75L/min. After the shell body 1 and the top cover are welded, a silicone tube 15cm long is connected with a top cover liquid injection hole after an airtight test is carried out, and AB glue is used for sealing. The battery case was kept in a free state, and the deformation amount of the battery case was measured by uniformly applying air pressures of 0.05,0.1,0.2,0.3,0.4,0.5,0.6, and 0.7MPa, and maintaining the pressure for 30S, respectively. The results are shown in tables one and two.
Example 6
The embodiment provides a battery case, battery case's shell 1, shell bottom 2 and top cap, shell 1 and shell bottom 2 all adopt the above-mentioned aluminum alloy plate preparation of this application, and the top cap is formed by the aluminum alloy plate preparation that does not contain Li, wherein, comprises following mass percent's raw materials in the aluminum alloy plate: li:2.0wt%, al:97wt%, mn:0.04wt% -1.5 wt%, si less than 0.6wt%, fe less than 0.7wt%, cu:0.05wt% to 0.2wt% and unavoidable impurities < 0.2wt%. The length, width and height of the shell body 1 are 148mm, 85.8mm and 102.85mm respectively. The shell body 1 is welded with a top cover with the thickness of 2.5mm by laser welding, the welding power is 800W, the effective penetration is 400 mu m, the welding speed is 150mm/s, and the flow of protective gas is 75L/min. After the shell body 1 and the top cover are welded, a silicone tube 15cm long is connected with the top cover liquid injection hole after the airtightness test, and AB glue is used for sealing. The battery case was kept in a free state, and air pressures of 0.05,0.1,0.2,0.3,0.4,0.5,0.6,0.7mpa were uniformly applied for 30S, and the deformation amount of the battery case was measured for each air pressure. The results are shown in tables one and two.
Example 7
The embodiment provides a battery case, battery case's shell 1, shell bottom 2 and top cap, shell 1 and shell bottom 2 all adopt the above-mentioned aluminum alloy plate preparation of this application, and the top cap is formed by the aluminum alloy plate preparation that does not contain Li, wherein, comprises following mass percent's raw materials in the aluminum alloy plate: li:3wt%, al:96.5%, mn:0.04wt% -1.5 wt%, si less than 0.6wt%, fe less than 0.7wt%, cu:0.05wt% to 0.2wt% and unavoidable impurities < 0.2wt%. The length, width and height of the shell body 1 are 148mm, 85.8mm and 102.85mm respectively. The shell body 1 is welded with a top cover with the thickness of 2.5mm by laser welding, the welding power is 700W, the effective penetration is 400 mu m, the welding speed is 150mm/s, and the flow of protective gas is 75L/min. After the shell body 1 and the top cover are welded, a silicone tube 15cm long is connected with the top cover liquid injection hole after the airtightness test, and AB glue is used for sealing. The battery case was kept in a free state, and air pressures of 0.05,0.1,0.2,0.3,0.4,0.5,0.6,0.7mpa were uniformly applied for 30S, and the deformation amount of the battery case was measured for each air pressure. The results are shown in tables one and two.
Comparative example
The comparative example provides a battery case having a case body, a case bottom, and a top cover, which are all made of an aluminum alloy sheet material not containing Li. The shell body is welded with a top cover with the thickness of 2.5mm by laser welding, the welding power is 1100W, the effective penetration is 400 mu m, the welding speed is 150mm/s, and the flow of protective gas is 75L/min. After the shell body 1 and the top cover are welded, a silicone tube 15cm long is connected with the top cover liquid injection hole after the airtightness test, and AB glue is used for sealing. The battery case was kept in a free state, and the deformation amount of the battery case was measured by uniformly applying air pressures of 0.05,0.1,0.2,0.3,0.4,0.5,0.6, and 0.7MPa, and maintaining the pressure for 30S, respectively. The results are shown in tables one and two.
Table one: comparative table of deformation amount of battery case of examples and comparative examples under different atmospheric pressures
Table two: comparative table of deformation amount of battery case of examples and comparative examples under different atmospheric pressures
From the experimental data in tables I and II, it can be seen that the weight of the battery case made of the aluminum alloy plate material is reduced by 9.82% -27.8% compared with the traditional battery aluminum case. The battery shell manufactured by the aluminum alloy plate has excellent deformation resistance, and compared with the traditional battery aluminum shell, when the weight percentage content of Li in the aluminum alloy plate is more than 0.5wt%, the deformation resistance of the shell bottom of the battery shell manufactured by the aluminum alloy plate is improved by 3% -9.5%, and the deformation resistance of the shell body is improved by 5% -15%, so that the flatness of the battery can be effectively improved. Meanwhile, the welding power of the battery shell made of the aluminum alloy plate can be reduced by 13.6% -36.4%.
This application aluminum alloy plate can also promote the weight energy density of whole group battery. By taking the CTP product in Ningde times as an example, in the existing battery pack, the weight of the lower box aluminum alloy structural member accounts for about 18%, the weight of the battery cell aluminum alloy structural member accounts for about 7%, and the total weight accounts for 25%. In addition, the rigidity of the lower box body can be improved by applying the aluminum alloy plate to the lower box body of the battery pack.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.
Claims (12)
1. The aluminum alloy plate for the lithium ion battery is characterized in that raw materials of the aluminum alloy plate comprise Li, al, mn, si and Cu, wherein the weight percentage of Li is 0.5-3.0 wt%, and the weight percentage of Al is 96.5-99 wt%.
2. The aluminum alloy sheet according to claim 1, wherein the raw material for the aluminum alloy sheet contains 0.04 to 1.5wt% of Mn, less than 0.6wt% of Si, and 0.05 to 0.2wt% of Cu.
3. The aluminum alloy sheet according to claim 1, wherein the aluminum alloy sheet further comprises Fe in an amount of < 0.7 wt.%.
4. The aluminum alloy sheet material of claim 1, which is composed of the following raw materials in mass percent: li:0.5wt% -2.0 wt%, al:96.5wt% -99.0 wt%, mn:0.04wt% -1.5 wt%, si less than 0.6wt%, fe less than 0.7wt%, cu:0.05wt% to 0.2wt% and unavoidable impurities < 0.2wt%.
5. A battery case, comprising:
a shell body (1);
the shell bottom (2) is connected to the bottom of the shell body (1);
the shell body and the shell bottom are both prepared from the aluminum alloy plate material in any one of claims 1-4.
6. The battery housing as claimed in claim 5, characterized in that the housing body (1) comprises two oppositely disposed first side walls (11) and two oppositely disposed second side walls (12); the thickness of the first side wall (11) is 0.4-0.8 mm; the thickness of the second side wall (12) is 0.6-1.0 mm.
7. The battery case according to claim 5, wherein the thickness of the case bottom (2) is 1.0 to 1.8mm.
8. The battery housing of claim 5, further comprising:
and the top cover (3) is welded to the top of the shell body (1).
9. The battery case according to claim 8, wherein the top cover (3) is made of the aluminum alloy sheet according to any one of claims 1 to 4.
10. The battery case of claim 8, wherein the welding is by laser welding.
11. The battery case according to claim 10, wherein the laser welding power is 700W to 950W.
12. The battery case according to claim 10, wherein the laser welding further satisfies at least one of the following features (1) to (3):
(1) The effective penetration of the laser welding is 350-450 mu m;
(2) The welding speed of the laser welding is 100 mm/s-200 mm/s;
(3) The protective gas flow of the laser welding is 70L/min-80L/min.
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