Method for producing aluminum-nickel composite strip

Abstract

This application proposes a method for preparing aluminum-nickel composite strip, comprising: performing film removal and activation treatment on the surfaces of the aluminum strip and nickel strip to be composited, respectively, to form an activated surface for the aluminum strip and an activated surface for the nickel strip; feeding the aluminum strip into a continuous heating section to form a hot aluminum strip, and feeding the nickel strip along a room-temperature conveying path outside the continuous heating section to the entrance side of the composite rolling mill to form a room-temperature nickel strip, wherein the temperature of the room-temperature nickel strip before entering the roll gap is lower than that of the hot aluminum strip; covering the activated surface of the aluminum strip with the room-temperature nickel strip before entering the roll gap, and simultaneously feeding it into the roll gap for differential temperature composite rolling in a process environment with a hydrogen gas integral of less than 0.1%, thereby forming an aluminum-nickel composite strip. This application can reduce the hot exposure time of the activated surface of the aluminum strip, improve the composite stability of the aluminum-nickel interface, and reduce the safety control pressure brought by the high-hydrogen atmosphere process.

Description

Technical Field

[0001] This application relates to the field of metal composite strip technology, and in particular to a method for preparing an aluminum-nickel composite strip. Background Technology

[0002] Aluminum-nickel composite strips are typically formed by combining aluminum and nickel layers. They combine the good electrical and thermal conductivity and low density of aluminum with the corrosion resistance and weldability of nickel, making them suitable for applications such as battery tabs, busbars, conductive connectors, and conductive connection parts in new energy devices. For this type of composite strip, the interfacial bonding state between the aluminum and nickel layers directly affects the strip's peel strength, bending performance, electrical conductivity stability, and subsequent processing properties such as slitting, punching, and welding. Therefore, before lamination, the surfaces of the aluminum and nickel strips to be laminated typically require delamination, cleaning, or activation treatment to reduce the impact of oxide films, oil stains, and rolling residues on the interfacial bonding.

[0003] In existing rolling or hot-pressing processes for aluminum-nickel composite strips, hydrogen, hydrogen-containing reducing gases, or inert protective gases are commonly used to protect the surface to be laminated during heating and transport, thus reducing the risk of re-oxidation. However, these atmosphere-protected processes place high demands on equipment sealing, gas monitoring, and safety management, especially given the high risk of combustion and explosion in a hydrogen environment. If conventional heating and lamination methods are used while reducing hydrogen usage, the activated surfaces of the aluminum and nickel strips may still come into contact with the external atmosphere before entering the lamination mill roll gap, forming an oxide layer or adsorbing contaminants. This can lead to problems such as insufficient bonding, delamination, or cracking at the composite interface. Therefore, it is necessary to provide a method for preparing aluminum-nickel composite strips suitable for low-hydrogen process environments, which can reduce hydrogen dependence while maintaining the composite stability of the aluminum-nickel interface. Summary of the Invention

[0004] Therefore, it is necessary to propose a method for preparing aluminum-nickel composite strips to address the aforementioned technical problems.

[0005] A method for preparing an aluminum-nickel composite strip includes: The surfaces of the aluminum strip and the nickel strip to be laminated are subjected to film removal and activation treatments respectively to form activated surfaces of the aluminum strip and nickel strip. The aluminum strip with the activated surface is fed into the continuous heating section to form a hot aluminum strip. The nickel strip with the activated surface of the nickel strip is conveyed to the entrance side of the composite mill along a normal temperature conveying path arranged outside the continuous heating section, so that the nickel strip forms a normal temperature nickel strip. The temperature of the normal temperature nickel strip before entering the roll gap of the composite mill is lower than the temperature of the hot aluminum strip before entering the roll gap. The room-temperature nickel strip covers the activated surface of the hot aluminum strip before entering the roll gap of the composite rolling mill; In the continuous heating section, the bonding path where the room-temperature nickel strip covers the activated surface of the aluminum strip, and the entrance side of the composite rolling mill, all are in a process environment where the hydrogen gas integral is less than 0.1%, the hot aluminum strip and the room-temperature nickel strip, after being mutually covered, are simultaneously fed into the roll gap of the composite rolling mill for differential temperature composite rolling. Under the action of rolling pressure, the hot aluminum strip forms an interfacial plastic composite with the activated surface of the nickel strip to form an aluminum-nickel composite strip.

[0006] In at least one embodiment of this application, the continuous heating section has an aluminum strip inlet and an aluminum strip outlet, the ambient temperature conveying path is arranged around the outside of the continuous heating section, and merges with the hot aluminum strip conveying path between the aluminum strip outlet and the roll gap of the composite rolling mill; The ambient temperature conveying path includes a nickel strip unwinding section, a nickel strip tension adjustment section, and a nickel strip guiding section. The nickel strip guiding section guides the ambient temperature nickel strip to the activated surface of the hot aluminum strip.

[0007] In at least one embodiment of this application, the nickel strip inlet section includes an inlet roller group disposed near the aluminum strip outlet. The inlet roller group causes the room temperature nickel strip to be inclined to the activated surface of the aluminum strip, and causes the contact line between the room temperature nickel strip and the activated surface of the aluminum strip to extend along the width direction of the hot aluminum strip. The aluminum strip outlet includes a first heat insulation element, a second heat insulation element, and an outlet slit formed between the first heat insulation element and the second heat insulation element. The first heat insulation element is located on the side of the activated surface of the hot aluminum strip, and the second heat insulation element is located on the side of the hot aluminum strip away from the activated surface. Both the first heat insulation element and the second heat insulation element are connected to the outlet side of the continuous heating section. The second heat insulation member is used to support the hot aluminum strip output through the outlet slit. The first heat insulation member extends along the conveying direction of the hot aluminum strip to the upstream side of the contact line and separates the room temperature nickel strip from the activated surface of the aluminum strip before the contact line. The inlet roller group guides the room temperature nickel strip to the side of the first heat insulation member away from the hot aluminum strip, so that after the room temperature nickel strip passes the downstream end of the first heat insulation member, it covers the activated surface of the aluminum strip at the contact line. After the room-temperature nickel strip covers the activated surface of the aluminum strip, it enters the roll gap of the composite rolling mill together with the hot aluminum strip.

[0008] In at least one embodiment of this application, after the room temperature nickel strip covers the activated surface of the aluminum strip, it first passes through the pre-roll bonding assembly and then enters the roll gap of the composite rolling mill. The pre-lamination assembly includes an introductory lamination roller and a pressing lamination roller arranged sequentially along the strip conveying direction. The introductory lamination roller is used to stabilize the coverage position of the room temperature nickel strip relative to the activated surface of the aluminum strip. The pressing lamination roller is used to apply pre-lamination pressure to the hot aluminum strip and the room temperature nickel strip that cover each other, so that the interfacial air between the hot aluminum strip and the room temperature nickel strip is discharged along the width direction of the hot aluminum strip.

[0009] In at least one embodiment of this application, a short-range shielding cover is provided between the continuous heating section and the composite rolling mill, and the short-range shielding cover is disposed outside the bonding path of the room temperature nickel strip covering the activated surface of the aluminum strip; The short-range shield is provided with an exhaust port and side baffle structures located on both sides of the strip width direction. The exhaust port is connected to a negative pressure exhaust pipeline, and the side baffle structures are used to reduce the disturbance of external airflow entering the bonding path.

[0010] In at least one embodiment of this application, the temperature of the hot aluminum strip before entering the roll gap of the composite rolling mill is 160°C to 320°C, and the temperature of the room temperature nickel strip before entering the roll gap of the composite rolling mill is 15°C to 60°C. During the differential temperature composite rolling process, the deformation resistance of the hot aluminum strip is lower than that of the room temperature nickel strip. Under the action of rolling pressure, the hot aluminum strip fills into the micro-uneven area of ​​the activated surface of the nickel strip to form a micro-interlocking structure of the aluminum-nickel interface.

[0011] In at least one embodiment of this application, the aluminum strip has a first surface and a second surface, the first surface having a local area to be laminated extending along the length direction of the aluminum strip, the local area to be laminated being located in the middle region, the edge region or the offset region of the first surface; The nickel strip is laminated to a localized area on the first surface to be laminated, thereby forming a single-sided localized aluminum-nickel composite strip.

[0012] In at least one embodiment of this application, the film removal and activation treatment is concentrated on the local area to be composited, and a local aluminum strip activation surface is formed in the local area to be composited; On the first surface, a region located on both sides of the width direction of the local area to be composited forms a retained gloss surface. The local aluminum strip activation surface is roughened relative to the retained gloss surface, and the local aluminum strip activation surface includes a shallow concave textured area formed by a grinding brush or sanding belt to remove the film. The film removal and activation process uses a width-limiting grinding brush wheel, a width-limiting sanding belt, or a grinding assembly with a baffle positioning device to limit the grinding width, so that the width of the local aluminum strip activation surface covers the composite width of the nickel strip.

[0013] In at least one embodiment of this application, the continuous heating section includes a plurality of partitioned heating units distributed along the width direction of the aluminum strip, and at least one of the partitioned heating units is disposed corresponding to the local composite area; The partitioned heating unit corresponding to the local composite area performs concentrated heating on the aluminum strip area corresponding to the local composite area, so that the aluminum strip area corresponding to the local composite area has a higher plastic flow capacity than the retained smooth surface. The effective heating width of the partitioned heating unit covers the local composite area and is less than the total width of the aluminum strip.

[0014] In at least one embodiment of this application, before or after the film removal and activation process, the local area to be laminated is subjected to a local rolling process to form a thickness adjustment area extending along the length direction of the aluminum strip in the local area to be laminated. The thickness adjustment zone includes a central receiving zone for receiving the nickel strip and thickness transition zones located on both sides of the central receiving zone in the width direction. The nickel strip is composited in the central receiving zone, and the thickness transition zones connect the central receiving zone and the retained smooth surface to reduce the local thickness abrupt change in the width direction of the single-sided local aluminum-nickel composite strip.

[0015] The method for preparing the aluminum-nickel composite strip according to this embodiment will have at least the following beneficial effects: The above-mentioned method for preparing aluminum-nickel composite strip involves performing film removal and activation treatments on the surfaces of the aluminum and nickel strips to be composited, respectively, to form relatively clean activated surfaces for the aluminum and nickel strips. By heating the aluminum strip to form a hot aluminum strip and conveying the nickel strip along a room-temperature path outside the continuous heating section to form a room-temperature nickel strip, the aluminum strip exhibits good plastic flowability while maintaining relatively high deformation resistance. By covering the activated surface of the hot aluminum strip with the room-temperature nickel strip before entering the roll gap of the composite rolling mill, and performing differential temperature composite rolling in a process environment with a hydrogen gas integral of less than 0.1%, the direct exposure time of the activated aluminum strip surface in the hot state can be reduced. This allows the hot aluminum strip to plastically flow towards the microstructure of the nickel strip activated surface under rolling pressure, thereby improving the composite stability of the aluminum-nickel interface and reducing the safety control pressure brought by the high-hydrogen atmosphere process. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] in: Figure 1 This is a schematic diagram of the process flow for preparing aluminum-nickel composite strip in one embodiment of this application; Figure 2 This is a schematic diagram of the overall layout of the aluminum-nickel composite strip preparation apparatus in one embodiment of this application; Figure 3 This is a partial structural schematic diagram of the nickel strip introduction and pre-coating assembly before roller bonding in one embodiment of this application; Figure 4 This is a schematic diagram of the structure of a short-range shield and bonding path in one embodiment of this application; Figure 5 This is a schematic diagram of the partial composite position of a single-sided partial aluminum-nickel composite strip in one embodiment of this application; Figure 6 This is a schematic diagram of the structure of a partial membrane removal and activation treatment in one embodiment of this application; Figure 7 This is a schematic diagram of the arrangement of the partitioned heating unit in one embodiment of this application; Figure 8 This is a cross-sectional schematic diagram of a local thickness adjustment area in one embodiment of this application.

[0018] Explanation of main component symbols 100. Aluminum-nickel composite strip preparation apparatus; 110. Aluminum strip; 111. Surface of aluminum strip to be composited; 112. Activated surface of aluminum strip; 113. First surface; 114. Second surface; 120. Nickel strip; 121. Surface of nickel strip to be composited; 122. Activated surface of nickel strip; 130. Continuous heating section; 131. Aluminum strip inlet; 132. Aluminum strip outlet; 1321. First heat insulation component; 1322. Second heat insulation component; 1323. Outlet slit; 140. Hot aluminum strip; 151. Room temperature nickel strip; 160. Composite rolling mill; 161. Roll gap; 170. Aluminum-nickel composite strip; 210. Nickel strip unwinding section; 220. Nickel strip tension adjustment section; 230. Nickel strip inlet section; 231. Inlet roll group; 232 310. Contact line; 311. Pre-lamination assembly before roller; 312. Introducing lamination roller; 313. Pressing lamination roller; 314. Lamination path; 315. Interface air exhaust direction; 416. Short-range shielding cover; 417. Exhaust port; 418. Negative pressure exhaust pipeline; 419. Side guard structure; 510. Local area to be laminated; 511. Central area; 512. Edge area; 513. Offset area; 610. Local aluminum strip activation surface; 611. Retained glossy surface; 612. Shallow concave texture area; 710. Zoned heating unit; 711. Corresponding heating unit; 712. Non-corresponding heating unit; 713. Effective heating width; 810. Thickness adjustment area; 811. Central receiving area; 812. Thickness transition area. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] This application provides a method for preparing an aluminum-nickel composite strip. This method is applicable to continuous composite processing of aluminum strip 110 and nickel strip 120, and is particularly suitable for the continuous preparation of aluminum-nickel composite strip 170 where reduced dependence on high hydrogen atmosphere is required. Figure 1 and Figure 2 As shown, after surface treatment, aluminum strip 110 and nickel strip 120 are heated by continuous heating section 130 to form hot aluminum strip 140, and nickel strip 120 is conveyed along a normal temperature conveying path arranged outside continuous heating section 130 to form normal temperature nickel strip 151. Before entering the roll gap 161 of composite rolling mill 160, normal temperature nickel strip 151 covers the aluminum strip activation surface 112 of hot aluminum strip 140. Then, the two enter the roll gap 161 of composite rolling mill 160 simultaneously for differential temperature composite rolling to obtain aluminum-nickel composite strip 170.

[0021] The "differential temperature composite rolling" in this application refers to the following: aluminum strip 110 is heated to a temperature suitable for warm rolling composite in a continuous heating section 130, while nickel strip 120 is conveyed along the outside of the continuous heating section 130 and maintained at a temperature lower than that of the hot aluminum strip 140 before entering the roll gap 161. The two strips enter the composite rolling mill 160 for rolling composite under a temperature difference. This process does not mean that both aluminum strip 110 and nickel strip 120 are hot-rolled composite at high temperatures, nor does it mean that cold pressing composite is performed simply at room temperature.

[0022] In one specific embodiment, the aluminum strip 110 can be industrial pure aluminum strip, aluminum alloy strip, or other aluminum-based strip suitable for composite with the nickel strip 120; the nickel strip 120 can be pure nickel strip, nickel alloy strip, or other nickel-containing conductive composite layer material. For example, the aluminum strip 110 can be 1060 aluminum strip, and the nickel strip 120 can be N6 nickel strip. The above material specifications are only used to illustrate one possible implementation and should not be construed as limiting the materials of the aluminum strip 110 and the nickel strip 120.

[0023] S10: Perform film removal and activation treatment on the surface 111 of the aluminum strip 110 to be laminated and the surface 121 of the nickel strip 120 to be laminated, respectively, to form the aluminum strip activation surface 112 and the nickel strip activation surface 122.

[0024] Before lamination, the surfaces of aluminum strip 110 and nickel strip 120 typically contain natural oxide films, absorbed moisture, oil, rolling residues, or fine particles. These substances, when present between the aluminum strip 110 and nickel strip 120, hinder effective metal-to-metal contact at the interface. In particular, the alumina film on the surface of aluminum strip 110 is usually dense and stable; even a thin film can easily form a barrier layer at the rolling lamination interface, increasing the risk of localized non-bonding, peeling, or cracking in the subsequent lamination process. Therefore, this step involves first performing film removal and activation treatments on the surfaces 111 of aluminum strip 110 and 121 of nickel strip 120 to be lamination, respectively, to form activated surfaces 112 and 122 for the aluminum strip and nickel strip, respectively.

[0025] In one specific embodiment, the film removal and activation treatment can employ one or more combinations of abrasive brushing, belt sanding, roller brush cleaning, degreasing and cleaning, and wiping and drying. For the aluminum strip 110, the film removal and activation treatment removes the natural oxide film and surface deposits on the surface 111 to be laminated, forming an activated aluminum strip surface 112 with fine texture. For the nickel strip 120, the film removal and activation treatment removes oxides, oil, and surface contaminants from the surface 121 to be laminated, placing the activated nickel strip surface 122 in a state suitable for interfacial plastic lamination.

[0026] It should be noted that the film removal and activation treatment is not simply about pursuing a macroscopic uneven morphology, but rather about reducing the barriers on the surfaces to be laminated and creating a surface state that can participate in interfacial contact and micro-interlocking under rolling pressure. In other words, the activated surfaces 112 of the aluminum strip and 122 of the nickel strip may have micro-coarsening textures, but these micro-coarsening textures should not be interpreted as a macroscopic uneven structure that alters the overall flatness of the aluminum strip 110 or the nickel strip 120.

[0027] From the perspective of interfacial bonding mechanisms, aluminum-nickel composites are not simply achieved by two layers of materials macroscopically adhering to each other. Instead, a sufficient number of actual metal contact points need to be formed at the interface to be composited. The role of the de-film activation treatment is to reduce oxide films, oil stains, and adsorbed contaminants, allowing the two metal materials to directly approach and contact each other at more micro-areas during subsequent rolling. If the interface to be composited retains a continuous oxide film or contains contaminants, even with high rolling pressure, the oxide film and contaminants may simply be pressed between the two metal layers, making it difficult to form a stable interfacial plastic composite.

[0028] After the film removal and activation treatment, abrasive debris and surface residues can be removed by airflow purging, wiping roller cleaning, or drying. This cleaning process can be set after the film removal and activation treatment and before the continuous heating section 130 to reduce the possibility of abrasive debris being carried into the subsequent composite interface.

[0029] S20: The aluminum strip 110 with the aluminum strip activation surface 112 is fed into the continuous heating section 130, so that the aluminum strip 110 forms a hot aluminum strip 140.

[0030] like Figure 2 As shown, the continuous heating section 130 has an aluminum strip inlet 131 and an aluminum strip outlet 132. The aluminum strip 110 enters the continuous heating section 130 through the aluminum strip inlet 131 and is heated to a preset rolling temperature within the continuous heating section 130, and then exits through the aluminum strip outlet 132 to form a hot aluminum strip 140.

[0031] The aluminum strip 110 is heated in this application because it typically serves as a matrix or load-bearing layer in the aluminum-nickel composite strip 170. During the rolling composite process, it requires sufficient plastic flow to form a stable interfacial plastic composite with the nickel strip activation surface 122. After heating, the aluminum strip 110 exhibits reduced deformation resistance and enhanced plastic flow capability. Upon entering the roll gap 161 of the composite rolling mill 160, it is more likely to undergo localized flow into the microscopic uneven regions of the nickel strip activation surface 122 under rolling pressure.

[0032] From the perspective of metal crystal deformation, aluminum is a metal material with good plasticity. After the aluminum strip 110 is heated to the warm rolling temperature range, dislocation movement within it is easier to occur, and the crystal slip resistance is reduced, resulting in a decrease in flow stress and an increase in plastic deformation capacity. At this time, when the hot aluminum strip 140 is subjected to pressing within the roll gap 161, it can generate more sufficient local plastic flow near the interface, allowing the aluminum surface layer to fill the micro-uneven areas of the nickel strip activation surface 122 and expanding the actual contact area at the aluminum-nickel interface.

[0033] In one specific embodiment, the temperature of the hot aluminum strip 140 before entering the roll gap 161 of the composite rolling mill 160 can be between 160°C and 320°C. This temperature range is suitable for warm rolling composite, which can improve the plastic flowability of the aluminum strip 110, and avoid excessive softening, accelerated surface oxidation, or reduced dimensional stability of the aluminum strip 110 due to excessive temperature.

[0034] It should be further clarified that the purpose of "heating the aluminum strip 110" in this application is not merely to reduce the rolling load, but to make the aluminum strip 110 the main plastic flow side at the interface. After the temperature of the aluminum strip 110 is increased, its surface layer is more easily squeezed into the fine texture area of ​​the nickel strip activation surface 122 in the roll gap 161, so that the originally dispersed point contact gradually expands into a more continuous interfacial contact, thereby improving the composite stability.

[0035] If the aluminum strip 110 is kept at a low temperature while only the nickel strip 120 is heated, the aluminum strip 110 will still have high deformation resistance in the roll gap 161, making it difficult to fully fill the micro-uneven areas of the nickel strip activation surface 122. If both the aluminum strip 110 and the nickel strip 120 are heated, the nickel strip 120 will also soften, reducing the compression constraint effect of the nickel strip 120 on the hot aluminum strip 140. The two strips are more likely to deform synchronously, and the driving force for the hot aluminum strip 140 to partially fill the nickel strip activation surface 122 is weakened. Therefore, this application adopts a differential temperature configuration of heating the aluminum strip 110 and conveying the nickel strip 120 at room temperature, so that the aluminum strip 110 undertakes the main plastic flow function, while the nickel strip 120 undertakes the relatively rigid compression function.

[0036] S30: The nickel strip 120 with the nickel strip activation surface 122 is conveyed to the entrance side of the composite mill 160 along the ambient temperature conveying path arranged outside the continuous heating section 130, so that the nickel strip 120 forms an ambient temperature nickel strip 151.

[0037] like Figure 2 As shown, the ambient temperature conveying path is located outside the continuous heating section 130 and merges with the conveying path of the hot aluminum strip 140 between the aluminum strip outlet 132 and the roll gap 161 of the composite rolling mill 160. The ambient temperature conveying path includes a nickel strip unwinding section 210, a nickel strip tension adjusting section 220, and a nickel strip guiding section 230. After the nickel strip 120 is unwound by the nickel strip unwinding section 210, the conveying tension is adjusted by the nickel strip tension adjusting section 220, and then it is guided by the nickel strip guiding section 230 to the corresponding position of the aluminum strip activation surface 112 of the hot aluminum strip 140.

[0038] The ambient temperature conveying path is arranged outside the continuous heating section 130, which allows the nickel strip 120 to avoid the high-temperature environment of the continuous heating section 130. After the nickel strip 120 has undergone the film removal and activation treatment, if it is subjected to a high-temperature heating environment again, the activated surface 122 of the nickel strip may undergo surface oxidation or adsorption contamination again, weakening the interface state formed by the previous film removal and activation treatment. Especially in the low-hydrogen process environment, the activated surface 122 of the nickel strip lacks the protection of a high-hydrogen reducing atmosphere, and the risk of surface oxidation will increase if exposed to high temperature for a long time. Therefore, this application arranges the nickel strip 120 to be conveyed along the outside of the continuous heating section 130 to reduce the high-temperature exposure of the activated surface 122 of the nickel strip before entering the roll gap 161.

[0039] In one specific embodiment, the temperature of the ambient temperature nickel strip 151 before entering the roll gap 161 of the composite rolling mill 160 can be between 15°C and 60°C. This temperature range does not imply that the nickel strip 120 must be actively cooled, but rather that the nickel strip 120 maintains a lower temperature relative to the hot aluminum strip 140 during the ambient temperature conveying path. Since the temperature of the ambient temperature nickel strip 151 before entering the roll gap 161 is lower than that of the hot aluminum strip 140 before entering the roll gap 161, a differential temperature composite rolling state is formed between the two in the roll gap 161.

[0040] The room-temperature nickel strip 151 serves two purposes in this application. First, the room-temperature nickel strip 151 maintains high deformation resistance, enabling it to press and constrain the hot aluminum strip 140 within the roll gap 161, thus facilitating plastic flow of the hot aluminum strip 140 into the microscopic uneven regions of the nickel strip activation surface 122. Second, the room-temperature nickel strip 151 covers the aluminum strip activation surface 112 of the hot aluminum strip 140 before entering the roll gap 161, reducing the time the aluminum strip activation surface 112 is in direct contact with the external atmosphere at high temperatures, thereby reducing the likelihood of a continuous oxide barrier layer forming on the aluminum strip activation surface 112.

[0041] From the perspective of the interfacial micro-process, the nickel strip 120, kept at room temperature during transport, maintains a relatively stable surface and acts as a relatively rigid pressing side within the roll gap 161. The hot aluminum strip 140, acting as a plastic flow side, fills the fine texture of the activated surface 122 of the nickel strip under rolling pressure. This combination of hard and soft, cold and hot materials at the interface provides both flowable material and pressing constraints, which is beneficial for forming a plastic interfacial composite.

[0042] S40: The room temperature nickel strip 151 is covered by the activated surface 112 of the hot aluminum strip 140 before entering the roll gap 161 of the composite mill 160.

[0043] like Figure 3 As shown, the nickel strip inlet section 230 includes an inlet roller assembly 231 located near the aluminum strip outlet 132. The inlet roller assembly 231 causes the room-temperature nickel strip 151 to be inclinedly introduced onto the aluminum strip activation surface 112 of the hot aluminum strip 140, forming a contact line 232 extending along the width direction of the hot aluminum strip 140 between the room-temperature nickel strip 151 and the aluminum strip activation surface 112. The room-temperature nickel strip 151 gradually covers the aluminum strip activation surface 112 along the contact line 232, and then moves together with the hot aluminum strip 140 toward the roll gap 161 of the composite mill 160.

[0044] In one specific embodiment, the aluminum strip outlet 132 includes a first heat insulation member 1321, a second heat insulation member 1322, and an outlet slit 1323 formed between the first heat insulation member 1321 and the second heat insulation member 1322. The first heat insulation member 1321 is located on one side of the activated surface 112 of the hot aluminum strip 140, and the second heat insulation member 1322 is located on the side of the hot aluminum strip 140 away from the activated surface 112. Both the first heat insulation member 1321 and the second heat insulation member 1322 are connected to the outlet side of the continuous heating section 130. The hot aluminum strip 140 is output through the outlet slit 1323, and the second heat insulation member 1322 is used to support the hot aluminum strip 140, so that the hot aluminum strip 140 maintains a relatively stable conveying posture after being output from the continuous heating section 130.

[0045] The first heat insulation element 1321 extends along the conveying direction of the hot aluminum strip 140 to the upstream side of the contact line 232, forming a shielding area between itself and the activated surface 112 of the aluminum strip for output of the hot aluminum strip 140. The guide roller group 231 guides the room temperature nickel strip 151 to the side of the first heat insulation element 1321 away from the hot aluminum strip 140, so that after the room temperature nickel strip 151 passes the downstream end of the first heat insulation element 1321, it covers the activated surface 112 of the aluminum strip at the contact line 232. Thus, the activated surface 112 of the aluminum strip can be shielded by the first heat insulation element 1321 before reaching the contact line 232, reducing the length of the activated surface 112 of the aluminum strip directly exposed to the external atmosphere in a hot state.

[0046] It should be noted that if the room-temperature nickel strip 151 forms a long-distance contact with the hot aluminum strip 140 before the contact line 232, the heat from the hot aluminum strip 140 can easily be transferred to the room-temperature nickel strip 151 through the direct contact between the two strips. This causes the room-temperature nickel strip 151 to heat up before entering the roll gap 161 of the composite rolling mill 160, thereby weakening the role of the room-temperature nickel strip 151 as a relatively rigid pressing side. In this embodiment, the first heat insulation element 1321 separates the room-temperature nickel strip 151 from the aluminum strip activation surface 112 before the contact line 232, so that the room-temperature nickel strip 151 only contacts the aluminum strip activation surface 112 after passing the downstream end of the first heat insulation element 1321, thereby reducing the degree of premature heat transfer from the hot aluminum strip 140 to the room-temperature nickel strip 151.

[0047] In one specific embodiment, the first heat insulation element 1321 and the second heat insulation element 1322 can be made of mica composite material, ceramic fiber composite material, glass fiber reinforced heat insulation material, or a metal substrate with a low thermal conductivity and wear-resistant layer on the surface. Through the above-mentioned material or structural configuration, the heat transferred from the hot aluminum strip 140 to the adjacent guide structure via the aluminum strip outlet 132 can be reduced, and the outlet slit 1323 can provide short-range guidance for the hot aluminum strip 140, allowing the hot aluminum strip 140 to form a relatively stable bond with the room-temperature nickel strip 151 at the contact line 232.

[0048] The aluminum strip activation surface 112 of the hot aluminum strip 140, which covers the room-temperature nickel strip 151 before the roll gap 161, is a crucial step in maintaining the interface state under low-hydrogen process conditions. After the aluminum strip 110 is heated by the continuous heating section 130 to form the hot aluminum strip 140, the activation surface 112 of the aluminum strip is more likely to come into contact with oxygen, water vapor, or fine contaminants in the air compared to the room-temperature state. If the hot aluminum strip 140 is exposed for a long distance after exiting the aluminum strip outlet 132 and then enters the composite rolling mill 160 with the nickel strip 120, the risk of the aluminum strip activation surface 112 forming an oxide layer or adsorbing contaminants before entering the roll gap 161 increases.

[0049] This application uses a roller assembly 231 to cover the activated surface 112 of the hot aluminum strip 140 between the aluminum strip exit 132 and the roll gap 161 with a room-temperature nickel strip 151, thus mechanically shielding the activated surface 112 of the aluminum strip from the room-temperature nickel strip 151. This mechanical shielding differs from traditional atmosphere protection; it does not rely on high-hydrogen reducing gases to lower the oxygen potential, but rather reduces the exposure time of the activated surface of the hot aluminum strip 140, thereby decreasing the chance of a continuous oxide barrier layer forming on the activated surface.

[0050] In one specific embodiment, the guide roller group 231 may include a set of guide rollers arranged vertically opposite each other, or it may include a guide roller and a support roller. The room-temperature nickel strip 151 approaches the hot aluminum strip 140 at a preset guide angle under the action of the guide roller group 231. The guide angle can be adjusted according to the strip thickness, strip tension, the inlet position of the composite mill 160, and the running speed of the hot aluminum strip 140. If the guide angle is too large, the room-temperature nickel strip 151 is prone to local bending near the contact line 232; if the guide angle is too small, the coverage distance between the room-temperature nickel strip 151 and the activated surface 112 of the aluminum strip is too long. Therefore, in actual production, the position of the guide roller group 231 can be adjusted to ensure that the room-temperature nickel strip 151 smoothly covers the activated surface 112 of the aluminum strip.

[0051] like Figure 3 As shown, after the room-temperature nickel strip 151 covers the activated surface 112 of the aluminum strip, the two can first pass through the pre-roller pre-bonding assembly 310. The pre-roller pre-bonding assembly 310 includes an inlet bonding roller 311 and a pressing bonding roller 312 arranged perpendicular to the strip conveying direction. The inlet bonding roller 311 is used to stabilize the coverage position of the room-temperature nickel strip 151 relative to the activated surface 112 of the aluminum strip, and the pressing bonding roller 312 is used to apply pre-bonding pressure to the mutually covering hot aluminum strip 140 and room-temperature nickel strip 151, so that the interfacial air between them is discharged along the width direction of the hot aluminum strip 140, and the direction of interfacial air discharge is as follows. Figure 3 As shown in reference number 314.

[0052] The pre-bonding assembly 310 does not undertake the main task of rolling composite pressing; its function is to ensure that the hot aluminum strip 140 and the room-temperature nickel strip 151 form a stable bond before entering the composite mill 160. If air is trapped between the room-temperature nickel strip 151 and the hot aluminum strip 140, oxygen, water vapor, or fine dust in the air may be forced into the composite interface in the subsequent roll gap 161, forming local unbonded areas or weak interface areas. By pre-bonding and venting, the probability of trapped air entering the roll gap 161 can be reduced, allowing both to enter the composite mill 160 through a more stable bonding path 313.

[0053] S50: In the continuous heating section 130, the bonding path 313 of the room temperature nickel strip 151 covering the activated surface 112 of the aluminum strip, and the entrance side of the composite rolling mill 160 are all in a process environment where the hydrogen gas integral is less than 0.1%. The hot aluminum strip 140 and the room temperature nickel strip 151, which are mutually covered, are simultaneously fed into the roll gap 161 of the composite rolling mill 160 for differential temperature composite rolling. Under the action of rolling pressure, the hot aluminum strip 140 forms an interfacial plastic composite with the activated surface 122 of the nickel strip to form an aluminum-nickel composite strip 170.

[0054] In this application, a process environment with a hydrogen gas fraction of less than 0.1% refers to a low hydrogen content in the corresponding process areas of the continuous heating section 130, the bonding path 313, and the inlet side of the composite rolling mill 160. This process environment can be an air environment, a low-hydrogen environment after extraction treatment, or a production environment containing a low proportion of non-reducing gases. The limitation of a hydrogen gas fraction of less than 0.1% is used to characterize that the composite process of this application does not rely on a high-hydrogen reducing atmosphere to maintain the state of the surface to be composited.

[0055] The main function of a traditional high-hydrogen atmosphere is to reduce the oxygen potential in the process environment and decrease the re-oxidation of the metal surface during heating. Hydrogen itself is not a necessary component for the formation of a composite bond at the aluminum-nickel interface; its primary function is to provide atmospheric protection for the high-temperature metal surface. Unlike methods that rely on a high-hydrogen atmosphere, this application reduces the risk of interface oxidation and gas entrainment through process path control: on the one hand, the nickel strip 120 is kept away from the continuous heating section 130, reducing the chance of high-temperature re-oxidation of the nickel strip activation surface 122; on the other hand, the room-temperature nickel strip 151 covers the aluminum strip activation surface 112 of the hot aluminum strip 140 before entering the roll gap 161, shortening the hot exposure time of the aluminum strip activation surface 112; simultaneously, the interface air is discharged through the pre-lamination assembly 310 before the roll, reducing the possibility of oxygen, moisture, or dust being introduced into the composite interface.

[0056] like Figure 4 As shown, a short-range shielding cover 410 may be provided between the continuous heating section 130 and the composite rolling mill 160. The short-range shielding cover 410 is positioned outside the bonding path 313 where the room-temperature nickel strip 151 covers the activated surface 112 of the aluminum strip. The short-range shielding cover 410 is provided with an exhaust port 411, which is connected to a negative pressure exhaust pipe 412. Side baffle structures 413 are provided on both sides of the short-range shielding cover 410 in the strip width direction. The side baffle structures 413 are used to reduce the disturbance of external airflow entering the bonding path 313.

[0057] The short-range shield 410 is not used to form a high-hydrogen protective cavity, but rather to reduce airflow disturbance and the probability of dust entering around the bonding path 313. The exhaust port 411 and the negative pressure exhaust pipe 412 can exhaust hot air, abrasive dust, or volatile deposits around the bonding path 313 to the outside; the side baffle structure 413 can form airflow obstructions on both sides in the width direction of the strip, reducing the direct impact of external lateral airflow on the bonding area between the hot aluminum strip 140 and the room temperature nickel strip 151.

[0058] Further explanation from the microscopic mechanism of the interface reveals that the composite process between the aluminum strip 110 and the nickel strip 120 depends on the combined effects of metal contact at the interface, weakening of the surface barrier layer, localized plastic flow, and expansion of the actual contact area. The surfaces of the aluminum strip 110 and the nickel strip 120 to be composited naturally contain oxide films, adsorbed moisture, and contaminants. When these substances are located between the two metal layers, they hinder the formation of effective metal contact between aluminum and nickel atoms at the interface. Therefore, this application first employs a film removal and activation treatment to give the activated surfaces 112 of the aluminum strip and 122 of the nickel strip a cleaner surface state with finely textured roughening.

[0059] During differential temperature composite rolling, the hot aluminum strip 140 is at a higher temperature, resulting in enhanced dislocation mobility and reduced flow stress. Therefore, localized plastic flow is more likely to occur within the roll gap 161 of the composite mill 160. The room-temperature nickel strip 151, before entering the roll gap 161, has a lower temperature than the hot aluminum strip 140 and relatively higher deformation resistance, enabling it to form stable compression and interfacial constraints on the hot aluminum strip 140 within the roll gap 161. Consequently, under the rolling pressure of the composite mill 160, the hot aluminum strip 140 more easily fills the microscopic uneven regions of the nickel strip activation surface 122, gradually expanding the originally dispersed point contact into surface contact, and forming a microscopic interlocking structure and an interfacial plastic composite zone at the aluminum-nickel interface.

[0060] If the aluminum strip 110 and nickel strip 120 are heated simultaneously before entering the roll gap 161, the deformation resistance of the nickel strip 120 will decrease with increasing temperature, weakening the binding constraint of the nickel strip 120 on the hot aluminum strip 140, and making it easier for the two strips to deform synchronously. At this time, the local filling effect of the hot aluminum strip 140 into the microscopic uneven area of ​​the nickel strip activation surface 122 may decrease. Simultaneously, the nickel strip activation surface 122 of the nickel strip 120 is prone to re-adsorbing oxygen or forming oxides during high-temperature conveying, weakening the surface state formed by the film removal activation treatment. In contrast, this application conveys the nickel strip 120 along a room-temperature conveying path outside the continuous heating section 130, reducing the time the nickel strip activation surface 122 is exposed to high temperatures and allowing the room-temperature nickel strip 151 to maintain relatively high deformation resistance within the roll gap 161.

[0061] If only the nickel strip 120 is heated while the aluminum strip 110 remains at a lower temperature, the nickel strip 120 will deform more easily. However, the aluminum strip 110, being a typically thicker or more dominant substrate layer, lacks sufficient surface plastic flow capacity, making it difficult to fully fill the microscopic uneven areas of the activated surface 122 of the nickel strip. In this case, the interface tends to exhibit limited surface adhesion, hindering the formation of a sufficiently robust interfacial plastic composite. This application heats the aluminum strip 110, making the hot aluminum strip 140 the primary plastic flow side; and by conveying the nickel strip 120 at room temperature, the room-temperature nickel strip 151 becomes the relatively rigid pressing side. The two form a rigid-flexible fit within the roll gap 161, which is more conducive to increasing the actual contact area of ​​the aluminum-nickel interface.

[0062] It should also be noted that the low-hydrogen process environment described in this application does not mean that the surface to be composited will not undergo any oxidation at all, but rather that the probability of forming a continuous oxide barrier layer is reduced through multiple steps. Specifically, the film removal and activation treatment reduces the original oxide film and surface contaminants; the nickel strip 120 bypasses the continuous heating section 130 to reduce the high-temperature re-oxidation of the nickel strip activation surface 122; the room-temperature nickel strip 151 covers the aluminum strip activation surface 112 of the hot aluminum strip 140 in front of the roll gap 161, shortening the hot exposure time of the aluminum strip activation surface 112; the pre-bonding assembly 310 in front of the roll exhausts the interface air; and the short-range shielding cover 410 reduces airflow disturbance and dust entry. The above measures together enable the hot aluminum strip 140 and the room-temperature nickel strip 151 to enter the roll gap 161 in a relatively stable interface state and complete the differential temperature composite rolling.

[0063] In the aforementioned process, aluminum strip 110, acting as the primary plastic flow side, provides interface filling and expands the actual contact area; nickel strip 120, acting as the relatively rigid pressing side, provides interface constraint and covering shielding. The two are not simply stacked, but rather form an interfacial plastic composite under the combined effects of film removal activation, differential temperature deformation, pre-roll covering, pre-bonding venting, and rolling pressure. Therefore, the process advantage of this application lies not solely in reducing hydrogen content, but in establishing an aluminum-nickel interfacial bonding method suitable for continuous production through the heating of aluminum strip 110, room-temperature conveying of nickel strip 120, and pre-roll covering composite path under low-hydrogen conditions.

[0064] In one specific embodiment, the composite rolling mill 160 can be a two-high mill, a four-high mill, or other rolling equipment suitable for composite metal strips. The composite rolling reduction rate can be set according to the thickness of the aluminum strip 110, the thickness of the nickel strip 120, the target composite strength, and the product thickness. The composite aluminum-nickel composite strip 170 can be further subjected to stress-relief annealing, surface finishing, slitting, shearing, or coiling. The above post-processing steps can be selected according to the product application scenario and do not affect the core process logic of differential temperature composite rolling of aluminum strip 110 (heated) and nickel strip 120 (at room temperature) under low-hydrogen process environment in this application.

[0065] The following provides a further explanation of the single-sided partial composite implementation method.

[0066] like Figure 5 As shown, the aluminum strip 110 has a first surface 113 and a second surface 114. A localized composite region 510 extending along the length of the aluminum strip 110 is provided on the first surface 113. The localized composite region 510 can be located in the central region 511, the edge region 512, or the offset region 513 of the first surface 113. A nickel strip 120 is composited to the localized composite region 510 of the first surface 113 to form a single-sided localized aluminum-nickel composite strip 170.

[0067] In applications such as battery tabs, busbars, and conductive connectors, nickel strip 120 sometimes only needs to be applied to localized areas requiring high welding, connection, or corrosion resistance. If full-width grinding, heating, and lamination are still used, it will increase ineffective processing of non-lamination areas and may also affect the surface condition and dimensional stability of these areas. Therefore, this application further proposes a treatment method for the localized lamination area 510, matching the lamination location with localized film removal activation, localized heating, and thickness adjustment.

[0068] like Figure 6 As shown, in one specific embodiment, the film removal and activation process is concentrated on the local area to be laminated 510, forming a local aluminum strip activation surface 610 in the local area to be laminated 510. A retained smooth surface 611 is formed on the first surface 113 in the regions located on both sides of the width direction of the local area to be laminated 510. The local aluminum strip activation surface 610 is roughened relative to the retained smooth surface 611, and the local aluminum strip activation surface 610 includes a shallow concave textured region 612 formed by film removal by a brush or abrasive belt.

[0069] The "retained smooth surface" 611 refers to the area on the first surface 113 that has not undergone localized film removal and activation treatment or has only undergone light cleaning treatment. The "localized activated aluminum strip surface" 610 refers to the surface activated area formed after treatment by brushing, sanding, or other width-limiting film removal methods. The "shallow concave textured area" 612 is a micro-textured area formed on the surface of the aluminum strip 110 by brushing or sanding, and its function is to improve the surface activation degree of the localized composite area 510 and the actual contact area of ​​the interface. The "shallow concave textured area" 612 does not mean that the aluminum strip 110 as a whole has a macroscopic concave structure, but rather that the surface of the localized composite area 510 has formed a micro-coarsened texture.

[0070] In one specific embodiment, the film removal and activation process can be implemented using a grinding assembly. The grinding assembly includes a width-limiting grinding brush wheel and a stop-edge positioning device. The width-limiting grinding brush wheel is used to grind the localized area to be laminated 510, and the stop-edge positioning device is used to limit the position of the grinding assembly relative to the width direction of the aluminum strip 110, ensuring that the processing range of the width-limiting grinding brush wheel corresponds to the localized area to be laminated 510. The stop-edge positioning device reduces grinding position offset, preventing the localized activated surface 610 from being too narrow, causing the edge of the nickel strip 120 to cover the unactivated area, and also preventing the localized activated surface 610 from being too wide, causing the retained bright surface 611 to be over-processed.

[0071] In other embodiments, the width-limiting grinding brush wheel can be replaced with a width-limiting sanding belt, grinding roller, or other width-limiting surface treatment components. All of the above-mentioned width-limiting surface treatment components can form a localized activated aluminum strip surface 610 in the localized area to be laminated 510, and limit the processing width through a baffle positioning device. The width-limiting grinding brush wheel shown in the accompanying drawings represents only one possible implementation.

[0072] like Figure 7 As shown, the continuous heating section 130 may include a plurality of partitioned heating units 710 distributed along the width direction of the aluminum strip 110. At least one partitioned heating unit 710 is correspondingly disposed to a local area to be laminated 510, and this partitioned heating unit 710 may serve as a corresponding heating unit 711. Other heating units that do not correspond to the local area to be laminated 510 may serve as non-corresponding heating units 712. The effective heating width 713 of the corresponding heating unit 711 covers the local area to be laminated 510 and is less than the total width of the aluminum strip 110.

[0073] The partitioned heating unit 710 is designed to concentrate heat on the specific area of ​​the composite region 510 that is actually involved in the composite process. This allows the aluminum strip area corresponding to the composite region 510 to achieve higher plastic flow capacity than the area where the smooth surface 611 is retained, while the area where the smooth surface 611 is retained experiences relatively less thermal impact. Since the nickel strip 120 is only composited in the composite region 510, concentrating the thermoplastic enhancement in this localized area is more beneficial for improving the bonding stability of the local composite interface.

[0074] In one specific embodiment, the zoned heating unit 710 can be a zoned infrared heating unit, a zoned resistance heating unit, a zoned hot air heating unit, or a zoned induction heating unit. The operating power of the corresponding heating unit 711 can be higher than that of the non-corresponding heating unit 712, or only the corresponding heating unit 711 can be turned on for heating while the non-corresponding heating unit 712 maintains a lower power for heat preservation. In this way, the corresponding area of ​​the local area to be composited 510 can have a more suitable temperature state for plastic composite before entering the composite rolling mill 160.

[0075] It should be noted that zoned heating does not mean that the rest of the aluminum strip 110 is completely unheated, but rather that the corresponding area of ​​the local composite zone 510 receives stronger and more effective heating. In actual continuous production, there may be some heat conduction in the aluminum strip 110 within the continuous heating section 130, and the area where the smooth surface 611 is retained may also experience some temperature rise. However, as long as the area corresponding to the local composite zone 510 has a higher plastic flow capacity than the smooth surface 611, the technical objective of this embodiment can be satisfied.

[0076] like Figure 8 As shown, in one embodiment, the localized area to be laminated 510 may be subjected to localized rolling treatment before or after the film removal and activation treatment to form a thickness adjustment area 810 extending along the length direction of the aluminum strip 110 in the localized area to be laminated 510. The thickness adjustment area 810 includes a central receiving area 811 for receiving the nickel strip 120 and thickness transition areas 812 located on both sides of the width direction of the central receiving area 811. The nickel strip 120 is laminated to the central receiving area 811, and the thickness transition areas 812 connect the central receiving area 811 and the retained bright surface 611.

[0077] The single-sided partially aluminum-nickel composite strip 170 is prone to localized thickness abrupt changes in its structure. When the nickel strip 120 is only laminated to a localized area of ​​the aluminum strip 110, the thickness of the laminated area is greater than that of the non-laminated area. This can easily lead to sheet shape fluctuations, localized stress concentrations, or boundary warping during subsequent winding, slitting, shearing, or stamping. The thickness adjustment zone 810 serves to pre-form a central receiving area 811 for receiving the nickel strip 120 in the corresponding localized area of ​​the aluminum strip 110, and the thickness transition zone 812 ensures a smooth transition between the central receiving area 811 and the retained smooth surface 611, thereby reducing localized thickness abrupt changes in the width direction of the single-sided partially laminated strip.

[0078] In one specific embodiment, localized rolling processing can be achieved using localized rolling rolls, localized imprinting rolls, or localized thickness-fixing rolling devices. The width of the central receiving area 811 can be adapted to the composite width of the nickel strip 120, and the thickness transition area 812 can be located on both sides of the central receiving area 811, and can be in the form of a sloped surface, an arc surface, or a multi-level stepped transition shape. The above transition shapes can all be used to mitigate the thickness difference between the localized composite area and the retained smooth surface 611.

[0079] The thickness adjustment zone 810 and the local aluminum strip activation surface 610 can correspond to each other in the width direction. That is, the local aluminum strip activation surface 610 can be located on the upper surface of the central receiving zone 811. After the nickel strip 120 is laminated to this central receiving zone 811, the local aluminum strip activation surface 610 can be used to improve the interface bonding effect, and the thickness transition zone 812 can be used to improve the plate shape stability after local lamination. This structure is particularly suitable for products in which the nickel strip 120 is only set in a local area on one side of the aluminum strip 110.

[0080] The following section uses a set of specific process examples to illustrate the overall implementation process of this application.

[0081] In one specific embodiment, an aluminum strip 110 with a thickness of 0.2 mm to 1.0 mm and a nickel strip 120 with a thickness of 0.02 mm to 0.2 mm are provided. First, the surfaces 111 of the aluminum strip 110 and 121 of the nickel strip 120 to be laminated are subjected to a film removal and activation treatment, forming an aluminum strip activation surface 112 and a nickel strip activation surface 122, respectively. For single-sided partial lamination products, a width-limiting grinding brush wheel can be used to remove the film and activate only the partial lamination area 510 on the first surface 113, forming a partial aluminum strip activation surface 610 in the partial lamination area 510, while the remaining smooth surfaces 611 on both sides of the partial lamination area 510 maintain their original relatively flat surface state.

[0082] Subsequently, the aluminum strip 110 is fed into the continuous heating section 130, and heated to 160°C to 320°C according to the thickness, running speed, and composite strength requirements of the aluminum strip 110, forming a hot aluminum strip 140. Simultaneously, the nickel strip 120 is conveyed along a normal-temperature conveying path outside the continuous heating section 130, passing through the nickel strip unwinding section 210, the nickel strip tension adjustment section 220, and the nickel strip introduction section 230 to form a normal-temperature nickel strip 151. The temperature of the normal-temperature nickel strip 151 before entering the roll gap 161 of the composite rolling mill 160 is 15°C to 60°C, which is lower than the temperature of the hot aluminum strip 140 before entering the roll gap 161.

[0083] Subsequently, the room-temperature nickel strip 151 is introduced onto the activated surface 112 of the hot aluminum strip 140 via the guide roller group 231 in an inclined manner, and covers the activated surface 112 of the aluminum strip along the contact line 232. After mutual coverage, the hot aluminum strip 140 and the room-temperature nickel strip 151 are pre-bonded by the pre-bonding assembly 310 before the rollers, so that the interface air is discharged in the width direction. The bonding path 313 is set inside the short-range shield 410. The short-range shield 410 discharges the hot air and dust around the bonding path 313 through the exhaust port 411 and the negative pressure exhaust pipe 412, and reduces the external airflow disturbance through the side baffle structure 413.

[0084] Finally, the hot aluminum strip 140 and the room-temperature nickel strip 151, after being mutually covered, are simultaneously fed into the roll gap 161 of the composite rolling mill 160 for differential temperature composite rolling in a process environment where the hydrogen gas integral is less than 0.1%. During the rolling process, the hot aluminum strip 140 forms an interfacial plastic composite with the activated surface 122 of the nickel strip under the rolling pressure, resulting in an aluminum-nickel composite strip 170. For single-sided partial composite products, the nickel strip 120 is composited in the local composite area 510 of the first surface 113; for products with a thickness adjustment area 810, the nickel strip 120 is composited in the central receiving area 811, and the thickness transition areas 812 on both sides connect the central receiving area 811 and the retained smooth surface 611, thereby reducing local thickness abrupt changes.

[0085] In summary, this application achieves a relatively stable aluminum-nickel interface bonding state for the aluminum-nickel composite strip 170 during continuous production through the removal and activation of the aluminum strip 110 and continuous heating, the room-temperature conveying of the nickel strip 120, the pre-roll covering and bonding, the differential temperature composite rolling in a low-hydrogen environment, and the local removal of the film, zoned heating, and thickness adjustment zone 810 in the local composite scenario. In the above embodiments, the process parameters, strip specifications, heating methods, and local area arrangements can all be adjusted according to product specifications and production line conditions. As long as it enables the differential temperature composite rolling of the hot aluminum strip 140 and the room-temperature nickel strip 151 in a low-hydrogen process environment, it falls within the scope of this application.

[0086] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method of producing an aluminum-nickel composite strip, characterized by, include: The surfaces of the aluminum strip and the nickel strip to be laminated are subjected to film removal and activation treatments respectively to form activated surfaces of the aluminum strip and nickel strip. The aluminum strip with the activated surface is fed into the continuous heating section to form a hot aluminum strip. The nickel strip with the activated surface of the nickel strip is conveyed to the entrance side of the composite mill along a normal temperature conveying path arranged outside the continuous heating section, so that the nickel strip forms a normal temperature nickel strip. The temperature of the normal temperature nickel strip before entering the roll gap of the composite mill is lower than the temperature of the hot aluminum strip before entering the roll gap. The room-temperature nickel strip covers the activated surface of the hot aluminum strip before entering the roll gap of the composite rolling mill; In the continuous heating section, the bonding path where the room-temperature nickel strip covers the activated surface of the aluminum strip, and the entrance side of the composite rolling mill, all are in a process environment where the hydrogen gas integral is less than 0.1%, the hot aluminum strip and the room-temperature nickel strip, after being mutually covered, are simultaneously fed into the roll gap of the composite rolling mill for differential temperature composite rolling. Under the action of rolling pressure, the hot aluminum strip forms an interfacial plastic composite with the activated surface of the nickel strip to form an aluminum-nickel composite strip.

2. The method for preparing the aluminum-nickel composite strip according to claim 1, characterized in that: The continuous heating section has an aluminum strip inlet and an aluminum strip outlet. The ambient temperature conveying path is arranged around the outside of the continuous heating section and merges with the hot aluminum strip conveying path between the aluminum strip outlet and the roll gap of the composite rolling mill. The ambient temperature conveying path includes a nickel strip unwinding section, a nickel strip tension adjustment section, and a nickel strip guiding section. The nickel strip guiding section guides the ambient temperature nickel strip to the activated surface of the hot aluminum strip.

3. The method for preparing the aluminum-nickel composite strip according to claim 2, characterized in that: The nickel strip inlet section includes an inlet roller group located near the aluminum strip outlet. The inlet roller group causes the room temperature nickel strip to be inclined and placed against the activated surface of the aluminum strip, and causes the contact line between the room temperature nickel strip and the activated surface of the aluminum strip to extend along the width direction of the hot aluminum strip. The aluminum strip outlet includes a first heat insulation element, a second heat insulation element, and an outlet slit formed between the first heat insulation element and the second heat insulation element. The first heat insulation element is located on the side of the activated surface of the hot aluminum strip, and the second heat insulation element is located on the side of the hot aluminum strip away from the activated surface. Both the first heat insulation element and the second heat insulation element are connected to the outlet side of the continuous heating section. The second heat insulation member is used to support the hot aluminum strip output through the outlet slit. The first heat insulation member extends along the conveying direction of the hot aluminum strip to the upstream side of the contact line and separates the room temperature nickel strip from the activated surface of the aluminum strip before the contact line. The inlet roller group guides the room temperature nickel strip to the side of the first heat insulation member away from the hot aluminum strip, so that after the room temperature nickel strip passes the downstream end of the first heat insulation member, it covers the activated surface of the aluminum strip at the contact line. After the room-temperature nickel strip covers the activated surface of the aluminum strip, it enters the roll gap of the composite rolling mill together with the hot aluminum strip.

4. The method for preparing the aluminum-nickel composite strip according to claim 1, characterized in that: After the room temperature nickel strip covers the activated surface of the aluminum strip, it first passes through the pre-roll bonding assembly and then enters the roll gap of the composite rolling mill. The pre-lamination assembly includes an introductory lamination roller and a pressing lamination roller arranged sequentially along the strip conveying direction. The introductory lamination roller is used to stabilize the coverage position of the room temperature nickel strip relative to the activated surface of the aluminum strip. The pressing lamination roller is used to apply pre-lamination pressure to the hot aluminum strip and the room temperature nickel strip that cover each other, so that the interfacial air between the hot aluminum strip and the room temperature nickel strip is discharged along the width direction of the hot aluminum strip.

5. The method for preparing the aluminum-nickel composite strip according to claim 1, characterized in that: A short-range shielding cover is provided between the continuous heating section and the composite rolling mill. The short-range shielding cover is located outside the bonding path of the room temperature nickel strip covering the activated surface of the aluminum strip. The short-range shield is provided with an exhaust port and side baffle structures located on both sides of the strip width direction. The exhaust port is connected to a negative pressure exhaust pipeline, and the side baffle structures are used to reduce the disturbance of external airflow entering the bonding path.

6. The method for preparing the aluminum-nickel composite strip according to claim 1, characterized in that: The temperature of the hot aluminum strip before entering the roll gap of the composite rolling mill is 160°C to 320°C, and the temperature of the room temperature nickel strip before entering the roll gap of the composite rolling mill is 15°C to 60°C. During the differential temperature composite rolling process, the deformation resistance of the hot aluminum strip is lower than that of the room temperature nickel strip. Under the action of rolling pressure, the hot aluminum strip fills into the micro-uneven area of ​​the activated surface of the nickel strip to form a micro-interlocking structure of the aluminum-nickel interface.

7. The method for preparing the aluminum-nickel composite strip according to claim 1, characterized in that: The aluminum strip has a first surface and a second surface. The first surface has a local area to be laminated extending along the length direction of the aluminum strip. The local area to be laminated is located in the middle region, the edge region, or the offset region of the first surface. The nickel strip is laminated to a localized area on the first surface to be laminated, thereby forming a single-sided localized aluminum-nickel composite strip.

8. The method for preparing the aluminum-nickel composite strip according to claim 7, characterized in that: The film removal and activation treatment is concentrated on the local area to be composited, and a local aluminum strip activation surface is formed in the local area to be composited. On the first surface, a region located on both sides of the width direction of the local area to be composited forms a retained gloss surface. The local aluminum strip activation surface is roughened relative to the retained gloss surface, and the local aluminum strip activation surface includes a shallow concave textured area formed by a grinding brush or sanding belt to remove the film. The film removal and activation process uses a width-limiting grinding brush wheel, a width-limiting sanding belt, or a grinding assembly with a baffle positioning device to limit the grinding width, so that the width of the local aluminum strip activation surface covers the composite width of the nickel strip.

9. The method for preparing the aluminum-nickel composite strip according to claim 8, characterized in that: The continuous heating section includes multiple partitioned heating units distributed along the width direction of the aluminum strip, and at least one of the partitioned heating units is arranged corresponding to the local composite area; The partitioned heating unit corresponding to the local composite area performs concentrated heating on the aluminum strip area corresponding to the local composite area, so that the aluminum strip area corresponding to the local composite area has a higher plastic flow capacity than the retained smooth surface. The effective heating width of the partitioned heating unit covers the local composite area and is less than the total width of the aluminum strip.

10. The method for preparing the aluminum-nickel composite strip according to claim 8, characterized in that: Before or after the film removal and activation process, the local area to be laminated is subjected to local rolling process to form a thickness adjustment area extending along the length direction of the aluminum strip in the local area to be laminated. The thickness adjustment zone includes a central receiving zone for receiving the nickel strip and thickness transition zones located on both sides of the central receiving zone in the width direction. The nickel strip is composited in the central receiving zone, and the thickness transition zones connect the central receiving zone and the retained smooth surface to reduce the local thickness abrupt change in the width direction of the single-sided local aluminum-nickel composite strip.

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