Superconducting cable assembly and method of manufacturing the same

Abstract

This invention provides a superconducting cable assembly and its manufacturing method. The superconducting cable assembly includes a first superconducting cable, a second superconducting cable, and a connecting joint disposed between the first and second superconducting cables. The connecting joint includes a joint support member. The connecting joint connects the first and second superconducting cables. Multiple first strips of the first superconducting strip of the first superconducting cable and multiple second strips of the corresponding second superconducting strip of the second superconducting cable are staggered and stacked in the joint groove on the joint support member. The superconducting cable assembly manufactured by this method achieves surface contact between the superconducting strips instead of traditional point contact, realizing excellent performance of low resistance and high strength at the connection between the two superconducting cables, providing key technical support for the large-scale application of superconducting systems in fields such as nuclear fusion and smart grids.

Description

Technical Field

[0001] This invention belongs to the field of superconducting conductor technology, and specifically relates to a superconducting cable assembly and its preparation method. Background Technology

[0002] Compared to traditional conductors, superconducting conductors can achieve lower energy consumption and more compact systems because they can carry a greater current within the same cross-section. Therefore, superconducting materials have been applied to various power equipment and scientific devices, including small electronic products, power transmission lines, generators, motors, and high-field magnets. Superconductors are generally classified into low-temperature superconductors and high-temperature superconductors based on their critical temperature. Taking high-temperature superconductors as an example, in nuclear fusion devices, high-temperature superconducting conductors can carry currents of tens of kiloamperes through their compact cross-section, meeting the stringent requirements of tokamak magnet coils for strong magnetic fields and low cooling consumption. In the field of power transmission, high-temperature superconductors can achieve several times the current-carrying capacity with only 1 / 5 the volume of traditional cables, significantly reducing the difficulty and cost of deploying underground utility tunnels in urban power grids. They are the core carrier of future green energy transmission networks. The manufacturing length of a single superconducting cable is often no more than one kilometer. After the superconducting cable is laid, in order to make it a continuous line, it needs to be connected into a whole. The connection between two adjacent superconducting cables is the superconducting conductor joint.

[0003] It is important to note that the engineering application of superconducting transmission lines is highly dependent on the quality of the joints. The joints are the core nodes maintaining the current continuity of the superconducting system and must meet stringent requirements such as low resistance (below 5nΩ) and high mechanical strength under extreme operating conditions (e.g., decades of maintenance-free operation under 4.5K to 300K thermal cycling and electromagnetic cycling in nuclear fusion devices). Existing superconducting tape joints primarily connect the ends of two superconducting wires through a joint box. Joint boxes can be divided into arched and handshake types. Arched joint boxes are more suitable for high-current, large-space internal connections in superconducting magnets, while handshake joint boxes have a compact structure and simple manufacturing process. However, both arched and handshake joint boxes result in extremely uneven current distribution due to their asymmetrical structure. Specifically, using a joint box to connect two superconducting wires leads to a significant increase in AC losses at the connection point, increasing operating costs. Furthermore, the lower quench current of the superconducting transmission line limits overall performance; and poor mechanical stability and manufacturing consistency make it a potential weak point in the magnet. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problem that existing high-temperature superconducting tape joint technology cannot simultaneously reduce resistance and improve mechanical strength.

[0005] To address the aforementioned technical problems, embodiments of the present invention disclose a superconducting cable assembly, which includes a first superconducting cable, a second superconducting cable, and a connecting joint. The first superconducting cable includes a plurality of first superconducting strips; the second superconducting cable includes a plurality of second superconducting strips.

[0006] The connector is fixedly connected between one end of the first superconducting cable and one end of the second superconducting cable, and includes a connector support. The outer wall of the connector support has a plurality of connector grooves extending axially from one end of the connector support to the other end. A portion of each first superconducting strip passes through one end of a corresponding connector groove and extends into the connector groove, and a portion of each second superconducting strip passes through the other end of a corresponding connector groove and extends into the connector groove.

[0007] Furthermore, each connector groove has at least a portion of a region along its extension direction with stacked superconducting strips, the stacked superconducting strips comprising a first superconducting strip and a second superconducting strip stacked together, wherein a plurality of first strips of the first superconducting strip and a plurality of second strips of the corresponding second superconducting strip are staggered and fixedly connected.

[0008] Using the above technical solution, this superconducting cable assembly connects the first and second superconducting cables through a connector, ensuring the connection strength between the first and second superconducting cables. Furthermore, the connector groove formed on the outer wall of the connector support can fix and limit the first superconducting strip extending from the first superconducting cable and the second superconducting strip extending from the second superconducting cable, ensuring that the first and second superconducting strips can be connected and assembled in a predetermined position. Further, multiple first strips of the first superconducting strip and multiple second strips of the corresponding second superconducting strip are staggered and stacked within the connector groove, achieving surface contact between the superconducting strips instead of traditional point contact. This stacking structure can eliminate the interface oxidation problem of traditional welding processes, thereby reducing the contact resistance between the first and second superconducting strips. Moreover, the staggered stacking structure can achieve uniform current distribution.

[0009] Therefore, the superconducting cable assembly provided in this embodiment interleave multiple strips of the first superconducting strip in the first superconducting cable and multiple strips of the second superconducting strip in the second superconducting cable within the joint groove. While maintaining superconducting performance, it solves the technical difficulty of the traditional joint that "low resistance and high strength" cannot be achieved simultaneously, providing key technical support for the large-scale application of superconducting systems in fields such as nuclear fusion and smart grids.

[0010] Compared to the existing technology that connects two superconducting cables through a junction box, the superconducting cable assembly provided in this embodiment does not require stretching the superconductor inside the superconducting cable to the outside of the transmission line circumferentially to connect with the connection structure (such as a junction box) at the connection point of the two superconducting cables. This does not increase the space occupied by the superconducting cable assembly in the circumferential direction, which not only facilitates the arrangement of the continuous low-temperature cooling structure and insulation layer on the outer periphery of the superconducting cable assembly, but also benefits the arrangement of the superconducting cable assembly.

[0011] The present invention also discloses a superconducting cable assembly. The first superconducting cable further includes a first support member. The outer wall surface of the first support member is provided with a plurality of first grooves extending from the first end to the second end of the first support member in an axial direction. The plurality of first grooves correspond one-to-one with a plurality of first superconducting strips. Each first superconducting strip extends in an axial direction of the first support member, and a portion of each first superconducting strip extends out of the end of the first groove, while the other portion is disposed in the corresponding first groove. The second superconducting cable further includes a second support member. The outer wall surface of the second support member is provided with a plurality of second grooves extending from the first end to the second end of the second support member in an axial direction. The plurality of second grooves correspond one-to-one with a plurality of second superconducting strips. Each second superconducting strip extends in an axial direction of the second support member, and a portion of each second superconducting strip extends out of the end of the second groove, while the other portion is disposed in the corresponding second groove.

[0012] Multiple connector grooves are respectively provided in a one-to-one correspondence with multiple first grooves and multiple second grooves; one end of the connector support is fixedly connected to the end of the first support, and one end of each connector groove is connected to the end of the corresponding first groove; the other end of the connector support is fixedly connected to the end of the second support, and the other end of each connector groove is connected to the end of the corresponding second groove; the depth of the area in each connector groove where the stacked superconducting strip is provided is 2-2.5 times the depth of the first groove or the second groove.

[0013] By adopting the above technical solution, since multiple strips of the first superconducting strip and multiple strips of the second superconducting strip are staggered and stacked in the joint groove, the superconducting strips stacked in the joint groove are more than the superconducting strips stacked in the first or second groove. The depth of the area where the superconducting strips are stacked in the joint groove is set to 2-2.5 times the depth of the first or second groove, ensuring that the stacked superconducting strips can be completely embedded in the joint groove, preventing the superconducting strips from sliding or deforming during stacking.

[0014] An embodiment of the present invention also discloses a superconducting cable assembly, wherein the outer periphery of the stacked superconducting strips is further covered with a fixing strip.

[0015] By adopting the above technical solution, the fixing belt further fixes and limits the stacked superconducting belt in the joint groove, preventing the stacked superconducting belt from coming out of the joint groove.

[0016] The present invention also discloses a superconducting cable assembly, wherein the length of the connector support is 300mm-800mm, the material is copper, and each connector groove extends in the circumferential direction of the connector support in a spiral shape.

[0017] By employing the above technical solution and using a copper connector support, it is possible to ensure that the first and second superconducting cables have good resistance characteristics and heat dissipation performance at the connection point. Moreover, it ensures that the superconducting strip can be continuously wound around the outer periphery of the connector support in a spiral shape, eliminating the current congestion effect at traditional connectors (current is concentrated in some narrow areas in the conductor, resulting in increased current density in these areas. This increased current density leads to local resistance increases, which may cause hot spots and heat loss).

[0018] Therefore, this embodiment uses spiral grooves and copper-based support components to increase the contact area between the superconducting strips of the two superconducting cables. Combined with the high thermal conductivity of copper, the first and second superconducting cables have excellent characteristics of "low resistance and high strength - efficient heat dissipation" at the connection, laying a key structural foundation for the commercial application of superconducting power equipment.

[0019] Embodiments of the present invention also disclose a superconducting cable assembly, wherein each first groove extends in the circumferential direction of the first support member in a spiral manner; and each second groove extends in the circumferential direction of the second support member in a spiral manner.

[0020] The first superconducting cable also includes a first fastening layer and a first protective layer. The first fastening layer is disposed on the outer periphery of the first support member to press each first superconducting strip into the corresponding first groove. The first protective layer is disposed on the outer periphery of the first fastening layer.

[0021] The second superconducting cable also includes a second fastening layer and a second protective layer. The second fastening layer is disposed on the outer periphery of the second support member to press each second superconducting strip into the corresponding second groove, and the second protective layer is disposed on the outer periphery of the second fastening layer.

[0022] The connector also includes a connector fastening layer and a housing; the connector fastening layer covers the outer periphery of the connector support to press the first superconducting strip and the second superconducting strip into the corresponding connector groove, and the two ends of the connector fastening layer are respectively fixedly connected to the ends of the first fastening layer and the ends of the second fastening layer.

[0023] The shell covers the outer periphery of the connector fastening layer, and the two ends of the shell are fixedly connected to the ends of the first protective layer and the second protective layer, respectively; and the maximum outer diameter of the shell is consistent with the maximum outer diameter of the first superconducting cable and the second superconducting cable.

[0024] By employing the above technical solution, a first fastening layer, a second fastening layer, and a structural fastening layer located on the outer periphery of the first support member, and on the outer periphery of the joint support member, are mechanically pressed together to precisely fix the superconducting tape within the groove of the support member. This effectively reduces the risk of tape displacement, ensures tight contact between the superconducting tape and the bottom surface of the groove, reduces interfacial contact resistance, and improves the stability of superconducting current transmission. Furthermore, the joint fastening layer ensures that the first and second superconducting tapes maintain equivalent compression strength within the joint groove, eliminating the current concentration phenomenon caused by uneven fixing in traditional joints.

[0025] Furthermore, the first protective layer located on the outermost side of the first superconducting cable, the second retaining layer located on the outermost side of the second superconducting cable, and the outermost shell located on the outermost side of the connector support all protect the entire superconducting cable assembly, preventing foreign objects from damaging the superconducting strip and support components inside the superconducting cable assembly. Simultaneously, the maximum outer diameter of the shell is consistent with the maximum outer diameter of the first and second superconducting cables, resulting in a smooth and continuous outer surface of the superconducting cable assembly, which is particularly beneficial for its arrangement in confined spaces.

[0026] The present invention also discloses a superconducting cable assembly, wherein the first fastening layer, the second fastening layer and the joint fastening layer are made of stainless steel and have a thickness of 0.05mm-0.1mm.

[0027] One end of the shell and the end of the first protective layer are configured with a matching bevel structure, and the other end of the shell and the end of the second protective layer are configured with a matching bevel structure.

[0028] By employing the above technical solution, the stainless steel fastening layer provides high-strength compression force to the superconducting strip, ensuring its long-term fixation within the groove and preventing displacement due to vibration or thermal expansion and contraction. Simultaneously, the corrosion resistance of stainless steel protects against environmental erosion, extending the service life of the superconducting cable assembly.

[0029] Meanwhile, the ends of the two protective layers are matched with the corresponding ends of the shell using a bevel structure design. By increasing the contact area and optimizing the stress distribution, seamless welding or mechanical connection can be achieved. This structure can eliminate gaps at the connection, prevent the intrusion of external impurities, and reduce the risk of stress concentration caused by abrupt changes in diameter.

[0030] The present invention also discloses a method for preparing a superconducting cable assembly, wherein the superconducting cable assembly is the superconducting cable assembly described above, and the method includes:

[0031] S1: Obtain the first superconducting cable and the second superconducting cable;

[0032] S2: A portion of each first superconducting strip of the first superconducting cable passes through one end of the joint groove of the joint support and extends into the joint groove; a portion of each second superconducting strip of the second superconducting cable passes through the other end of the joint groove and extends into the joint groove; each first superconducting strip and the corresponding second superconducting strip are stacked in the corresponding joint groove to form a stacked superconducting strip, and the multiple first strips of the first superconducting strip and the multiple second strips of the second superconducting strip are staggered and fixedly connected.

[0033] Using the above technical solution, the first and second superconducting strips are staggered and fixed within the joint groove, achieving surface contact between the superconducting strips instead of point contact. This significantly increases the effective contact area and substantially reduces the contact resistance at the joint. Therefore, the superconducting cable assembly fabricated using this method achieves surface contact between the superconducting strips instead of traditional point contact, resulting in excellent performance of low resistance and high strength at the connection point of the two superconducting cables. This provides key technical support for the large-scale application of superconducting systems in fields such as nuclear fusion and smart grids.

[0034] The present invention also discloses a method for preparing a superconducting cable assembly. In step S2, the process of forming stacked superconducting strips further includes: uniformly applying solder paste with a thickness of 0.05mm-0.1mm between each first strip and the adjacent second strip; spirally winding metal wire or metal strip around the outer periphery of each stacked superconducting strip to form a fixing strip; heating the stacking position, and the heating temperature is less than 140℃-170℃.

[0035] Using the above technical solution, solder paste is uniformly applied between the first and second strips. Upon heating, the solder paste melts and penetrates into the microscopic irregularities on the strip surface, forming a dense intermetallic compound bonding layer. This process transforms the original "point contact" or "line contact" into "surface contact," thereby reducing the contact resistance between the first and second superconducting strips. Furthermore, as a highly thermally conductive medium, the solder paste forms heat conduction channels between the stacked strips, helping to rapidly dissipate localized heat to the support or the outside, preventing overheating of the first and second superconducting strips in the stacked area and thus avoiding superconducting failure.

[0036] The stacking of superconducting tapes by spirally winding metal wires or strips can provide uniform radial pressure to the stacked superconducting tapes, preventing misalignment or delamination of the tapes due to vibration or thermal stress during heating and curing or subsequent use.

[0037] Furthermore, the temperature at which the stacking location is heated is less than 140℃-170℃ to avoid damage to the superconducting properties of the superconducting tape due to high temperatures.

[0038] The present invention also discloses a method for preparing a superconducting cable assembly. The preparation method further includes step S1′, which is performed before step S2. Step S1′ includes: connecting one end of the connector support to the end of the first support in the first superconducting cable, wherein the ends of the plurality of first grooves on the first support and the ends of the plurality of connector grooves on the connector support are matched and connected one by one; connecting the other end of the connector support to the end of the second support in the second superconducting cable, wherein the ends of the plurality of second grooves on the second support and the other ends of the plurality of connector grooves on the connector support are matched and connected one by one; heating the connector support to a temperature of 110°C-150°C, and soldering the two joints together with solder.

[0039] Using the above technical solution, the first support component of the first superconducting cable and the second support component of the second superconducting cable are first connected by a connector support component. This not only ensures smooth assembly between the first and second support components, but also ensures that the connector groove is continuous with the corresponding first and second grooves. Furthermore, by heating the connector support component to 110℃-150℃ and soldering it, a high-strength connection between the support component and the first and second support components is achieved. The solder melts at a low temperature and fills the butt joint gap, forming a dense metallic bond, significantly enhancing the tensile and shear strength of the connection and preventing loosening due to vibration or thermal expansion and contraction.

[0040] Furthermore, the welding temperature of 110℃-150℃ is far below the critical temperature of superconducting tapes (typically higher than liquid nitrogen temperature of 77K), avoiding the damage of thermal stress to the superconducting state. At the same time, the solder, as a heat conduction medium, can quickly dissipate local heat in the joint area to the support or external cooling medium, preventing overheating from causing performance degradation of the superconducting material.

[0041] The present invention also discloses a method for preparing a superconducting cable assembly, the method further comprising:

[0042] S3: Use a fastening layer material strip to wrap around the outer periphery of the joint support to form a joint fastening layer, and fix the two ends of the joint fastening layer to the end of the first fastening layer of the first superconducting cable and the end of the second fastening layer of the second superconducting cable, respectively.

[0043] S4: Cover the outer periphery of the joint fastening layer with the two half-shells, fix the two half-shells after matching and mating, and apply a predetermined pressure until the outer diameter of the position where the two half-shells are set is consistent with the maximum outer diameter of the first superconducting cable; and make one end of the two half-shells and the end of the first protective layer beveled through a matching bevel structure, and the other end and the end of the second protective layer beveled through a matching bevel structure; perform multiple welding on the mating part and the connection part of the two half-shells, with each welding time less than 25-40s, and keep the temperature of the shell below 140℃-160℃.

[0044] By adopting the above technical solution, the fastening layer material strip is wrapped around the outer periphery of the joint support to form a multi-layer uniformly covered joint fastening layer. This can eliminate the gap or uneven overlap problem of single-layer winding, improve the uniformity of the joint fastening layer on the stacked superconducting strip, reduce the risk of strip displacement, and fix the ends of the joint fastening layer to the first and second fastening layers (such as by welding or pressing) to form an integrated fastening structure, avoiding mechanical stress concentration or superconducting strip detachment caused by loosening at the connection.

[0045] Two semi-shells are wrapped around the outer periphery of the joint fastening layer, and after mating and fixing the two semi-shells together, a shell is formed, protecting the joint support and stacked superconducting tape of the superconducting cable assembly. The symmetrical wrapping structure of the semi-shells and the applied pressure ensure uniform distribution of welding heat, reducing stress concentration or material deformation caused by local overheating. Furthermore, the bevel joint design at the ends of the semi-shells and the protective layer, through multiple welding processes, forms a dense metal barrier, effectively isolating harmful substances such as moisture and oxygen. During the welding process, each welding session is controlled within 25-40 seconds, and the shell temperature is kept below 140℃-160℃ to avoid thermal damage to the superconducting tape or the solidified solder layer.

[0046] The beneficial effects of this invention are as follows:

[0047] This invention discloses a superconducting cable assembly that connects a first superconducting cable and a second superconducting cable via a connector, ensuring the connection strength between the two cables. Furthermore, a connector groove formed on the outer wall of the connector support fixes and limits the extension of the first superconducting strip from the first cable and the extension of the second superconducting strip from the second cable, ensuring that the first and second superconducting strips are connected and assembled in a predetermined position. Further, multiple first strips of the first superconducting strip and multiple second strips of the corresponding second superconducting strip are staggered and layered within the connector groove. This solves the technical challenge of the incompatibility between "low resistance and high strength" at the connector in traditional transmission lines while maintaining superconducting performance, providing key technical support for the large-scale application of superconducting systems in fields such as nuclear fusion and smart grids. Attached Figure Description

[0048] Figure 1 An exploded structural diagram of a superconducting cable assembly is provided for Embodiment 1 of the present invention;

[0049] Figure 2 A schematic cross-sectional view of the first superconducting cable of the superconducting cable assembly is provided for Embodiment 1 of the present invention;

[0050] Figure 3 A cross-sectional schematic diagram of the area where the connection joint of the superconducting cable assembly is located is provided for Embodiment 1 of the present invention;

[0051] Figure 4 This is a partial schematic diagram of a method for providing a first superconducting strip of a first superconducting cable and a second superconducting strip of a second superconducting cable in a joint groove, according to Embodiment 1 of the present invention.

[0052] Figure 5 A flowchart of a method for preparing a superconducting cable assembly is provided for Embodiment 2 of the present invention;

[0053] Figure 6 Another flowchart provides a method for preparing a superconducting cable assembly according to Embodiment 2 of the present invention.

[0054] Explanation of reference numerals in the attached figures:

[0055] 10. Superconducting cable assembly;

[0056] 100. First superconducting cable; 110. First support member; 120. First superconducting tape; 121. First tape material; 130. First fastening layer; 140. First protective layer;

[0057] 200. Second superconducting cable; 210. Second support member; 220. Second superconducting strip; 221. Second strip material; 230. Second fastening layer; 240. Second protective layer;

[0058] 310. Connector support; 311. Connector groove; 320. Semi-shell. Detailed Implementation

[0059] As mentioned in the background section, existing superconducting tape joints primarily connect the ends of two superconducting wires using soldering. However, soldering weakens the mechanical strength of the joint, making it prone to damage and reducing the reliability of the superconductor. To improve the mechanical strength of the joint, a metal sleeve is sometimes used, but this method suffers from the problem of difficulty in reducing resistance.

[0060] To address this, the present invention provides a superconducting cable assembly, comprising a first superconducting cable, a second superconducting cable, and a connecting joint. The connecting joint is fixedly connected between one end of the first superconducting cable and one end of the second superconducting cable. The connecting joint includes a joint support member, which connects the first and second superconducting cables, ensuring the connection strength between the first and second support members. Furthermore, a joint groove is formed on the outer periphery of the joint support member, connecting the first and second grooves. Multiple strips of the first superconducting strip in the first superconducting cable and multiple strips of the second superconducting strip in the second superconducting cable are staggered and stacked in the joint groove. While maintaining superconducting performance, this invention solves the technical challenge of the traditional joint's inability to simultaneously achieve "low resistance and high strength," providing key technical support for the large-scale application of superconducting systems in fields such as nuclear fusion and smart grids.

[0061] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0062] Example 1:

[0063] This embodiment provides a superconducting cable assembly 10, which can be used for power transmission or nuclear fusion devices. This embodiment does not specifically limit this.

[0064] like Figure 1 As shown, this superconducting cable assembly 10 includes a first superconducting cable 100, a second superconducting cable 200, and a connector support 310 disposed between the first superconducting cable 100 and the second superconducting cable 200 to connect the first superconducting cable 100 and the second superconducting cable 200.

[0065] The specific structures of the first superconducting cable 100 and the second superconducting cable 200 are described below.

[0066] The first superconducting cable 100 includes a first support member 110 and a plurality of first superconducting strips 120. The outer wall surface of the first support member 110 is provided with a plurality of first grooves extending from the first end to the end of the first support member 110 in the axial direction. The plurality of first grooves correspond one-to-one with the plurality of first superconducting strips 120. Each first superconducting strip 120 extends in the axial direction of the first support member 110, and a portion of each first superconducting strip 120 along its extension direction is disposed in the corresponding first groove, and the other portion extends out of the end of the first groove.

[0067] The second superconducting cable 200 includes a second support member 210 and a plurality of second superconducting strips 220. The outer wall surface of the second support member 210 is provided with a plurality of second grooves extending from the first end to the last end of the second support member 210 in the axial direction. The plurality of second grooves correspond one-to-one with the plurality of second superconducting strips 220. Each second superconducting strip 220 extends in the axial direction of the second support member 210, and a portion of each second superconducting strip 220 is disposed in the corresponding second groove along its extension direction, while the other portion extends out of the end of the second groove.

[0068] It should be noted that the end of the first groove is located at the end of the first support member 110 (see...). Figure 1 (See the right end of the second groove), the end of the second groove is located at the end of the second support 210 (see the right end of the second groove). Figure 1 (Left end of the middle). Furthermore, the outer periphery of the first support member 110 of the first superconducting cable 100 may include two, three, four, or other numbers of first superconducting strips 120, and the outer periphery of the second support member 210 of the second superconducting cable 200 may include two, three, four, or other numbers of second superconducting strips 220. The first support member 110 and the second support member 210 may be made of materials with good thermal and electrical conductivity, such as copper or silver, while the first superconducting strips 120 and the second superconducting strips 220 may be materials such as yttrium barium copper oxide or bismuth-based materials. This embodiment does not specifically limit this, but the number of first superconducting strips 120 in the first superconducting cable 100 and the number of second superconducting strips 220 in the second superconducting cable 200 should be the same.

[0069] Furthermore, such as Figure 2 As shown, the first superconducting strip 120 can be formed by stacking multiple first strips 121 in the first groove. Similarly, the second superconducting strip 220 can also be formed by stacking multiple second strips 221 in the second groove. To prevent the multiple strips from loosening and detaching from the groove, a fixing strip or fixing wire can be wound around the outer periphery of the multiple stacked first strips 121. Likewise, a fixing strip or fixing wire can be wound around the outer periphery of the multiple stacked second strips 221. The fixing strip or fixing wire can be made of materials with good thermal and electrical conductivity, such as copper or silver. This embodiment does not limit this to a single material.

[0070] Furthermore, each first groove on the first support member 110 extends in a spiral shape in the circumferential direction of the first support member 110; each second groove on the second support member 210 extends in a spiral shape in the circumferential direction of the second support member 210. The spiral grooves can prevent additional stress concentration caused by misalignment of the stacked superconducting tapes, thus maximizing their electromechanical performance. Of course, each first groove on the first support member 110 can also extend in a straight line or in a wavy line, and the same applies to the second grooves; this embodiment does not limit this to a single feature.

[0071] It should be noted that the cross-sections of the first and second grooves can be rectangular or trapezoidal, and this embodiment does not limit this to a single shape.

[0072] Furthermore, to improve the assembly stability of the superconducting strips within the corresponding grooves, the first superconducting cable 100 further includes a first fastening layer 130, which is disposed on the outer periphery of the first support member 110 to press each first superconducting strip 120 into its corresponding first groove. The second superconducting cable 200 further includes a second fastening layer 230, which is disposed on the outer periphery of the second support member 210 to press each second superconducting strip 220 into its corresponding second groove.

[0073] In this embodiment, the first fastening layer 130 and the second fastening layer 230 disposed on the outer periphery of the first support member 110, through mechanical pressing, precisely fix the superconducting tape in the groove of the support member, effectively reducing the risk of tape displacement, ensuring close contact between the superconducting tape and the bottom surface of the groove, reducing interface contact resistance, and improving the stability of superconducting current transmission.

[0074] Specifically, the first fastening layer 130 and the second fastening layer 230 can be made of stainless steel. Using stainless steel for the fastening layers provides high-strength compression force to the superconducting strip, ensuring its long-term fixation within the groove and preventing displacement due to vibration or thermal expansion and contraction. Simultaneously, the corrosion resistance of stainless steel protects against environmental erosion, extending the service life of the superconducting cable assembly 10.

[0075] More specifically, in this embodiment, the thickness of the first fastening layer 130 and the second fastening layer 230 is 0.05mm-0.1mm. For example, the thickness can be 0.05mm, 0.06mm, 0.08mm, 0.1mm or other thicknesses within the above range. If the thickness of the fastening layer is less than 0.05mm, the strength of the fastening layer itself may be low, and it may not be able to effectively push the superconducting strip in the groove. If the thickness of the fastening layer is greater than 0.1mm, it may have an adverse effect on the heat dissipation performance of the superconducting strip in the superconducting cable.

[0076] Furthermore, the working environment of the superconducting cable assembly 10 is often harsh, such as being buried deep in damp soil or exposed at high altitudes. Therefore, the first superconducting cable 100 also includes a first protective layer 140, which is disposed on the outer periphery of the first fastening layer 130; the second superconducting cable 200 also includes a second protective layer 240, which is disposed on the outer periphery of the second fastening layer 230.

[0077] In this embodiment, the protective layer located outside the superconducting cable is often in direct contact with the external environment and needs to have high structural strength and stable chemical properties. It is usually made of stainless steel. However, the radial dimension of the protective layer is much larger than that of the fastening layer. For example, the thickness of the protective layer can be 5mm, 10mm or 15mm, etc., so as to prevent foreign objects from damaging the superconducting strip and support inside the superconducting cable assembly 10.

[0078] The structure of the connection between the first superconducting cable 100 and the second superconducting cable 200 is described in detail below.

[0079] The connector 300 includes a connector support 310, which connects the first support 110 and the second support 210. The structure of the connector support 310 is similar to that of the first support 110 and the second support 210. It can be made of materials such as copper or silver. One end of the connector support 310 is fixedly connected to the end of the first support 110, and the other end is fixedly connected to the second support 210. To ensure the connection strength between the connector support 310 and the first support 110 and the second support 210, the connector support 310 can be welded to the first support 110 and the second support 210. Of course, the welding temperature between the connector support 310 and the first support 110 and the second support 210 should not be too high to prevent adverse effects on the superconducting material wound around the periphery.

[0080] Specifically, the length of the connector support 310 is 300mm-800mm. For example, the length of the connector support 310 can be 300mm, 320mm, 350mm, 580mm, 800mm, or other lengths within the above range. Those skilled in the art can design it according to actual conditions and specific needs. It should be noted that if the length of the connector support 310 is shorter than 300mm or longer than 800mm, it may lead to assembly difficulties or decreased conductivity when the first superconducting cable 100 and the second superconducting cable 200 are connected through the connector support 310.

[0081] More specifically, the outer wall surface of the connector support 310 is provided with a plurality of connector grooves 311 extending axially from one end of the connector support 310 to the other end. Each connector groove 311 corresponds to a plurality of first grooves and a plurality of second grooves. One end of each connector groove 311 is aligned with the end of the corresponding first groove, and the other end is aligned with the end of the corresponding second groove. A portion of each first superconducting strip 120 passes through one end of its corresponding connector groove 311 and extends into that groove. Similarly, a portion of each second superconducting strip 220 passes through the other end of its corresponding connector groove 311 and extends into that groove. It should be noted that in embodiments where both the first and second grooves extend in a spiral shape, each connector groove 311 also extends circumferentially in a spiral shape within the connector support 310.

[0082] And, as Figure 3 and Figure 4 As shown, each joint groove 311 has stacked superconducting strips in at least a portion of its extending direction. The stacked superconducting strips include a first superconducting strip 120 and a second superconducting strip 220 stacked together. The plurality of first strips 121 of the first superconducting strip 120 and the plurality of second strips 221 of the corresponding second superconducting strip 220 are staggered and fixedly connected, realizing surface contact between the superconducting strips instead of traditional point contact. This stacked structure can eliminate the interface oxidation problem of traditional welding process, thereby reducing the contact resistance between the first superconducting strip 120 and the second superconducting strip 220. Furthermore, the staggered stacked structure can achieve uniform current shunting.

[0083] Therefore, the superconducting cable assembly 10 provided in this embodiment connects the first support member 110 of the first superconducting cable 100 and the second support member 210 of the second superconducting cable 200 through a connector support member 310. Furthermore, multiple strips of the first superconducting strip 120 in the first superconducting cable 100 and multiple strips of the second superconducting strip 220 in the second superconducting cable 200 are staggered and stacked in the connector groove 311. While maintaining superconducting performance, it solves the technical difficulty of the traditional connector's inability to achieve both "low resistance and high strength", providing key technical support for the large-scale application of superconducting systems in fields such as nuclear fusion and smart grids.

[0084] Compared to the existing technology that connects two superconducting cables through a junction box, the superconducting cable assembly 10 provided in this embodiment does not require the superconductor inside the superconducting cable to be stretched to the outside of the superconducting cable assembly 10 and connected to the connection structure (such as a junction box) at the connection point of the two superconducting cables. This does not increase the space occupied by the superconducting cable assembly 10 in the circumferential direction, which not only facilitates the arrangement of the continuous low-temperature cooling structure and insulation layer on the outer periphery of the superconducting cable assembly 10, but also benefits the arrangement of the superconducting cable assembly 10.

[0085] Furthermore, since the multiple strips of the first superconducting strip 120 and the multiple strips of the second superconducting strip 220 are staggered and stacked within the connector groove 311, the number of superconducting strips stacked within the connector groove 311 is greater than the number stacked in the first or second groove. Therefore, the depth of the area in the connector groove 311 where the superconducting strips are stacked is set to 2-2.5 times the depth of the first or second groove. This ensures that the stacked superconducting strips can be completely embedded within the connector groove 311, preventing slippage or deformation during stacking. The cross-section of the connector groove 311 can also be rectangular or trapezoidal. Those skilled in the art can design it according to the specific structure of the superconducting strip; this embodiment does not impose a unique limitation on this.

[0086] Furthermore, in this embodiment, the outer periphery of the stacked superconducting strips is also covered with a fixing strip. The fixing strip further fixes and limits the stacked superconducting strips within the connector groove 311, preventing the stacked superconducting strips from coming out of the connector groove 311. It should be noted that the fixing strip is similar to the fixing strips on the outer periphery of the first superconducting strip 120 and the second superconducting strip 220, and can be copper strip or copper wire commonly used in the art, or silver strip or silver wire, etc. This embodiment does not limit it to a single material.

[0087] It should be noted that, when the superconducting cable is provided with a fastening layer and a protective layer, the connector 300 also includes a connector fastening layer and a shell disposed on the outside of the connector support 310. The connector fastening layer covers the outer periphery of the connector support 310 to press the first superconducting strip 120 and the second superconducting strip 220 into the corresponding connector groove 311, ensuring that the first superconducting strip 120 and the second superconducting strip 220 maintain equivalent crimping strength in the connector groove 311, and eliminating the current concentration phenomenon caused by uneven fixing in traditional connectors.

[0088] Furthermore, the structure of the connector fastening layer is similar to that of the first fastening layer 130 and the second fastening layer 230. It can also be made of stainless steel, and the thickness of the connector fastening layer can be 0.05mm-0.1mm. The two ends of the connector fastening layer are fixedly connected to the ends of the first fastening layer 130 and the second fastening layer 230, respectively. The shell covers the outer periphery of the connector fastening layer, and the two ends of the shell are fixedly connected to the ends of the first protective layer 140 and the second protective layer 240, respectively. Furthermore, the maximum outer diameter of the shell is consistent with the maximum outer diameter of the first superconducting cable 100 and the second superconducting cable 200, so that the outer peripheral surface of the superconducting cable assembly 10 is continuous and smooth, which is especially beneficial for the arrangement of the superconducting cable assembly 10 in a narrow space.

[0089] It should be noted that the shell can be made of stainless steel and is formed by splicing two half-shells 320 together. The two half-shells 320 are joined together to form a cylindrical shell, which is convenient to be fitted onto the outer periphery of the joint fastening layer. The two half-shells 320 can be fixed by welding, as can the shell and the first protective layer 140 and the second protective layer 240. Similarly, during the welding process, the temperature should not be too high to prevent adverse effects on the superconducting material wrapped around the periphery.

[0090] Furthermore, one end of the shell and the end of the first protective layer 140 are configured with a matching bevel structure, and the other end of the shell and the end of the second protective layer 240 are configured with a matching bevel structure. By increasing the contact area and optimizing the stress distribution, seamless welding or mechanical connection can be achieved. This structure can eliminate gaps at the connection, prevent external impurities from entering, and reduce the risk of stress concentration caused by abrupt changes in diameter.

[0091] It should be noted that when this superconducting cable assembly 10 transmits power, taking the current flow from the first superconducting cable 100 to the second superconducting cable 200 as an example, the current is mainly transmitted from the first superconducting strip 120 of the first superconducting cable 100 to the second superconducting strip 220 of the second superconducting cable 200 through the stacked superconducting strips. Of course, during the transmission process, the current may also flow through other structures such as support members and fastening layers, which is not limited in this embodiment.

[0092] Example 2:

[0093] The present invention also discloses a method for preparing a superconducting cable assembly 10, wherein the superconducting cable assembly 10 is the superconducting cable assembly 10 of the first embodiment above, such as... Figure 5 As shown, this preparation method includes:

[0094] S1: Obtain the first superconducting cable 100 and the second superconducting cable 200; S2: Insert each first superconducting strip 120 of the first superconducting cable 100 through one end of the first groove into the corresponding connector groove 311, and insert each second superconducting strip 220 of the second superconducting cable 200 through the other end of the second groove into the corresponding connector groove 311; Each first superconducting strip 120 and the corresponding second superconducting strip 220 are stacked in the corresponding connector groove 311 to form a stacked superconducting strip, and the plurality of first strips 121 in the first superconducting strip 120 and the plurality of second strips 221 in the second superconducting strip 220 are staggered and fixedly connected.

[0095] Furthermore, before step S2, step S1′ is included: fixing one end of the connector support 310 to the end of the first support 110 in the first superconducting cable 100, wherein the ends of the plurality of first grooves on the first support 110 and one end of the plurality of connector grooves 311 on the connector support 310 are matched and connected one by one; fixing the other end of the connector support 310 to the end of the second support 210 in the second superconducting cable 200, wherein the ends of the plurality of second grooves on the second support 210 and the other end of the plurality of connector grooves 311 on the connector support 310 are matched and connected one by one.

[0096] In this manufacturing method, the first support member 110 of the first superconducting cable 100 and the second support member 210 of the second superconducting cable 200 are connected by a connector support member 310. This not only ensures smooth assembly between the first support member 110 and the second support member 210, but also ensures that the connector groove 311 is interconnected with the corresponding first and second grooves. This facilitates the smooth overlapping and fixing of the first superconducting strip 120 and the second superconducting strip 220 within the connector groove 311, achieving surface contact between the superconducting strips instead of point contact. This significantly increases the effective contact area and significantly reduces the contact resistance at the joint. Therefore, the superconducting cable assembly 10 manufactured by this method achieves surface contact between the superconducting strips instead of traditional point contact, realizing excellent performance of low resistance and high strength at the connection point of the two superconducting cables. This provides key technical support for the large-scale application of superconducting systems in fields such as nuclear fusion and smart grids.

[0097] It should be noted that in step S1, after obtaining the first superconducting cable 100 and the second superconducting cable 200, the outer periphery of the first superconducting cable 100 is often provided with a first fastening layer 130 and a first protective layer 140 covering the first support member 110 and multiple first superconducting strips 120. It is necessary to remove about 500 mm of the first protective layer 140 from the end of the first superconducting cable 100 to expose the first fastening layer 130. Multiple annular grooves can be machined axially at intervals along the outer periphery of the first protective layer 140 with a milling cutter, for example, three annular grooves, with a first protective layer 140 of about 0.1 mm thickness left at the bottom of the grooves to prevent the milling cutter from damaging the internal first fastening layer 130, first superconducting strips 120 and first support member 110. The first protective layer 140 that needs to be removed is then removed by mechanical breaking. After removing the first protective layer 140, the ends of the retained first protective layer 140 can be deburred and processed to form a bevel structure to facilitate subsequent assembly with the shell. Of course, those skilled in the art can design the length of the first superconducting cable 100 after removing the first protective layer 140 from the end according to actual conditions and specific needs, and this embodiment does not limit it to a single length.

[0098] Furthermore, the exposed first fastening layer 130 can be removed using diagonal pliers, and the ends of the remaining first fastening layer 130 can be deburred. At this time, the first superconducting strip 120 embedded in the first groove of the first support member 110 is exposed. It is necessary to remove the fixing strip wrapped around the outer periphery of each first superconducting strip 120 to facilitate the subsequent staggered stacking of the multiple first strips 121 of the first superconducting strip 120 and the multiple second strips 221 of the second superconducting strip 220.

[0099] Furthermore, since a first support member 110 still exists inside the exposed first superconducting strip 120, it will interfere with the assembly of the connector support member 310. Therefore, the exposed first support member 110 is removed using a cutting saw, and the remaining end of the first support member 110 is trimmed to maintain the flatness of the end and its perpendicularity to the axial direction. It should be noted that during the removal process, the exposed first superconducting strip 120 should be protected to prevent damage to the superconducting material. Specifically, a polyimide film can be placed between the multiple first superconducting strips 120 and the intermediate first support member 110, or a sleeve can be used to cover the first superconducting strip 120.

[0100] Since the structure of the second superconducting cable 200 is similar to that of the first superconducting cable 100, the same treatment can be applied to the second superconducting cable 200.

[0101] Further, in step S1′, one end of the connector support 310 is connected to the end of the first support 110, and the other end is connected to the end of the second support 210; the connector support 310 is heated to a temperature of 110℃-150℃, and the two joints are soldered together. Specifically, the connector support 310 can be heated to 110℃, 115℃, 120℃, 130℃, 150℃ or other temperatures within the above range by means of a hot air gun, heating wire, heating table or other equipment.

[0102] In this embodiment, a high-strength connection between the joint support 310 and the first support 110 and the second support 210 is achieved by heating the support member 310 to a temperature range of 110°C-150°C and then soldering it. The solder melts at a low temperature and fills the gap between the joints, forming a dense metallic bond, which significantly enhances the tensile and shear strength of the connection and prevents loosening of the connection due to vibration or thermal expansion and contraction.

[0103] Furthermore, the welding temperature of 110℃-150℃ is far below the critical temperature of superconducting tapes (typically higher than liquid nitrogen temperature of 77K), avoiding the damage of thermal stress to the superconducting state. At the same time, the solder, as a heat conduction medium, can quickly dissipate local heat in the joint area to the support or external cooling medium, preventing overheating from causing performance degradation of the superconducting material.

[0104] Of course, to prevent the superconducting material from being affected during the welding process, the superconducting tape can also be protected with alcohol or water. Gauze soaked in anhydrous alcohol can be wrapped around the outside of the superconducting tape to avoid damage to the performance of the superconducting tape caused by prolonged high-temperature heating during welding. At the same time, polyimide film or fiberglass cloth should be used as a barrier between the welding area and the superconducting tape to avoid accidental damage to the superconducting tape during the welding process.

[0105] Furthermore, in step S2, the process of forming stacked superconducting strips also includes: uniformly applying solder paste with a thickness of 0.05mm-0.1mm between each first strip 121 and the adjacent second strip 221. Specifically, the thickness of the solder paste can be 0.05mm, 0.07mm, 0.08mm, 0.1mm, or other thicknesses within the above range. After heating, the solder paste melts and penetrates into the microscopic unevenness of the strip surface, forming a dense intermetallic compound bonding layer. This process transforms the original "point contact" or "line contact" into "surface contact," thereby reducing the contact resistance between the first superconducting strip 120 and the second superconducting strip 220. In addition, the solder paste, as a high thermal conductivity medium, forms a heat conduction channel between the stacked strips, which helps to quickly diffuse local heat to the support or the outside, preventing the first superconducting strip 120 and the second superconducting strip 220 from overheating in the stacked area and causing superconducting failure.

[0106] A fixing band is formed by spirally winding metal wire or metal strip around the outer periphery of each stacked superconducting strip, which can provide uniform radial pressure to the stacked superconducting strip and prevent the strip from misaligning or delaminating due to vibration or thermal stress during heating and curing or subsequent use.

[0107] Heating the stacking area is necessary, with the heating temperature below 140℃-170℃ to avoid damaging the superconducting properties of the superconducting tape. For example, the heating temperature can be below 140℃, 150℃, or 170℃. When using heating tools such as hot air guns, soldering irons, or heating tables to weld the superconducting tape, thermocouples or infrared thermometers can be used for temperature monitoring to ensure that the temperature of the superconducting material does not exceed the predetermined value (e.g., 150℃) during the welding process. At the same time, some solder may be lost during the welding process. Solder wire or solder strip can be used to replenish the missing solder. Soldering rosin should also be used to reduce the impact of the oxide layer on the solder wetting.

[0108] After welding, wipe the welded conductor joint with alcohol or acetone. This removes residual rosin and other flux from the welding process and accelerates the cooling process of the stacked superconducting strips, preventing high temperatures from affecting the performance of the superconducting material. The welded joints of the stacked superconducting strips must be inspected. If any incomplete welds or insufficient solder filling are found, the welding must be repeated. Only after the welds are confirmed to be correct should subsequent processing proceed.

[0109] To better protect the joint support 310 and the stacked superconducting tape, such as Figure 6 As shown, this preparation method also includes:

[0110] S3: Use a fastening layer material strip to wrap around the outer periphery of the joint support 310 to form a joint fastening layer, and fix the two ends of the joint fastening layer to the end of the first fastening layer 130 of the first superconducting cable 100 and the end of the second fastening layer 230 of the second superconducting cable 200, respectively.

[0111] S4: The two half-shells 320 are wrapped around the outer periphery of the joint fastening layer, and the two half-shells 320 are matched and fixed after mating. A predetermined pressure is applied until the outer diameter of the position where the two half-shells 320 are set is consistent with the maximum outer diameter of the first superconducting cable 100. One end of each half-shell 320 is mated with the end of the first protective layer 140 through a matching bevel structure, and the other end is mated with the end of the second protective layer 240 through a matching bevel structure. The mating parts and the connection parts of the two half-shells 320 are welded multiple times, with each welding time less than 25-40 seconds, and the shell temperature is kept below 140℃-160℃. Specifically, each welding time can be less than 25 seconds, or less than 30 seconds, or less than 40 seconds; and the shell temperature can be below 140℃, or below 150℃, or below 160℃. Those skilled in the art can design according to actual conditions and specific needs, and this embodiment does not specifically limit this.

[0112] In this embodiment, by wrapping the fastening layer material strip around the outer periphery of the joint support 310, a multi-layer uniformly covered joint fastening layer is formed, thereby eliminating the gaps or uneven overlap of single-layer winding, improving the uniformity of the joint fastening layer on the stacked superconducting strip, reducing the risk of strip displacement, and the joint fastening layer is fixedly connected to the ends of the first and second fastening layers 230 (such as by welding or pressing) to form an integrated fastening structure, avoiding mechanical stress concentration or superconducting strip detachment caused by loosening at the connection.

[0113] Two semi-shells 320 are wrapped around the outer periphery of the joint fastening layer, and the two semi-shells 320 are matched and fixed to form a shell, which protects the joint support 310 and the stacked superconducting strip of the superconducting cable assembly 10. The symmetrical covering structure of the semi-shells 320 and the applied pressure ensure uniform distribution of welding heat and reduce stress concentration or material deformation caused by local overheating. In addition, the bevel joint design of the semi-shells 320 and the end of the protective layer forms a dense metal barrier through multiple welding, effectively isolating harmful substances such as moisture and oxygen. During the welding process, the welding time is controlled within 25-40 seconds, and the shell temperature is kept below 140℃-160℃ to avoid thermal damage to the superconducting strip or the solidified solder layer caused by high temperature.

[0114] In addition, when welding the two half-shells 320, water-soaked gauze can be used to wrap them, and copper cooling plates can be sandwiched on the top and bottom to cool the protective layer of other parts.

[0115] After welding is completed, non-destructive testing, radiographic testing, and helium leak detection are required to ensure that the mechanical strength and airtightness of the first superconducting cable 100 and the second superconducting cable 200 at the connection meet the requirements.

[0116] It should be noted that, in addition to the specific embodiments described above, those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a deep understanding of the invention, many specific details are included in the above description, and the invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0117] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0118] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in during use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0119] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0120] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0121] While the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the invention to these descriptions. Various changes in form and detail can be made by those skilled in the art, including several simple deductions or substitutions, without departing from the spirit and scope of the invention.

Claims

1. A superconducting cable assembly, characterized in that, include: The first superconducting cable includes multiple first superconducting strips; The second superconducting cable includes multiple second superconducting strips; A connector is fixedly connected between one end of the first superconducting cable and one end of the second superconducting cable, and includes a connector support. The outer wall of the connector support is provided with a plurality of connector grooves extending axially from one end of the connector support to the other end. A portion of each first superconducting strip passes through one end of the corresponding connector groove and extends into the connector groove, and a portion of each second superconducting strip passes through the other end of the corresponding connector groove and extends into the connector groove. Furthermore, each of the connector grooves has at least a portion of a region along its extension direction with stacked superconducting strips, the stacked superconducting strips comprising a first superconducting strip and a second superconducting strip stacked together, wherein a plurality of first strips of the first superconducting strip and a plurality of second strips of the corresponding second superconducting strip are staggered and fixedly connected.

2. The superconducting cable assembly as described in claim 1, characterized in that, The first superconducting cable further includes a first support member, the outer wall surface of which is provided with a plurality of first grooves extending from the first end to the end of the first support member in the axial direction, the plurality of first grooves corresponding one-to-one with a plurality of first superconducting strips; each first superconducting strip extends in the axial direction of the first support member, and a portion of each first superconducting strip extends out of the end of the first groove, and the other portion is disposed in the corresponding first groove. The second superconducting cable further includes a second support member, the outer wall of which is provided with a plurality of second grooves extending from the first end to the last end of the second support member in the axial direction, the plurality of second grooves corresponding one-to-one with a plurality of second superconducting strips; each second superconducting strip extends in the axial direction of the second support member, and a portion of each second superconducting strip extends out of the end of the second groove, while the other portion is disposed in the corresponding second groove; The plurality of connector grooves are respectively provided in a one-to-one correspondence with the plurality of first grooves and the plurality of second grooves; one end of the connector support is fixedly connected to the end of the first support, and one end of each connector groove is connected to the end of the corresponding first groove; the other end of the connector support is fixedly connected to the end of the second support, and the other end of each connector groove is connected to the end of the corresponding second groove. The depth of the region in each of the connector grooves where the stacked superconducting strips are disposed is 2 to 2.5 times the depth of the first groove or the second groove.

3. The superconducting cable assembly as described in claim 1, characterized in that, The outer periphery of the stacked superconducting strips is also covered with a fixing strip.

4. The superconducting cable assembly as described in claim 1, characterized in that, The length of the connector support is 300mm-800mm, the material is copper, and each of the connector grooves extends circumferentially in a spiral shape.

5. The superconducting cable assembly as described in claim 2, characterized in that, Each of the first grooves also extends circumferentially in the first support member in a spiral manner; each of the second grooves also extends circumferentially in the second support member in a spiral manner. The first superconducting cable further includes a first fastening layer and a first protective layer. The first fastening layer is disposed on the outer periphery of the first support member to press each of the first superconducting strips into the corresponding first groove. The first protective layer is disposed on the outer periphery of the first fastening layer. The second superconducting cable further includes a second fastening layer and a second protective layer. The second fastening layer is disposed on the outer periphery of the second support member to press each of the second superconducting strips into the corresponding second groove. The second protective layer is disposed on the outer periphery of the second fastening layer. The connector further includes a connector fastening layer and a housing; the connector fastening layer covers the outer periphery of the connector support to press the first superconducting strip and the second superconducting strip into the corresponding connector groove, and the two ends of the connector fastening layer are respectively fixedly connected to the end of the first fastening layer and the end of the second fastening layer. The housing covers the outer periphery of the connector fastening layer, and the two ends of the housing are fixedly connected to the ends of the first protective layer and the second protective layer, respectively; and the maximum outer diameter of the housing is consistent with the maximum outer diameter of the first superconducting cable and the second superconducting cable.

6. The superconducting cable assembly as described in claim 5, characterized in that, The first fastening layer, the second fastening layer, and the joint fastening layer are made of stainless steel with a thickness of 0.05mm-0.1mm. One end of the housing and the end of the first protective layer are configured with a matching bevel structure; The other end of the housing and the end of the second protective layer are configured with a matching bevel structure.

7. A method for preparing a superconducting cable assembly, characterized in that, The superconducting cable assembly is the superconducting cable assembly as described in any one of claims 1-6, and the preparation method includes: S1: Obtain the first superconducting cable and the second superconducting cable; S2: A portion of each first superconducting strip of the first superconducting cable passes through one end of the joint groove of the joint support and extends into the joint groove; a portion of each second superconducting strip of the second superconducting cable passes through the other end of the joint groove and extends into the joint groove. Each of the first superconducting strips and the corresponding second superconducting strips are stacked in the corresponding joint groove to form a stacked superconducting strip, and the plurality of first strips in the first superconducting strip and the plurality of second strips in the second superconducting strip are staggered and fixedly connected.

8. The method for preparing the superconducting cable assembly as described in claim 7, characterized in that, In step S2, the process of forming the stacked superconducting bands further includes: Apply solder paste with a thickness of 0.05mm-0.1mm evenly between each of the first strips and the adjacent second strips; A fixing strip is formed by spirally winding a metal wire or metal strip around the outer periphery of each of the stacked superconducting strips; The stacking location is heated, and the heating temperature is less than 140℃-170℃.

9. The method for preparing the superconducting cable assembly as described in claim 8, characterized in that, The preparation method further includes step S1', which is performed before step S2. Step S1' includes: One end of the connector support is connected to the end of the first support in the first superconducting cable, wherein the ends of the plurality of first grooves on the first support and one end of the plurality of connector grooves on the connector support are matched and connected one by one. The other end of the connector support is connected to the end of the second support in the second superconducting cable, wherein the ends of the plurality of second grooves on the second support and the other ends of the plurality of connector grooves on the connector support are matched and connected one by one. Heat the joint support to a temperature of 110℃-150℃, and solder the two joints together.

10. The method for preparing a superconducting cable assembly as described in any one of claims 7-9, characterized in that, The preparation method further includes: S3: Use a fastening layer material strip to wrap around the outer periphery of the joint support to form a joint fastening layer, and fix the two ends of the joint fastening layer to the end of the first fastening layer of the first superconducting cable and the end of the second fastening layer of the second superconducting cable, respectively. S4: Cover the outer periphery of the joint fastening layer with the two half-shells, fix the two half-shells after they are matched and connected, and apply a predetermined pressure until the outer diameter of the position where the two half-shells are set is consistent with the maximum outer diameter of the first superconducting cable; and connect one end of the two half-shells to the end of the first protective layer through a matching bevel structure, and connect the other end to the end of the second protective layer through a matching bevel structure; perform multiple welding on the docking part and the connection part of the two half-shells, with each welding time less than 25-40s, and keep the temperature of the shell below 140℃-160℃.

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