阅读说明：本技术 一种用于电池壳的镁合金材料 (Magnesium alloy material for battery shell ) 是由 王小莹 于 2021-09-13 设计创作，主要内容包括：本发明涉及电池壳技术领域,提供了一种用于电池壳的镁合金材料,按质量百分比计,该镁合金由以下组分组成：Al 2.5-3.0份；Mn 0.08-1份；RE 0.6-1.5份；Zn 0.6-1.4份；Zr 0.04-0.1份；余量为Mg,还包括电池壳的加工方法,本发明克服了现有技术的不足,设计合理,结构紧凑,解决了现有的铝合金电池密度大,强度低以及部分镁合金电池可塑性差的问题,本发明通过多个配方的组合,通过添加RE、Zr等成分,在降低密度的同时也会提高精细度,还可以提高延展性,方便加工,而且其拉伸、屈服强度适中,导热性能更佳。(The invention relates to the technical field of battery cases, and provides a magnesium alloy material for a battery case, which comprises the following components in percentage by mass: 2.5-3.0 parts of Al; 0.08-1 part of Mn; 0.6-1.5 parts of RE; 0.6-1.4 parts of Zn; 0.04-0.1 part of Zr; the invention overcomes the defects of the prior art, has reasonable design and compact structure, solves the problems of high density, low strength and poor plasticity of partial magnesium alloy batteries of the prior aluminum alloy batteries, improves the fineness while reducing the density by combining a plurality of formulas and adding RE, Zr and other components, can also improve the ductility, is convenient to process, has moderate tensile and yield strength and better heat-conducting property.)

1. The magnesium alloy material for the battery shell comprises the following components in percentage by mass:

2. the magnesium alloy material for battery cases according to claim 1, characterized in that: the RE is rare earth metal and is a general name of 17 elements of scandium, yttrium and lanthanide series in IIIB group of the periodic table of elements.

3. The method for manufacturing a magnesium alloy battery can according to claim 1, comprising the steps of:

step one, taking a pure Mg ingot, a pure Zn ingot, a pure Al ingot, Mn, RE and Zr powder as raw materials, and mixing the raw materials according to the mass percentage of the components of the magnesium alloy;

placing the pure Mg ingot into a crucible of a melting furnace, introducing SF6 and N2 protective gas, and completely melting under the protection of the protective gas, wherein the furnace temperature is set to 800 ℃;

step three, drying pure Zn ingots, pure Al ingots, RE and Zr powder at 300 ℃, and then sequentially and slowly adding the dried pure Zn ingots, pure Al ingots, RE and Zr powder into a crucible for full melting;

step four, after the added materials are completely melted, heating to 750 ℃, and stirring once every 15 minutes to uniformly mix and distribute the materials in the crucible, wherein the total stirring time is 1 hour;

step five, starting a refining step when the mixed melt is stabilized at 710 ℃, adding a refining agent for 3 times, fully stirring and introducing argon gas to ensure that the melt is rolled and fully contacted with the refining agent, wherein the refining time is 0.5-1 h;

sixthly, fishing out the scum after the refining is finished, standing for 2 hours at 430 ℃, fishing out the scum, pouring a spectrum sample for stokehole analysis, and adjusting the components of the mixed melt until the components and the content of the magnesium alloy in the embodiment are reached;

and step seven, pouring the magnesium alloy melt with the standard components into a metal mold, and casting and molding the required casting.

Technical Field

The invention relates to the technical field of battery shell processes, in particular to a magnesium alloy material for a battery shell.

Background

As is well known, new energy vehicles are a development trend in the future, but the new energy vehicles cannot completely replace fuel vehicles at present, and the low energy density and high price of batteries are major bottlenecks at present.

For batteries of Electric Vehicles (EV), aluminum cases are mostly used in the industry to reduce cost and weight. It has light density and relatively low cost.

However, the power battery has a large capacity and a correspondingly large shell, and considering the reasons of strength and the like, the thickness of the shell wall of the aluminum shell is 0.6mm, which is difficult to be optimized in the direction of lightness and thinness. In the power battery (such as 20Ah) with the aluminum shell structure, the weight of the shell accounts for more than 80% of the weight of the machine component.

Therefore, it is necessary to provide a material which has a light density and a high strength and is not easily electrochemically corroded, instead of the conventional aluminum alloy.

At present, the magnesium alloy is adopted to replace the aluminum alloy in the market, the weight of the magnesium alloy is 30 percent lighter than that of the existing aluminum alloy, and the integral performance of the automobile can be greatly improved due to the inherent characteristics of vibration reduction, noise reduction and rapid and uniform heat dissipation of the magnesium alloy.

However, when the magnesium alloy is used as a battery case, the traditional magnesium alloy has poor heat conduction effect, is not beneficial to heat dissipation of the battery, has poor ductility, is inconvenient to process, and has relatively high density.

To this end, we propose a magnesium alloy material for a battery case.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a magnesium alloy material for a battery shell, which overcomes the defects of the prior art, has reasonable design and compact structure, and solves the problems of high density, low strength and poor plasticity of part of the existing aluminum alloy battery.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme:

the magnesium alloy material for the battery shell comprises the following components in percentage by mass:

2.5-3.0 parts of Al;

0.08-1 part of Mn;

0.6-1.5 parts of RE;

0.6-1.4 parts of Zn;

0.04-0.1 part of Zr;

the balance being Mg.

Optionally, RE is a rare earth metal, which is a generic name for 17 elements of scandium, yttrium, and lanthanide series in group iiib of the periodic table of elements.

A method of making a magnesium alloy battery case comprising the steps of:

step one, taking a pure Mg ingot, a pure Zn ingot, a pure Al ingot, Mn, RE and Zr powder as raw materials, and mixing the raw materials according to the mass percentage of the components of the magnesium alloy;

placing the pure Mg ingot into a crucible of a melting furnace, introducing SF6 and N2 protective gas, and completely melting under the protection of the protective gas, wherein the furnace temperature is set to 800 ℃;

step three, drying pure Zn ingots, pure Al ingots, RE and Zr powder at 300 ℃, and then sequentially and slowly adding the dried pure Zn ingots, pure Al ingots, RE and Zr powder into a crucible for full melting;

step four, after the added materials are completely melted, heating to 750 ℃, and stirring once every 15 minutes to uniformly mix and distribute the materials in the crucible, wherein the total stirring time is 1 hour;

step five, starting a refining step when the mixed melt is stabilized at 710 ℃, adding a refining agent for 3 times, fully stirring and introducing argon gas to ensure that the melt is rolled and fully contacted with the refining agent, wherein the refining time is 0.5-1 h;

sixthly, fishing out the scum after the refining is finished, standing for 2 hours at 430 ℃, fishing out the scum, pouring a spectrum sample for stokehole analysis, and adjusting the components of the mixed melt until the components and the content of the magnesium alloy in the embodiment are reached;

and step seven, pouring the magnesium alloy melt with the standard components into a metal mold, and casting and molding the required casting.

(III) advantageous effects

The embodiment of the invention provides a magnesium alloy material for a battery shell. The method has the following beneficial effects: by adopting the formula of the magnesium alloy, the thermal conductivity coefficient of the magnesium alloy is measured to be 90-104W (m.K) -1, the density of the magnesium alloy is only 1.75-1.95 g/cm3, and the density of the aluminum alloy Al3003, which is smaller than that of the aluminum alloy Al3003 of the conventional power battery shell, is 2.7g/cm 3; the tensile strength is 250-290MPa, the yield strength is 150-180MPa, the elongation is 7-12%, the 48h standard neutral salt spray corrosion test grade is 8-11, and the practicability is very strong.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The magnesium alloy material for the battery shell comprises the following components in percentage by mass: 2.5-3.0 parts of Al;

0.08-1 part of Mn; mn can improve the antioxidant effect;

RE 0.6-1.5 weight portions, RE is RE metal and is the general name of 17 elements of scandium, yttrium and lanthanide in IIIB group of periodic table, and adding RE into the battery case can raise the ductility of the battery case and plasticity effect.

0.6-1.4 parts of Zn; the zinc can improve the corrosion resistance and the tensile resistance.

0.04-0.1 part of Zr; zr can increase the fineness of the battery case to improve ductility and strength, but if the Zr content is too high, it affects the workability;

the balance being Mg.

Through the combination, the unique application of the magnesium alloy in the battery shell can be realized, and the effects of heat dissipation, the density, the tensile effect, the yield effect, the ductility and the antioxidant effect of the battery shell are influenced to different degrees.

The magnesium alloy battery shell manufactured by adopting the components comprises the following steps:

step one, taking a pure Mg ingot, a pure Zn ingot, a pure Al ingot, Mn, RE and Zr powder as raw materials, and mixing the raw materials according to the mass percentage of the components of the magnesium alloy.

And step two, placing the pure Mg ingot into a crucible of a melting furnace, introducing SF6+ N2 protective gas, and completely melting under the protection of the protective gas, wherein the furnace temperature is set to 800 ℃.

And step three, drying the pure Zn ingot, the pure Al ingot, the RE powder and the Zr powder at 300 ℃, and then sequentially and slowly adding the dried pure Zn ingot, the pure Al ingot, the RE powder and the Zr powder into a crucible for full melting.

And step four, after the added materials are completely melted, heating to 750 ℃, and stirring once every 15 minutes to uniformly mix and distribute the materials in the crucible, wherein the total stirring time is 1 hour.

And step five, starting the refining step when the mixed melt is stabilized at 710 ℃, adding the refining agent for 3 times, fully stirring and introducing argon gas to ensure that the melt is rolled and fully contacted with the refining agent, wherein the refining time is 0.5-1 h.

And step six, fishing out the scum after the refining is finished, standing for 2 hours at 430 ℃, fishing out the scum, pouring a spectrum sample for stokehole analysis, and adjusting the components of the mixed melt until the components and the content of the magnesium alloy in the embodiment are reached.

And step seven, pouring the magnesium alloy melt with the standard components into a metal mold, and casting and molding the required casting.

Under the condition of 20 ℃, the thermal conductivity coefficient of the magnesium alloy is measured to be 90-104W (m.K) -1, the density of the magnesium alloy is only 1.75-1.95 g/cm3, and the density of the aluminum alloy Al3003, which is smaller than that of the aluminum alloy Al3003 of the traditional power battery shell, is 2.7g/cm 3; the tensile strength is 250-290MPa, the yield strength is 150-180MPa, the elongation is 7-12%, and the 48h standard neutral salt spray corrosion test grade is 8-11.

Example 1

The magnesium alloy material for the battery shell comprises the following components in percentage by mass:

2.7 parts of Al;

0.35 part of Mn;

0.68 part of RE;

0.8 part of Zn;

0.07 part of Zr;

the balance being Mg.

The magnesium alloy battery shell manufactured by adopting the components comprises the following steps:

step one, taking a pure Mg ingot, a pure Zn ingot, a pure Al ingot, Mn, RE and Zr powder as raw materials, and mixing the raw materials according to the mass percentage of the components of the magnesium alloy.

And step two, placing the pure Mg ingot into a crucible of a melting furnace, introducing SF6+ N2 protective gas, and completely melting under the protection of the protective gas, wherein the furnace temperature is set to 800 ℃.

And step three, drying the pure Zn ingot, the pure Al ingot, the RE powder and the Zr powder at 300 ℃, and then sequentially and slowly adding the dried pure Zn ingot, the pure Al ingot, the RE powder and the Zr powder into a crucible for full melting.

And step four, after the added materials are completely melted, heating to 750 ℃, and stirring once every 15 minutes to uniformly mix and distribute the materials in the crucible, wherein the total stirring time is 1 hour.

And step five, starting the refining step when the mixed melt is stabilized at 710 ℃, adding the refining agent for 3 times, fully stirring and introducing argon gas to ensure that the melt is rolled and fully contacted with the refining agent, wherein the refining time is 0.5-1 h.

And step six, fishing out the scum after the refining is finished, standing for 2 hours at 430 ℃, fishing out the scum, pouring a spectrum sample for stokehole analysis, and adjusting the components of the mixed melt until the components and the content of the magnesium alloy in the embodiment are reached.

And step seven, pouring the magnesium alloy melt with the standard components into a metal mold, and casting and molding the required casting.

The thermal conductivity coefficient of the magnesium alloy is measured to be more than 103W (m.K) -1 at the temperature of 20 ℃, the density of the magnesium alloy is only 1.75g/cm3, and the density of the aluminum alloy Al3003 is 2.7g/cm3 which is smaller than that of the aluminum alloy Al3003 of the prior power battery shell. The tensile strength is 270MPa, the yield strength is 160MPa, the elongation is 10%, and the 48h standard neutral salt spray corrosion test grade is 10 grade.

Example 2

The magnesium alloy material for the battery shell comprises the following components in percentage by mass: 2.5 parts of Al;

0.08 part of Mn;

0.6 part of RE;

0.6 part of Zn;

0.04 part of Zr;

the balance being Mg.

The magnesium alloy battery shell manufactured by adopting the components comprises the following steps:

step one, taking a pure Mg ingot, a pure Zn ingot, a pure Al ingot, Mn, RE and Zr powder as raw materials, and mixing the raw materials according to the mass percentage of the components of the magnesium alloy.

And step two, placing the pure Mg ingot into a crucible of a melting furnace, introducing SF6+ N2 protective gas, and completely melting under the protection of the protective gas, wherein the furnace temperature is set to 800 ℃.

And step three, drying the pure Zn ingot, the pure Al ingot, the RE powder and the Zr powder at 300 ℃, and then sequentially and slowly adding the dried pure Zn ingot, the pure Al ingot, the RE powder and the Zr powder into a crucible for full melting.

And step four, after the added materials are completely melted, heating to 750 ℃, and stirring once every 15 minutes to uniformly mix and distribute the materials in the crucible, wherein the total stirring time is 1 hour.

And step five, starting the refining step when the mixed melt is stabilized at 710 ℃, adding the refining agent for 3 times, fully stirring and introducing argon gas to ensure that the melt is rolled and fully contacted with the refining agent, wherein the refining time is 0.5-1 h.

And step six, fishing out the scum after the refining is finished, standing for 2 hours at 430 ℃, fishing out the scum, pouring a spectrum sample for stokehole analysis, and adjusting the components of the mixed melt until the components and the content of the magnesium alloy in the embodiment are reached.

And step seven, pouring the magnesium alloy melt with the standard components into a metal mold, and casting and molding the required casting.

The thermal conductivity coefficient of the magnesium alloy is measured to be more than 100W (m.K) -1 at the temperature of 20 ℃, the density of the magnesium alloy is only 1.75g/cm3, and the density of the aluminum alloy Al3003 is 2.7g/cm3 which is smaller than that of the aluminum alloy Al3003 of the prior power battery shell. The tensile strength is 260MPa, the yield strength is 155MPa, the elongation is 10 percent, and the 48h standard neutral salt spray corrosion test grade is 8 grade.

Example 3

The magnesium alloy material for the battery shell comprises the following components in percentage by mass: 2.5 parts of Al;

0.08 part of Mn;

0.6 part of RE;

0.6 part of Zn;

0.1 part of Zr;

the balance being Mg.

The magnesium alloy battery shell manufactured by adopting the components comprises the following steps:

step one, taking a pure Mg ingot, a pure Zn ingot, a pure Al ingot, Mn, RE and Zr powder as raw materials, and mixing the raw materials according to the mass percentage of the components of the magnesium alloy.

And step two, placing the pure Mg ingot into a crucible of a melting furnace, introducing SF6+ N2 protective gas, and completely melting under the protection of the protective gas, wherein the furnace temperature is set to 800 ℃.

And step three, drying the pure Zn ingot, the pure Al ingot, the RE powder and the Zr powder at 300 ℃, and then sequentially and slowly adding the dried pure Zn ingot, the pure Al ingot, the RE powder and the Zr powder into a crucible for full melting.

And step four, after the added materials are completely melted, heating to 750 ℃, and stirring once every 15 minutes to uniformly mix and distribute the materials in the crucible, wherein the total stirring time is 1 hour.

And step five, starting the refining step when the mixed melt is stabilized at 710 ℃, adding the refining agent for 3 times, fully stirring and introducing argon gas to ensure that the melt is rolled and fully contacted with the refining agent, wherein the refining time is 0.5-1 h.

And step six, fishing out the scum after the refining is finished, standing for 2 hours at 430 ℃, fishing out the scum, pouring a spectrum sample for stokehole analysis, and adjusting the components of the mixed melt until the components and the content of the magnesium alloy in the embodiment are reached.

And step seven, pouring the magnesium alloy melt with the standard components into a metal mold, and casting and molding the required casting.

The thermal conductivity coefficient of the magnesium alloy is measured to be larger than 102W (m.K) -1 at the temperature of 20 ℃, the density of the magnesium alloy is only 1.8g/cm3, and the density of the aluminum alloy Al3003 is 2.7g/cm3 which is smaller than that of the aluminum alloy Al3003 of the prior power battery shell. The tensile strength is 280MPa, the yield strength is 210MPa, the elongation is 8 percent, and the 48h standard neutral salt spray corrosion test grade is 11.

Example 4

The magnesium alloy material for the battery shell comprises the following components in percentage by mass: 3.0 parts of Al;

1 part of Mn;

RE 1.5 parts;

1.4 parts of Zn;

0.1 part of Zr;

the balance being Mg.

The magnesium alloy battery shell manufactured by adopting the components comprises the following steps:

step one, taking a pure Mg ingot, a pure Zn ingot, a pure Al ingot, Mn, RE and Zr powder as raw materials, and mixing the raw materials according to the mass percentage of the components of the magnesium alloy.

And step two, placing the pure Mg ingot into a crucible of a melting furnace, introducing SF6+ N2 protective gas, and completely melting under the protection of the protective gas, wherein the furnace temperature is set to 800 ℃.

And step three, drying the pure Zn ingot, the pure Al ingot, the RE powder and the Zr powder at 300 ℃, and then sequentially and slowly adding the dried pure Zn ingot, the pure Al ingot, the RE powder and the Zr powder into a crucible for full melting.

And step four, after the added materials are completely melted, heating to 750 ℃, and stirring once every 15 minutes to uniformly mix and distribute the materials in the crucible, wherein the total stirring time is 1 hour.

And step five, starting the refining step when the mixed melt is stabilized at 710 ℃, adding the refining agent for 3 times, fully stirring and introducing argon gas to ensure that the melt is rolled and fully contacted with the refining agent, wherein the refining time is 0.5-1 h.

And step six, fishing out the scum after the refining is finished, standing for 2 hours at 430 ℃, fishing out the scum, pouring a spectrum sample for stokehole analysis, and adjusting the components of the mixed melt until the components and the content of the magnesium alloy in the embodiment are reached.

And step seven, pouring the magnesium alloy melt with the standard components into a metal mold, and casting and molding the required casting.

The thermal conductivity coefficient of the magnesium alloy is measured to be more than 92W (m.K) -1 at the temperature of 20 ℃, the density of the magnesium alloy is only 1.95g/cm3, and the density of the aluminum alloy Al3003 is 2.7g/cm3, which is smaller than that of the aluminum alloy Al3003 of the prior power battery shell. The tensile strength is 285MPa, the yield strength is 180MPa, the elongation is 8 percent, and the 48h standard neutral salt spray corrosion test grade is 10 grade.

Example 5

The magnesium alloy material for the battery shell comprises the following components in percentage by mass: 2.7 parts of Al;

0.35 part of Mn;

RE 1.5 parts;

0.8 part of Zn;

0.07 part of Zr;

the balance being Mg.

The magnesium alloy battery shell manufactured by adopting the components comprises the following steps:

step one, taking a pure Mg ingot, a pure Zn ingot, a pure Al ingot, Mn, RE and Zr powder as raw materials, and mixing the raw materials according to the mass percentage of the components of the magnesium alloy.

And step two, placing the pure Mg ingot into a crucible of a melting furnace, introducing SF6+ N2 protective gas, and completely melting under the protection of the protective gas, wherein the furnace temperature is set to 800 ℃.

And step three, drying the pure Zn ingot, the pure Al ingot, the RE powder and the Zr powder at 300 ℃, and then sequentially and slowly adding the dried pure Zn ingot, the pure Al ingot, the RE powder and the Zr powder into a crucible for full melting.

And step four, after the added materials are completely melted, heating to 750 ℃, and stirring once every 15 minutes to uniformly mix and distribute the materials in the crucible, wherein the total stirring time is 1 hour.

And step five, starting the refining step when the mixed melt is stabilized at 710 ℃, adding the refining agent for 3 times, fully stirring and introducing argon gas to ensure that the melt is rolled and fully contacted with the refining agent, wherein the refining time is 0.5-1 h.

And step six, fishing out the scum after the refining is finished, standing for 2 hours at 430 ℃, fishing out the scum, pouring a spectrum sample for stokehole analysis, and adjusting the components of the mixed melt until the components and the content of the magnesium alloy in the embodiment are reached.

And step seven, pouring the magnesium alloy melt with the standard components into a metal mold, and casting and molding the required casting.

The thermal conductivity coefficient of the magnesium alloy is measured to be more than 100W (m.K) -1 at the temperature of 20 ℃, the density of the magnesium alloy is only 1.75g/cm3, and the density of the aluminum alloy Al3003 is 2.7g/cm3 which is smaller than that of the aluminum alloy Al3003 of the prior power battery shell. The tensile strength is 250MPa, the yield strength is 150MPa, the elongation is 12%, and the 48h standard neutral salt spray corrosion test is grade 9.

Example 6

The magnesium alloy material for the battery shell comprises the following components in percentage by mass: 2.7 parts of Al;

0.35 part of Mn;

0.4 part of RE;

0.8 part of Zn;

0.07 part of Zr;

the balance being Mg.

The magnesium alloy battery shell manufactured by adopting the components comprises the following steps:

step one, taking a pure Mg ingot, a pure Zn ingot, a pure Al ingot, Mn, RE and Zr powder as raw materials, and mixing the raw materials according to the mass percentage of the components of the magnesium alloy.

And step two, placing the pure Mg ingot into a crucible of a melting furnace, introducing SF6+ N2 protective gas, and completely melting under the protection of the protective gas, wherein the furnace temperature is set to 800 ℃.

And step three, drying the pure Zn ingot, the pure Al ingot, the RE powder and the Zr powder at 300 ℃, and then sequentially and slowly adding the dried pure Zn ingot, the pure Al ingot, the RE powder and the Zr powder into a crucible for full melting.

And step four, after the added materials are completely melted, heating to 750 ℃, and stirring once every 15 minutes to uniformly mix and distribute the materials in the crucible, wherein the total stirring time is 1 hour.

And step five, starting the refining step when the mixed melt is stabilized at 710 ℃, adding the refining agent for 3 times, fully stirring and introducing argon gas to ensure that the melt is rolled and fully contacted with the refining agent, wherein the refining time is 0.5-1 h.

And step six, fishing out the scum after the refining is finished, standing for 2 hours at 430 ℃, fishing out the scum, pouring a spectrum sample for stokehole analysis, and adjusting the components of the mixed melt until the components and the content of the magnesium alloy in the embodiment are reached.

And step seven, pouring the magnesium alloy melt with the standard components into a metal mold, and casting and molding the required casting.

The thermal conductivity coefficient of the magnesium alloy is measured to be more than 104W (m.K) -1 at the temperature of 20 ℃, the density of the magnesium alloy is only 1.75g/cm3, and the density of the aluminum alloy Al3003 is 2.7g/cm3 which is smaller than that of the aluminum alloy Al3003 of the prior power battery shell. The tensile strength is 290MPa, the yield strength is 180MPa, the elongation is 7 percent, and the 48h standard neutral salt spray corrosion test grade is 9 grade.

The density measurement method comprises the following steps: A10X 1mm sheet was taken and the volume calculated to be 100mm3, i.e. 0.1cm 3. The mass was then weighed electronically and the density was determined by dividing the weight by the volume.

The tensile strength detection method comprises the following steps: taking a 50 (length) x12.5 (width) x1 (thickness) mm sheet, respectively fixing two ends of the sheet in the length direction at two ends of a tension meter, wherein one end of the tension meter is fixed, and the other end of the tension meter can apply force F (unit: N) to the sheet until the sheet is broken. And the cross-sectional area S of the tensile section is 12.5x1 is 12.5mm 2. Tensile strength σ ═ F/S.

The data of the following table, which is obtained by combining examples 1 to 6, are shown in the table

2.7 parts of Al;

0.35 part of Mn;

0.68 part of RE;

0.8 part of Zn;

0.07 part of Zr;

the balance being Mg.

Each index of the battery is optimal, the battery has a good heat dissipation effect when being used as a battery case, and meanwhile, the battery is strong in plasticity, convenient to process and better in corrosion resistance.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will 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 technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.