Magnesium alloy, preparation method thereof, battery and electric device

Abstract

The application discloses a magnesium alloy, which comprises 2-6.5% of Zn in terms of mass percentage, 0.01-3% of rare earth elements in terms of mass percentage, 0.01-1% of Zr in terms of mass percentage, 0.5-2% of CaO in terms of mass percentage, and the rest of Mg and impurities. The application also provides a preparation method of the magnesium alloy, a battery and an electric device. The magnesium alloy has good flame retardant performance.

Description

TECHNICAL FIELD

[0001] The present application relates to a magnesium alloy, a preparation method thereof, a battery and an electric device. BACKGROUND

[0002] The magnesium alloy has the advantages of small density, high strength, large elastic modulus, good heat dissipation, good shock absorption, high recycling rate, etc. The magnesium alloy is mainly used in the industries of aviation, aerospace, transportation, chemical industry, rocket, etc. However, the existing magnesium alloy still has the problem of insufficient flame retardant performance, which limits the further development and application of the magnesium alloy. Therefore, it is of great significance to provide a magnesium alloy with good flame retardant performance. SUMMARY

[0003] In view of the above problems, the present application provides a magnesium alloy, a preparation method thereof, a battery and an electric device to solve the above technical problems existing in the magnesium alloy.

[0004] In a first aspect, the present application provides a magnesium alloy, comprising:

[0005] Zinc (Zn), the mass percentage of Zn being 2%-6.5%;

[0006] a rare earth element, the mass percentage of the rare earth element being 0.01%-3%;

[0007] zirconium (Zr), the mass percentage of Zr being 0.01%-1%;

[0008] calcium oxide (CaO), the mass percentage of CaO being 0.5%-2%; and

[0009] the rest being Mg and impurities.

[0010] In the technical scheme of the present application, Zn, the rare earth element, Zr, CaO and Mg are matched and the percentages of the above components are controlled. CaO can significantly improve the ignition point of the magnesium alloy. By controlling the mass percentage of CaO to be 0.5%-2%, the hot cracking phenomenon of the magnesium alloy during casting and the sticking phenomenon of the magnesium alloy during extrusion are alleviated, and the flame retardant performance of the magnesium alloy is significantly improved without affecting the casting performance and extrusion performance of the magnesium alloy.

[0011] In some embodiments, the rare earth element includes at least one of lanthanum (La) and cerium (Ce).

[0012] In the technical scheme of the present application, La and Ce are both low-priced rare earth metals. Therefore, on the basis of controlling the mechanical properties of the alloy, the cost of the magnesium alloy is also low, which is conducive to industrialized production.

[0013] In some embodiments, the mass percentage of Zn is 5%-6.5%; the mass percentage of rare earth elements is 2%-3%; the mass percentage of Zr is 0.5%-1%; the mass percentage of CaO is 1%-2%; and the rest is Mg and impurities.

[0014] In the technical solution of the embodiments of the present application, by controlling the mass percentages of the components, the flame retardant performance of the magnesium alloy is improved without significantly increasing the cost, and the magnesium alloy is not easy to oxidize during the smelting process, so that the use of protective atmosphere and covering agent can be reduced, and the quality of the magnesium liquid is improved.

[0015] In some embodiments, the average grain size of the magnesium alloy is 6-10 μm.

[0016] In the technical solution of the embodiments of the present application, the grains of the magnesium alloy are fully refined, and the microstructure is fine and uniform.

[0017] In some embodiments, the mass percentage of impurities is less than or equal to 0.075%.

[0018] In some embodiments, the impurities include at least one of Fe, Cu, Ni, and Si, wherein the mass percentage of Fe in the magnesium alloy is less than or equal to 0.004%, the mass percentage of Cu in the magnesium alloy is less than or equal to 0.02%, the mass percentage of Ni in the magnesium alloy is less than or equal to 0.001%, and the mass percentage of Si in the magnesium alloy is less than or equal to 0.05%.

[0019] In the technical solution of the embodiments of the present application, the content of impurity elements in the magnesium alloy is low, and the influence of impurities on the performance of the magnesium alloy is reduced.

[0020] In some embodiments, the ignition point of the magnesium alloy is greater than or equal to 750°C, and optionally, the ignition point is greater than or equal to 800°C.

[0021] In the technical solution of the embodiments of the present application, the ignition point of the magnesium alloy is above 750°C, which is beneficial to the safe use of the magnesium alloy in new energy vehicles and other electric devices.

[0022] In a second aspect, the present application provides a preparation method of the magnesium alloy of any of the above embodiments, comprising:

[0023] Pure Mg, pure Zn, Mg-rare earth element intermediate alloy, CaO, and Mg-Zr intermediate alloy are provided according to the mass percentages of Mg, Zn, rare earth elements, Zr, and CaO in the magnesium alloy;

[0024] The pure Mg, pure Zn, CaO, Mg-rare earth element intermediate alloy, and Mg-Zr intermediate alloy are mixed and smelted to obtain a magnesium alloy liquid, and the smelting is performed in a protective gas.

[0025] The magnesium alloy liquid is sequentially subjected to pouring, extrusion and heat treatment.

[0026] In the technical scheme of the embodiment of the application, Zn, rare earth elements, Zr, CaO and Mg are matched and the percentage of the above components is controlled. CaO can significantly improve the ignition point of the magnesium alloy. By controlling the mass percentage of CaO to be 0.5%-2%, the thermal cracking phenomenon of the magnesium alloy in the casting process and the sticking phenomenon of the magnesium alloy in the extrusion process are alleviated, and the ignition point of the magnesium alloy is significantly improved without affecting the casting performance and the extrusion performance of the magnesium alloy.

[0027] In some embodiments, the step of mixing and smelting pure Mg, pure Zn, CaO, Mg-rare earth element intermediate alloy and Mg-Zr intermediate alloy to obtain the magnesium alloy liquid comprises: adding pure Mg into a smelting furnace for melting, adding pure Zn after the pure Mg is melted, and performing mechanical stirring treatment while maintaining the temperature of the smelting furnace; controlling the temperature of the smelting furnace to be 650-680℃, adding CaO after 10-20 min and stirring; increasing the temperature, adding Mg-rare earth element intermediate alloy and stirring when the temperature of the smelting furnace reaches 680-690℃, and finally adding Mg-Zr intermediate alloy and stirring to obtain the magnesium alloy liquid.

[0028] In the technical scheme of the embodiment of the application, the temperature of the smelting furnace is controlled to be 650-680℃, which can reduce the oxidation of the magnesium melt and make CaO uniformly distributed in the melt.

[0029] In the technical scheme of the embodiment of the application, the Mg-rare earth element intermediate alloy is added at 680-690℃, so that the alloy element has a small burning loss, a high recovery rate, a fast dissolution rate and can be completely dissolved.

[0030] In some embodiments, the step of adding Mg-rare earth element intermediate alloy and stirring at 680-690℃ is followed by: maintaining the temperature of the smelting furnace at 680-690℃ for 10-15 min to obtain the magnesium alloy liquid.

[0031] In the technical scheme of the embodiment of the application, the temperature of the smelting furnace is reduced to a temperature suitable for subsequent pouring operation by standing for 10-15 min.

[0032] In a third aspect, the application provides a battery, which comprises the magnesium alloy as described above or the magnesium alloy prepared by the preparation method of the magnesium alloy as described above.

[0033] In the technical scheme of the embodiment of the application, the battery comprises the magnesium alloy, the ignition point of the magnesium alloy is above 750℃, and the magnesium alloy has high mechanical properties, so that the battery can be safely used in vehicles such as new energy vehicles or other electric devices.

[0034] In some embodiments, the battery comprises a battery module, the battery module comprises an end plate, the end plate is located at an end of the battery module, and the magnesium alloy is used for the end plate.

[0035] The magnesium alloy provided by the application is used as the end plate of the battery, and has high ignition point and good mechanical properties, so that the stability of the battery can be improved.

[0036] In a fourth aspect, the application provides a power consumption device comprising the battery of any of the above embodiments.

[0037] The above description is only a summary of the technical solutions of the application, in order to enable the technical solutions of the application to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the application to be more apparent and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0038] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are intended to only illustrate preferred embodiments and are not intended to limit the application. Moreover, the same reference numbers in all the drawings represent the same elements. In the drawings:

[0039] Figure 1 Structure diagram of a power consumption device according to some embodiments of the application;

[0040] Figure 2 Exploded structure diagram of a battery according to some embodiments of the application;

[0041] Figure 3 Exploded structure diagram of a battery module according to some embodiments of the application;

[0042] Figure 4 Exploded structure diagram of a battery cell according to some embodiments of the application;

[0043] Figure 5 Flow chart of a preparation method of a magnesium alloy according to some embodiments of the application. DETAILED DESCRIPTION

[0044] The embodiments of the technical solutions of the application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the application, and therefore only serve as examples, and cannot limit the protection scope of the application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," "having" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items.

[0046] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another.

[0047] Reference herein to "mass percentage" means the percentage of the mass of an element to the total mass of the magnesium alloy.

[0048] The existing magnesium alloy has the problem of insufficient flame retardant performance, which limits the further development and application of the magnesium alloy.

[0049] In order to solve the problem of insufficient flame retardant performance of the existing magnesium alloy, the application designs a magnesium alloy, which comprises: zinc (Zn), the mass percentage of the Zn being 2%-6.5%; rare earth elements, the mass percentage of the rare earth elements being 0.01%-3%; zirconium (Zr), the mass percentage of the Zr being 0.01%-1%; calcium oxide (CaO), the mass percentage of the CaO being 0.5%-2%; and the rest being Mg and impurities.

[0050] The CaO can significantly improve the ignition point of the magnesium alloy, and by controlling the mass percentage of the CaO to be 0.5%-2%, the thermal cracking phenomenon of the magnesium alloy in the casting process and the sticking phenomenon of the magnesium alloy in the extrusion process are alleviated, so that the flame retardant performance of the magnesium alloy is significantly improved without affecting the casting performance and the extrusion performance of the magnesium alloy.

[0051] The magnesium alloy disclosed by the embodiments of the application can be used in, but is not limited to, the fields of automobiles, electronics, aerospace, etc. For example, the magnesium alloy can be used as the shell material of the battery pack of a new energy vehicle, other shell materials and support materials in automobiles, computers, mobile phones, cameras, airplanes, etc. Any product using the magnesium alloy can use the magnesium alloy provided by the embodiments of the application.

[0052] The following embodiments take a power utilization device 1000 as an example for the purpose of convenient description.

[0053] Please refer to Figure 1, Figure 1 A structural schematic diagram of the power utilization device 1000 is provided for some embodiments of the present application. The power utilization device 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. The power utilization device 1000 is internally provided with a battery 100, which can be arranged at the bottom, the head, or the tail of the power utilization device 1000. The battery 100 can be used for power supply of the power utilization device 1000, for example, the battery 100 can be used as an operating power supply of the power utilization device 1000. The power utilization device 1000 can further include a controller 200 and a motor 300, the controller 200 being used to control the battery 100 to supply power to the motor 300, for example, for working power demand of the power utilization device 1000 in starting, navigation, and driving.

[0054] In some embodiments of the present application, the battery 100 can not only be used as an operating power supply of the power utilization device 1000, but also be used as a driving power supply of the power utilization device 1000, to replace or partially replace fuel or natural gas to provide driving power for the power utilization device 1000.

[0055] Please refer to Figure 2 , Figure 2 A disassembled structural schematic diagram of the battery 100 is provided for some embodiments of the present application. The battery 100 includes a box body 10 and a battery module 20, the battery module 20 being accommodated in the box body 10. The box body 10 is used to provide an accommodation space for the battery module 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first part 11 and a second part 12, the first part 11 and the second part 12 being mutually covered, and the first part 11 and the second part 12 jointly defining an accommodation space for accommodating the battery module 20. The second part 12 can be a hollow structure with one end being open, and the first part 11 can be a plate-shaped structure, the first part 11 being covered on the open side of the second part 12 to jointly define the accommodation space with the second part 12; the first part 11 and the second part 12 can also be hollow structures with one side being open, the open side of the first part 11 being covered on the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can be various shapes, such as a cylinder, a cuboid, etc.

[0056] In the battery 100, the battery module 20 can be one or multiple, and each battery module 20 can be fixed to the case 10 by corresponding fasteners (e.g., bolts), or each battery module 20 can be fixed to the case 10 by adhesion.

[0057] In the battery 100, the battery module 20 can be one or multiple, and each battery module 20 can be fixed to the case 10 by corresponding fasteners (e.g., bolts), or each battery module 20 can be fixed to the case 10 by adhesion.

[0058] Figure 3 The exploded structural diagram of the battery module 20 is provided for some embodiments of the present application. The battery module 20 includes multiple stacked battery cells 20a, end plates 30, and connecting pieces (not shown in the figure). Two end plates 30 are arranged at both ends of the battery module 20 along the stacking direction of the battery cells 20a, and the two end plates 30 are connected by the connecting pieces. The end plates 30 and the connecting pieces provide clamping force to the battery cells 20a, fasten the battery cells 20a, and form a battery module 20 with certain structural strength. The multiple battery cells 20a in the battery module 20 can be electrically connected by busbars (not shown in the figure) to realize parallel connection, series connection, or mixed connection of the multiple battery cells 20a in the battery module 20. The busbars can be one or multiple, and each busbar is used to electrically connect at least two battery cells 20a.

[0059] Each battery cell 20a can be a secondary battery, which can be a lithium-sulfur battery, a lithium-ion battery, or a lithium-metal battery, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0060] Please refer to Figure 4 , Figure 4 The exploded structural diagram of the battery cell 20a is provided for some embodiments of the present application. The battery cell 20a refers to the smallest unit that constitutes a battery. For example, Figure 4 , the battery cell 20a includes an end cover 21, a shell 22, a cell assembly 23, and other functional components.

[0061] The end cover 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery monomer 20a from the external environment. Without limitation, the shape of the end cover 21 can be adapted to the shape of the shell 22 to fit the shell 22. The end cover 21 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 21 is not easily deformed when subjected to extrusion collision, so that the battery monomer 20a can have higher structural strength, and the safety performance can also be improved. The end cover 21 can be provided with functional components such as electrode terminals 21a. The electrode terminals 21a can be used to electrically connect with the cell assembly 23 for output or input of the electrical energy of the battery monomer 20a. In some embodiments, the end cover 21 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery monomer 20a when the internal pressure or temperature of the battery monomer 20a reaches a threshold value. The material of the end cover 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations. In some embodiments, an insulating member can also be provided on the inner side of the end cover 21, which can be used to isolate the electrical connection components in the shell 22 from the end cover 21 to reduce the risk of short circuit. For example, the insulating member can be plastic, rubber, etc.

[0062] The shell 22 is a component for fitting the end cover 21 to form the internal environment of the battery monomer 20a, wherein the formed internal environment can be used to accommodate the cell assembly 23, electrolyte and other components. The shell 22 and the end cover 21 can be independent components, and an opening can be provided on the shell 22, and the end cover 21 is covered on the opening to form the internal environment of the battery monomer 20a. Without limitation, the end cover 21 and the shell 22 can also be integrated, specifically, the end cover 21 and the shell 22 can form a common connecting surface before other components enter the shell, and when it is necessary to encapsulate the internal environment of the shell 22, the end cover 21 is covered on the shell 22. The shell 22 can be various shapes and various sizes, such as rectangular, cylindrical, hexagonal, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the cell assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations.

[0063] The cell assembly 23 is a component in which an electrochemical reaction occurs in the battery cell 100. One or more cell assemblies 23 can be contained within the casing 22. The cell assembly 23 is mainly formed by winding or layering a cathode sheet and an anode sheet, and a separator is generally provided between the cathode sheet and the anode sheet. The cathode sheet and the anode sheet have portions of active material that constitute a main body of the cell assembly, and portions of the cathode sheet and the anode sheet that do not have active material each constitute a tab 23a. The cathode tab and the anode tab can be located together at one end of the main body or at opposite ends of the main body. During charging and discharging of the battery, the cathode active material and the anode active material react with an electrolyte, and the tabs 23a connect to electrode terminals to form a current loop.

[0064] According to some embodiments of the present application, the present application provides a magnesium alloy, comprising: zinc (Zn), the mass percentage of Zn being 2%-6.5%; a rare earth element, the mass percentage of the rare earth element being 0.01%-3%; zirconium (Zr), the mass percentage of Zr being 0.01%-1%; calcium oxide (CaO), the mass percentage of CaO being 0.5%-2%; and the rest being Mg and impurities.

[0065] For example, the mass percentage of Zn can be 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, etc., or 2%-2.5%, 2.5%-3%, 3%-3.5%, 3.5%-4%, 4%-4.5%, 4.5%-5%, 5%-5.5%, 5.5%-6%, 6%-6.5%, etc. It can be understood that the mass percentage of Zn is not limited to the mass percentages listed in the above examples, and can be adjusted according to actual needs, as long as the mass percentage of Zn is 2%-6.5%.

[0066] Zinc has solid solution strengthening and aging strengthening effects in the magnesium alloy, thereby improving the strength of the magnesium alloy; zinc can also weaken the adverse effects of impurities such as iron and nickel in the magnesium alloy on the corrosion resistance of the magnesium alloy, thereby improving the corrosion resistance of the magnesium alloy. If the content of Zn is too high, for example, greater than 6.5% by mass, the mechanical properties of the magnesium alloy will decrease, and the magnesium alloy will also have a tendency to have micro porosity and increased hot cracking; if the content of Zn is too low, for example, less than 2% by mass, the strength and corrosion resistance of the magnesium alloy will not be significantly improved. According to the embodiments of the present application, the mass percentage of Zn is controlled to be 2%-6.5%, so that the strength and corrosion resistance of the magnesium alloy are improved without affecting the mechanical properties of the magnesium alloy.

[0067] For example, the mass percentage of Zr can be 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 1%, etc., or can be 0.01%-0.02%, 0.02%-0.03%, 0.03%-0.04%, 0.04%-0.05%, 0.05%-0.06%, 0.06%-0.07%, 0.06%-0.08%, 0.08%-0.09%, 0.09%-1%, etc. It can be understood that the mass percentage of Zr is not limited to the mass percentages listed in the above examples, and can be adjusted as needed, as long as the mass percentage of Zr is 0.01%-1%.

[0068] Zr has a significant grain refinement effect. If the mass percentage of Zr is too large, for example, higher than 1%, it will cause the magnesium alloy to be difficult to process and cast; if the mass percentage of Zr is too small, the effect of grain refinement is not obvious. The embodiments of the present application control the mass percentage of Zr to be 0.01%-1%, without affecting the processing and casting of the magnesium alloy, and have a significant grain refinement effect.

[0069] For example, the mass percentage of CaO can be 0.5%, 0.65%, 0.7%, 0.85%, 0.9%, 1.0%, 1.15%, 1.2%, 1.35%, 1.4%, 1.55%, 1.6%, 1.75%, 1.8%, 1.95%, 2%, etc., or can be 0.5%-0.65%, 0.65%-0.7%, 0.7%-0.85%, 0.85%-0.9%, 0.9%-1.0%, 1.0%-1.15%, 1.15%-1.2%, 1.2%-1.35%, 1.35%-1.4%, 1.4%-1.55%, 1.55%-1.6%, 1.6%-1.75%, 1.75%-1.8%, 1.8%-1.95%, 1.95%-2%, etc. It can be understood that the mass percentage of CaO is not limited to the mass percentages listed in the above examples, and can be adjusted as needed, as long as the mass percentage of CaO is 0.5%-2%.

[0070] CaO can obviously improve the ignition point of the magnesium alloy, and CaO can refine the microstructure of the magnesium alloy, and the grain size of the obtained magnesium alloy is smaller. When the mass percentage of CaO is too small, for example, less than 0.5%, the effect of improving the ignition point of the magnesium alloy is small, which cannot meet the use requirements of new energy automobile batteries and the like; when the mass percentage of CaO is too large, for example, greater than 2%, the casting performance of the magnesium alloy is reduced, and hot cracking is prone to occur during casting, and the extrusion performance is also reduced, and the phenomenon of sticking to the mold is prone to occur during extrusion. In the technical scheme of the embodiment of the present application, by controlling the mass percentage of CaO to be 0.5%-2%, the flame retardant performance of the magnesium alloy is obviously improved, and the microstructure of the magnesium alloy is refined, and the magnesium alloy with smaller grain size is obtained, without affecting the casting performance and extrusion performance of the magnesium alloy.

[0071] As an example, the mass percentage of the rare earth element can be 0.01%, 0.05%, 0.08%, 0.1%, 0.15%, 0.17%, 0.2%, 0.25%, 0.26%, 3%, etc., and can also be 0.01%-0.05%, 0.05%-0.08%, 0.08%-0.1%, 0.1%-0.15%, 0.15%-0.17%, 0.17%-0.2%, 0.2%-0.25%, 0.25%-0.26%, 0.26%-3%, etc. It can be understood that the mass percentage of the rare earth element is not limited to the mass percentages listed in the above examples, and can be adjusted according to actual needs, as long as the mass percentage of the rare earth element is 0.01%-3%.

[0072] The addition of the rare earth element to the magnesium alloy can refine the magnesium alloy structure and improve the mechanical properties of the magnesium alloy; after the addition of the rare earth element, the melt can be purified during the preparation of the magnesium alloy to play a role in removing gas and slag, and the quality of the melt is improved. During the smelting process, the rare earth element is prone to react with N, H, O and other elements to form rare earth compounds, thereby reducing the gas content in the melt and improving the corrosion resistance of the magnesium alloy. At the same time, the rare earth element can react with Fe, Cu, Ni, Si and other main impurity elements in the magnesium alloy to form high-melting-point binary or multi-component rare earth compounds, thereby reducing the content of impurity elements in the matrix and further improving the mechanical properties and corrosion resistance of the magnesium alloy.

[0073] When the mass percentage of the rare earth element is too small, for example, less than 0.01%, the effect of refining the grain is not achieved, and the improvement of the mechanical properties of the magnesium alloy is small; when the mass percentage of the rare earth element is too large, for example, greater than 3%, the cost of the magnesium alloy is greatly increased, which is not conducive to industrial production. By controlling the mass percentage of the rare earth element to be 0.01%-3%, the mechanical properties of the magnesium alloy are obviously improved while the cost of the magnesium alloy is controlled.

[0074] The rare earth element can be selected according to actual needs. For example, the rare earth element can be at least one of, but is not limited to, lanthanum (La) and cerium (Ce). In other embodiments, the rare earth element can also include praseodymium (Pr), gadolinium (Gd), neodymium (Nd), yttrium (Y), etc. In some embodiments, the rare earth element is a cheap rare earth element, which refers to a rare earth element with a relatively low price known to those skilled in the art, such as La, Ce, Pr, Y, etc.

[0075] In some optional embodiments, the rare earth element includes at least one of La and Ce.

[0076] Both La and Ce are cheap rare earth metals, so that the mechanical properties of the alloy are improved, and the cost of the magnesium alloy is relatively low, which is beneficial to industrial production.

[0077] In some other optional embodiments, the rare earth element only includes Ce.

[0078] On the basis of the composition of the existing Mg-Zn-Zr magnesium alloy, CaO and Ce are added, the magnesium alloy is simple to prepare and has a relatively low cost, and the obtained magnesium alloy has good flame retardant performance and mechanical properties.

[0079] The magnesium alloy in the embodiments of the present application is reasonably matched by Mg, Zn, Zr, a rare earth element, and CaO, and the mass percentage range is controlled, so that the ignition point of the magnesium alloy is above 750 DEG C, and the magnesium alloy has relatively high mechanical properties, and can be safely used in vehicles such as new energy vehicles and other electric devices.

[0080] According to some optional embodiments of the present application, the mass percentage of Zn is 5%-6.5%; the mass percentage of the rare earth element is 2%-3%; the mass percentage of Zr is 0.5%-1%; the mass percentage of CaO is 1%-2%; and the rest is Mg and impurities.

[0081] In the technical solution of the embodiments of the present application, by controlling the mass percentage of each component, the flame retardant performance of the magnesium alloy is improved without significantly increasing the cost, and the magnesium alloy is not easy to oxidize during the melting process, so that the use of protective atmosphere and covering agent can be reduced, and the quality of the magnesium liquid can be improved.

[0082] According to some optional embodiments of the present application, the average grain size of the magnesium alloy is 6-10 μm.

[0083] As an example, the average grain size of the magnesium alloy can be 6 pm, 6.2 pm, 6.43 pm, 6.5 pm, 6.9 pm, 7 pm, 7.26 pm, 7.5 pm, 7.85 pm, 8 pm, 8.3 pm, 8.4 pm, 8.5 pm, 8.85 pm, 9 pm, 9.2 pm, 9.1 pm, 9.2 pm, 9.5 pm, 9.7 pm, 9.9 pm, 10 pm, etc., and can also be 6-8.4 pm, 6.43-7 pm, 7.26-9.9 pm, 7.5-8 pm, 8.3-9 pm, 7.85-9.5 pm, 6.5-10 pm, etc. It can be understood that the average grain size of the magnesium alloy is not limited to the values and value ranges listed in the above examples, and can be adjusted according to actual needs, as long as the mass percentage of CaO is 6-10 pm.

[0084] The grains of the magnesium alloy are fully refined, the grain size of the magnesium alloy is small, and the mechanical properties of the magnesium alloy can be controlled by controlling the grain size, so the grain size can be controlled according to actual needs, and the practicability of the magnesium alloy is improved.

[0085] According to some embodiments of the present application, the mass percentage of impurities is less than or equal to 0.075%.

[0086] As an example, the mass percentage of impurities can be less than or equal to 0.075%, 0.07%, 0.065%, 0.06%, 0.05%, 0.0326%, 0.03%, 0.02%, 0.01%, 0.005%, 0.001%, etc. It can be understood that the mass percentage of impurities is not limited to the value ranges listed in the above examples, and can be adjusted according to actual needs, as long as the mass percentage of impurities is less than or equal to 0.075%.

[0087] According to other embodiments of the present application, the impurities include at least one of Fe, Cu, Ni, and Si, wherein the mass percentage of Fe in the magnesium alloy is less than or equal to 0.004%, the mass percentage of Cu in the magnesium alloy is less than or equal to 0.02%, the mass percentage of Ni in the magnesium alloy is less than or equal to 0.001%, and the mass percentage of Si in the magnesium alloy is less than or equal to 0.05%.

[0088] As an example, the mass percentage of Fe in the magnesium alloy can be less than or equal to 0.004%, 0.003%, 0.0025%, 0.002%, 0.001%, 0.0001%, etc.

[0089] As an example, the mass percentage of Cu in the magnesium alloy can be less than or equal to 0.02%, 0.018%, 0.015%, 0.01%, 0.001%, 0.0001%, etc.

[0090] As an example, the mass percentage of Ni in the magnesium alloy can be less than or equal to 0.001%, 0.0008%, 0.0005%, 0.0002%, 0.0001%, 0.00001%, etc.

[0091] As an example, the mass percentage of Si in the magnesium alloy can be less than or equal to 0.05%, 0.04%, 0.03%, 0.025%, 0.02%, 0.01%, 0.001%, 0.0001%, etc.

[0092] The rare earth elements added in the magnesium alloy, especially La, Ce and other rare earth elements, can react with the main impurity elements such as Fe, Cu, Ni and Si in the magnesium alloy to generate high-melting-point binary or multi-component rare earth compounds, thereby reducing the content of impurity elements in the magnesium alloy. Therefore, the content of impurity elements in the magnesium alloy is low, and the performance of the magnesium alloy is less affected.

[0093] According to some embodiments of the present application, the ignition point of the magnesium alloy is greater than or equal to 750°C, and optionally, the ignition point is greater than or equal to 800°C.

[0094] As an example, the ignition point of the magnesium alloy can be greater than or equal to 750°C, 770°C, 780°C, 800°C, 850°C, etc.

[0095] The ignition point of the magnesium alloy is above 750°C, so that the magnesium alloy provided by the present application can be safely used in new energy vehicles and other electric devices.

[0096] Please refer to Figure 5 According to some embodiments of the present application, the present application also provides a preparation method of the magnesium alloy in any of the above embodiments, comprising:

[0097] Providing pure Mg, pure Zn, Mg-rare earth element intermediate alloy, CaO and Mg-Zr intermediate alloy according to the mass percentage of Mg, Zn, rare earth element, Zr and CaO in the magnesium alloy;

[0098] Mixing the pure Mg, pure Zn, CaO, Mg-rare earth element intermediate alloy and Mg-Zr intermediate alloy and performing smelting to obtain a magnesium alloy liquid, and the smelting is performed in a protective gas;

[0099] The magnesium alloy liquid is sequentially subjected to pouring, extrusion and heat treatment.

[0100] The Zn, rare earth element, Zr, CaO and Mg are matched, and the percentage of the above components is controlled. The CaO can obviously improve the ignition point of the magnesium alloy. By controlling the mass percentage of the CaO to be 0.5%-2%, the hot cracking phenomenon of the magnesium alloy in the casting process and the sticking phenomenon of the magnesium alloy in the extrusion are relieved, and the flame retardant performance of the magnesium alloy is obviously improved without affecting the casting performance and the extrusion performance of the magnesium alloy.

[0101] The preparation method of the magnesium alloy provided by the embodiments of the present application is simple and low in cost. By adding the CaO and controlling the mass percentage of the CaO to be 0.5%-2%, the ignition point of the magnesium alloy is obviously improved, and the flame retardant performance is improved. The CaO can also refine the microstructure of the magnesium alloy, the magnesium alloy obtained has a small grain size, and has good mechanical properties.

[0102] The rare earth element added to the magnesium alloy can refine the microstructure of the magnesium alloy and improve the mechanical properties of the magnesium alloy. After the rare earth element is added, the melt can be purified to play a role of degassing and deslagging in the process of preparing the magnesium alloy, and the quality of the melt is improved. In the smelting process, the rare earth element is easy to react with N, H, O and other elements to form rare earth compounds, thereby reducing the gas content in the melt and improving the corrosion resistance of the magnesium alloy. Meanwhile, the rare earth element can react with Fe, Cu, Ni, Si and other main impurity elements in the magnesium alloy to form high-melting-point binary or multi-component rare earth compounds, thereby reducing the content of the impurity elements in the matrix and further improving the mechanical properties and corrosion resistance of the magnesium alloy.

[0103] According to some embodiments of the present application, the step of mixing and smelting the pure Mg, the pure Zn, the CaO, the Mg-rare earth element intermediate alloy and the Mg-Zr intermediate alloy to obtain the magnesium alloy liquid includes: adding the pure Mg into a smelting furnace for melting, adding the pure Zn after the pure Mg is melted, and performing mechanical stirring treatment while maintaining the temperature of the smelting furnace; controlling the temperature of the smelting furnace to be 650-680℃, adding the CaO after 10-20 min and stirring; increasing the temperature, adding the Mg-rare earth element intermediate alloy and stirring when the temperature of the smelting furnace reaches 680-690℃, and finally adding the Mg-Zr intermediate alloy and stirring to obtain the magnesium alloy liquid.

[0104] The type of the smelting furnace can be selected according to actual needs. In some optional embodiments, the smelting furnace is a protective gas smelting furnace, and protective gas can be introduced into the smelting furnace.

[0105] The melting point of the pure Mg is 649℃. In some optional embodiments, the pure Mg is added into the smelting furnace, and the temperature is increased to 650-680℃ so that the pure Mg is completely melted.

[0106] In some optional embodiments, the stirring manner includes, but is not limited to, natural convection stirring, manual stirring, steel flow impact stirring, mechanical stirring, electromagnetic stirring, gas stirring, etc., which can be selected according to actual needs.

[0107] For example, when CaO is added to the smelting furnace, the temperature in the smelting furnace can be, but is not limited to, 650℃, 655℃, 660℃, 665℃, 670℃, 675℃, 680℃, etc., or can be, but is not limited to, 650-655℃, 655-660℃, 660-665℃, 665-670℃, 670-675℃, 675-680℃, etc.

[0108] If the addition temperature of CaO is too high, for example, higher than 680℃, the magnesium melt is easy to be oxidized; if the addition temperature of CaO is too low, for example, lower than 650℃, the flowability of the magnesium melt is low, which can cause uneven distribution of CaO. In the technical scheme of the embodiments of the present application, the temperature of the smelting furnace is controlled to be 650-680℃, which can reduce the oxidation of the magnesium melt and make CaO uniformly distributed in the melt.

[0109] For example, when the Mg-rare earth element intermediate alloy is added to the smelting furnace, the temperature in the smelting furnace can be, but is not limited to, 680℃, 681℃, 682℃, 683℃, 684℃, 685℃, 686℃, 687℃, 688℃, 689℃, 690℃, etc., or can be, but is not limited to, 680-681℃, 681-682℃, 682-683℃, 683-684℃, 684-685℃, 685-686℃, 686-687℃, 687-688℃, 688-689℃, 689-690℃, etc.

[0110] If the addition temperature of the Mg-rare earth element intermediate alloy is too high, for example, higher than 690℃, the loss of alloying elements will increase and the yield of alloying elements will decrease; if the addition temperature of the Mg-rare earth element intermediate alloy is too low, for example, lower than 680℃, the dissolution rate of alloying elements will be slow and even the alloying elements cannot be completely dissolved.

[0111] In the embodiments of the present application, the Mg-rare earth element intermediate alloy is added at 680-690℃, so that the loss of alloying elements is small, the yield of alloying elements is high, and the dissolution rate of alloying elements is fast and the alloying elements can be completely dissolved.

[0112] According to some embodiments of the present application, after the step of adding the Mg-rare earth element intermediate alloy at 680-690℃ and stirring, the method further includes: maintaining the temperature of the smelting furnace at 680-690℃ for 10-15 min to obtain a magnesium alloy liquid.

[0113] For example, the standing time can be, but is not limited to, 10 min, 11 min, 12 min, 13 min, 14 min, 15 min, etc., and can also be, but is not limited to, 10-11 min, 11-12 min, 12-13 min, 13-14 min, 14-15 min, etc. Standing for 10-15 min makes the temperature of the smelting furnace decrease to a temperature suitable for subsequent pouring operation.

[0114] According to some optional embodiments of the present application, the protective gas can include, but is not limited to, a mixed gas of sulfur hexafluoride (SF6) and nitrogen (N2), argon and SF6, a mixed gas of SF6 and carbon dioxide (CO2), etc. The volume ratio of SF6 and N2 in the mixed gas of SF6 and N2, and the volume ratio of SF6 and CO2 in the mixed gas of SF6 and CO2 can be selected according to actual needs.

[0115] According to some optional embodiments of the present application, the protective gas is a mixed gas of sulfur hexafluoride (SF6) and nitrogen (N2).

[0116] By introducing the protective gas, the time of the magnesium alloy liquid in contact with the atmosphere during smelting can be reduced, and the magnesium alloy liquid can be prevented from being oxidized.

[0117] The material of the pouring mold in pouring can be selected according to the material of the casting. According to some embodiments of the present application, the pouring mold used in pouring can be, but is not limited to, a metal mold, a metal alloy mold, a ceramic mold, a synthetic material mold, etc. For example, aluminum, H13 steel, ferrosilicon alloy, graphite, alumina ceramic, potassium borate glass fiber, etc. According to some optional embodiments of the present application, the pouring mold used in pouring is a metal film. The size of the pouring mold can be selected according to the shape, size, etc. of the casting.

[0118] The metal mold, the metal alloy mold, the ceramic mold, or the synthetic material mold has low price, and has good high-temperature resistance, toughness, strength, etc.

[0119] In some optional embodiments, after pouring, the ingot obtained by pouring is subjected to homogenization treatment at 390-410 ℃ for 10-14 h.

[0120] According to some embodiments of the present application, the extrusion billet is obtained by removing the head and tail of the ingot obtained by pouring and peeling off the skin. The extrusion billet is put into an extrusion cylinder, and an extrusion rod is obtained by extrusion.

[0121] The extrusion billet obtained by removing the head and tail of the ingot obtained by pouring and peeling off the skin has good quality, and is more conducive to extrusion molding.

[0122] According to some embodiments of the present application, the extrusion parameters can be, but are not limited to, an extrusion ratio of 18-35, an extrusion temperature of 380-420℃, and an extrusion rod speed of 0.5-2mm / s.

[0123] The extrusion temperature can be, but is not limited to, 380℃, 385℃, 390℃, 395℃, 400℃, 405℃, 410℃, 415℃, 420℃, etc., or can be, but is not limited to, 380-385℃, 385-390℃, 390-395℃, 395-400℃, 400-405℃, 405-410℃, 410-415℃, 415-420℃, etc.

[0124] The extrusion rod speed can be, but is not limited to, 0.5mm / s, 0.7mm / s, 0.9mm / s, 1.1mm / s, 1.3mm / s, 1.5mm / s, 1.7mm / s, 1.9mm / s, 2mm / s, etc., or can be, but is not limited to, 0.5-0.7mm / s, 0.7-0.9mm / s, 0.9-1.1mm / s, 1.1-1.3mm / s, 1.3-1.5mm / s, 1.5-1.7mm / s, 1.7-1.9mm / s, 1.9-2mm / s, etc.

[0125] The extrusion parameters in the embodiments of the present application enable the magnesium alloy to have good forming quality.

[0126] According to some embodiments of the present application, the heat treatment can be performed by, but is not limited to, aging treatment, which can be performed at room temperature or at a higher temperature.

[0127] In some optional embodiments, the heat treatment is performed at a temperature of 150-200℃ for a time of 6-16 hours.

[0128] The aging treatment temperature can be, but is not limited to, 150℃, 165℃, 170℃, 175℃, 178℃, 180℃, 185℃, 190℃, 193℃, 195℃, 200℃, etc., or can be, but is not limited to, 150-170℃, 175-185℃, 190-200℃, etc.

[0129] The aging treatment time can be, but is not limited to, 6 hours, 7 hours, 7.5 hours, 8 hours, 9 hours, 10 hours, 10.2 hours, 10.5 hours, 11 hours, 12 hours, 13 hours, 13.5 hours, 14 hours, 15 hours, 16 hours, etc., or can be, but is not limited to, 6-15 hours, 7.5-9 hours, 10.2-11 hours, 10 hours-13 hours, 13.5-16 hours, etc.

[0130] After the above heat treatment, the magnesium alloy has good strength and hardness.

[0131] According to some embodiments of the present application, the present application also provides a battery, the battery comprising the magnesium alloy as described above or the magnesium alloy prepared by the preparation method of the magnesium alloy as described above.

[0132] In the technical solution of the embodiments of the present application, the battery comprises the magnesium alloy, the magnesium alloy has an ignition point of 750 DEG C or higher and high mechanical properties, and can be safely used in vehicles such as new energy vehicles or other electric devices.

[0133] In some embodiments, the battery comprises a battery module, the battery module comprises an end plate, the end plate is located at an end of the battery module, and the magnesium alloy is used for the end plate.

[0134] The magnesium alloy provided by the present application can be used for the end plate 30 of the battery 100. The end plate 30 is located at the end of the battery module 20. The end plate 30 can be fixedly connected with the battery module 20. The end plate 30 can be used to form fixation and extrusion on the grouped battery monomers 20a. The end plate 30 can be a plate-shaped structural member located at the end of the battery module 20, or can be a support structural member constituting the frame of the battery module 20.

[0135] The magnesium alloy provided by the present application, as the end plate 30 of the battery 100, has high ignition point and good mechanical properties, and can increase the stability of the battery.

[0136] According to some embodiments of the present application, the present application also provides an electric device, comprising the battery provided by any one of the embodiments as described above, and the battery is used to provide electric energy for the electric device.

[0137] The electric device can be, but is not limited to, the equipment or system of any one of the application batteries as described above.

[0138] The preparation process and test data are introduced as follows:

[0139] Embodiment 1:

[0140] The magnesium alloy provided in Embodiment 1 has the following components: the mass percentage of Zn is 5.5%, the mass percentage of Zr is 0.1%, the mass percentage of Ce is 1%, the mass percentage of CaO is 1.5%, the impurities Fe <0.004%, Cu <0.02%, Ni <0.001%, and Si <0.05%, and the rest is magnesium.

[0141] The preparation method of the magnesium alloy in this embodiment comprises:

[0142] According to the mass percentages of Mg, Zn, Zr, Ce and CaO in the magnesium alloy, the corresponding pure Mg, pure Zn, Mg-30Ce intermediate alloy, CaO and Mg-20Zr intermediate alloy are provided;

[0143] SF6+N2 mixed gas is introduced into a smelting furnace, the pure Mg is added into the smelting furnace for melting, the pure Zn is added after the pure Mg is melted, the temperature of the smelting furnace is maintained while mechanical stirring treatment is carried out, the temperature of the smelting furnace is maintained at 650-680℃, the CaO is added after 10min-20min and stirring is carried out; the temperature is increased, the Mg-30Ce intermediate alloy is added when the temperature of the smelting furnace reaches 680-690℃ and stirring is carried out, finally the Mg-Zr intermediate alloy is added and stirring is carried out, the temperature of the smelting furnace is maintained and placed for 10min-15min, and the magnesium alloy liquid is obtained;

[0144] Pouring is carried out using a metal mold, and the size of the metal mold is Φ65*250mm;

[0145] After the ingot obtained by pouring is homogenized at 400℃ for 12h, the head and tail are removed and the skin is removed to obtain an extrusion billet of Φ50mm*120, the prepared extrusion billet is placed in an extrusion cylinder, and an extrusion rod of Φ10mm is obtained by extrusion, and the extrusion parameters are: extrusion ratio 25, extrusion temperature 400℃, and extrusion rod speed 1mm / s;

[0146] The extrusion rod is subjected to aging treatment, and the aging parameters are 175℃ and 8h.

[0147] Examples 2-11 and Comparative Example 1-2 are basically the same as Example 1, and the only difference is that the mass percentages of the elements in the provided magnesium alloy are different.

[0148] Examples 2-11 and Comparative Example 1-2 are basically the same as Example 1, and the only difference is that the mass percentages of the elements in the provided magnesium alloy are different.

[0149] The flame retardant properties of the magnesium alloys of Examples 1-11 and Comparative Example 1-2 are tested respectively:

[0150] The ignition point of the magnesium alloy is tested by Differential Thermal Analysis (DTA) method, and the temperature rising speed is 30℃ / min.

[0151] Table 1 Mass percentages of elements in the magnesium alloys of examples and comparative examples and performance parameters of the magnesium alloys

[0152] Sample Zn Zr CaO Ce La ignition point / °C Example 1 5.5％ 0.1％ 1.5％ 1％ 0 760 Example 2 3.8％ 0.1％ 0.5％ 3％ 0 750 Example 3 2.5％ 0.2％ 2％ 0.01％ 0 820 Example 4 4.5％ 0.2％ 1％ 0 2％ 755 Example 5 5.2％ 0.2％ 1.5％ 1％ 1.5％ 780 Example 6 2％ 0.01％ 0.5％ 0.01％ 0 770 Example 7 6.5％ 1％ 2％ 1％ 2％ 800 Example 8 5％ 0.5％ 1％ 1％ 1％ 805 Example 9 5.5％ 0.8％ 1.2％ 1％ 1.5％ 810 Example 10 6％ 0.8％ 1.5％ 0 2.5％ 820 Example 11 6.5％ 1％ 2％ 1％ 2％ 840 Comparative Example 1 5.8％ 0.2％ 0 0 0 505 Comparative Example 2 4.5％ 0.2％ 0 5％ 0 600

[0153] By comparing Examples 1-11 and Comparative Example 1-2, the present application is obtained by matching Zn, Zr, CaO, rare earth elements, magnesium and the like, and controlling the mass percentage of Zn to be 2%-6.5%, the mass percentage of rare earth elements to be 0.01%-3%, the mass percentage of Zr to be 0.01%-1%, and the mass percentage of CaO to be 0.5%-2%, and the rest is Mg and impurities, so that the ignition point of the magnesium alloy is above 750℃.

[0154] By comparing example 1-7 and example 8-11, the application further controls the mass percentage of Zn to be 5%-6.5%, the mass percentage of rare earth elements to be 2%-3%, the mass percentage of Zr to be 0.5%-1%, the mass percentage of CaO to be 1%-2%, and the rest to be Mg and impurities, so that the ignition point of the magnesium alloy is further improved.

[0155] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the application, but not to limit it; although the application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application, and they should be covered in the scope of the claims and the description of the application. Especially, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A magnesium alloy characterized by comprising, in mass %, Comprising: Zinc (Zn) at a mass percentage of 2%-6.5%; a rare earth element at a mass percentage of 0.01%-3%; Zirconium (Zr) at a mass percentage of 0.01%-1%; Calcium oxide (CaO) at a mass percentage of 0.5%-2%; and the rest being Mg and impurities; wherein the magnesium alloy has an average grain size of 6-10 µm.

2. The magnesium alloy according to claim 1, characterized by The rare earth element comprises at least one of lanthanum (La) and cerium (Ce).

3. The magnesium alloy according to claim 1 or 2, characterized in that, The mass percentage of Zn is 5%-6.5%; the mass percentage of the rare earth element is 2%-3%; the mass percentage of Zr is 0.5%-1%; the mass percentage of CaO is 1%-2%; and the rest is Mg and impurities.

4. The magnesium alloy according to claim 1, characterized by The mass percentage of the impurities is less than or equal to 0.075%.

5. The magnesium alloy according to claim 1, characterized by The impurities comprise at least one of Fe, Cu, Ni, and Si, wherein the mass percentage of Fe in the magnesium alloy is less than or equal to 0.004%, the mass percentage of Cu in the magnesium alloy is less than or equal to 0.02%, the mass percentage of Ni in the magnesium alloy is less than or equal to 0.001%, and the mass percentage of Si in the magnesium alloy is less than or equal to 0.05%.

6. The magnesium alloy according to claim 1, characterized by The magnesium alloy has an ignition point of greater than or equal to 750℃.

7. The magnesium alloy according to claim 6, characterized in that The magnesium alloy has an ignition point of greater than or equal to 800℃.

8. A method of producing a magnesium alloy as claimed in any one of claims 1 to 7, characterized in that, Comprising: providing pure Mg, pure Zn, Mg-rare earth element intermediate alloy, CaO, and Mg-Zr intermediate alloy according to the mass percentages of Mg, Zn, rare earth element, Zr, and CaO in the magnesium alloy; mixing the pure Mg, pure Zn, CaO, Mg-rare earth element intermediate alloy, and Mg-Zr intermediate alloy and melting to obtain a magnesium alloy liquid, the melting being performed in a protective gas; sequentially pouring, extruding, and heat treating the magnesium alloy liquid.

9. The method of producing a magnesium alloy according to claim 8, characterized by, The step of mixing the pure Mg, pure Zn, CaO, Mg-rare earth element intermediate alloy, and Mg-Zr intermediate alloy and melting to obtain a magnesium alloy liquid comprises: melting the pure Mg in a melting furnace, adding pure Zn after the pure Mg is melted, maintaining the temperature of the melting furnace while performing mechanical stirring treatment, maintaining the temperature of the melting furnace at 650-680℃, adding CaO after 10-20 min and stirring; increasing the temperature, adding the Mg-rare earth element intermediate alloy and stirring when the temperature of the melting furnace reaches 680-690℃, and finally adding the Mg-Zr intermediate alloy and stirring to obtain the magnesium alloy liquid.

10. The method of producing a magnesium alloy according to claim 9, characterized by, After the step of adding the Mg-rare earth element intermediate alloy and stirring at 680-690℃, the method further comprises: maintaining the temperature of the melting furnace at 680-690℃ for 10-15 min of standing to obtain the magnesium alloy liquid.

11. A battery, characterized by A magnesium alloy comprising the magnesium alloy of any one of claims 1-7 or prepared by the method of any one of claims 8-10.

12. The battery of claim 11, wherein the cathode comprises a lithium metal oxide. The battery includes a battery module including an end plate at an end of the battery module, and the magnesium alloy is used for the end plate.

13. An electrical device, characterized by The battery includes a battery module including an end plate at an end of the battery module, and the magnesium alloy is used for the end plate.

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