Battery liquid cooling plate high-strength composite plate ingot blank and preparation method thereof

Abstract

The application relates to a high-strength composite plate ingot blank for a battery liquid cooling plate and a preparation method thereof. The application aims to solve the problem of low yield rate of aluminum alloy flat ingots caused by casting forming difficulty and slag inclusion in a steady state during casting by using an existing method. The high-strength composite plate ingot blank for the battery liquid cooling plate is made of Si, Cu, Mn, Mg, Zn, Ti, Zr, Be, Fe and Al. The method comprises the following steps: S1, weighing smelting raw materials; S2, sequentially smelting the smelting raw materials; and S3, casting the alloy melt to obtain an aluminum alloy flat ingot. The application improves an existing smelting process, reduces the generation of ingot crack defects by combining scientific proportioning of components and fine operation in a production process, and makes the yield rate of the ingot reach 83%. The application is applied to the preparation field of the ingot for the battery liquid cooling plate.

Description

TECHNICAL FIELD

[0001] The application belongs to a high-strength composite plate ingot blank for a battery liquid cooling plate and a preparation method thereof. BACKGROUND

[0002] The Al-Mg-Si-Cu alloy has good machinability, high strength, good surface treatment performance and good corrosion resistance. However, the alloy has a complex chemical composition and phase composition, and has a great crack tendency during casting, a very narrow casting process parameter range, and a large slag inclusion tendency during casting, and is prone to slag inclusion cracks, and the ingot yield is only 45%. SUMMARY

[0003] The application aims to solve the problem of low yield of Al-Mg-Si-Cu alloy due to casting difficulty and easy slag inclusion during casting, and provides a high-strength composite plate ingot blank for a battery liquid cooling plate and a preparation method thereof.

[0004] The high-strength composite plate ingot blank for a battery liquid cooling plate according to the application is composed of 0.3-0.5% of Si, 0.1-0.3% of Cu, 0.05-0.15% of Mn, 0.6-0.8% of Mg, 0.1-0.3% of Zn, 0.01-0.04% of Ti, 0.03-0.06% of Zr, 0.0001-0.0004% of Be, Fe <0.15% and the balance of Al by mass fraction. The single impurity is ≤0.05%, and the total impurity is ≤0.15%.

[0005] The preparation method of the high-strength composite plate ingot blank for a battery liquid cooling plate according to the application is carried out according to the following steps:

[0006] I. batching:

[0007] According to mass fraction: Si is 0.3-0.5%, Cu is 0.1-0.3%, Mn is 0.05-0.15%, Mg is 0.6-0.8%, Zn is 0.1-0.3%, Ti is 0.01-0.04%, Zr is 0.03-0.06%, Be is 0.0001-0.0004%, Fe <0.15% and the balance is Al, pure aluminum ingot, aluminum silicon intermediate alloy, aluminum copper intermediate alloy, aluminum manganese intermediate alloy, pure magnesium ingot, pure zinc ingot, aluminum titanium intermediate alloy, aluminum zirconium intermediate alloy and aluminum beryllium intermediate alloy are weighed respectively;

[0008] II. Melting:

[0009] The weighed pure aluminum ingot, aluminum silicon intermediate alloy, aluminum copper intermediate alloy, aluminum manganese intermediate alloy and aluminum zirconium intermediate alloy are added into a melting furnace, the pure zinc ingot is added after the melt softens and collapses, the pure magnesium ingot, aluminum titanium intermediate alloy and aluminum beryllium intermediate alloy are added when the melt temperature is 720-730 DEG C, and the electromagnetic stirring is carried out at 720-760 DEG C for 30-40 min, the chemical composition is analyzed by sampling, the chemical composition is qualified, the flux is covered, then the refined alloy melt is obtained after the refining at 720-760 DEG C for 30-40 min and standing for 30-60 min;

[0010] III. Casting:

[0011] The refined alloy melt is first flowed into an online degassing device, then flowed into a filtering device, and then injected into a crystallizer at a casting speed of 38-40 mm / min, a flow disc gate temperature of 695-705 DEG C, a casting cooling water flow of 95-105 m 3 / h, and an online seeding Al-5Ti-B wire of 600-700 mm / min to carry out semi-continuous casting, so as to obtain an aluminum alloy ingot;

[0012] IV. Homogenization annealing:

[0013] The aluminum alloy ingot is heated to 545-555 DEG C, and is kept at 545-555 DEG C for 10-11 h, so as to obtain the high-strength composite plate ingot blank for the battery liquid cooling plate.

[0014] Advantages of the present application:

[0015] Compared with the traditional Al-Mg-Si-Cu alloy, the high-performance Al-Mg-Si-Cu alloy high-strength composite plate ingot blank for the battery liquid cooling plate prepared by the present application reasonably adds Zr element and Ti element, Zr and Al form ZrAl3 compound to hinder the recrystallization process, refine the recrystallized grains, and have the effect of solid solution strengthening. Ti and Al form TiAl3 phase to become a non-spontaneous core during crystallization, which can refine the as-cast structure, and when Zr and Mn exist together, the impact strength of the alloy can be significantly improved.

[0016] Be has active chemical properties and belongs to oxygenophilic elements, can form a dense oxide film on the metal surface, is stable even in a red-hot state in the air, can improve the oxide film properties of the aluminum alloy, avoid the oxidation of the inclusions in the casting process, and prevent the ingot inclusions cracks.

[0017] Cu helps to improve the high strength level of the material, and enhances the overall wear resistance of the material over time.

[0018] At the same time, the content of Fe impurity is strictly controlled by using fine aluminum ingot, and the content of impurity is controlled to be Fe<0.15%, and the main reason is that Fe element can form hard and brittle FeSiAl5 (or Fe2Si2Al9) which is difficult to dissolve, and the plasticity of the alloy is reduced, and the alloy is easily broken during later rolling.

[0019] The application obtains the high-strength composite plate ingot blank for battery liquid cooling plate, which has qualified chemical composition, no cracks and slag inclusions on the surface, and the yield reaches 83%. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The physical map of the high-strength composite plate ingot blank for battery liquid cooling plate prepared in the embodiment. DETAILED DESCRIPTION

[0021] Specific implementation one: the high-strength composite plate ingot blank for battery liquid cooling plate according to the embodiment is composed of 0.3-0.5% of Si, 0.1-0.3% of Cu, 0.05-0.15% of Mn, 0.6-0.8% of Mg, 0.1-0.3% of Zn, 0.01-0.04% of Ti, 0.03-0.06% of Zr, 0.0001-0.0004% of Be, Fe<0.15% and the balance of Al.

[0022] The content of aluminum in the pure aluminum ingot is 99.85%. The content of silicon in the aluminum-silicon intermediate alloy is 20%, the content of copper in the aluminum-copper intermediate alloy is 40%, the content of manganese in the aluminum-manganese intermediate alloy is 10%, the content of titanium in the aluminum-titanium intermediate alloy is 6%, and the content of zirconium in the aluminum-zirconium intermediate alloy is 3%, and the content of beryllium in the aluminum-beryllium intermediate alloy is 3%.

[0023] Specific implementation two: the preparation method of the high-strength composite plate ingot blank for battery liquid cooling plate according to the embodiment is performed according to the following steps:

[0024] I. batching:

[0025] According to the mass fraction, Si is 0.3-0.5%, Cu is 0.1-0.3%, Mn is 0.05-0.15%, Mg is 0.6-0.8%, Zn is 0.1-0.3%, Ti is 0.01-0.04%, Zr is 0.03-0.06%, Be is 0.0001-0.0004%, Fe is <0.15%, and the balance is Al, and the pure aluminum ingot, the aluminum-silicon intermediate alloy, the aluminum-copper intermediate alloy, the aluminum-manganese intermediate alloy, the pure magnesium ingot, the pure zinc ingot, the aluminum-titanium intermediate alloy, the aluminum-zirconium intermediate alloy and the aluminum-beryllium intermediate alloy are weighed respectively;

[0026] II. melting:

[0027] The weighed pure aluminum ingot, aluminum silicon intermediate alloy, aluminum copper intermediate alloy, aluminum manganese intermediate alloy and aluminum zirconium intermediate alloy are added into a melting furnace, when the melt softens and collapses, pure zinc ingot is added, when the melt temperature is 720-730℃, pure magnesium ingot, aluminum titanium intermediate alloy and aluminum beryllium intermediate alloy are added, and electromagnetic stirring is carried out at 720-760℃ for 30-40min, the chemical composition is analyzed by sampling, after the chemical composition is qualified, the flux is covered, then the alloy melt after refining is introduced into a holding furnace at 720-760℃, and is refined for 30-40min, and is then placed for 30-60min, to obtain the alloy melt after refining;

[0028] III. Casting:

[0029] The refined alloy melt is first flowed into an online degassing device, then flowed into a filtering device, and then injected into a crystallizer at a casting speed of 38-40mm / min, a flow disc gate temperature of 695-705℃, a casting cooling water flow of 95-105m 3 / h, and an online seeding Al-5Ti-B wire of 600-700mm / min, to carry out semi-continuous casting, to obtain an aluminum alloy ingot;

[0030] IV. Homogenization annealing:

[0031] The aluminum alloy ingot is heated to 545-555℃, and is kept at 545-555℃ for 10-11h, to obtain a high-strength composite plate ingot blank for a battery liquid cooling plate.

[0032] Specific embodiment three: different from the specific embodiment two, in step two, the covered flux is composed of 40% KCl, 45% MgCl2, 8% BaCl2 and 7% NaCl+CaCl2 by mass percentage, and the added amount is 5kg / t of the melt. The others are the same as the specific embodiment two.

[0033] Specific embodiment four: different from the specific embodiment two or three, in step two, the electromagnetic stirring frequency is 0.8Hz, the intensity is set to 80%, the reversing time is 180s, the intermittent time is 15s, and the stirring time is 30min. The others are the same as the specific embodiment two or three.

[0034] Specific embodiment five: different from one of the specific embodiments two to four, in step two, the refining gas is 99.99% argon, the flow rate is set to 20Nl / min, and the running time is set to 30min. The others are the same as one of the specific embodiments two to four.

[0035] Sixth embodiment: the difference between this embodiment and one of the second to fifth embodiments is that the gas in the degassing device in step three is argon with a purity of 99.99%. The others are the same as one of the second to fifth embodiments.

[0036] Seventh embodiment: the difference between this embodiment and one of the second to sixth embodiments is that the filtering device in step three adopts double-stage filtering, and the precision of the ceramic sheets is 30 mesh and 50 mesh respectively. The others are the same as one of the second to sixth embodiments.

[0037] Eighth embodiment: the difference between this embodiment and one of the second to seventh embodiments is that step three is carried out under the conditions of a holding furnace material temperature of 740℃, a casting speed of 40mm / min, a flow disc brake plate temperature of 695℃, and a casting cooling water flow of 100m 3 / h. The others are the same as one of the second to seventh embodiments.

[0038] Ninth embodiment: the difference between this embodiment and one of the second to eighth embodiments is that the Ti content in the Al-5Ti-B wire in step three is 5%, the B content is 1%, and the rest is Al, and the seeding speed is 680mm / min. The others are the same as one of the second to eighth embodiments.

[0039] Tenth embodiment: the difference between this embodiment and one of the second to ninth embodiments is that the homogenization annealing in step four is carried out at a temperature of 550℃ for 10h. The others are the same as one of the second to ninth embodiments.

[0040] The content of the application is not limited to the above-mentioned embodiments, and the combination of one or more of the embodiments can also achieve the purpose of the application.

[0041] The application will be described in detail below with reference to specific embodiments:

[0042] Example 1: A high-strength composite plate ingot for battery liquid cooling plate and a preparation method thereof, which is carried out according to the following steps:

[0043] Step S1: batching:

[0044] According to the mass fraction: Si is 0.42%, Cu is 0.25%, Mn is 0.12%, Mg is 0.75%, Zn is 0.25%, Ti is 0.025%, Zr is 0.05%, Be is 0.0003%, Fe is less than 0.15%, and the rest is Al, pure aluminum ingot with an aluminum content of 99.85%, aluminum silicon intermediate alloy, aluminum copper intermediate alloy, aluminum manganese intermediate alloy, pure magnesium ingot, pure zinc ingot, aluminum titanium intermediate alloy, aluminum zirconium intermediate alloy and aluminum beryllium intermediate alloy are weighed respectively;

[0045] Step S2: Melting:

[0046] The pure aluminum ingot, aluminum silicon intermediate alloy, aluminum copper intermediate alloy, aluminum manganese intermediate alloy and aluminum zirconium intermediate alloy weighed in step S1 are first added to a melting furnace. After the melt softens and collapses, the pure zinc ingot is added. When the melt temperature is 725℃, the magnesium ingot, aluminum titanium intermediate alloy and aluminum beryllium intermediate alloy are added, and stirring is performed at 730℃ for 40 min using electromagnetic stirring. After sampling and analyzing the chemical composition, when the chemical composition is qualified, the melt is covered with flux, and the melt is introduced into a holding furnace at 740℃. After refining for 30 min by opening the air brick, the alloy melt after refining is obtained after standing for 50 min;

[0047] Step S3: Casting:

[0048] The refined alloy melt obtained in the holding furnace at 740℃ is first flowed into an online degassing device, then flowed into a filtering device, and then injected into a crystallizer at a casting speed of 38 mm / min, a flow disc gate temperature of 698℃, a casting cooling water flow rate of 95 m 3 / h, and an Al-5Ti-B wire seeding speed of 680 mm / min to perform semi-continuous casting, thereby obtaining an aluminum alloy ingot with a size of 440 mm x 1450 mm x 4320 mm.

[0049] Step S4: Homogenization annealing:

[0050] The aluminum alloy ingot obtained in step S3 is heated to 550℃ and held at 550℃ for 10 h, thereby obtaining a high-strength composite plate ingot blank for a battery liquid cooling plate.

[0051] The high-strength composite plate ingot blank for a battery liquid cooling plate obtained in this example has a qualified chemical composition, no surface cracks, slag inclusions and other defects, and a yield rate of 83%.

Claims

1. A high-strength composite plate ingot blank for a battery liquid cooling plate, characterized by, The ingot blank of the high-strength composite plate for the battery liquid cooling plate is prepared by the following steps: The ingot blank of the high-strength composite plate for the battery liquid cooling plate is prepared by the following steps: I. ingredient: The pure aluminum ingot, the aluminum silicon intermediate alloy, the aluminum copper intermediate alloy, the aluminum manganese intermediate alloy, the pure magnesium ingot, the pure zinc ingot, the aluminum titanium intermediate alloy, the aluminum zirconium intermediate alloy and the aluminum beryllium intermediate alloy are weighed according to the above mass fraction; II. Melting: The weighed pure aluminum ingot, aluminum silicon intermediate alloy, aluminum copper intermediate alloy, aluminum manganese intermediate alloy and aluminum zirconium intermediate alloy are added to the melting furnace. When the melt softens and collapses, the pure zinc ingot is added. When the melt temperature is 720-730℃, the pure magnesium ingot, aluminum titanium intermediate alloy and aluminum beryllium intermediate alloy are added, and the electromagnetic stirring is carried out at 720-760℃ for 30-40min. The chemical composition is analyzed and sampled. After the chemical composition is qualified, the flux is covered, and then the flux is introduced into the holding furnace at 720-760℃. After refining for 30-40min, it is statically placed for 30-60min to obtain the refined alloy melt; III. Casting: The refined alloy melt is first flowed into an on-line degassing device, then into a filtering device, and then through a flow disc at a casting speed of 38-40 mm / min, a flow disc gate temperature of 695-705℃, a casting cooling water flow of 95-105 m 3 / h, and under the condition that the melt is injected into a crystallizer for semi-continuous casting at a speed of 600-700 mm / min under the action of an on-line seeding Al-5Ti-B wire, an aluminum alloy ingot is obtained. IV. Homogenization annealing: The aluminum alloy ingot is heated to 545-555℃, and is kept at 545-555℃ for 10-11h to obtain the high-strength composite plate ingot blank for the battery liquid cooling plate.

2. The high-strength composite plate ingot blank for a battery liquid cold plate according to claim 1, characterized by, The flux covered in step two is composed of 40% KCl, 45% MgCl2, 8% BaCl2 and 7% NaCl+CaCl2 by mass fraction, and the amount added is 5kg / t of melt.

3. The high-strength composite plate ingot blank for a battery liquid cold plate according to claim 1, characterized by, The electromagnetic stirring frequency in step two is 0.8Hz, the intensity is set to 80%, the reversing time is 180s, the intermittent time is 15s, and the stirring time is 30min.

4. The high-strength composite plate ingot blank for a battery liquid cold plate according to claim 1, characterized by, The refining gas in step two is 99.99% argon, the flow rate is set to 20Nl / min, and the running time is set to 30min.

5. The high-strength composite plate ingot blank for a battery liquid cold plate according to claim 1, characterized by, The gas purity in the degassing device in step three is 99.99% argon.

6. The high-strength composite plate ingot blank for a battery liquid cold plate according to claim 1, characterized by, The filtering device in step three adopts double-stage filtration, and the precision of the ceramic sheet is 30mesh and 50mesh respectively.

7. The high-strength composite plate ingot blank for a battery liquid cold plate according to claim 1, characterized by, Step three is semi-continuous casting under the conditions of holding furnace temperature at 740℃, casting speed at 40mm / min, temperature of flow disc brake plate at 695℃, and casting cooling water flow at 100m 3 / h.

8. The high-strength composite plate ingot blank for a battery liquid cold plate according to claim 1, characterized by, The Ti content in the Al-5Ti-B wire seeded online in step three is 5%, the B content is 1%, and the rest is Al. In addition, the seeding speed is 680mm / min.

9. The high-strength composite plate ingot blank for a battery liquid cold plate according to claim 1, characterized by, In step four, the homogenization annealing is carried out at 550℃ for 10h.

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