Aluminum alloy composite liquid cooling plate and preparation method and application thereof

Abstract

The invention provides an aluminum alloy composite liquid cooling plate and a preparation method and application thereof, and belongs to the technical field of aluminum alloy materials. A proper amount of Si and Mg are added into the core layer, so that a proper amount of Mg2Si with an aging strengthening effect can be generated, the aging strengthening effect is enhanced, the strength of the plate is improved, and the purpose of reducing the thickness of the material is achieved; meanwhile, excessive Si and Mg2Si can be prevented from reducing the corrosion resistance of the material; the content of Cr is controlled within 0.1%, precipitation of an Mg2Si phase at a grain boundary can be inhibited, the natural aging process is delayed, and the strength after artificial aging is improved; a small amount of Si is added into the first barrier layer and the second barrier layer, so that the strength of the material can be improved, and the corrosion resistance of the material is prevented from being reduced by excessive Si; by adding a proper amount of Mn, the strength of the material can be improved, and meanwhile, the corrosion resistance of the material is prevented from being reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of aluminum alloy materials, and in particular relates to an aluminum alloy composite liquid cooling plate and a preparation method and application thereof. Background Art

[0002] At present, the development of new energy vehicles is in the ascendant. New energy batteries are key components of automobiles, so the cooling of power batteries is particularly important. The component used for battery cooling is an aluminum alloy composite liquid cooling plate, which is usually a double-layer structure of brazing layer + core layer. The brazing layer is 4343 or 4045, accounting for about 10% of the thickness, and the core layer is 3003 alloy. The production process of this product is mature, the quality is relatively stable, it can meet the needs of most markets, and has been used in multiple new energy vehicle brands.

[0003] As the market's requirements for products continue to increase, the demand for lightweight materials is also increasing. Due to its own characteristics, this product cannot achieve higher strength, which hinders its application in thinner products. In order to improve strength, the conventional solution is to add a certain amount of Cu to the aluminum alloy core layer. Although Cu can improve material strength, higher Cu will also reduce the corrosion resistance of the material and shorten the service life of the material.

[0004] Therefore, how to make the aluminum alloy composite liquid cooling plate have both high strength and excellent corrosion resistance has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0005] The purpose of the present invention is to provide an aluminum alloy composite liquid cooling plate and a preparation method and application thereof. The aluminum alloy composite liquid cooling plate provided by the present invention has both high strength and excellent corrosion resistance.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides an aluminum alloy composite liquid cooling plate, comprising a brazing layer, a first barrier layer, a core layer and a second barrier layer stacked in sequence;

[0008] The chemical composition of the core layer includes, by mass percentage, Si 0.5-1.0%, Mg 0.5-1.0%, Cu 0.1-0.3%, Fe 0.2-0.5%, Cr≤0.1% and the balance Al;

[0009] The chemical compositions of the first barrier layer and the second barrier layer independently include, by mass percentage, Si≤0.5%, Mn 0.5-1.0%, Fe≤0.7% and the balance Al.

[0010] Preferably, the brazing layer is 4045 aluminum alloy.

[0011] Preferably, the thickness of the brazing layer is 5-15% of the total thickness of the aluminum alloy composite liquid cooling plate.

[0012] Preferably, the chemical composition of the core layer includes, by mass percentage, 0.67-0.9% Si, 0.6-0.87% Mg, 0.15-0.25% Cu, 0.3-0.4% Fe, 0.01-0.08% Cr and the balance Al.

[0013] Preferably, the chemical compositions of the first barrier layer and the second barrier layer independently include, by mass percentage: Si 0.1-0.5%, Mn 0.6-0.85%, Fe≤0.7% and the balance Al.

[0014] Preferably, the thickness of the first barrier layer is 15-25% of the total thickness of the aluminum alloy composite liquid cooling plate, and the thickness of the second barrier layer is 10-15% of the total thickness of the aluminum alloy composite liquid cooling plate.

[0015] The present invention also provides a method for preparing the aluminum alloy composite liquid cooling plate described in the above technical solution, comprising the following steps:

[0016] (1) subjecting the raw material of the brazing layer to first smelting, first casting, first milling and first hot rolling in sequence to obtain the brazing layer;

[0017] (2) subjecting the raw material of the core layer to a second smelting, a second casting, a homogenization treatment, and a second milling in sequence to obtain the core layer;

[0018] (3) subjecting the raw materials of the first barrier layer and the second barrier layer to a third smelting, a third casting, a third milling and a second hot rolling, respectively, to obtain the first barrier layer and the second barrier layer;

[0019] (4) the brazing layer obtained in step (1), the first barrier layer obtained in step (3), the core layer obtained in step (2) and the second barrier layer obtained in step (3) are sequentially composited, hot-rolled, cold-rolled and annealed to obtain an aluminum alloy composite liquid cooling plate;

[0020] There is no order of precedence for steps (1) to (3).

[0021] Preferably, the temperature of the third hot rolling in step (4) is 500-520°C.

[0022] Preferably, the annealing holding temperature in step (4) is 300-380° C., and the annealing holding time is 1-3 hours.

[0023] The present invention also provides the application of the aluminum alloy composite liquid cooling plate described in the above technical solution or the aluminum alloy composite liquid cooling plate prepared by the preparation method described in the above technical solution in the field of new energy vehicles.

[0024] The present invention provides an aluminum alloy composite liquid cooling plate, comprising a brazing layer, a first barrier layer, a core layer and a second barrier layer stacked in sequence; the chemical composition of the core layer includes, by mass percentage, Si 0.5-1.0%, Mg 0.5-1.0%, Cu 0.1-0.3%, Fe 0.2-0.5%, Cr≤0.1% and the balance Al; the chemical composition of the first barrier layer and the second barrier layer independently includes, by mass percentage, Si≤0.5%, Mn 0.5-1.0%, Fe≤0.7% and the balance Al. The present invention adds a proper amount of Si and Mg to the core layer to generate a proper amount of Mg with aging strengthening effect. 2 Si can enhance the aging strengthening effect and improve the strength of the plate, thereby achieving the purpose of thinning the material thickness; at the same time, it can also avoid excessive Si and Mg 2 Si reduces the corrosion resistance of the material; controlling the Cr content within 0.1% can inhibit the Mg 2 The precipitation of Si phase at the grain boundary delays the natural aging process and improves the strength after artificial aging; adding a small amount of Si in the first barrier layer and the second barrier layer can improve the strength of the material while avoiding excessive Si reducing the corrosion resistance of the material; adding an appropriate amount of Mn can improve the strength of the material while avoiding reducing the corrosion resistance of the material. The experimental results show that the difference in tensile strength between the aluminum alloy composite liquid cooling plate provided by the present invention after natural aging for 30 days after brazing and before brazing is 91MPa; the corrosion depth after brazing is 40.0μm. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the aluminum alloy composite liquid cooling plate provided by the present invention;

[0026] Figure 2 This is a corrosion depth diagram of the second barrier layer of the aluminum alloy composite liquid cooling plate prepared in Example 2;

[0027] Figure 3 This is the corrosion depth diagram of the second barrier layer of the aluminum alloy composite liquid cooling plate prepared in Comparative Example 3. DETAILED DESCRIPTION

[0028] The present invention provides an aluminum alloy composite liquid cooling plate, comprising a brazing layer, a first barrier layer, a core layer and a second barrier layer stacked in sequence;

[0029] The chemical composition of the core layer includes, by mass percentage, Si 0.5-1.0%, Mg 0.5-1.0%, Cu 0.1-0.3%, Fe 0.2-0.5%, Cr≤0.1% and the balance Al;

[0030] The chemical compositions of the first barrier layer and the second barrier layer independently include, by mass percentage, Si≤0.5%, Mn 0.5-1.0%, Fe≤0.7% and the balance Al.

[0031] In the present invention, the aluminum alloy composite liquid cooling plate includes a brazing layer.

[0032] In the present invention, the brazing layer is preferably 4045 aluminum alloy. The present invention has no special limitation on the specific composition of the 4045 aluminum alloy, and the national standard can be adopted.

[0033] In the present invention, the thickness of the brazing layer is preferably 5 to 15% of the total thickness of the aluminum alloy composite liquid cooling plate, and more preferably 10 to 12%.

[0034] In the present invention, the aluminum alloy composite liquid cooling plate further includes a first barrier layer adjacent to the brazing layer.

[0035] In the present invention, the chemical composition of the first barrier layer includes, by mass percentage, Si≤0.5%, Mn0.5-1.0%, Fe≤0.7% and the balance of Al, preferably Si 0.1-0.5%, Mn 0.6-0.85%, Fe≤0.7% and the balance of Al, more preferably Si 0.4-0.5%, Mn 0.6-0.7%, Fe 0.106-0.2% and the balance of Al. In the present invention, the first barrier layer is a modified 3-series aluminum alloy, which can improve the strength of the material by adding a small amount of Si while avoiding excessive Si from reducing the corrosion resistance of the material. Too much Si content, >0.5%, will reduce the corrosion resistance of the material; by adding an appropriate amount of Mn, the strength of the material can be improved while avoiding reducing the corrosion resistance of the material. Too little Mn content, <0.5%, will lead to insufficient strength of the barrier layer and reduce the overall strength of the material. Too high content, >1.0%, will reduce the corrosion resistance of the material.

[0036] In the present invention, the thickness of the first barrier layer is preferably 15-25% of the total thickness of the aluminum alloy composite liquid cooling plate, and more preferably 20-25%. In the present invention, if the thickness of the first barrier layer is too thin, <15%, it cannot block the diffusion of Mg in the core layer during brazing. After brazing, Mg diffuses to the surface of the brazing layer and reacts with the brazing agent, poisoning the brazing agent, thereby causing the brazing agent to lose the ability to remove the oxide film, causing poor brazing; if the thickness is too thick, >25%, the thickness of the core layer will be correspondingly thinned, thereby reducing the aging strengthening effect of the material.

[0037] In the present invention, the aluminum alloy composite liquid cooling plate further includes a core layer adjacent to the first barrier layer.

[0038] In the present invention, the chemical composition of the core layer includes, by mass percentage, Si 0.5-1.0%, Mg 0.5-1.0%, Cu 0.1-0.3%, Fe 0.2-0.5%, Cr≤0.1% and the balance Al, preferably includes: Si 0.67-0.9%, Mg 0.6-0.87%, Cu 0.15-0.25%, Fe 0.3-0.41%, Cr 0.01-0.08% and the balance Al, more preferably includes: Si 0.67-0.7%, Mg 0.7-0.87%, Cu 0.178-0.25%, Fe 0.3-0.35%, Cr 0.01-0.05% and the balance Al. In the present invention, the core layer is a modified 6 series aluminum alloy, which contains 0.5-1.0% Si. When the content is less than 0.5%, Mg with aging strengthening effect is generated. 2 Too little Si will reduce the aging strengthening effect and fail to achieve the purpose of thinning the material thickness. Too much Si (>1.0%) will reduce the melting point of the material and easily cause corrosion. Excessive Si and Mg 2 Si will reduce the corrosion resistance of the material; adding 0.5-1.0% Mg, the content is too little, and when it is less than 0.5%, Mg with aging strengthening effect will be generated. 2 Too little Si will reduce the aging strengthening effect and fail to achieve the purpose of thinning the material thickness. Too much Si, when it is greater than 1.0%, will generate a large amount of Mg 2 Si phase leads to too strong aging strengthening effect, which easily causes material deformation after brazing; Cr is controlled within 0.1%, Cr can inhibit Mg 2 The precipitation of Si phase at the grain boundary delays the natural aging process and improves the strength after artificial aging. When the Cr content is too high (>0.1%), the material immediately has higher strength after brazing, which causes material deformation.

[0039] In the present invention, the aluminum alloy composite liquid cooling plate further includes a second barrier layer adjacent to the core layer.

[0040] In the present invention, the chemical composition of the second barrier layer includes, by mass percentage, Si≤0.5%, Mn0.5-1.0%, Fe≤0.7% and the balance of Al, preferably Si 0.1-0.5%, Mn 0.6-0.85%, Fe≤0.7% and the balance of Al, more preferably Si 0.4-0.5%, Mn 0.6-0.7%, Fe≤0.7% and the balance of Al. In the present invention, the second barrier layer is a modified 3-series aluminum alloy, which can improve the strength of the material by adding a small amount of Si while avoiding excessive Si from reducing the corrosion resistance of the material. Too much Si content, >0.5%, will reduce the corrosion resistance of the material; by adding an appropriate amount of Mn, the strength of the material can be improved while avoiding reducing the corrosion resistance of the material. Too little Mn content, <0.5%, will lead to insufficient strength of the barrier layer and reduce the overall strength of the material. Too high content, >1.0%, will reduce the corrosion resistance of the material.

[0041] In the present invention, the thickness of the second barrier layer is preferably 10-15% of the total thickness of the aluminum alloy composite liquid cold plate, and more preferably 12-15%. In the present invention, if the thickness of the second barrier layer is too thin, <10%, the Mg in the core layer diffuses to the surface of the aluminum material during brazing to form a gray-black oxide film, resulting in poor appearance. If the thickness of the second barrier layer is too thick, >15%, the thickness of the core layer will be correspondingly thinned, thereby reducing the aging strengthening effect of the material.

[0042] The strength of the aluminum alloy composite liquid cooling plate provided by the present invention cannot be too high before brazing, otherwise it is easy to crack during stamping. The material will not reach high strength immediately after brazing, otherwise it will cause material deformation and make it impossible to assemble. Instead, as the storage time increases, the strength will gradually increase, which has the so-called aging strengthening effect. At the same time, the aluminum alloy composite liquid cooling plate has good brazing performance and corrosion resistance.

[0043] The present invention adds appropriate amounts of Si and Mg to the core layer to generate appropriate amounts of Mg with aging strengthening effect. 2 Si can enhance the aging strengthening effect and improve the strength of the plate, thereby achieving the purpose of thinning the material thickness; at the same time, it can also avoid excessive Si and Mg 2 Si reduces the corrosion resistance of the material; controlling the Cr content within 0.1% can inhibit the Mg 2 The precipitation of Si phase at the grain boundary delays the natural aging process and improves the strength after artificial aging; adding a small amount of Si in the first barrier layer and the second barrier layer can improve the strength of the material while avoiding excessive Si reducing the corrosion resistance of the material; adding an appropriate amount of Mn can improve the strength of the material while avoiding reducing the corrosion resistance of the material.

[0044] The structural schematic diagram of the aluminum alloy composite liquid cooling plate provided by the present invention is as follows Figure 1 shown.

[0045] from Figure 1 It can be seen that the aluminum alloy composite liquid cooling plate has a four-layer structure, including a brazing layer, a first barrier layer, a core layer and a second barrier layer stacked in sequence.

[0046] The present invention also provides a method for preparing the aluminum alloy composite liquid cooling plate described in the above technical solution, comprising the following steps:

[0047] (1) subjecting the raw material of the brazing layer to first smelting, first casting, first milling and first hot rolling in sequence to obtain the brazing layer;

[0048] (2) subjecting the raw material of the core layer to a second smelting, a second casting, a homogenization treatment, and a second milling in sequence to obtain the core layer;

[0049] (3) subjecting the raw materials of the first barrier layer and the second barrier layer to a third smelting, a third casting, a third milling and a second hot rolling, respectively, to obtain the first barrier layer and the second barrier layer;

[0050] (4) the brazing layer obtained in step (1), the first barrier layer obtained in step (3), the core layer obtained in step (2) and the second barrier layer obtained in step (3) are sequentially composited, hot-rolled, cold-rolled and annealed to obtain an aluminum alloy composite liquid cooling plate;

[0051] There is no order of precedence for steps (1) to (3).

[0052] The present invention has no particular limitation on the sources of the raw materials, and commercially available products known to those skilled in the art may be used.

[0053] In the present invention, the first, second and third have no special meanings and are only used to distinguish the steps.

[0054] The present invention sequentially performs first smelting, first casting, first milling and first hot rolling on the raw materials of the brazing layer to obtain the brazing layer.

[0055] The present invention has no special limitation on the composition of the raw materials of the brazing layer, and any raw material composition well known to those skilled in the art may be used.

[0056] The present invention has no special limitation on the operations of the first smelting and the first casting, and operations well known to those skilled in the art may be adopted.

[0057] The present invention has no special limitation on the operation of the first milling surface. The two surfaces of the ingot obtained by casting can be respectively milled and removed by 5 to 15 mm by the operation well known to those skilled in the art.

[0058] In the present invention, the first hot rolling preferably includes a first heat preservation step on the product obtained by milling.

[0059] In the present invention, the constant temperature of the first insulation is preferably 500-520°C, more preferably 505-515°C; the first insulation time is preferably 4-8h, more preferably 4-6h; the time of heating to the first insulation is preferably 7-10h. The present invention has no special limitation on the heating rate, and the temperature can be heated to a constant temperature within the above time.

[0060] In the present invention, the temperature of the first hot rolling is preferably 480-500°C, more preferably 485-495°C.

[0061] The present invention has no special limitation on the deformation amount of the first hot rolling, as long as the thickness of the brazing layer is within the range of 35 to 100 mm.

[0062] After the first hot rolling is completed, the present invention preferably cools the product obtained by the first hot rolling to obtain a brazing layer.

[0063] The present invention has no special limitation on the cooling operation, and it only needs to be cooled naturally to room temperature.

[0064] In the present invention, the thickness of the brazing layer is preferably 35 to 100 mm, more preferably 37 to 42 mm.

[0065] The present invention sequentially performs second smelting, second casting, homogenization treatment and second milling on the raw materials of the core layer to obtain the core layer.

[0066] The present invention has no special limitation on the composition of the raw materials of the core layer, and any raw material composition well known to those skilled in the art may be used.

[0067] The present invention has no particular limitation on the second smelting and second casting operations, and operations well known to those skilled in the art may be adopted.

[0068] In the present invention, the holding temperature of the homogenization treatment is preferably 550-570°C, more preferably 560-565°C; the holding time of the homogenization treatment is preferably 8-12h, more preferably 9-10h. The present invention adopts homogenization treatment to remove residual stress.

[0069] In the present invention, the rate of heating to the homogenization treatment holding temperature is preferably 1.0-1.5°C / min, more preferably 1.3°C / min; the cooling method of the homogenization treatment is preferably air cooling after leaving the furnace.

[0070] The present invention has no special limitation on the operation of the second milling surface. The two surfaces of the product obtained by the homogenization treatment can be respectively milled and removed by 5 to 15 mm by the operation well known to those skilled in the art.

[0071] In the present invention, the raw materials of the first barrier layer and the second barrier layer are subjected to third smelting, third casting, third milling and second hot rolling in sequence to obtain the first barrier layer and the second barrier layer.

[0072] The present invention has no special limitation on the composition of the raw materials of the first barrier layer and the second barrier layer, and any raw material composition well known to those skilled in the art may be used.

[0073] The present invention has no special limitation on the operations of the third smelting and the third casting, and operations well known to those skilled in the art may be adopted.

[0074] The present invention has no special limitation on the operation of the third milling surface. The two surfaces of the ingot obtained by casting can be respectively milled and removed by 5 to 15 mm by the operation well known to those skilled in the art.

[0075] In the present invention, the second hot rolling preferably further includes a second heat preservation step of the product obtained by milling.

[0076] In the present invention, the constant temperature of the second heat preservation is preferably 520-540°C, more preferably 530°C; the time of the second heat preservation is preferably 4-8h, more preferably 5-6h; the time of heating to the second heat preservation is preferably 7-10h. The present invention has no special limitation on the heating rate, and the temperature can be raised to a constant temperature within the above time.

[0077] In the present invention, the temperature of the second hot rolling is preferably 500 to 520°C, more preferably 510 to 515°C.

[0078] The present invention has no special limitation on the deformation amount of the second hot rolling, as long as the thickness of the first barrier layer is within the range of 80 to 174 mm and the thickness of the second barrier layer is within the range of 52 to 104 mm.

[0079] After the second hot rolling is completed, the present invention preferably cools the product obtained by the second hot rolling to obtain the first barrier layer and the second barrier layer.

[0080] The present invention has no special limitation on the cooling operation, and it only needs to be cooled naturally to room temperature.

[0081] In the present invention, the thickness of the first barrier layer is preferably 80 to 174 mm; the thickness of the second barrier layer is preferably 52 to 104 mm.

[0082] After obtaining the brazing layer, the core layer, the first barrier layer and the second barrier layer, the present invention sequentially composites, performs a third hot rolling, cold rolling and annealing on the brazing layer, the first barrier layer, the core layer and the second barrier layer to obtain an aluminum alloy composite liquid cooling plate.

[0083] In the present invention, the composite is preferably welded by argon arc welding; the welding voltage is preferably 24-30V, more preferably 26-28V; the welding current is preferably 240-280A, more preferably 260-270A.

[0084] In the present invention, the composite product is preferably subjected to a third heat preservation before the third hot rolling; the constant temperature of the third heat preservation is preferably 520-540°C, more preferably 525-530°C; the time of the third heat preservation is preferably 12-18h, more preferably 15-16h. The heat preservation before the third hot rolling of the present invention is beneficial to the subsequent hot rolling. The present invention has no special limitation on the rate of heating to the third heat preservation constant temperature, and a rate well known to those skilled in the art can be used.

[0085] In the present invention, the temperature of the third hot rolling is preferably 500-520°C, more preferably 505-515°C.

[0086] The present invention has no special limitation on the deformation amount of the third hot rolling, as long as the thickness of the product obtained by hot rolling is ensured to be 6.5±0.5 mm.

[0087] After the hot rolling is completed, the present invention preferably cools the product obtained by the hot rolling. The present invention has no special limitation on the cooling operation, and the operation well known to those skilled in the art can be adopted.

[0088] In the present invention, the number of cold rolling passes is preferably 4 to 6, more preferably 5; the deformation amount of each cold rolling pass is preferably 20 to 40%, more preferably 25 to 30°C.

[0089] After the cold rolling is completed, the present invention preferably performs re-coiling, edge trimming, and stretch bending and straightening on the product obtained by the cold rolling.

[0090] The present invention has no special limitation on the re-coiling edge trimming operation, and the waste edge of the product obtained by cold rolling can be trimmed by an operation well known to those skilled in the art.

[0091] The present invention has no special limitation on the stretch-bend straightening operation, and operations well known to those skilled in the art may be adopted.

[0092] In the present invention, the holding temperature of the annealing is preferably 300-380°C, more preferably 320-340°C; the holding time of the annealing is preferably 1-3h, more preferably 2h; the cooling method of the annealing is preferably furnace cooling. The present invention has no special limitation on the operation of furnace cooling, and the operation familiar to those skilled in the art can be used. The present invention uses annealing to anneal the product obtained by cold rolling to the O state, which is beneficial to subsequent processing.

[0093] In the present invention, the annealing is preferably carried out in a nitrogen protection annealing furnace. The tensile strength of the product after annealing treatment is 90-140MPa, the yield strength is ≥35MPa, and the elongation is ≥20%.

[0094] After annealing is completed, the present invention preferably cuts and packages the products obtained by annealing in sequence and puts them into storage to obtain an aluminum alloy composite liquid cooling plate.

[0095] In the present invention, the thickness of the aluminum alloy composite liquid cooling plate is preferably 1.0 to 2.0 mm, and more preferably 1.2 to 1.5 mm.

[0096] The present invention has no special limitation on the cutting operation, and the cutting operation can be performed to the size specified by the customer.

[0097] The present invention has no special limitation on the operation of packaging storage, and operations well known to those skilled in the art may be adopted.

[0098] The preparation method provided by the invention has simple process and is suitable for industrial production.

[0099] The present invention also provides the application of the aluminum alloy composite liquid cooling plate described in the above technical solution or the aluminum alloy composite liquid cooling plate prepared by the preparation method described in the above technical solution in the field of new energy vehicles.

[0100] The present invention has no special limitation on the application operation of the aluminum alloy composite liquid cooling plate in the field of new energy vehicles, and the application operation familiar to those skilled in the art can be adopted.

[0101] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0102] Example 1

[0103] The aluminum alloy composite liquid cooling plate is composed of a brazing layer, a first barrier layer, a core layer and a second barrier layer stacked in sequence;

[0104] The brazing layer is 4045 aluminum alloy, and the chemical composition by mass percentage is: Si 10.46%, Fe 0.159%, impurities ≤ 0.03% and the balance Al;

[0105] The chemical composition of the core layer is as follows by mass percentage: Si 0.67%, Mg 0.87%, Cu 0.178%, Fe 0.41%, Cr 0.01% and the balance Al;

[0106] The chemical compositions of the first barrier layer and the second barrier layer are both as follows: Si 0.41%, Mn 0.69%, Fe 0.106% and the balance Al, in terms of mass percentage;

[0107] The thickness of the brazing layer is 7% of the total thickness of the aluminum alloy composite liquid cooling plate;

[0108] The thickness of the first barrier layer is 15% of the total thickness of the aluminum alloy composite liquid cooling plate;

[0109] The thickness of the second barrier layer is 12% of the total thickness of the aluminum alloy composite liquid cooling plate;

[0110] The thickness of the aluminum alloy composite liquid cooling plate is 1.2 mm;

[0111] The preparation method of the aluminum alloy composite liquid cooling plate comprises the following steps:

[0112] (1) melting and casting the raw materials of the brazing layer in sequence to obtain an ingot;

[0113] (2) milling 7.5 mm of each of the two large surfaces of the ingot obtained in step (1), then heating for 7 h, heating to 500° C. and keeping the temperature for 4 h, and then hot rolling at 485° C., and naturally cooling to room temperature to obtain a brazing layer with a thickness of 37 mm;

[0114] (3) melting and casting the raw materials of the core layer in sequence to obtain an ingot;

[0115] (4) homogenizing the ingot obtained in step (3), and then milling away 7.5 mm of each of the two large surfaces to obtain a core layer; wherein the holding temperature of the homogenization treatment is 570° C., the holding time is 10 h, the heating rate to the homogenization treatment holding temperature is 1.5° C. / min, and the cooling method is air cooling after the furnace is taken out;

[0116] (5) melting and casting the raw materials of the first barrier layer and the second barrier layer in sequence to obtain ingots;

[0117] (6) milling 7.5 mm from each of the two large surfaces of the ingot obtained in step (5), then heating for 8 h, heating to 520° C. and keeping the temperature for 6 h, and then hot rolling at 510° C., and naturally cooling to room temperature to obtain a first barrier layer with a thickness of 80 mm and a second barrier layer with a thickness of 64 mm;

[0118] (7) The brazing layer obtained in step (2), the first barrier layer obtained in step (6), the second barrier layer and the core layer obtained in step (4) are welded by argon arc welding, and then heated at 530°C for 15 hours, and then hot rolled and cold rolled in sequence, and then the waste edges are cut off by a rewinding trimmer, and then the oil stains and aluminum chips on the surface are cleaned by a bending and straightening cleaning machine, and the overall plate shape is optimized, and then annealed to O state by a nitrogen protection annealing furnace, and finally cut to the size specified by the customer by a shearing machine and packaged for storage to obtain an aluminum alloy composite liquid cold plate; wherein the welding voltage is 25V and the current is 250A; the hot rolling temperature is 505°C, and the thickness of the hot rolled product is 6.5mm; the number of cold rolling passes is 5, and the deformation amount per pass is 30%; the annealing holding temperature is 340°C, the holding time is 2h, and the cooling method is furnace cooling.

[0119] Example 2

[0120] The aluminum alloy composite liquid cooling plate is composed of a brazing layer, a first barrier layer, a core layer and a second barrier layer stacked in sequence;

[0121] The brazing layer is 4045 aluminum alloy, and the chemical composition by mass percentage is: Si 10.46%, Fe 0.159%, impurities ≤ 0.03% and the balance Al;

[0122] The chemical composition of the core layer is as follows by mass percentage: Si 0.67%, Mg 0.87%, Cu 0.178%, Fe 0.41%, Cr 0.01% and the balance Al;

[0123] The chemical compositions of the first barrier layer and the second barrier layer are both as follows: Si 0.41%, Mn 0.69%, Fe 0.106% and the balance Al, in terms of mass percentage;

[0124] The thickness of the brazing layer is 10% of the total thickness of the aluminum alloy composite liquid cooling plate;

[0125] The thickness of the first barrier layer is 25% of the total thickness of the aluminum alloy composite liquid cooling plate;

[0126] The thickness of the second barrier layer is 15% of the total thickness of the aluminum alloy composite liquid cooling plate;

[0127] The thickness of the aluminum alloy composite liquid cooling plate is 1.5 mm;

[0128] The preparation method of the aluminum alloy composite liquid cooling plate comprises the following steps:

[0129] (1) melting and casting the raw materials of the brazing layer in sequence to obtain an ingot;

[0130] (2) milling 8 mm from each of the two large surfaces of the ingot obtained in step (1), then heating for 8 h, heating to 505° C. and keeping the temperature for 4 h, and then hot rolling at 490° C., and naturally cooling to room temperature to obtain a brazing layer with a thickness of 70 mm;

[0131] (3) melting and casting the raw materials of the core layer in sequence to obtain an ingot;

[0132] (4) homogenizing the ingot obtained in step (3), and then milling 10 mm of each of the two large surfaces to obtain a core layer; wherein the holding temperature of the homogenization treatment is 560° C., the holding time is 11 h, the heating rate to the homogenization treatment holding temperature is 1.3° C. / min, and the cooling method is air cooling after the furnace is taken out;

[0133] (5) melting and casting the raw materials of the first barrier layer and the second barrier layer in sequence to obtain ingots;

[0134] (6) milling 8 mm from each of the two large surfaces of the ingot obtained in step (5), then heating for 7.5 h, heating to 530° C. and keeping the temperature for 5 h, and then hot rolling at 520° C., and naturally cooling to room temperature to obtain a first barrier layer with a thickness of 174 mm and a second barrier layer with a thickness of 104 mm;

[0135] (7) The brazing layer obtained in step (2), the first barrier layer obtained in step (6), the second barrier layer and the core layer obtained in step (4) are welded by argon arc welding, and then heated at 520°C for 17 hours, and then hot rolled and cold rolled in sequence, and then the waste edges are cut off by a rewinding trimmer, and then the oil stains and aluminum chips on the surface are cleaned by a bending and straightening cleaning machine, and the overall plate shape is optimized, and then annealed to the O state by a nitrogen protection annealing furnace, and finally cut to the customer-specified size by a shearing machine and packaged for storage to obtain an aluminum alloy composite liquid cold plate; wherein the welding voltage is 30V and the current is 270A; the hot rolling temperature is 515°C, and the thickness of the hot rolled product is 6.0mm; the number of cold rolling passes is 5, and the deformation per pass is 25%; the annealing holding temperature is 380°C, the holding time is 2h, and the cooling method is furnace cooling.

[0136] Comparative Example 1

[0137] The aluminum alloy composite liquid cooling plate is composed of a brazing layer, a first barrier layer, a core layer and a second barrier layer stacked in sequence;

[0138] The brazing layer is 4045 aluminum alloy, and the chemical composition is as follows by mass percentage: Si 9.7%, Fe 0.20%, the rest ≤ 0.03% and the balance Al;

[0139] The chemical composition of the core layer is as follows by mass percentage: Si 0.36%, Mg 0.85%, Cu 0.15%, Fe 0.36%, Cr 0.25% and the balance Al;

[0140] The chemical compositions of the first barrier layer and the second barrier layer are respectively: Si 0.15%, Mn 0.35%, Fe 0.13% and the balance Al in terms of mass percentage;

[0141] The thickness of the brazing layer is 15% of the total thickness of the aluminum alloy composite liquid cooling plate;

[0142] The thickness of the first barrier layer is 10% of the total thickness of the aluminum alloy composite liquid cooling plate;

[0143] The thickness of the second barrier layer is 8% of the total thickness of the aluminum alloy composite liquid cooling plate;

[0144] The thickness of the aluminum alloy composite liquid cooling plate is 1.8 mm;

[0145] The preparation method of the aluminum alloy composite liquid cooling plate comprises the following steps:

[0146] (1) melting and casting the raw materials of the brazing layer in sequence to obtain an ingot;

[0147] (2) milling 10 mm of each of the two large surfaces of the ingot obtained in step (1), then heating for 10 h, heating to 510° C. and keeping the temperature for 6 h, and then hot rolling at 495° C., and naturally cooling to room temperature to obtain a brazing layer with a thickness of 78 mm;

[0148] (3) melting and casting the raw materials of the core layer in sequence to obtain an ingot;

[0149] (4) homogenizing the ingot obtained in step (3), and then milling 10 mm of each of the two large surfaces to obtain a core layer; wherein the holding temperature of the homogenization treatment is 555° C., the holding time is 10.5 h, the heating rate to the homogenization treatment holding temperature is 1.35° C. / min, and the cooling method is air cooling after the furnace is taken out;

[0150] (5) melting and casting the raw materials of the first barrier layer and the second barrier layer in sequence to obtain ingots;

[0151] (6) milling 10 mm from each of the two large surfaces of the ingot obtained in step (5), then heating for 7 h, heating to 540° C. and keeping the temperature for 4 h, and then hot rolling at 515° C., and naturally cooling to room temperature to obtain a first barrier layer with a thickness of 52 mm and a second barrier layer with a thickness of 42 mm;

[0152] (7) The brazing layer obtained in step (2), the first barrier layer obtained in step (6), the second barrier layer and the core layer obtained in step (4) are welded by argon arc welding, and then heated at 540°C for 12 hours, and then hot rolled and cold rolled in sequence, and then the waste edges are cut off by a rewinding trimmer, and then the oil stains and aluminum chips on the surface are cleaned by a bending and straightening cleaning machine, and the overall plate shape is optimized, and then annealed to O state by a nitrogen protection annealing furnace, and finally cut to the customer-specified size by a shearing machine and packaged for storage to obtain an aluminum alloy composite liquid cold plate; wherein the welding voltage is 28V and the current is 260A; the hot rolling temperature is 520°C, and the thickness of the hot rolled product is 6.8mm; the number of cold rolling passes is 5, and the deformation per pass is 35%; the annealing holding temperature is 360°C, the holding time is 2h, and the cooling method is furnace cooling.

[0153] Comparative Example 2

[0154] The aluminum alloy composite liquid cooling plate is composed of a brazing layer, a first barrier layer, a core layer and a second barrier layer stacked in sequence;

[0155] The brazing layer is a 4045 aluminum alloy having the following chemical compositions by mass percentage: Si 9.7%, Fe 0.20%, the rest ≤ 0.03% and the balance Al;

[0156] The chemical composition of the core layer is as follows by mass percentage: Si 0.36%, Mg 0.85%, Cu 0.15%, Fe 0.36%, Cr 0.25% and the balance Al;

[0157] The chemical compositions of the first barrier layer and the second barrier layer are: Si 0.15%, Mn 0.35%, Fe 0.13% and the balance Al in terms of mass percentage;

[0158] The thickness of the brazing layer is 12% of the total thickness of the aluminum alloy composite liquid cooling plate;

[0159] The thickness of the first barrier layer is 28% of the total thickness of the aluminum alloy composite liquid cooling plate;

[0160] The thickness of the second barrier layer is 16% of the total thickness of the aluminum alloy composite liquid cooling plate;

[0161] The thickness of the aluminum alloy composite liquid cooling plate is 1.0 mm;

[0162] The preparation method of the aluminum alloy composite liquid cooling plate comprises the following steps:

[0163] (1) melting and casting the raw materials of the brazing layer in sequence to obtain an ingot;

[0164] (2) milling 9 mm from each of the two large surfaces of the ingot obtained in step (1), then heating for 7.5 h, heating to 515° C. and keeping the temperature for 5 h, and then hot rolling at 497° C., and naturally cooling to room temperature to obtain a brazing layer with a thickness of 94 mm;

[0165] (3) melting and casting the raw materials of the core layer in sequence to obtain an ingot;

[0166] (4) homogenizing the ingot obtained in step (3), and then milling 9.5 mm of each of the two large surfaces to obtain a core layer; wherein the holding temperature of the homogenization treatment is 565° C., the holding time is 12 h, the heating rate to the homogenization treatment holding temperature is 1.4° C. / min, and the cooling method is air cooling after the furnace is taken out;

[0167] (5) melting and casting the raw materials of the first barrier layer and the second barrier layer in sequence to obtain ingots;

[0168] (6) milling 11 mm from each of the two large surfaces of the ingot obtained in step (5), then heating for 9 h, heating to 525° C. and keeping the temperature for 7 h, and then hot rolling at 505° C., and naturally cooling to room temperature to obtain a first barrier layer with a thickness of 220 mm and a second barrier layer with a thickness of 126 mm;

[0169] (7) The brazing layer obtained in step (2), the first barrier layer obtained in step (6), the second barrier layer and the core layer obtained in step (4) are welded by argon arc welding, and then heated at 525°C for 16 hours, and then hot rolled and cold rolled in sequence, and then the waste edges are cut off by a rewinding trimmer, and then the oil stains and aluminum chips on the surface are cleaned by a bending and straightening cleaning machine, and the overall plate shape is optimized, and then annealed to O state by a nitrogen protection annealing furnace, and finally cut to the customer-specified size by a shearing machine and packaged for storage to obtain an aluminum alloy composite liquid cold plate; wherein the welding voltage is 26V and the current is 280A; the hot rolling temperature is 510°C, and the thickness of the hot rolled product is 7.0mm; the number of cold rolling passes is 5, and the deformation per pass is 40%; the annealing holding temperature is 350°C, the holding time is 2h, and the cooling method is furnace cooling.

[0170] Comparative Example 3

[0171] The aluminum alloy composite liquid cooling plate is composed of a brazing layer, a first barrier layer, a core layer and a second barrier layer stacked in sequence;

[0172] The brazing layer is a 4045 aluminum alloy having the following chemical compositions by mass percentage: Si 9.2%, Fe 0.27%, the rest ≤ 0.03% and the balance Al;

[0173] The chemical composition of the core layer is as follows by mass percentage: Si 1.2%, Mg 0.38%, Cu 0.28%, Fe 0.45%, Cr 0.03% and the balance Al;

[0174] The chemical compositions of the first barrier layer and the second barrier layer are: Si 1.1%, Mn 1.5%, Fe 0.55% and the balance Al in terms of mass percentage;

[0175] The thickness of the brazing layer is 5% of the total thickness of the aluminum alloy composite liquid cooling plate;

[0176] The thickness of the first barrier layer is 17% of the total thickness of the aluminum alloy composite liquid cooling plate;

[0177] The thickness of the second barrier layer is 10% of the total thickness of the aluminum alloy composite liquid cooling plate;

[0178] The thickness of the aluminum alloy composite liquid cooling plate is 2.0 mm;

[0179] The preparation method of the aluminum alloy composite liquid cooling plate comprises the following steps:

[0180] (1) melting and casting the raw materials of the brazing layer in sequence to obtain an ingot;

[0181] (2) milling 15 mm of each of the two large surfaces of the ingot obtained in step (1), then heating for 9 h, heating to 520° C. and keeping the temperature for 8 h, and then hot rolling at 500° C., and naturally cooling to room temperature to obtain a brazing layer with a thickness of 26 mm;

[0182] (3) melting and casting the raw materials of the core layer in sequence to obtain an ingot;

[0183] (4) homogenizing the ingot obtained in step (3), and then milling 15 mm of each of the two large surfaces to obtain a core layer; wherein the holding temperature of the homogenization treatment is 550° C., the holding time is 8 h, the heating rate to the homogenization treatment holding temperature is 1.0° C. / min, and the cooling method is air cooling after the furnace is taken out;

[0184] (5) melting and casting the raw materials of the first barrier layer and the second barrier layer in sequence to obtain ingots;

[0185] (6) milling 5 mm from each of the two large surfaces of the ingot obtained in step (5), then heating for 10 h, heating to 535° C. and keeping the temperature for 8 h, and then hot rolling at 515° C., and naturally cooling to room temperature to obtain a first barrier layer with a thickness of 88 mm and a second barrier layer with a thickness of 52 mm;

[0186] (7) The brazing layer obtained in step (2), the first barrier layer obtained in step (6), the second barrier layer and the core layer obtained in step (4) are welded by argon arc welding, and then heated at 535°C for 18 hours, and then hot rolled and cold rolled in sequence, and then the waste edges are cut off by a rewinding trimmer, and then the oil stains and aluminum chips on the surface are cleaned by a bending and straightening cleaning machine, and the overall plate shape is optimized, and then annealed to O state by a nitrogen protection annealing furnace, and finally cut to the size specified by the customer by a shearing machine and packaged for storage to obtain an aluminum alloy composite liquid cold plate; wherein the welding voltage is 29V and the current is 240A; the hot rolling temperature is 500°C, and the thickness of the hot rolled product is 6.3mm; the number of cold rolling passes is 5, and the deformation per pass is 20%; the annealing holding temperature is 300°C, the holding time is 2h, and the cooling method is furnace cooling.

[0187] Comparative Example 4

[0188] The aluminum alloy composite liquid cooling plate is composed of a brazing layer, a first barrier layer, a core layer and a second barrier layer stacked in sequence;

[0189] The brazing layer is a 4045 aluminum alloy having the following chemical compositions by mass percentage: Si 9.2%, Fe 0.27%, the rest ≤ 0.03% and the balance Al;

[0190] The chemical composition of the core layer is as follows by mass percentage: Si 1.05%, Mg 1.1%, Cu 0.105%, Fe 0.49%, Cr 0.05% and the balance Al;

[0191] The chemical compositions of the first barrier layer and the second barrier layer are: Si 1.1%, Mn 1.5%, Fe 0.55% and the balance Al in terms of mass percentage;

[0192] The thickness of the brazing layer is 8% of the total thickness of the aluminum alloy composite liquid cooling plate;

[0193] The thickness of the first barrier layer is 20% of the total thickness of the aluminum alloy composite liquid cooling plate;

[0194] The thickness of the second barrier layer is 14% of the total thickness of the aluminum alloy composite liquid cooling plate;

[0195] The thickness of the aluminum alloy composite liquid cooling plate is 1.6 mm;

[0196] The preparation method of the aluminum alloy composite liquid cooling plate comprises the following steps:

[0197] (1) melting and casting the raw materials of the brazing layer in sequence to obtain an ingot;

[0198] (2) milling 5 mm from each of the two large surfaces of the ingot obtained in step (1), then heating for 8.5 h, heating to 512° C. and keeping the temperature for 7 h, and then hot rolling at 480° C., and naturally cooling to room temperature to obtain a brazing layer with a thickness of 48 mm;

[0199] (3) melting and casting the raw materials of the core layer in sequence to obtain an ingot;

[0200] (4) homogenizing the ingot obtained in step (3), and then milling 14 mm of each of the two large surfaces to obtain a core layer; wherein the holding temperature of the homogenization treatment is 558° C., the holding time is 9 h, the heating rate to the homogenization treatment holding temperature is 1.2° C. / min, and the cooling method is air cooling after the furnace is taken out;

[0201] (5) melting and casting the raw materials of the first barrier layer and the second barrier layer in sequence to obtain an ingot;

[0202] (6) milling 12.5 mm from each of the two large surfaces of the ingot obtained in step (5), then heating for 8.5 h, heating to 527° C. and keeping the temperature for 6.5 h, and then hot rolling at 500° C., and naturally cooling to room temperature to obtain a first barrier layer with a thickness of 120 mm and a second barrier layer with a thickness of 84 mm;

[0203] (7) The brazing layer obtained in step (2), the first barrier layer obtained in step (6), the second barrier layer and the core layer obtained in step (4) are welded by argon arc welding, and then heated at 527°C for 14 hours, and then hot rolled and cold rolled in sequence, and then the waste edges are cut off by a rewinding trimmer, and then the oil stains and aluminum chips on the surface are cleaned by a bending and straightening cleaning machine, and the overall plate shape is optimized, and then annealed to O state by a nitrogen protection annealing furnace, and finally cut to the customer-specified size by a shearing machine and packaged for storage to obtain an aluminum alloy composite liquid cold plate; wherein the welding voltage is 24V and the current is 255A; the hot rolling temperature is 507°C, and the thickness of the hot rolled product is 6.1mm; the number of cold rolling passes is 5, and the deformation per pass is 28%; the annealing holding temperature is 320°C, the holding time is 2h, and the cooling method is furnace cooling.

[0204] The aluminum alloy composite liquid cooling plates prepared in Examples 1 to 2 and Comparative Examples 1 to 4 were subjected to strength tests using a micro-controlled universal testing machine E44.104 in accordance with GBT 16865-2013 “Specimens and methods for tensile testing of deformed aluminum, magnesium and their alloy products”. The results are shown in Table 1.

[0205] Table 1 Strength data of aluminum alloy composite liquid cooling plates prepared in Examples 1 to 2 and Comparative Examples 1 to 4

[0206]

[0207] As can be seen from Table 1, the present invention can make the aluminum alloy composite liquid cooling plate have excellent aging effect and excellent aging strength by controlling the thickness of the first barrier layer and the second barrier layer, the content of Si and Mn in the first barrier layer and the second barrier layer, and the content of Si, Mn and Cr in the core layer, and can be used for a long time; changing these parameters will lead to a significant reduction in the aging effect of the aluminum alloy composite liquid cooling plate, and long-term use will lead to deterioration of strength.

[0208] The diffusion content of Mg in the core layer of the aluminum alloy composite liquid cooling plates of Example 1 and Comparative Example 1 after brazing was measured, and the results are shown in Table 2.

[0209] Table 2 Diffusion content of Mg in the core layer of the aluminum alloy composite liquid cooling plate of Example 1 and Comparative Example 1 after brazing

[0210]

[0211] It can be seen from Table 2 that the aluminum alloy composite liquid cooling plate provided by the present invention can control the diffusion of Mg in the core layer.

[0212] The aluminum alloy composite liquid cooling plates prepared in Examples 1 to 2 and Comparative Examples 1 to 4 were tested for corrosion resistance after brazing. The results are shown in Table 3.

[0213] Table 3 Corrosion depth data of the second barrier layer of the aluminum alloy composite liquid cooling plate prepared in Examples 1 to 2 and Comparative Examples 1 to 4

[0214]

[0215] The corrosion depth diagram of the second barrier layer of the aluminum alloy composite liquid cooling plate prepared in Example 2 is as follows Figure 2 As shown; the corrosion depth diagram of the second barrier layer of the aluminum alloy composite liquid cooling plate prepared in Comparative Example 3 is as follows Figure 3 shown.

[0216] From Table 3, Figure 2 and Figure 3 It can be seen that the aluminum alloy composite liquid cooling plate provided by the present invention can have excellent corrosion resistance by controlling the thickness of the first barrier layer and the second barrier layer, the content of Si and Mn in the first barrier layer and the second barrier layer, and the content of Si, Mn and Cr in the core layer; changing these parameters will cause the corrosion resistance of the aluminum alloy composite liquid cooling plate to deteriorate.

[0217] It can be seen from the above embodiments and comparative examples that the aluminum alloy composite liquid cooling plate provided by the present invention has both high strength and excellent corrosion resistance.

[0218] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An aluminum alloy composite liquid cooling plate, comprising a brazing layer, a first barrier layer, a core layer and a second barrier layer stacked in sequence; The chemical composition of the core layer is expressed in mass percentage include: Si 0.5~1.0%, Mg 0.5~1.0%, Cu0.1~0.3%, Fe 0.2~0.5%, Cr≤0.1% and the balance Al; The chemical compositions of the first barrier layer and the second barrier layer independently include, by mass percentage, Si≤0.5%, Mn0.5-1.0%, Fe≤0.7% and the balance Al.

2. The aluminum alloy composite liquid cooling plate according to claim 1, It is characterized in that The brazing layer is 4045 aluminum alloy.

3. The aluminum alloy composite liquid cooling plate according to claim 1 or 2, It is characterized in that The thickness of the brazing layer is 5-15% of the total thickness of the aluminum alloy composite liquid cooling plate.

4. The aluminum alloy composite liquid cooling plate according to claim 1, It is characterized in that The chemical composition of the core layer includes, by mass percentage, 0.67-0.9% Si, 0.6-0.87% Mg, 0.15-0.25% Cu, 0.3-0.4% Fe, 0.01-0.08% Cr and the balance Al.

5. The aluminum alloy composite liquid cooling plate according to claim 1, It is characterized in that The chemical compositions of the first barrier layer and the second barrier layer independently include, by mass percentage, 0.1-0.5% Si, 0.6-0.85% Mn, ≤0.7% Fe and the balance Al.

6. The aluminum alloy composite liquid cooling plate according to claim 1 or 5, It is characterized in that The thickness of the first barrier layer is 15-25% of the total thickness of the aluminum alloy composite liquid cooling plate, and the thickness of the second barrier layer is 10-15% of the total thickness of the aluminum alloy composite liquid cooling plate.

7. The method for preparing the aluminum alloy composite liquid cooling plate according to any one of claims 1 to 6, The following steps are involved: (1) subjecting the raw material of the brazing layer to first smelting, first casting, first milling and first hot rolling in sequence to obtain the brazing layer; (2) subjecting the raw material of the core layer to a second smelting, a second casting, a homogenization treatment, and a second milling in sequence to obtain the core layer; (3) subjecting the raw materials of the first barrier layer and the second barrier layer to a third smelting, a third casting, a third milling and a second hot rolling, respectively, to obtain the first barrier layer and the second barrier layer; (4) the brazing layer obtained in step (1), the first barrier layer obtained in step (3), the core layer obtained in step (2) and the second barrier layer obtained in step (3) are sequentially composited, hot-rolled, cold-rolled and annealed to obtain an aluminum alloy composite liquid cooling plate; There is no order of precedence for steps (1) to (3).

8. The preparation method according to claim 7, It is characterized in that The temperature of the third hot rolling in step (4) is 500-520°C.

9. The preparation method according to claim 7, It is characterized in that The annealing temperature in step (4) is 300-380° C., and the annealing time is 1-3 hours.

10. Application of the aluminum alloy composite liquid cooling plate according to any one of claims 1 to 6 or the aluminum alloy composite liquid cooling plate prepared by the preparation method according to any one of claims 7 to 9 in the field of new energy vehicles.

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