Hot-pressed aluminum-copper busbar

Abstract

The utility model discloses hot -pressing aluminum copper row belongs to the technical field of metal material processing, and it includes: aluminum copper composite department, aluminum copper composite department has aluminum layer, copper layer and transition layer, the aluminum layer with copper layer is linked through transition layer, the volume ratio or the cross -sectional area ratio between copper layer with aluminum layer is 1:n, wherein, n=1-3. The aluminum copper composite department of hot -pressing aluminum copper row of being equipped with adopts aluminum copper composite structure, which not only retains the high conductivity of copper, easy weldability, but also utilizes the lightweight, low -cost advantage of aluminum, at the same time, also through transition layer solves the electrochemical corrosion and thermal stress problem brought by aluminum copper direct contact, thereby, can reduce the use of copper row structure to not. Therefore, the utility model discloses hot -pressing aluminum copper row solves the technical problem of how to improve the use efficiency of copper row.

Description

Technical Field

[0001] This utility model relates to the technical field of metal material processing, and in particular to a hot-pressed aluminum-copper busbar. Background Technology

[0002] Copper busbars are rectangular or rounded rectangular cross-section conductors made of high-purity copper, such as T2 material, with a copper content of over 99.9%. They are mainly used for high current transmission, power distribution, and grounding protection in electrical systems. Typically, they have excellent electrical conductivity, thermal conductivity, and mechanical strength.

[0003] Copper busbars are primarily used to provide efficient and stable current transmission and connection, and are widely used in power systems and electrical equipment. Their core uses include providing low-resistance conductive paths, facilitating wiring, carrying large currents, and ensuring system safety. Specific applications include: Power distribution systems: used as busbars and branch connections in high and low voltage distribution cabinets, facilitating wiring and carrying large currents. Compared to cables, they offer better heat dissipation performance, resistance to electro-stress characteristics, reduced skin effect losses, and improved maintenance efficiency; Electrical equipment connections: used as conductive components in switchgear, transformers, and busbar trunking to connect circuit breakers, disconnectors, and other components, enabling the distribution and transmission of electrical energy; New energy fields: used for high-voltage connections and insulation protection of battery packs, eliminating the risk of vibration and loosening, and ensuring stable current transmission, such as in automotive battery packs and new energy equipment; Lighting systems: used as conductive components in LED lamps and other equipment to support a stable current supply; Grounding and safety protection: used as grounding conductors, such as the neutral conductor N and the safety grounding conductor PE, connecting the neutral line or grounding system to improve electrical safety and reliability.

[0004] Based on this, Chinese patent document CN109217038A discloses a copper busbar and a copper busbar assembly. The copper busbar includes a plate-shaped conductive body, a connecting shaft connected to the conductive body, and a connecting shaft connection structure. The conductive body has a first side and a second side opposite to each other. Multiple terminals are spaced apart on the conductive body, and the multiple terminals are located between the first side and the second side. The connecting shaft is located at the first side and parallel to the first side, and the connecting shaft connection structure is located at the second side. Both the connecting shaft and the connecting shaft connection structure are made of conductive material. By setting the connecting shaft at the first side of the conductive body and the connecting shaft connection structure at the second side, multiple copper busbars can be connected through the connecting shaft and the connecting shaft connection structure. The conductive body is provided with terminals, and different numbers of copper busbars can be connected to connect different numbers of electrical devices. By connecting an appropriate number of copper busbars according to the size of the electrical control cabinet, it is convenient to arrange the copper busbars in the electrical control cabinet.

[0005] However, existing copper busbars still suffer from insufficient structural strength. Specifically, the price of pure copper busbars is more than three times that of aluminum busbars, significantly increasing equipment manufacturing and procurement costs, especially in budget-sensitive areas such as new energy or energy storage systems, where their cost disadvantage is obvious. Moreover, pure copper busbars have a high density, approximately three times that of aluminum of the same density, leading to increased transportation and installation difficulties, requiring more manpower and resources, indirectly increasing overall costs. Furthermore, pure copper busbars have lower hardness, resulting in insufficient structural strength in use. Utility Model Content

[0006] Therefore, it is necessary to provide a hot-pressed aluminum-copper busbar to address the technical issue of how to improve the efficiency of copper busbar use.

[0007] A hot-pressed aluminum-copper busbar includes: an aluminum-copper composite part having an aluminum layer, a copper layer and a transition layer; the aluminum layer and the copper layer are connected by the transition layer; the volume ratio or cross-sectional area ratio between the copper layer and the aluminum layer is 1:n, where n=1-3.

[0008] Furthermore, the surface roughness of the bonding surfaces between the aluminum layer and the transition layer, and between the transition layer and the copper layer, satisfies the following condition: Ra < 0.8 μm.

[0009] Furthermore, the aluminum layer and the copper layer have a sloped or stepped transition.

[0010] Furthermore, at the end of the aluminum-copper composite part, the aluminum layer and the copper layer are processed into a bevel or stepped shape at a preset angle.

[0011] Furthermore, the thickness of the transition layer ranges from 0.1mm to 0.2mm.

[0012] Furthermore, in a specific embodiment, a hot-pressed aluminum-copper busbar includes: an aluminum-copper composite part, a first extended straight copper busbar part, a first phase overlap part, a current transformer, a copper busbar section, and an insulator; the first extended straight copper busbar part is disposed on the lower side of the aluminum-copper composite part, and the first phase overlap part is disposed on the upper side of the aluminum-copper composite part; the current transformer is sleeved on the first phase overlap part, one end of the first phase overlap part is connected to the aluminum-copper composite part, and the other end of the first phase overlap part is connected to the copper busbar section; an insulator is disposed on the lower side of each end of the copper busbar section.

[0013] Furthermore, a circuit breaker is provided on the side of the aluminum-copper composite part, and the first extended straight copper busbar is electrically connected to the circuit breaker.

[0014] Furthermore, the circuit breaker is also provided with an extended bent copper busbar and a second extended straight copper busbar on its side; a second phase overlap and a third phase overlap are provided on the adjacent side of the first phase overlap.

[0015] Furthermore, the second phase overlap portion connects the extended bent copper busbar portion and the copper busbar busbar portion respectively; the third phase overlap portion is connected to the second extended straight copper busbar portion through another aluminum-copper composite portion, and one end of the third phase overlap portion is connected to the copper busbar busbar portion.

[0016] Furthermore, a current transformer is installed in both the second phase overlap portion and the third phase overlap portion.

[0017] In summary, the hot-pressed aluminum-copper busbar of this invention is provided with an aluminum-copper composite section, which has an aluminum layer, a copper layer, and a transition layer; the aluminum layer and the copper layer are connected by the transition layer; the volume ratio or cross-sectional area ratio between the copper layer and the aluminum layer is 1:n, where n=1-3. The aluminum-copper composite section of the hot-pressed aluminum-copper busbar of this invention adopts an aluminum-copper composite structure, which retains the high conductivity and easy weldability of copper while utilizing the lightweight and low-cost advantages of aluminum; at the same time, the transition layer solves the electrochemical corrosion and thermal stress problems caused by direct contact between aluminum and copper; thus, the usage cost of copper busbars and other structures can be reduced. Therefore, the hot-pressed aluminum-copper busbar of this invention solves the technical problem of how to improve the usage efficiency of copper busbars. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the cross-sectional structure of the hot-pressed aluminum-copper busbar of this utility model; Figure 2 This is a schematic diagram of another cross-section of the hot-pressed aluminum-copper busbar of this utility model; Figure 3 This is a schematic diagram of one embodiment of the hot-pressed aluminum-copper busbar of this utility model; Figure 4 This is a schematic diagram of the structure of a hot-pressed aluminum-copper busbar from another direction in one embodiment of the present invention. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0025] Please refer to the following: Figures 1 to 2 The present invention relates to a hot-pressed aluminum-copper busbar, comprising: an aluminum-copper composite part 1, wherein the aluminum-copper composite part 1 has an aluminum layer 101, a copper layer 102 and a transition layer 103; the aluminum layer 101 and the copper layer 102 are connected by the transition layer 103; the volume ratio or cross-sectional area ratio between the copper layer 102 and the aluminum layer 101 is 1:n, wherein n=1-3.

[0026] Specifically, in the hot-pressed aluminum-copper busbar of this utility model, the aluminum layer 101 in the aluminum-copper composite part 1 is one of the main conductors, thereby enabling the overall structure of the aluminum busbar to take advantage of the lightweight and cost advantages of aluminum; the aluminum layer 101 is usually made of high-purity electrical aluminum, such as 1050, 1060, 1070 or high-conductivity aluminum alloy, such as 6101-T6 or 6063-T6, etc.

[0027] Specifically, in the hot-pressed aluminum-copper busbar of this utility model, the copper layer 102 in the aluminum-copper composite part 1 serves as one of the main conductors, thereby enabling the aluminum busbar to utilize the high conductivity and easy solderability of copper as a whole. The copper layer 102 can typically be made of high-purity oxygen-free copper, such as C1020 or C1100, or tough copper, such as C1011.

[0028] Specifically, in the hot-pressed aluminum-copper busbar of this utility model, the transition layer 103 in the aluminum-copper composite part 1 is used to promote the diffusion and metallurgical bonding of aluminum and copper atoms at the interface, or to form an effective electrochemical corrosion barrier layer, or to alleviate the thermal stress caused by the huge difference in thermal expansion coefficients between aluminum and copper.

[0029] Therefore, the transition layer 103 can be made of pure nickel, which is the preferred option. Nickel can form good diffusion bonds with both aluminum and copper. The standard electrode potential of nickel is -0.25V, which is between -1.66V for aluminum and +0.34V for copper, effectively blocking galvanic corrosion formed by direct contact between aluminum and copper. Nickel has good ductility, which helps to alleviate thermal stress.

[0030] In addition, the transition layer 103 can also be a nickel-based alloy, such as Monel, Ni-Cu alloy; its properties are similar to pure nickel, but it is superior in some aspects of corrosion resistance.

[0031] Furthermore, the transition layer 103 can also be silver, because silver has excellent conductivity and can bond well with both copper and aluminum, and its potential is -0.8V, which is between that of copper and aluminum. However, it is expensive and has relatively low strength.

[0032] Furthermore, the transition layer 103 can also be zinc, which has the primary advantage of low cost and a potential of -0.76V, which is between that of aluminum and copper. However, it has a low melting point of only 419°C, a narrow hot-pressing process window, and its bonding strength and long-term reliability are generally not as good as those of nickel.

[0033] Furthermore, in the aforementioned aluminum-copper composite part 1 structural scheme, the bonding surfaces between the aluminum layer 101, the transition layer 103, and the copper layer 102 must undergo precision machining, such as milling and grinding, to ensure that the smoothness and flatness of each bonding surface can reach Ra<0.8μm, thereby ensuring close contact between each bonding surface and eliminating air gaps.

[0034] Furthermore, at the end of the aluminum-copper composite part 1, the aluminum layer 101 and the copper layer 102 can be designed as a beveled or stepped transition. That is, at the end of the aluminum-copper composite part 1, the aluminum layer 101 and the copper layer 102 are processed into bevels or steps at a preset angle. This increases the bonding area, effectively increasing it several times compared to a flat, straight joint, significantly reducing interface resistance and improving tensile strength. Moreover, it eliminates stress concentration because the smooth transition avoids sharp stress singularities at the end, greatly improving resistance to thermal fatigue and mechanical vibration. In addition, it facilitates subsequent connections, such as exposing pure aluminum and pure copper areas at the ends, making it convenient to use aluminum welding, copper welding, or bolt connections, avoiding the difficulties of welding dissimilar metals.

[0035] Furthermore, the cross-sectional area of ​​the aluminum-copper composite part 1 can be calculated based on the target current carrying capacity, such as 300A or 600A. Then, the cross-sectional area of ​​each layer is determined according to the ratio between the copper layer 102 and the aluminum layer 101. For example, the aluminum-copper volume ratio is commonly 1:1, 2:1 or 3:1. These ratios can be selected by balancing costs, such as the low cost of aluminum, weight, lightness, conductivity, and the advantages of copper, as well as heat dissipation requirements.

[0036] Furthermore, the thickness of the transition layer 103 ranges from 0.1mm to 0.2mm. If it is too thin, such as less than 0.05mm, it may form a discontinuous diffusion layer, affecting the blocking effect; if it is too thick, such as greater than 0.3mm, it will increase cost and resistance.

[0037] Furthermore, the performance of the aforementioned aluminum-copper composite part 1 can be further improved through surface treatment. For example, the aluminum side can be chromate conductively oxidized or coated with a special protective paint to achieve a balance between corrosion resistance and maintaining good contact. However, it should be noted that ordinary anodic oxide films are non-conductive and are only used in areas requiring insulation. Further, for the copper side, tin plating or silver plating is typically performed, which greatly improves oxidation resistance and solderability. Moreover, non-connected areas can be covered with insulating sleeves or coated with epoxy resin powder coatings to provide electrical insulation and mechanical protection.

[0038] Furthermore, a process for preparing the aforementioned aluminum-copper composite part 1 includes the following steps: raw material preparation → surface pretreatment → blank assembly → hot-press diffusion welding → post-weld treatment → inspection and packaging; it is based on the hot-press diffusion welding process, and the specific steps are as follows: Step 1: Raw material preparation Aluminum and copper sheets are precisely cut and leveled to size. Precisely cut the nickel foil or other transition layer material according to the interface dimensions; Step 2, Surface Pretreatment Degreasing: Thoroughly clean all mating surfaces with organic solvents such as acetone and alcohol to remove grease; Mechanical activation: Fine sandblasting, such as 200-mesh alumina sand or polishing with a stainless steel wire brush / sandpaper, is used to thoroughly remove the surface oxide layer, resulting in a freshly activated metal surface with a preset roughness, such as Ra 0.4-0.8μm; The key to step 2 is to proceed to the next step immediately after the operation to prevent re-oxidation; and to strictly prevent cross-contamination between aluminum and copper materials. Chemical cleaning: Aluminum: Immerse in 5-10% NaOH solution at 40-60°C for 1-2 minutes → rinse with water → immerse in 30% HNO3 solution at room temperature for brightening → rinse thoroughly with deionized water; Copper: Immerse in 10% H2SO4 solution at room temperature → rinse thoroughly with deionized water; Nickel: Activate by immersion in 10% HCl solution at room temperature → rinse thoroughly with deionized water; Drying: Immediately transfer to a vacuum drying oven or dry with high-purity, oil-free hot nitrogen gas; Step 3, Assembly Perform the work in a clean bench or a glove box filled with inert gas, stacking the plates in the following order: copper plate → nickel foil → aluminum plate; ensure that each layer is aligned and that the contact surfaces are free of any dust, fingerprints, or other contaminants; a special graphite clamp can be used to gently press and secure the plates. Step 4: Hot-press diffusion welding Equipment: Vacuum hot press furnace with hot pressing function, set vacuum degree ≤10⁻³Pa or equipped with high purity protective atmosphere, such as hot press with Ar or N2 purity ≥99.999%; Furnace loading: The billet is placed into a high-strength graphite mold. The mold ensures uniform pressure transmission and prevents workpiece oxidation. Process curve: Evacuate / fill with protective gas to bring the furnace cavity to a high vacuum or fill with protective gas to a slightly positive pressure; Heating and pressurization: Increase the temperature at a rate of 5-10℃ / min; When the temperature rises to 350-400℃, which is about 0.55-0.6 times the melting point of Al, an initial pressure of 5MPa is applied to compress the laminate; thereafter, the temperature is continued to rise to the target process temperature of 500℃-540℃, which is about 0.76-0.82 times the melting point of Al. Heat and pressure holding: Apply a pressure of 20-35 MPa at the target temperature; hold for 60-120 minutes; during this stage, aluminum and copper atoms diffuse into each other through the nickel layer, forming a metallurgical bond; Cooling: After the heat preservation is completed, under the pressure, slowly cool to below 300°C at a controlled rate of <5°C / min; thereafter, the pressure can be stopped, and the furnace can be cooled with the furnace or rapidly cooled to room temperature by gas filling; The entire cooling process must be maintained under vacuum or a protective atmosphere; Step 5, Post-weld treatment Shaping: The composite slab may have slight warping, which requires cold leveling; Machining: The final shape, bevels / steps, mounting holes, etc. are machined using CNC milling machines, wire cutting, etc. Surface treatment: Electroplating or chemical treatment of the aluminum and copper sides according to the aforementioned scheme; Cleaning and Packaging: Final ultrasonic cleaning, vacuum packaging to prevent oxidation.

[0039] For further information, please refer to [link / reference]. Figures 3-4 In another specific embodiment of the hot-pressed aluminum-copper busbar of this utility model, a hot-pressed aluminum-copper busbar includes: an aluminum-copper composite part 1, a first extended straight copper busbar part 2, a first phase overlap part 3, a current transformer 4, a copper busbar busbar part 5, and an insulator 6; the first extended straight copper busbar part 2 is disposed on the lower side of the aluminum-copper composite part 1, and the first phase overlap part 3 is disposed on the upper side of the aluminum-copper composite part 1; the current transformer 4 is sleeved on the first phase overlap part 3, one end of the first phase overlap part 3 is connected to the aluminum-copper composite part 1, and the other end of the first phase overlap part 3 is connected to the copper busbar busbar part 5; an insulator 6 is disposed on the lower side of each of the two ends of the copper busbar busbar part 5.

[0040] Furthermore, a circuit breaker 7 is provided on the side of the aluminum-copper composite part 1, and the first extended straight copper busbar part 2 is electrically connected to the circuit breaker 7; an extended bent copper busbar part 8 and a second extended straight copper busbar part 9 are also provided on the side of the circuit breaker 7; a second phase overlap part 10 and a third phase overlap part 11 are respectively provided on the adjacent side of the first phase overlap part 3; the second phase overlap part 10 connects the extended bent copper busbar part 8 and the copper busbar busbar part 5 respectively; the third phase overlap part 11 and the second extended straight copper busbar part 9 are connected through another aluminum-copper composite part 1, and one end of the third phase overlap part 11 is connected to the copper busbar busbar part 5; a current transformer 4 is sleeved in both the second phase overlap part 10 and the third phase overlap part 11.

[0041] Specifically, the hot-pressed aluminum-copper busbar described in this utility model is a composite conductive structure, which can be mainly applied to the transmission, distribution and control of large currents in power systems. Its core technical means lies in the use of an aluminum-copper composite structure, which retains the high conductivity and easy welding of copper, while taking advantage of the lightweight and low cost of aluminum. At the same time, it can also solve the problems of electrochemical corrosion and thermal stress caused by direct contact between aluminum and copper through a transition layer.

[0042] Specifically, the first extended straight copper busbar 2 is located below the aluminum-copper composite section, and one side of it is connected to the aluminum layer 101. It has an extended copper busbar length, which facilitates connection with downstream equipment, such as the circuit breaker 7, and provides more flexible wiring space.

[0043] Specifically, the first phase overlap 3 is located on the upper side of the aluminum-copper composite part, and one side of it is connected to the copper layer 102. It can be used to connect the aluminum-copper composite part 1 and the copper busbar part. It is usually made of copper, which is convenient for welding or bolt connection and ensures smooth current transmission. Of course, the first phase overlap 3 can also be made of aluminum-copper composite material.

[0044] Specifically, the three sets of current transformers 4 are respectively mounted on the first, second, and third phase overlap portions, which can monitor the current magnitude in real time and are used for power metering, protection control, or status monitoring.

[0045] Specifically, the copper busbar section 5 is used to connect the phase overlaps, and is usually a multi-phase, such as a centralized conductive structure in a three-phase system; it can collect and distribute current, and is the main conductive part of the system. The copper busbar section 5 can be a multi-layered structure, and each layer can be connected to the end of a first phase overlap 3, a second phase overlap 10, or a third phase overlap 11. Each pair of copper busbar sections 5 can be insulated from each other by the insulators 6 provided at both ends.

[0046] Specifically, the two insulators 6 are respectively installed at both ends of the lower side of the copper busbar section 5, which are used to provide mechanical support and electrical insulation to prevent short circuits to ground or phase-to-phase short circuits.

[0047] Specifically, the circuit breaker 7 is disposed on the side of the aluminum-copper composite part 1; it is electrically connected to the first extended straight copper busbar part 2, the extended bent copper busbar part 8 and the second extended straight copper busbar part 9 respectively; it can automatically cut off the circuit in case of overload or short circuit to protect the system safety.

[0048] More specifically, when the hot-pressed aluminum-copper busbar of this utility model is in operation, the external current enters the copper busbar bus section 5 from the power supply end, and conducts electricity through each overlapping part, aluminum-copper composite part and extension part; the current transformer monitors the current in real time, the circuit breaker cuts off the circuit in case of abnormality, and the insulator ensures the insulation safety of the system.

[0049] In summary, the hot-pressed aluminum-copper busbar of this invention is provided with an aluminum-copper composite part 1, which has an aluminum layer 101, a copper layer 102, and a transition layer 103. The aluminum layer 101 and the copper layer 102 are connected by the transition layer 103. The volume ratio or cross-sectional area ratio between the copper layer 102 and the aluminum layer 101 is 1:n, where n = 1-3. The aluminum-copper composite part 1 of the hot-pressed aluminum-copper busbar of this invention adopts an aluminum-copper composite structure, which retains the high conductivity and easy weldability of copper, while utilizing the advantages of aluminum's lightweight and low cost. At the same time, the transition layer solves the electrochemical corrosion and thermal stress problems caused by direct contact between aluminum and copper. Thus, the usage cost of copper busbars and other structures can be reduced. Therefore, the hot-pressed aluminum-copper busbar of this invention solves the technical problem of how to improve the usage efficiency of copper busbars.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A hot-pressed aluminum-copper busbar, characterized in that, It includes: An aluminum-copper composite part (1) has an aluminum layer (101), a copper layer (102), and a transition layer (103); the aluminum layer (101) and the copper layer (102) are connected by the transition layer (103); the volume ratio or cross-sectional area ratio between the copper layer (102) and the aluminum layer (101) is 1:n, where n=1-3.

2. The hot-pressed aluminum-copper busbar according to claim 1, characterized in that: The surface roughness of the bonding surfaces between the aluminum layer (101) and the transition layer (103) and between the transition layer (103) and the copper layer (102) satisfies: Ra < 0.8 μm.

3. The hot-pressed aluminum-copper busbar according to claim 1, characterized in that: The aluminum layer (101) and the copper layer (102) are transitioned by a slope or a step.

4. The hot-pressed aluminum-copper busbar according to claim 1, characterized in that: At the end of the aluminum-copper composite part (1), the aluminum layer (101) and the copper layer (102) are processed into a bevel or step shape at a preset angle.

5. The hot-pressed aluminum-copper busbar according to claim 1, characterized in that: The thickness of the transition layer (103) ranges from 0.1 mm to 0.2 mm.

6. The hot-pressed aluminum-copper busbar according to claim 1, characterized in that, The hot-pressed aluminum-copper busbar includes: an aluminum-copper composite part (1), a first extended straight copper busbar part (2), a first phase overlap part (3), a current transformer (4), a copper busbar busbar part (5), and an insulator (6); the first extended straight copper busbar part (2) is provided on the lower side of the aluminum-copper composite part (1), and the first phase overlap part (3) is provided on the upper side of the aluminum-copper composite part (1); the current transformer (4) is sleeved on the first phase overlap part (3), one end of the first phase overlap part (3) is connected to the aluminum-copper composite part (1), and the other end of the first phase overlap part (3) is connected to the copper busbar busbar part (5); an insulator (6) is provided on the lower side of each end of the copper busbar busbar part (5).

7. The hot-pressed aluminum-copper busbar according to claim 6, characterized in that: A circuit breaker (7) is provided on the side of the aluminum-copper composite part (1), and the first extended straight copper busbar part (2) is electrically connected to the circuit breaker (7).

8. The hot-pressed aluminum-copper busbar according to claim 7, characterized in that: The circuit breaker (7) is also provided with an extended bent copper busbar (8) and a second extended straight copper busbar (9) on its side; a second phase overlap (10) and a third phase overlap (11) are provided on the adjacent side of the first phase overlap (3).

9. The hot-pressed aluminum-copper busbar according to claim 8, characterized in that: The second phase overlap (10) connects the extended bent copper busbar (8) and the copper busbar busbar (5) respectively; the third phase overlap (11) is connected to the second extended straight copper busbar (9) through another aluminum-copper composite part (1), and one end of the third phase overlap (11) is connected to the copper busbar busbar (5).

10. The hot-pressed aluminum-copper busbar according to claim 9, characterized in that: A current transformer (4) is fitted into both the second phase overlap portion (10) and the third phase overlap portion (11).

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